The long-term objective of this proposal is to identify renal microRNAs (miRNAs) and their target genes that could potentially contribute to the progression of diabetic nephropathy (DN). MicroRNAs constitute a class of highly conserved noncoding RNAs that act as negative regulators of gene expression by either inhibiting the translation of mRNAs or destabilizing them. Because individual often regulate the expression of multiple target genes with related functions, dysregulation of a single microRNA can, in principle, microRNAs influence an entire gene network and thereby contribute to complex disease phenotypes such as DN. The main aim of the current proposed study is to evaluate the pathogenic role of microRNA-93 (miR-93) in DN. Our main hypothesis is that miR-93 contributes to the pathogenesis of DN via its modulatory involvement on VEGF signaling pathway. Our hypothesis is based on several novel observations: 1) we have recently shown miR-93 is a """"""""signature"""""""" miRNA in the diabetic milieu based on comparative microRNA arrays, 2), we have shown for the first time that miR-93 plays a critical role in regulating VEGF-A expression in hyperglycemic conditions in vitro and in vivo (Long J. et al. J. Biol. Chem. 2010), and 3) targeting of miR-93 leads to a significant increase in VEGF secretion in an inducible mouse model of VEGF expression. Based upon these initial observations, we now propose an integrated in vitro and in vivo approach to test three specific aims.
Aim 1 : Assess the effect of conditional tissue-specific forced expression of miR-93 in the murine models of DN, Aim 2: Define the molecular targets through which miR-93 exerts its effect in vitro and in vivo.
Aim 3 : Characterization of glucose-responsive elements (GRE) of the mouse miR-93 promoter in podocytes. The findings of this application will provide a significant advance in three aspects: first, this proposal represents a new therapeutic approach, and potentially a new class of agents in the fight against diabetic kidney disease. Second, our research will shed light not only on the role of miR-93 in hyperglycemic conditions, but also on the pathobiology of VEGF in diabetic nephropathy. And third, we will generate a genetic model to confirm that miR-93 is directly involved in the pathogenesis of DN. This genetic model will provide additional information on the role of miR- 93, and its potential targets in DN.

Public Health Relevance

Diabetic nephropathy represents the primary cause of ESRD in the US, underscoring the need for innovative therapies for preventing its progression. New evidence suggests that microRNAs in the kidney are key pathogenic factors in diabetic nephropathy. We propose that targeting of miR-93, a novel microRNA in the kidney, holds promise as a novel therapeutic strategy to ameliorate progression of diabetic nephropathy.

National Institute of Health (NIH)
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Research Project (R01)
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Pathobiology of Kidney Disease Study Section (PBKD)
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Rys-Sikora, Krystyna E
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University of Texas MD Anderson Cancer Center
Internal Medicine/Medicine
United States
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Galvan, Daniel L; Green, Nathanael H; Danesh, Farhad R (2017) The hallmarks of mitochondrial dysfunction in chronic kidney disease. Kidney Int 92:1051-1057
Galvan, Daniel L; Badal, Shawn S; Long, Jianyin et al. (2017) Real-time in vivo mitochondrial redox assessment confirms enhanced mitochondrial reactive oxygen species in diabetic nephropathy. Kidney Int 92:1282-1287
Badal, Shawn S; Wang, Yin; Long, Jianyin et al. (2016) miR-93 regulates Msk2-mediated chromatin remodelling in diabetic nephropathy. Nat Commun 7:12076
Long, Jianyin; Badal, Shawn S; Ye, Zengchun et al. (2016) Long noncoding RNA Tug1 regulates mitochondrial bioenergetics in diabetic nephropathy. J Clin Invest 126:4205-4218
Galvan, Daniel L; Danesh, Farhad R (2016) Paradoxical Role of IL-17 in Progression of Diabetic Nephropathy. J Am Soc Nephrol 27:657-8
Ayanga, Bernard A; Badal, Shawn S; Wang, Yin et al. (2016) Dynamin-Related Protein 1 Deficiency Improves Mitochondrial Fitness and Protects against Progression of Diabetic Nephropathy. J Am Soc Nephrol 27:2733-47
Badal, Shawn S; Danesh, Farhad R (2015) Diabetic Nephropathy: Emerging Biomarkers for Risk Assessment. Diabetes 64:3063-5
Badal, Shawn S; Danesh, Farhad R (2015) MicroRNAs and their applications in kidney diseases. Pediatr Nephrol 30:727-40
Badal, Shawn S; Danesh, Farhad R (2014) New insights into molecular mechanisms of diabetic kidney disease. Am J Kidney Dis 63:S63-83
Long, Jianyin; Badal, Shawn S; Wang, Yin et al. (2013) MicroRNA-22 is a master regulator of bone morphogenetic protein-7/6 homeostasis in the kidney. J Biol Chem 288:36202-14

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