Curcumin and your skin
Inflammation, aging, oxidative damage, cellulite
Curcumin, found in turmeric (curcuma longa), is one of the most widely researched natural actives known today, with potent anti-ageing, antioxidant, skin lightening, anti-inflammatory and lipolytic activity.
For all these reasons, curcumin is of great importance as an active ingredient in anti-ageing, anti-cellulite, leg wellness, contouring, skin whitening and under-eye creams [the Celluence® creams are the only cellulite creams in the world with high concentrations of 95%+ pure, high availability curcumin, plus 39x other natural anti-cellulite actives].
7+ ways Curcumin
can fight oxidative damage, inflammation, ageing and cellulite
7/ Novel curcumin - hyaluronic acid conjugate molecule improves curcumin's wound healing and antioxidant activity
Curcumin is a promising wound healing agent but its clinical application is limited due to being undiluted to water and lack of stability. However, curcumin conjugated to hyaluronic acid, has been found to be better than curcumin for fighting free radical damage and wound healing than plain curcumin.
[Source: Wound healing activity of curcumin conjugated to hyaluronic acid: in vitro and in vivo evaluation]
6/ Curcumin is a stronger and broader anti-inflammatory than the steroid drug prednisolone...
...allowing it to combat numerous inflammatory diseases via multiple pathways (TNF-α and IL-6 expression by macrophages, IL-8 expression by colon epithelial cells, ROS production in polymorphonuclear leukocytes and platelet activation in whole blood). Specifically, curcumin is as good inhibitor as prednisolone for TNF-alpha and IL-6 and better than prednisolone for ROS, IL-8 and fibrinogen binding.
[Source: Head-to-Head Comparison of Anti-Inflammatory Performance of Known Natural Products In Vitro]
5/ Curcumin significantly improves endothelial function...
...arterial compliance and arterial stiffness through its effects on inflammation, oxidative stress, nitric oxide bioavailability, and structural proteins of the artery
[Source: The Emerging Role of Curcumin for Improving Vascular Dysfunction: A Review]
4/ Curcumin helps burn fat by stimulating beige fat thermogenesis...
...by stimulating beta-3 adrenoreceptor gene expression and elevating the levels of plasma norepinephrine, albeit at quite high concentrations (50-100mg/kg of body weight). However, curcumin has been found in other studies to have a direct lipolytic and anti-adipogenic action, via additional mechanisms to thermogenesis. So the results of this experiment further add to the promise of curcumin as an anti-obesity and anti-cellulite natural chemical.
[Source: Curcumin promotes browning of white adipose tissue in a norepinephrine-dependent way]
3/ Curcumin protects fat cells from hypoxia-induced inflammation and insulin resistance...
...via reducing inflammatory adipokine NF-kB and boosting adiponectin secretion. The researchers noted that hypoxia effects huge increases in basal adipocyte glucose uptake (3.3x), leptin (3x), resisting (6.8x) and TLR-4 (8.8x) and reduces adiponectin by reduced adiponectin by 66%.
[Source: Development of insulin resistance through sprouting of inflammatory markers during hypoxia in 3T3-L1 adipocytes and amelioration with curcumin]
2/ Curcumin PREVENTS MITOCHONDRIAl-dysfunction RELATED disease by...
...protecting mitochondria from oxidation; helping regulate mitochondrial metabolism; modulating cell death due to mitochondrial dysfunction
[Source: Dietary Polyphenols and Mitochondrial Function: Role in Health and Disease]
1/ Curcumin blocks the growth of new fat cells [in-vivo study]
This new study shows that curcumin represses the differentiation of adipocytes by inhibiting the protein miR-17-5p and by stimulating the Wnt signalling pathway, which is known to inhibit adipocyte growth. This is in addition to multiple other studies which show the anti-adipogenic and/or lipolytic potential of curcumin
[Source: Curcumin represses mouse 3T3-L1 cell adipogenic differentiation via inhibiting miR-17-5p and stimulating the Wnt signalling pathway effector Tcf7l2]
curcumin protects fat cells from inflammation, helps fight cellulite
- Dietary phytochemicals called polyphenols are known potent antioxidants that protect body tissues from free radical damage and consequent inflammation.
- Inflammation and oxidative damage are key components of cellulite, as well as diabetes and several other so-called civilisation diseases, such as heart disease and arthritis.
