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Objectives.  The present study was designed to assess whether apoptosis-related genes as  parp-1  and  bax  could be targets for treatment of diabetes mellitus and whether vitamin D may exert beneficial effects. Methods.  Vitamin D 3  treatment for 4 weeks, starting after 4 weeks of the diabetes duration. The expression of  parp-1  and  bax  genes was estimated on mRNA levels using real time quantitative polymerase chain reaction. Results.  After 8 weeks, diabetic rats had weight loss, while blood glucose was increased about 4.9-fold compared to control group. Vitamin D 3  administration to diabetic animals had no effect on these parameters. It was found that total serum alkaline phosphatase activity was significantly elevated in diabetic rats as compared to control animals and was restored by vitamin D 3 . Diabetes was accompanied by reduction of nicotinamidadenindinucleotide, a substrate of poly-ADP-ribosylation, level by 31.7% as compared to control rats, which was not reversed in response to vitamin D 3  treatment. In diabetic hearts, the mRNA expression level of  parp-1  gene was 2.8-fold higher compared to control rats and partially decreased by vitamin D3 treatment. Less significant alterations were observed in diabetic hearts for the mRNA expression level of  bax  gene that was 2.0-fold higher compared to control animals and vitamin D 3  normalized it. These results indicate that cardiomyocytes have a tendency to apoptosis. Conclusions.  The findings suggest that investigated genes can be targets at the transcriptional level for vitamin D action that may be contributed to the improving metabolic/signaling pathways induced by diabetes mellitus.

The parp-1 and bax genes as potential targets for treatment of the heart functioning impairments induced by type 1 diabetes mellitus