Etudes Compléments alimentaires : page 86.4

Glucosamine et chondroïtine réduisent certains cancers

27/01/2010 | Etudes Compléments alimentaires et Etudes Anti-âge

 

Associations of Herbal and Specialty Supplements with Lung and Colorectal Cancer Risk in the VITamins And Lifestyle Study
Jessie A. Satia,1,2,3,4 Alyson Littman,5,6 Christopher G. Slatore,7 Cancer Epidemiol Biomarkers Prev 2009;18(5):1419-28

Millions of Americans use dietary supplements with little knowledge about their benefits or risks. We examined associations of various herbal/specialty supplements with lung and colorectal cancer risk. Men and women, 50 to 76 years, in the VITamins And Lifestyle cohort completed a 24-page baseline questionnaire that captured duration (years) and frequency (days per week) of use of commonly used herbal/specialty supplements. Dose was not assessed due to the lack of accurate potency information. Supplement exposure was categorized as ‘‘no use’’ or ‘‘any use’’ over the previous 10 years. Hazard ratios (HR) were estimated by multivariate Cox regression models. Incident lung (n = 665) and colorectal cancers (n = 428) were obtained from the Surveillance, Epidemiology, and End Results cancer registry.

Any use of glucosamine and chondroitin, which have anti-inflammatory properties, over the previous 10 years, was associated with significantly lower lung cancer risk: HR 0.74 [95% confidence interval (95% CI), 0.58-0.94] and HR 0.72 (95% CI, 0.54-0.96) and colorectal cancer risk: HR 0.73 (95% CI, 0.54-0.98) and HR 0.65 (95% CI, 0.45-0.93),respectively.

There were also statistically significantly inverse associations of fish oil: HR 0.65 (95% CI, 0.42-0.99), methylsulfonylmethane: HR 0.46 (95% CI,
0.23-0.93), and St. John’s wort: HR 0.35 (95% CI, 0.14-0.85) with colorectal cancer risk. In contrast, garlic pills were associated with a statistically significant
35% elevated colorectal cancer risk. These results suggest that some herbal/specialty supplements may be associated with lung and colorectal cancer risk;
however, these products should be used with caution. Additional studies examining the effects of herbal/specialty supplements on risk for cancer and other
diseases are needed.

Contenu en anti-oxydants de 3100 aliments

23/01/2010 | Etudes Compléments alimentaires et Etudes Anti-âge

 

Additional file 1: The Antioxidant Food Table

Le Pycnogénol contre les hémorroïdes

21/01/2010 | Etudes Compléments alimentaires et Etudes Anti-âge

 

Pycnogenol® treatment of acute hemorrhoidal episodes
Gianni Belcaro, Maria Rosaria Cesarone
Phytotherapy Research Published Online: 29 Dec 2009

We investigated the efficacy of orally and topically applied Pycnogenol® for the management of acute hemorrhoidal attacks in a controlled, randomized study with 84 subjects. Within less than 48 h of onset of an acute attack, patients were enrolled and signs and symptoms were scored. This evaluation was repeated after seven days’ treatment and again seven days following treatment cessation. The decrease in scores was significantly more pronounced in the Pycnogenol®-treated groups than in the control group given placebo,showing the
efficacy of Pycnogenol® for relieving signs and symptoms of acute external hemorrhoids.
In a group of patients given topical (0.5%) Pycnogenol® in addition to oral Pycnogenol® the improvement in symptoms set in significantly faster and was more pronounced. The most prominent symptom, hemorrhoidal bleeding, was completely absent in all patients treated with Pycnogenol® for seven days and also at the 14 days follow-up. In contrast, bleedings were still observed in the control group during the two weeks follow-up. This study indicates that Pycnogenol®, both in oral and in topical form, is effective for controlling this common, disabling health problem. The application of Pycnogenol® eases the management of acute hemorrhoidal attacks and help avoid bleedings.

Curcuma contre les douleurs articulaires

20/01/2010 | Etudes Compléments alimentaires et Etudes Anti-âge

 

Efficacy and safety of Curcuma domestica extracts in patients with knee osteoarthritis,
Kuptniratsaikul V, Thamlikitkul V, et al, J Altern Complement Med, 2009; 15(8): 891-7.

In a randomized, controlled study involving 107 patients with primary knee osteoarthritis, results indicate that supplementation with Curcuma domestica (Turmeric) extract may be as efficacious and safe as ibuprofen in reducing pain and improving function. The patients were randomized to 800 mg/day ibuprofen (n=55) or 2 g/day Curcuma domestica extract (n=52), for a period of 6 weeks. Significant improvements in pain on level walking, pain on stairs, and functions of knee assessed by time spent during 100-m walk and going up and down a flight of stairs were observed in both groups with no significant difference. Additionally, there was no significant difference in adverse events between the ibuprofen and turmeric groups. Thus, the authors of this study conclude, “C. domestica extracts seem to be similarly efficacious and safe as ibuprofen for the treatment of knee OA.

