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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Sex+Med
2014 ; 11
(9
): 2153-63
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Angiotensin-(1-7) reverses angiogenic dysfunction in corpus cavernosum by acting
on the microvasculature and bone marrow-derived cells in diabetes
#MMPMID24953642
Singh N
; Vasam G
; Pawar R
; Jarajapu YP
J Sex Med
2014[Sep]; 11
(9
): 2153-63
PMID24953642
show ga
INTRODUCTION: Angiotensin (Ang)-(1-7) is a recently identified vasoprotective
heptapeptide, and it appears to activate the reparative functions of bone
marrow-derived stem/progenitor cells (BMPCs). AIM: This study evaluated the
effect of Ang-(1-7) in the angiogenic function of cavernosum in type 1 diabetes
(T1D) and delineated the role of BMPCs in this protective function. METHODS: T1D
was induced by streptozotocin in mice, and mice with 20-24 weeks of diabetes were
used for the study. Ang-(1-7) was administered subcutaneously by using osmotic
pumps. Cavernosa, and BMPCs from peripheral blood and bone marrow were evaluated
in different assay systems. MAIN OUTCOME MEASURES: Angiogenic function was
determined by endothelial tube formation in matrigel assay. Circulating BMPCs
were enumerated by flow cytometry and proliferation was determined by BrdU
incorporation. Cell-free supernatant of BMPCs were collected and tested for
paracrine angiogenic effect. Expression of angiogenic factors in BMPCs and
cavernosa were determined by real-time polymerase chain reaction. RESULTS:
Ang-(1-7) (100?nM) stimulated angiogenesis in mouse cavernosum that was partially
inhibited by Mas1 receptor antagonist, A779 (10??M) (P?0.05). In cavernosa of
T1D, the angiogenic responses to Ang-(1-7) (P?0.005) and VEGF (100?nM)
(P?0.03) were diminished. Ang-(1-7) treatment for 4 weeks reversed T1D-induced
decrease in the VEGF-mediated angiogenesis. Ang-(1-7) treatment increased the
circulating number of BMPCs and proliferation that were decreased in T1D
(P?0.02). Paracrine angiogenic function of BMPCs was reduced in diabetic BMPCs,
which was reversed by Ang-(1-7). In diabetic BMPCs, SDF and angiopoietin-1 were
upregulated by Ang-(1-7), and in cavernosum, VEGFR1, Tie-2, and SDF were
upregulated and angiopoietin-2 was down-regulated. CONCLUSIONS: Ang-(1-7)
stimulates angiogenic function of cavernosum in diabetes via its stimulating
effects on both cavernosal microvasculature and BMPCs.