- Recent research has now looked into 28 polyphenols (such as hesperidin, resveratrol, epigallocatechin gallate and curcumin) and concluded that those polyphenols protect fat cells from both oxidative damage and inflammation, by reducing inflammatory hormones, such as IL-6.
- This practically means that orally taken polyphenols (either as foods or as supplements) can be used in the fight against fat tissue inflammation for the prevention of diabetes and cellulite.
- Polyphenols may also be used with local application in the fight against cellulite as active ingredients in an anti-cellulite cream. Naturally, the more of those polyphenols are present in the cream the better results are to be expected, due to a synergistic effect of using multiple ingredients.
- Source: Evaluation of antioxidant properties of major dietary polyphenols and their protective effect on 3T3-L1 preadipocytes and red blood cells exposed to oxidative stress
- Abstract: "Obesity has been associated with a marked risk of metabolic diseases and requires therapeutic strategies. Changes in redox status with increased oxidative stress in adipose tissue have been linked with obesity-related disorders. Thus, the biological effect of antioxidants such as polyphenols is of high interest. We aimed to measure antioxidant capacities of 28 polyphenols representative of main dietary phenolic acids, flavonoids, stilbenes and curcuminoids. Then, 14 molecules were selected for the evaluation of their effect on 3T3-L1 preadipocytes and human red blood cells exposed to oxidative stress. Analysis of reducing and free radical-scavenging capacities of compounds revealed antioxidant properties related to their structure, with higher activities for flavonoids such as quercetin and epicatechin. Their effects on preadipocytes' viability also depended on their structure, dose and time of exposure. Interestingly, most of the compounds exhibited a protective effect on preadipocytes exposed to oxidative stress, by reversing H₂O₂-induced anti-proliferative action and reactive oxygen species production. Polyphenols also exerted an anti-inflammatory effect on preadipocytes exposed to H₂O₂ by reducing IL-6 secretion. Importantly, such antioxidant and anti-inflammatory effects were observed in co-exposition (polyphenol and prooxidant during 24 h) or pretreatment (polyphenol during 24 h, then prooxidant for 24 h) conditions. Moreover, compounds protected erythrocytes from AAPH radical-induced lysis. Finally, these results led to demonstrate that antioxidant and anti-inflammatory properties of polyphenols may depend on structure, dose, time of exposure and cell conditioning with oxidative stress. Such findings should be considered for a better understanding of polyphenols' benefits in strategies aiming to prevent obesity-related diseases."
- Interleukin-6 (IL-6) is one of the most important pro-inflammatory protein the body
- Curcumin, the active ingredient in the Indian spice turmeric, is a well-known anti-inflammatory natural molecule
- A new paper published this month examined the anti-inflammatory action of curcumin and concluded that there are numerous studies demonstrating that the anti-inflammatory action of curcumin is due to blocking the action of IL-6
- Curcumin is taken as a supplement and also as an active ingredient in advanced skincare creams
- Source: Curcumin: An effective inhibitor of interleukin-6.
- Abstract: Curcumin is apolyphenolic compound found in the dietary spice turmeric. Anti-inflammatory effects of turmeric have been known for centuries and extensive studies over the last two to three decades revealed that curcumin is a key component in the anti-inflammatory effects of turmeric. Chronic inflammation is involved in the various pathologic states and curcumin demonstrated therapeutic effects in different inflammation-related diseases in various in vivo, in vitro and human based studies through regulation of different signaling molecules including transcription factors, chemokines, cytokines, tumor suppressor genes, adhesion molecules and microRNAs. Interleukin-6 (IL-6) plays important roles in various events during inflammation including regulation of antibody (and autoantibody) production, activation of T cells, differentiation of B cells, increased production of acute-phase proteins, hematopoiesis and angiogenesis, vascular permeability, and osteoclast differentiation. IL-6 is also involved in pathogenesis of different inflammatory diseases. There are numerous studies demonstrating association of down-regulation of IL-6 and/or inhibition of IL-6 signaling with therapeutic effects of curcumin suggesting a role for modulation of IL-6 in anti-inflammatory effects of curcumin. Moreover, curcumin can be considered as potential therapy against IL-6 involved pathologic stats. In this narrative review, the in vitro, experimental and clinical studies that report association of IL-6 inhibition and therapeutic effects of curcumin are discussed.
