Insulin glargine affects the expression of Igf-1r, Insr, and Igf-1 genes in colon and liver of diabetic rats

Document Type: Original Article


1 División de Medicina Molecular, Centro de Investigación Biomédica de Occidente. Instituto Mexicano del Seguro Social. Guadalajara, Jalisco, México

2 Instituto de Enfermedades Crónico Degenerativas, Departamento de Biología Molecular y Genómica, C.U.C.S, Universidad de Guadalajara. Guadalajara, Jalisco, México

3 División de Genética, Centro de Investigación Biomédica de Occidente. Instituto Mexicano del Seguro Social. Guadalajara, Jalisco, México.

4 División de Genética, Centro de Investigación Biomédica de Occidente. Instituto Mexicano del Seguro Social. Guadalajara, Jalisco, México


Objective(s): The mitogenic effect of the analogous insulin glargine is currently under debate since several clinical studies have raised the possibility that insulin glargine treatment has a carcinogenic potential in different tissues. This study aimed to evaluate the Igf-1r, Insr, and Igf-1 gene expression in colon and liver of streptozotocin-induced diabetic rats in response to insulin glargine, neutral protamine Hagedorn (NPH) insulin, and metformin treatments.
Materials and Methods: Male Wistar rats were induced during one week with streptozotocin to develop Type 2 Diabetes (T2D) and then randomly distributed into four groups. T2D rats included in the first group received insulin glargine, the second group received NPH insulin, the third group received metformin; finally, untreated T2D rats were included as the control group. All groups were treated for seven days; after the treatment, tissue samples of liver and colon were obtained. Quantitative PCR (qPCR) was performed to analyze the Igf-1r, Insr and Igf-1 gene expression in each tissue sample.
Results: The liver tissue showed overexpression of the Insr and Igf-1r genes (P>0.001) in rats treated with insulin glargine in comparison with the control group. Similar results were observed for the Insr gene (P>0.011) in colonic tissue of rats treated with insulin glargine.
Conclusion: These observations demonstrate that insulin glargine promote an excess of insulin and IGF-1 receptors in STZ-induced diabetic rats, which could overstimulate the mitogenic signaling pathways.


Main Subjects

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