Tags

Type your tag names separated by a space and hit enter

Chromium supplementation enhances insulin signalling in skeletal muscle of obese KK/HlJ diabetic mice.
Diabetes Obes Metab 2009; 11(4):293-303DO

Abstract

AIM

Chromium is an essential nutrient required for glucose and lipid metabolism. Laboratory and clinical evidences indicate that chromium supplementation may improve insulin sensitivity by enhancing intracellular signalling. Considerable evidence suggests that serine phosphorylation of insulin receptor substrate 1 (IRS1) at 307 residue (IRS1-Ser307) inhibits insulin signalling and results in peripheral insulin resistance. Therefore, we investigated whether chromium-associated insulin action was mediated by modulation of IRS1-Ser307 phosphorylation.

METHODS

Male KK/HlJ mice (genetically obese and insulin resistant) were supplemented daily with chromium-containing milk powder or placebo for 7 weeks. In analysing functionally characterized insulin resistance, the changes of blood biochemicals, inflammatory factors and insulin signalling molecules in skeletal muscle were analysed.

RESULTS

Using KK mice model, we demonstrated that daily supplementation of trivalent chromium-containing milk powder reduced serum levels of glucose, insulin and triglycerides, and improved glucose and insulin tolerance. Mechanistic study showed that chromium supplementation activated postreceptor insulin signalling such as increasing IRS1, IRS1 tyrosine phosphorylation, p85alpha regulatory subunit of phosphatidylinositol 3-kinase and glucose transporter 4 expression, stimulating Akt activity, downregulating c-Jun N-terminal kinase (JNK) activity and decreasing IRS1 ubiquitinization and insulin resistance-associated IRS1 phosphorylation (IRS1-Ser307) in skeletal muscle. In addition, chromium supplementation attenuated pro-inflammatory cytokine expression in both blood circulation and skeletal muscle.

CONCLUSION

Our data suggest that chromium-containing milk powder supplementation can provide a beneficial effect in diabetic subjects by enhancing insulin signalling in skeletal muscle. The improvement in insulin signalling by chromium was associated with the decreased IRS1-Ser307 phosphorylation, JNK activity and pro-inflammatory cytokine production.

Authors+Show Affiliations

Department of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18721257

Citation

Chen, W-Y, et al. "Chromium Supplementation Enhances Insulin Signalling in Skeletal Muscle of Obese KK/HlJ Diabetic Mice." Diabetes, Obesity & Metabolism, vol. 11, no. 4, 2009, pp. 293-303.
Chen WY, Chen CJ, Liu CH, et al. Chromium supplementation enhances insulin signalling in skeletal muscle of obese KK/HlJ diabetic mice. Diabetes Obes Metab. 2009;11(4):293-303.
Chen, W. Y., Chen, C. J., Liu, C. H., & Mao, F. C. (2009). Chromium supplementation enhances insulin signalling in skeletal muscle of obese KK/HlJ diabetic mice. Diabetes, Obesity & Metabolism, 11(4), pp. 293-303. doi:10.1111/j.1463-1326.2008.00936.x.
Chen WY, et al. Chromium Supplementation Enhances Insulin Signalling in Skeletal Muscle of Obese KK/HlJ Diabetic Mice. Diabetes Obes Metab. 2009;11(4):293-303. PubMed PMID: 18721257.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Chromium supplementation enhances insulin signalling in skeletal muscle of obese KK/HlJ diabetic mice. AU - Chen,W-Y, AU - Chen,C-J, AU - Liu,C-H, AU - Mao,F C, Y1 - 2008/08/20/ PY - 2008/8/30/pubmed PY - 2010/1/23/medline PY - 2008/8/30/entrez SP - 293 EP - 303 JF - Diabetes, obesity & metabolism JO - Diabetes Obes Metab VL - 11 IS - 4 N2 - AIM: Chromium is an essential nutrient required for glucose and lipid metabolism. Laboratory and clinical evidences indicate that chromium supplementation may improve insulin sensitivity by enhancing intracellular signalling. Considerable evidence suggests that serine phosphorylation of insulin receptor substrate 1 (IRS1) at 307 residue (IRS1-Ser307) inhibits insulin signalling and results in peripheral insulin resistance. Therefore, we investigated whether chromium-associated insulin action was mediated by modulation of IRS1-Ser307 phosphorylation. METHODS: Male KK/HlJ mice (genetically obese and insulin resistant) were supplemented daily with chromium-containing milk powder or placebo for 7 weeks. In analysing functionally characterized insulin resistance, the changes of blood biochemicals, inflammatory factors and insulin signalling molecules in skeletal muscle were analysed. RESULTS: Using KK mice model, we demonstrated that daily supplementation of trivalent chromium-containing milk powder reduced serum levels of glucose, insulin and triglycerides, and improved glucose and insulin tolerance. Mechanistic study showed that chromium supplementation activated postreceptor insulin signalling such as increasing IRS1, IRS1 tyrosine phosphorylation, p85alpha regulatory subunit of phosphatidylinositol 3-kinase and glucose transporter 4 expression, stimulating Akt activity, downregulating c-Jun N-terminal kinase (JNK) activity and decreasing IRS1 ubiquitinization and insulin resistance-associated IRS1 phosphorylation (IRS1-Ser307) in skeletal muscle. In addition, chromium supplementation attenuated pro-inflammatory cytokine expression in both blood circulation and skeletal muscle. CONCLUSION: Our data suggest that chromium-containing milk powder supplementation can provide a beneficial effect in diabetic subjects by enhancing insulin signalling in skeletal muscle. The improvement in insulin signalling by chromium was associated with the decreased IRS1-Ser307 phosphorylation, JNK activity and pro-inflammatory cytokine production. SN - 1463-1326 UR - https://www.unboundmedicine.com/medline/citation/18721257/Chromium_supplementation_enhances_insulin_signalling_in_skeletal_muscle_of_obese_KK/HlJ_diabetic_mice_ L2 - https://doi.org/10.1111/j.1463-1326.2008.00936.x DB - PRIME DP - Unbound Medicine ER -