Igor V. Yosipiv

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Angiotensin-converting enzyme or kininase II (ACE-KII) plays a central role in the control of circulating and tissue levels of angiotensin II and kinins. Both peptides have been implicated in the regulation of renal function and growth during normal development. We tested the hypothesis that the developing rat kidney expresses ACE-KII mRNA transcripts and(More)
An important role for bradykinin (BK) in nephrogenesis has been suggested based on impairment of renal growth in developing rats treated with a kinin antagonist. However, direct effects of BK on renal cell mitogenesis have not been reported. In the present study, we examined the mitogenic effects of BK on cultured rat mesangial cells. Transcripts encoding(More)
Congenital abnormalities of the kidney and urinary tract are a common cause of end-stage renal disease in children. Host and environment factors are implicated in the pathogenesis of aberrant renal development. However, direct evidence linking gene-environment interactions with congenital renal disease is lacking. We report an animal model of renal(More)
Angiotensin converting enzyme (ACE, i.e., kininase II), a key regulator of kinins and angiotensin II (ANG II) generation, is developmentally regulated and its expression is induced at a specific time point (day 15) of postnatal kidney development. The present study tested the hypothesis that endogenous kinins and ANG II regulate the developmental expression(More)
Molecular, biochemical, and evolutionary studies indicate that somatic angiotensin-converting enzyme (ACE) is developmentally regulated in a tissue-specific manner. However, many important questions remain unanswered. For example, the regulatory mechanisms that control the cell- and stage-specific expression of ACE remain largely unknown. The nature,(More)
Unilateral ureteral obstruction (UUO) alters the expression of genes encoding for the renin-angiotensin system (RAS). We tested the hypothesis that changes in RAS genes expression occur soon after obstruction. Indeed, measurements during the first 24 hours of UUO showed up-regulation of renin mRNA in the obstructed kidney at 1 hour. UUO also led to(More)
The kallikrein-kinin system is developmentally expressed in newborn kidneys. In addition, bradykinin (BK) is mitogenic in cultured glomerular mesangial cells. However, the role of endogenous BK in postnatal renal development has not been defined. In this study, the role of the BK-B2 receptor in neonatal kidney growth in the rat was examined. RNA blot(More)
The mechanisms involved in the postnatal induction of renal kallikrein gene transcription and enzymatic activity are unknown. The present study was designed to test the hypothesis that salt (NaCl) intake regulates the ontogeny of renal kallikrein gene expression and enzymatic activity and urinary kallikrein excretion. Newborn rats were artificially fed via(More)
The present study was performed to evaluate the role of bradykinin, acting via B2 receptors, in the developmental rise in renal blood flow (RBF) and glomerular filtration rate (GFR) in the rat. Newborn rats were chronically treated from birth with the kinin B2 receptor antagonist HOE-140 (600 micrograms/kg sc, every 12 h, n = 9) or 0.9% saline (n = 7).(More)