- Dietary polyphenols are beneficial plant chemicals found in fruit, herbs and vegetables, which are known primarily from their antioxidant action
- Most importantly, however, different polyphenols also exert anti-inflammatory, anti-cancer, metabolic and anti-obesity action on the human body
- In fact, scientists now know that it is not the antioxidant action that is important in polyphenols but the action on inflammation and metabolism
- EGCG (from green tea), resveratrol (found in berries), quercetin (found in onions), curcumin (from turmeric), catechins (in cocoa), epicatechins (in pine bark and grape seeds), proanthocyanidins (e.g. in cranberries), and myricetin (found in fruit) are some of the most "famous" polyphenols
- A review published in 2014 reports that thousands of cell, tissue, animal and human studies in the last few years have shown the beneficial effects of polyphenols on health, and specifically in metabolic disorders and obesity
- Cell studies show that dietary polyphenols fight fat in multiple ways. They:
- Reduce the life span of adipocytes (fat cells)
- Reduce fat cell growth
- Inhibit the capacity of fat cells to accumulate fat
- Reduce fat cell proliferation
- Stimulate lipolysis (fat breakdown and release from fat cells)
- Boost energy expenditure / fat oxidation ("fat burning") outside fat cells
- Stimulate thermogenesis (fat burning inside fat cells)
- Inhibit adipose tissue inflammation within and outside adipose tissue
- Fight oxidative damage within and outside fat tissue
- Fight metabolic dysfunction within and outside adipose tissue
- Reduce high glucose levels, triglycerides, cholesterol and glycation
- "Animal studies strongly suggest that commonly consumed polyphenols have a pronounced effect on obesity as shown by lower body weight, fat mass and triglycerides through enhancing energy expenditure and fat utilization, and modulating glucose homeostasis"
- "On the other hand, human studies are more limited and are more inconsistent about the anti-obesity impact of dietary polyphenols probably due to the various study designs and lengths, variation among subjects (age, gender, ethnicity), chemical forms of the dietary polyphenols used and confounding factors such as other weight-reducing agents", the study authors state
- However, our experience of reviewing such studies in the last decade shows that polyphenols are more effective on cell cultures, tissues and animals are more effective simply because of the much higher dosage than used on humans, which is quite often one or two orders of magnitude greater
- Nevertheless, the general trend with the use of polyphenols in human trials is towards a healthier metabolic profile and reduced fat accumulation, obesity and it's complications, even with normal, dietary intakes or with reasonably increased intakes in the form of supplements etc.
- However, polyphenols could be much more beneficial at local level, i.e. for spot fat / cellulite reduction than it is for whole body level. This is because whole body weight loss depends too much on food intake and exercise and because very high intake of polyphenols at whole body level is practically impossible and possibly unhealthy
- Clearly, high-concentration topical application, similar to that seen in cell, tissue and animal studies makes much more sense, and is a trend seen in quality cosmeceuticals recently, including anti-ageing and cellulite creams
- In all cases, more "randomised controlled trials are warranted to reconcile the discrepancies between preclinical efficacies and inconclusive clinic outcomes of these polyphenols", as the study authors report.
- Source: Novel insights of dietary polyphenols and obesity.
- Abstract: The prevalence of obesity has steadily increased over the past three decades both in the United States and worldwide. Recent studies have shown the role of dietary polyphenols in the prevention of obesity and obesity-related chronic diseases. Here, we evaluated the impact of commonly consumed polyphenols, including green tea catechins, especially epigallocatechin gallates, resveratrol and curcumin, on obesity and obesity-related inflammation. Cellular studies demonstrated that these dietary polyphenols reduce viability of adipocytes and proliferation of preadipocytes, suppress adipocyte differentiation and triglyceride accumulation, stimulate lipolysis and fatty acid β-oxidation, and reduce inflammation. Concomitantly, the polyphenols modulate signaling pathways including the adenosine-monophosphate-activated protein kinase, peroxisome proliferator activated receptor γ, CCAAT/enhancer binding protein α, peroxisome proliferator activator receptor gamma activator 1-alpha, sirtuin 1, sterol regulatory element binding protein-1c, uncoupling proteins 1 and 2, and nuclear factor-κB that regulate adipogenesis, antioxidant and anti-inflammatory responses. Animal studies strongly suggest that commonly consumed polyphenols described in this review have a pronounced effect on obesity as shown by lower body weight, fat mass and triglycerides through enhancing energy expenditure and fat utilization, and modulating glucose hemostasis. Limited human studies have been conducted in this area and are inconsistent about the antiobesity impact of dietary polyphenols probably due to the various study designs and lengths, variation among subjects (age, gender, ethnicity), chemical forms of the dietary polyphenols used and confounding factors such as other weight-reducing agents. Future randomized controlled trials are warranted to reconcile the discrepancies between preclinical efficacies and inconclusive clinic outcomes of these polyphenols.