Le problème n’est pas son efficacité mais son assimilation :

Biological actions of curcumin on articular chondrocytes
Y. Henrotin, A.L. Clutterbuck   Osteoarthritis and Cartilage Volume 18, Issue 2, Pages 141-149 (February 2010)

Objectives
Curcumin (diferuloylmethane) is the principal biochemical component of the spice turmeric and has been shown to possess potent anti-catabolic, anti-inflammatory and antioxidant, properties. This article aims to provide a summary of the actions of curcumin on articular chondrocytes from the available literature with the use of a text-mining tool. We highlight both the potential benefits and drawbacks of using this chemopreventive agent for treating osteoarthritis (OA). We also explore the recent literature on the molecular mechanisms of curcumin mediated alterations in gene expression mediated via activator protein 1 (AP-1)/nuclear factor-kappa B (NF-κB) signalling in chondrocytes, osteoblasts and synovial fibroblasts.

Methods
A computer-aided search of the PubMed/Medline database aided by a text-mining tool to interrogate the ResNet Mammalian database 6.0.

Results
Recent work has shown that curcumin protects human chondrocytes from the catabolic actions of interleukin-1 beta (IL-1β) including matrix metalloproteinase (MMP)-3 up-regulation, inhibition of collagen type II and down-regulation of β1-integrin expression. Curcumin blocks IL-1β-induced proteoglycan degradation, AP-1/NF-κB signalling, chondrocyte apoptosis and activation of caspase-3.

Conclusions
The available data from published in vitro and in vivo studies suggest that curcumin may be a beneficial complementary treatment for OA in humans and companion animals. Nevertheless, before initiating extensive clinical trials, more basic research is required to improve its solubility, absorption and bioavailability and gain additional information about its safety and efficacy in different species. Once these obstacles have been overcome, curcumin and structurally related biochemicals may become safer and more suitable nutraceutical alternatives to the non-steroidal anti-inflammatory drugs that are currently used for the treatment of OA.

Le ginseng rouge contre les rides

20/01/2010 | Etudes Compléments alimentaires et Etudes Anti-âge

 

Red ginseng root extract mixed with Torilus fructus and Corni fructus improves facial wrinkles and increases type I procollagen synthesis in human skin: a randomized, double-blind, placebo-controlled study

Cho S, Chung JH, et al, J Med Food, 2009; 12(6): 1252-9.

Summary: In a randomized, double-blind, placebo-controlled study involving 82 healthy female subjects, results indicate that long-term intake of red ginseng extract mixed with Torilus fructus and Corni fructus (herbal mixture) may improve facial wrinkles and increase collagen synthesis in skin. The women were randomized to 3 g/d red ginseng extract-containing herbal mixture or placebo for 24 weeks. At intervention end, significant improvements in facial wrinkles and wrinkle-related biochemical markers (type I procollagen gene and protein expression increased, MMP-9 gene induction was prevented, and fibrillin-1 fiber length was elongated) were observed. Thus, the authors of this study conclude, “A red ginseng extract-containing Torilus fructus and Corni fructus mixture improves facial wrinkles, a clinical sign of photoaging, and this improvement is associated with biochemical and histological evidence of increased collagen synthesis in the dermis. These results substantiate the alleged beneficial effects of red ginseng on photoaging and support its use as an effective “beauty food.”

Synergie oméga-3 et glucosamine

20/01/2010 | Etudes Compléments alimentaires et Etudes Anti-âge

 

Contre les douleurs articulaires.

Dosage quotidien : 3 capsules de 500 mg de glucosamine sulfate avec 200 mg d’oméga-3 (EPA + DHA).

Effect of Glucosamine Sulfate with or without Omega-3 Fatty Acids in Patients with Osteoarthritis

10 g d’acides aminés réduisent la production de myostatine

17/01/2010 | Etudes Compléments alimentaires

 
Essential Amino Acids Increase MicroRNA-499, -208b, and -23a and Downregulate Myostatin and Myocyte Enhancer Factor 2C mRNA Expression in Human Skeletal Muscle Micah J. Drummond, Erin L. Glynn, Christopher S. Fry, Shaheen Dhanani, Elena Volpi and Blake B. Rasmussen Journal of Nutrition,Vol. 139, No. 12, 2279-2284, December 2009 Essential amino acids (EAA) stimulate muscle protein synthesis in humans. However, little is known about whether microRNAs (miRNA) and genes associated with muscle growth are expressed differently following EAA ingestion. Our purpose in this experiment was to determine whether miRNA and growth-related mRNA expressed in skeletal muscle are up- or downregulated in humans following the ingestion of EAA. We hypothesized that EAA would alter miRNA expression in skeletal muscle as well as select growth-related genes. Muscle biopsies were obtained from the vastus lateralis of 7 young adult participants (3 male, 4 female) before and 3 h after ingesting 10 g of EAA. Muscle samples were analyzed for muscle miRNA (miR-499, -208b, -23a, -1, -133a, and -206) and muscle-growth related genes [MyoD1, myogenin, myostatin, myocyte enhancer factor C (MEF2C), follistatin-like-1 (FSTL1), histone deacytylase 4, and serum response factor mRNA] before and after EAA ingestion using real-time PCR. Following EAA ingestion, miR-499, -208b, -23a, -1, and pri-miR-206 expression increased (P < 0.05). The muscle-growth genes MyoD1 and FSTL1 mRNA expression increased (P < 0.05), and myostatin and MEF2C mRNA were downregulated following EAA ingestion (P < 0.05). We conclude that miRNA and growth-related genes expressed in skeletal muscle are rapidly altered within hours following EAA ingestion. Further work is needed to determine whether these miRNA are post-transcriptional regulators of growth-related genes following an anabolic stimulus.

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