Diabetes & Metabolism Journal

Original Articles

The Effects of D-Chiro-Inositol on Glucose Metabolism in 3T3-L1 Cells.: Kang Seo Park, Jae Min Lee, Bon Jeong Ku, Young Suk Jo, Seong Kyu Lee, Kyung Wan Min, Kyung Ah Han, Hyo Jeong Kim, Hyun Jin Kim; Korean Diabetes J. 2008;32(3):196-203. Published online June 1, 2008; DOI: https://doi.org/10.4093/kdj.2008.32.3.196

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BACKGROUND
The target of the treatment of metabolic syndrome and diabetes is an improvement of insulin resistance. D-chiro-inositol (DCI) plays a role in a phospholipid mediating intracellular insulin action. In the previous studies, the urine level of DCI were decreased in the diabetic animal with insulin resistance. Some clinical studies showed that DCI improved a glucose level and HbA1c. Therefore we studied the relationship between DCI and glucose metabolism, especially insulin resistance. METHODS: To investigate the mechanism of DCI affecting the glucose metabolism, we examined the effects of DCI on 2-deoxyglucose uptake, gene expression of adipocytokines and AMPK pathway by using RT-PCR and western blot in 3T3-L1 cells. RESULTS: Insulin-stimulated 2-deoxyglucose uptake increased in DCI-treated cells by about 1.2-fold (relative to the control) and was inhibited by phosphoinositide 3-kinase (PI3 Kinase) inhibitors (Wortmanin, LY294002) and AMPK inhibitor (STO-609). In Western blot analysis, it didn't show the difference of phosphorylation of Akt and AMPK between DCI-treated group and control in 3T3-L1 cells. However, DCI decreased the gene expression of resistin in 3T3-L1 cells. CONCLUSION: DCI may involve other pathway of insulin signaling, but not PI3 Kinase and AMPK signaling pathways and it may be useful in managing metabolic syndrome by improving insulin resistance through increasing glucose uptake and decreasing resistin relevant to insulin resistance.

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Variation of Pinitol Content for Domestic Legume Species in Korea
Seung-Min Seo, Yeon-Shin Jeong, Dhakal Krisna Hari, Dong-Hyun Shin, In-Jung Lee, Eun-Sook Park, Jeong-Dong Lee, Young-Hyun Hwang
Korean Journal of Crop Science.2011; 56(1): 50. CrossRef

Effect of Pinitol on Glucose Metabolism and Adipocytokines in Uncontrolled Type 2 Diabetes Mellitus.: Mi Jin Kim, Kwang Ha Yoo, Hyung Suk Park, Sang Man Chung, Choon Jo Chin, Young Sook Choi, Choon Hee Chung; Korean Diabetes J. 2005;29(4):344-351. Published online July 1, 2005

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Abstract PDF: BACKGROUND
Pinitol(3-O-methyl-D-chiro-inositol) has been identified in putative insulin mediator fractions possessing hypoglycemic activity, and appears to act downstream in the insulin-signaling pathway to mimic the effects of insulin. We evaluated the effect of pinitol therapy in type 2 diabetic patients who were poorly controlled with hypoglycemic drugs such as sulfonylurea, metformin and/or insulin. METHODS: Twenty type 2 diabetic patients were enrolled in this our study. The fasting glucose and c-peptide, total cholesterol, triglyceride, HDL-and LDL-cholesterols were checked before and after treatment with 20mg.kg(-1).day(-1) pinitol for twelve weeks. All subjects continued their current medications during the study. Adipocytokines, such as adiponectin, leptin, free fatty acid and CRP, were checked before and after the pinitol treatment. RESULTS: After the pinitol treatment, the fasting and post-prandial glucose levels and hemoglobin A1c were significantly decreased(P<0.05). The fasting serum adiponectin, leptin, free fatty acid and CRP levels remained unchanged after the pinitol treatment. In the non-responder groups, the serum c-peptide levels were higher than those in the responder groups. CONCLUSION: Twelve weeks of pinitol treatment altered glucose metabolism, but not the lipid profiles or adipocytokine levels. Additional research will be required are needed to define the physiological and potential therapeutic effects of pinitol.

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