- In a study published today it was found that the turmeric extract curcumin reduces fat pad weights, including deep abdominal fat
- Leptin, a hormone whose increased secretion leads to a host of metabolic problems, was decreased with curcumin, while fat cell hormones involved in lipolysis (fat release from fat cells) ATGL and HSL were increased
- This paper adds to the already extensive body of evidence about curcumin's anti-obesity and metabolic regulating benefits
- Curcumin is clearly an ideal anti-inflammatory, anti-ageing, lipolytic and anti-cellulite cream active
- Source: Korean Curcuma longa L. induces lipolysis and regulates leptin in adipocyte cells and rats.
- Abstract: BACKGROUND/OBJECTIVES: Turmeric (Curcuma longa L.) has been reported to have many biological functions including anti-obesity. Leptin, peptide hormone produced by adipocytes and its concentration is increased in proportion to the amount of the adipocytes. In the present study, we examined the effects of Korean turmeric on the regulation of adiposity and leptin levels in 3T3-L1 adipocytes and rats fed a high-fat and high-cholesterol diet. MATERIALS/METHODS: Leptin secretion, free fatty acid and glycerol contents in 3T3-L1 adipocytes were measured after incubation of cells with turmeric for 24 hours. Rats were divided into four experimental groups: a normal diet group (N), a high-fat and high-cholesterol diet group (HF), a high-fat and high-cholesterol diet group supplemented with 2.5% turmeric extracts (TPA group) and a high-fat and high-cholesterol diet group supplemented with 5% turmeric extracts (TPB group). Serum samples were used for the measurement of leptin concentration. RESULTS: Contents of free fatty acid and glycerol showed concentration dependent increase in response to turmeric extracts. Effects of turmeric extracts on reduction of lipid accumulation in 3T3-L1 cells were examined by Oil Red O staining. Treatment with turmeric extracts resulted in increased expression levels of adipose triglyceride lipase and hormone-sensitive lipase mRNA. The concentration of leptin from 3T3-L1 adipocytes was significantly decreased by turmeric. Proportional abdominal and epididymal fats weights of the turmeric 5% supplemented group, TPB has significantly decreased compared to the HF group. The serum levels of leptin in the TPA and TPB groups were significantly lower than those of the HF group. CONCLUSIONS: Based on these results, we suggested that Korean turmeric may contribute to the decreasing of body fat and regulating leptin secretion.
- Resveratrol, found in grapes, berries and red wine) and curcumin (found in turmeric) are proven anti-inflammatory, antioxidant and anti-ageing natural molecules, but heir absorption and instability limit their clinical use.
- Liposomal and other enhanced absorption and stability forms are already sued in supplements and cosmetics with the combination of the two natural chemicals providing synergistic results.
- Now scientists have created hybrids of curcumin and resveratrol which possess increased anti-inflammatory activity and proved their efficacy on acute lung injury, hoping that these compounds can lead to the development of new drugs against inflammatory conditions.
- In the meantime, the stabilised forms of high purity resveratrol and curcumin already provide valuable anti-ageing, anti-inflammatory and antioxidant benefits in a group of select skin care products, if used in high concentrations.
- Source: Development of resveratrol-curcumin hybrids as potential therapeutic agents for inflammatory lung diseases.
- Abstract: Acute lung injury (ALI) is a major cause of acute respiratory failure in critically-ill patients. Resveratrol and curcumin are proven to have potent anti-inflammatory efficacy, but their clinical application is limited by their metabolic instability. Here, a series of resveratrol and the Mono-carbonyl analogs of curcumin (MCAs) hybrids were designed and synthesized by efficient aldol construction strategy, and then screened for anti-inflammatory activities in vitro and in vivo. The results showed that the majority of analogs effectively inhibited the LPS-induced production of IL-6 and TNF-α. Five analogs, a9, a18, a19, a20 and a24 exhibited excellent anti-inflammatory activity in a dose-dependent manner along with low toxicity in vitro. Structure activity relationship study revealed that the electron-withdrawing groups at meta-position and methoxyl group (OCH3) at the para position of the phenyl ring were important for anti-inflammatory activities. The most promising compound a18 decreased LPS induced TNF-α, IL-6, IL-12, and IL-33 mRNA expression. Additionally, a18 significantly protected against LPS-induced acute lung injury in the in vivo mouse model. The research of resveratrol and MCAs hybrids could bring insight into the treatment of inflammatory diseases and compound a18 may serve as a lead compound for the development of anti-ALI agents.
