P713Short term treatment of a low dose erythropoietin improves vascular function in a rat model of insulin resistance

Autor: Y Watanabe, A Yamaoka, S Sakurai, Tetsuo Nakata, Yoshimi Tanaka, Naseratun Nessa, Hiroe Toba, Miyuki Kobara, A Miyamoto
Rok vydání: 2019
Předmět:
Zdroj: European Heart Journal. 40
ISSN: 1522-9645
0195-668X
Popis: Background/Introduction Erythropoietin (EPO) exerts haematopoiesis-independent cardiovascular and renal protective effects by binding to EPO receptors expressed in hearts, arteries, and kidneys. We have reported that EPO inhibits vascular and renal injury in rat models of hypertension and type 1 diabetes. Recent studies report that EPO improves glucose tolerance in insulin resistant animals. Purpose This study investigated whether EPO would inhibit vascular and renal dysfunction in the setting of insulin resistance. Methods Rats were treated with sucrose (12% in drinking water) for 10 weeks to induce insulin resistance. EPO (3 times/week, s.c) was administered at the dose of 150U/kg for 10 weeks from the beginning (group A) or at the dose of 75U/kg for the last 4 weeks (group B) of sucrose treatment. Blood pressure was measured every second week by the tail-cuff method. HOMA-IR, haematocrit, and urinary protein excretion were measured. Using isolated aortas, acetylcholine-induced vasorelaxation under phenylephrine-induced pre-contraction was examined. Aortic sections were stained with haematoxylin-eosin. Results Both groups A and B showed higher haematocrit levels compared with the control and sucrose alone-treated groups. Sucrose treatment increased HOMA-IR (7.7±2.0 vs. 24±4.5, p Conclusions EPO inhibited insulin resistance and vascular injury in sucrose-induced insulin resistant rats. Further investigation into the mechanisms of tissue protective effects of EPO, especially focusing on the effects on insulin signalling in not only hepatic and muscle cell but also vascular and renal cells, will be needed.
Databáze: OpenAIRE
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