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2015 ; 5
(ä): 17637
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Podocyte injury in diabetic nephropathy: implications of angiotensin II-dependent
activation of TRPC channels
#MMPMID26656101
Ilatovskaya DV
; Levchenko V
; Lowing A
; Shuyskiy LS
; Palygin O
; Staruschenko A
Sci Rep
2015[Dec]; 5
(ä): 17637
PMID26656101
show ga
Injury to podocytes is considered a major contributor to diabetic kidney disease:
their loss causes proteinuria and progressive glomerulosclerosis. Podocyte
depletion may result from improper calcium handling due to abnormal activation of
the calcium permeant TRPC (Transient Receptor Potential Canonical) channels.
Angiotensin II (Ang II) levels are found to be elevated in diabetes; furthermore,
it was reported that Ang II causes activation of TRPC6 in podocytes. We
hypothesized here that Ang II-mediated calcium influx is aggravated in the
podocytes under the conditions of type 1 diabetic nephropathy (DN). Diabetes was
induced in the Dahl Salt-Sensitive rats by an injection of streptozotocin
(STZ-SS). Eleven weeks post treatment was sufficient for the animals to develop
hyperglycemia, excessive urination, weight loss, microalbuminuria, nephrinuria
and display renal histological lesions typical for patients with DN. Patch-clamp
electrophysiology performed on podocytes of the freshly isolated glomeruli showed
enhanced basal TRPC channel activity in the STZ-SS rats, and increased response
to Ang II; total calcium influx triggered by Ang II application was also
augmented in podocytes of these rats. Our studies have a strong potential for
advancing the understanding of TRPC-mediated effects on podocytopenia in DN
initiation.