Turmeric contains approximately 2% curcumin, so a teaspoon of turmeric contains about 50mg curcumin. Most researchers recommend an average of 1000mg of curcumin/day...
- In a new study published today it was shown that curcuminoids, the curcumin derivatives contained in the turmeric plant, combined with piperine, a pepper extract, reduce inflammatory markers in the blood in people who suffer from metabolic syndrome (pre-diabetes)
- Specifically, the curcuminoid/piperine combination reduced levels of malondialdehyde (MDA), a marker of fat oxidation; increased the activity of the body's own natural antioxidant enzyme superoxide dismutase (SOD); and significantly reduced levels of the inflammatory protein C-reactive protein (CRP), which is a very important risk marker and risk factor of cardiovascular disease (people with metabolic syndrome have a very high risk of cardiovascular heart disease).
- This randomised, placebo controlled clinical trial on humans shows that even "short-term supplementation with a curcuminoid-piperine combination significantly improves oxidative and inflammatory status in patients with metabolic syndrome" and that "curcuminoids could be regarded as natural, safe and effective CRP-lowering agents."
- Curcumin is already widely researched, and widely used, for it's antioxidant, anti-inflammatory and anti-cancer action, so the results of this study are hardly surprising and confirm what was shown in other studies, but in a clinical, randomised, placebo-controlled setup.
- It is important to note here that curcuminoids are the sole active agents that accomplish the beneficial effects in inflammation/oxidation status, with the piperine acting as an absorption enhancer.
- However, piperine is not absolutely necessary, as it enhances absorption only by a small factor, in contract to curcumin in liposome form, which is much more bioavailable, so our suggestion would be to use liposomal curcumin for maximum results.
- Source: Antioxidant and anti-inflammatory effects of curcuminoid-piperine combination in subjects with metabolic syndrome: A randomised controlled trial and an updated meta-analysis.
- The same antioxidant and anti-inflammatory action of curcumin that helps with prevention of cardiovascular disease is also beneficial in anti-ageing and cellulite creams, if curcumin is included in a high-purity, high-concentration form.
- Abstract: BACKGROUND: Oxidative stress and inflammation have been proposed as emerging components of metabolic syndrome (MetS). Curcuminoids are natural polyphenols with strong antioxidant and anti-inflammatory properties. OBJECTIVE: To study the effectiveness of supplementation with a bioavailable curcuminoid preparation on measures of oxidative stress and inflammation in patients with MetS. Our secondary aim was to perform a meta-analysis of data from all randomized controlled trials in order to estimate the effect size of curcuminoids on plasma C-reactive protein (CRP) concentrations. METHODS: In this randomized double-blind placebo-controlled trial, 117 subjects with MetS (according to the NCEP-ATPIII diagnostic criteria) were randomly assigned to curcuminoids (n = 59; drop-outs = 9) or placebo (n = 58; drop-outs = 8) for eight weeks. Curcuminoids were administered at a daily dose of 1 g, and were co-supplemented with piperine (10 mg/day) in order to boost oral bioavailability. Serum activities of superoxide dismutase (SOD) and concentrations of malondialdehyde (MDA) and CRP were measured at baseline and at study end. Regarding the importance of CRP as a risk marker and risk factor of cardiovascular disease, a random-effects meta-analysis of clinical trials was performed to estimate the overall impact of curcuminoid therapy on circulating concentrations of CRP. The robustness of estimated effect size was evaluated using leave-one-out sensitivity analysis. RESULTS: Supplementation with curcuminoid-piperine combination significantly improved serum SOD activities (p < 0.001) and reduced MDA (p < 0.001) and CRP (p < 0.001) concentrations compared with placebo. Quantitative data synthesis revealed a significant effect of curcuminoids vs. placebo in reducing circulating CRP concentrations (weighed mean difference: -2.20 mg/L; 95% confidence interval [CI]: -3.96, -0.44; p = 0.01). This effect was robust in sensitivity analysis. CONCLUSIONS: Short-term supplementation with curcuminoid-piperine combination significantly improves oxidative and inflammatory status in patients with MetS. Curcuminoids could be regarded as natural, safe and effective CRP-lowering agents.
- Comment: A new meta-analysis study has found that turmeric is as effective as medication in reduction of pain score in arthritis
- The meta analysis authors stated that the quality of the studies was generally good but more studies of larger sample sizes needs to be conducted for clearer evidence
- In the meantime, sufferers can take 1000mg/day of curcumin, a safe, and economical anti-inflammatory, anti-cancer, antioxidant supplement, while waiting for a few of decades for new studies too emerge...
- (Here it is important to note that turmeric has been used for millennia as a relief for inflammation and curcumin has been investigated for it's anti-inflammatory role in almost all human organs and tissues, from skin to bowel to brain)
- Source: Efficacy of Turmeric Extracts and Curcumin for Alleviating the Symptoms of Joint Arthritis: A Systematic Review and Meta-Analysis of Randomized Clinical Trials.
- Abstract: Although turmeric and its curcumin-enriched extracts have been used for treating arthritis, no systematic review and meta-analysis of randomized clinical trials (RCTs) have been conducted to evaluate the strength of the research. We systemically evaluated all RCTs of turmeric extracts and curcumin for treating arthritis symptoms to elucidate the efficacy of curcuma for alleviating the symptoms of arthritis. Literature searches were conducted using 12 electronic databases, including PubMed, Embase, Cochrane Library, Korean databases, Chinese medical databases, and Indian scientific database. Search terms used were "turmeric," "curcuma," "curcumin," "arthritis," and "osteoarthritis." A pain visual analogue score (PVAS) and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) were used for the major outcomes of arthritis. Initial searches yielded 29 articles, of which 8 met specific selection criteria. Three among the included RCTs reported reduction of PVAS (mean difference: -2.04 [-2.85, -1.24]) with turmeric/curcumin in comparison with placebo (P < .00001), whereas meta-analysis of four studies showed a decrease of WOMAC with turmeric/curcumin treatment (mean difference: -15.36 [-26.9, -3.77]; P = .009). Furthermore, there was no significant mean difference in PVAS between turmeric/curcumin and pain medicine in meta-analysis of five studies. Eight RCTs included in the review exhibited low to moderate risk of bias. There was no publication bias in the meta-analysis. In conclusion, these RCTs provide scientific evidence that supports the efficacy of turmeric extract (about 1000 mg/day of curcumin) in the treatment of arthritis. However, the total number of RCTs included in the analysis, the total sample size, and the methodological quality of the primary studies were not sufficient to draw definitive conclusions. Thus, more rigorous and larger studies are needed to confirm the therapeutic efficacy of turmeric for arthritis.
- Comment: The turmeric active curcumin stimulates skin cells' antioxidant, detoxification and DNA repair systems to protect against UV-B skin damage
- Source: Protective Effect of Curcumin Against Acute Ultraviolet B Irradiation Induced Photo-damage.
- Abstract: Ultraviolet B (UVB) irradiation is one of the most dangerous insults for skin, and causes sunburn, erythema, photoaging and photocarcinogenesis. Curcumin (diferuloylmethane), a yellow spice derived from dried rhizomes of Curcuma longa, has been shown to possess significant anti-inflammatory, anti-oxidant, anti-carcinogenic, anti-mutagenic, anticoagulant and anti-infective effects. However, the protective effects of curcumin against acute photo-damage are poorly understood. In this study, we investigated the photo-protective effects of curcumin against UVB induced acute photo-damage in hairless mice and immortalized human keratinocytes (HaCaT). Topical application of curcumin significantly inhibited acute UVB (540 mJ/cm(2) , for 3 successive days)-induced inflammatory cells, collagen accrementition derangement and lipid peroxidation, and effectively induced NF-E2-related factor 2 (Nrf2) nuclear accumulation in Uncovered (Uncv) hairless mice skin. Treatment of HaCaT cells with curcumin significantly attenuated acute UVB (300 mJ/cm(2) )-induced lactate dehydrogenase (LDH) release, intracellular reactive oxygen species (ROS) production and DNA damage, activated the expression of the phase II detoxifying enzymes and promoted DNA repair activity. The photoprotective effect provided by curcumin was potential associated with modulation of Nrf2-dependent antioxidant response. Our study suggested that curcumin is a potential agent for preventing and/or treating UV radiation induced acute inflammation and photoaging.
- Source: Wound Healing Effect of Curcumin: A Review.
- Abstract: Wound healing is a complex process that consists of several phases that range from coagulation, inflammation, accumulation of radical substances, to proliferation, formation of fibrous tissues and collagen, contraction of wound with formation of granulation tissue and scar. Since antiquity, vegetable substances have been used as phytotherapeutic agents for wound healing, and more recently natural substances of vegetable origin have been studied with the attempt to show their beneficial effect on wound treatment. Curcumin, the most active component of rhizome of Curcuma longa L. (common name: turmeric), has been studied for many years due to its bio-functional properties, especially antioxidant, radical scavenger, antimicrobial and anti-inflammatory activities, which play a crucial role in the wound healing process. Moreover, curcumin stimulated the production of the growth factors involved in the wound healing process, and so curcumin also accelerated the management of wound restoration. The aim of the present review is collecting and evaluating the literature data regarding curcumin properties potentially relevant for wound healing. Moreover, the investigations on the wound healing effects of curcumin are reported. In order to produce a more complete picture, the chemistry and sources of curcumin are also discussed.
- Curcuma longa extract associated with white pepper lessens high fat diet-induced inflammation in subcutaneous adipose tissue.
- Abstract: BACKGROUND: Supra-nutritional doses of curcumin, derived from the spice Curcuma longa, have been proposed as a potential treatment of inflammation and metabolic disorders related to obesity. The aim of the present study was to test whether Curcuma longa extract rich in curcumin and associated with white pepper (Curcuma-P®), at doses compatible with human use, could modulate systemic inflammation in diet-induced obese mice. We questioned the potential relevance of changes in adiposity and gut microbiota in the effect of Curcuma-P® in obesity. METHODOLOGY/PRINCIPAL FINDINGS: Mice were fed either a control diet (CT), a high fat (HF) diet or a HF diet containing Curcuma longa extract (0.1 % of curcumin in the HF diet) associated with white pepper (0.01 %) for four weeks. Curcumin has been usually combined with white pepper, which contain piperine, in order to improve its bioavailability. This combination did not significantly modify body weight gain, glycemia, insulinemia, serum lipids and intestinal inflammatory markers. Tetrahydrocurcumin, but not curcumin accumulated in the subcutaneous adipose tissue. Importantly, the co-supplementation in curcuma extract and white pepper decreased HF-induced pro-inflammatory cytokines expression in the subcutaneous adipose tissue, an effect independent of adiposity, immune cells recruitment, angiogenesis, or modulation of gut bacteria controlling inflammation. CONCLUSIONS/SIGNIFICANCE: These findings support that nutritional doses of Curcuma longa, associated with white pepper, is able to decrease inflammatory cytokines expression in the adipose tissue and this effect could be rather linked to a direct effect of bioactive metabolites reaching the adipose tissue, than from changes in the gut microbiota composition.
- Source: Curcumin, demethoxycurcumin, bisdemethoxycurcumin, tetrahydrocurcumin and turmerones differentially regulate anti-inflammatory and anti-proliferative responses through a ROS-independent mechanism.
- Abstract: Curcumin, a component of turmeric (Curcuma longa), has been shown to exhibit chemopreventive activity. Whether analogs of curcumin (Cur), such as demethoxycurcumin (DMC), bisdemethoxycurcumin (BDMC), tetrahydrocurcumin (THC) and turmerones, modulate inflammatory signaling and cell proliferation signaling to same extent as curcumin was investigated. The results indicate that the relative potency for suppression of tumor necrosis factor (TNF)-induced nuclear factor-kappaB (NF-kappaB) activation was Cur > DMC > BDMC; thus suggesting the critical role of methoxy groups on the phenyl ring. THC, which lacks the conjugated bonds in the central seven-carbon chain, was completely inactive for suppression of the transcription factor. Turmerones also failed to inhibit TNF-induced NF-kappaB activation. The suppression of NF-kappaB activity correlated with inhibition of NF-kappaB reporter activity and with down-regulation of cyclooxygenase-2, cyclin D1 and vascular endothelial growth factor, all regulated by NF-kappaB. In contrast to NF-kappaB activity, the suppression of proliferation of various tumor cell lines by Cur, DMC and BDMC was found to be comparable; indicating the methoxy groups play minimum role in the growth-modulatory effects of curcumin. THC and turmerones were also found to be active in suppression of cell growth but to a much lesser extent than curcumin, DMC and BDMC. Whether suppression of NF-kappaB or cell proliferation, no relationship of any of the curcuminoid was found with reactive oxygen species (ROS) production. Overall, our results demonstrated that different analogs of curcumin present in turmeric exhibit variable anti-inflammatory and anti-proliferative activities, which do not correlate with their ability to modulate the ROS status.
- Source: Phytochemicals in regulating fatty acid β-oxidation: Potential underlying mechanisms and their involvement in obesity and weight loss.
- Abstract: Excessive accumulation of fat as the result of more energy intake and less energy expenditure is known as obesity. Lipids are essential components in the human body and are vital for maintaining homeostasis and physiological as well as cellular metabolism. Fatty acid synthesis and catabolism (by fatty acid oxidation) are normal part of basic fuel metabolism in animals. Fatty acids are degraded in the mitochondria by a biochemical process called β-oxidation in which two-carbon fragments are produced in each cycle. The increase in fatty acid oxidation is positively correlated with body mass index. Although healthy life style, avoiding Western diet, dieting and strenuous exercise are the commonly used methods to lose weight, they are not considered a permanent solution in addition to risk attenuation of in basal metabolic rate (BMR). Pharmacotherapy offers benefits of weight loss by altering the satiety and lowering absorption of fat from the food; however, its side effects may outweigh the benefits of weight loss. Alternatively, dietary phytochemicals and natural health products offer great potential as an efficient weight loss strategy by modulating lipid metabolism and/or increasing BMR and thermogenesis. Specifically, polyphenols such as citrus flavonoids, green tea epigallocatechin gallate, resveratrol, capsaicin and curcumin, have been reported to increase lipolysis and induce fatty acid β-oxidation through modulation of hormone sensitive lipase, acetyl-coA carboxylase, carnitine acyl transferase and peroxisome proliferator-activated receptor gamma coactivator-1. In this review article, we discuss selected phytochemicals in relation to their integrated functionalities and specific mechanisms for weight loss.
- Curcumin, the anti-inflammatory, anti-ageing and anti-cancer compound from turmeric, is well-known for it's anti-adipogenic / slimming activity and thereby it's usefulness in anti-cellulite creams
- Turmeric acts via various pathways to inhibit growth of fat cells and in a recent study yet one more fat accumulation inhibiting pathway has been discovered: turmeric inhibits glucose absorption by intestinal cells, by blocking the protein GLUT1
- This leads to blood sugar reduction and fat reduction and is in addition to turmeric's inhibiting effect on GLUT4, which blocks glucose absorption by fat cells
- The researchers state that due to the blockage of GLIT1 turmeric may also compromise cancer cells that depend on GLUT1 for glucose absorption
- Source: Curcumin directly inhibits the transport activity of GLUT1.
- Abstract: Curcumin, a major ingredient in turmeric, has a long history of medicinal applications in a wide array of maladies including treatment for diabetes and cancer. Seemingly counterintuitive to the documented hypoglycemic effects of curcumin, however, a recent report indicates that curcumin directly inhibits glucose uptake in adipocytes. The major glucose transporter in adipocytes is GLUT4. Therefore, this study investigates the effects of curcumin in cell lines where the major transporter is GLUT1. We report that curcumin has an immediate inhibitory effect on basal glucose uptake in L929 fibroblast cells with a maximum inhibition of 80% achieved at 75 μM curcumin. Curcumin also blocks activation of glucose uptake by azide, glucose deprivation, hydroxylamine, or phenylarsine oxide. Inhibition does not increase with exposure time and the inhibitory effects reverse within an hour. Inhibition does not appear to involve a reaction between curcumin and the thiol side chain of a cysteine residue since neither prior treatment of cells with iodoacetamide nor curcumin with cysteine alters curcumin's inhibitory effects. Curcumin is a mixed inhibitor reducing the Vmax of 2DG transport by about half with little effect on the Km. The inhibitory effects of curcumin are not additive to the effects of cytochalasin B and 75 μM curcumin actually reduces specific cytochalasin B binding by 80%. Taken together, the data suggest that curcumin binds directly to GLUT1 at a site that overlaps with the cytochalasin B binding site and thereby inhibits glucose transport. A direct inhibition of GLUT proteins in intestinal epithelial cells would likely reduce absorption of dietary glucose and contribute to a hypoglycemic effect of curcumin. Also, inhibition of GLUT1 activity might compromise cancer cells that overexpress GLUT1 and be another possible mechanism for the documented anticancer effects of curcumin.