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2017 ; 37
(6
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Myocyte-Derived Hsp90 Modulates Collagen Upregulation via Biphasic Activation of
STAT-3 in Fibroblasts during Cardiac Hypertrophy
#MMPMID28031326
Datta R
; Bansal T
; Rana S
; Datta K
; Datta Chaudhuri R
; Chawla-Sarkar M
; Sarkar S
Mol Cell Biol
2017[Mar]; 37
(6
): ä PMID28031326
show ga
Signal transducer and activator of transcription 3 (STAT-3)-mediated signaling in
relation to upregulated collagen expression in fibroblasts during cardiac
hypertrophy is well defined. Our recent findings have identified heat shock
protein 90 (Hsp90) to be a critical modulator of fibrotic signaling in cardiac
fibroblasts in this disease milieu. The present study was therefore intended to
analyze the role of Hsp90 in the STAT-3-mediated collagen upregulation process.
Our data revealed a significant difference between in vivo and in vitro results,
pointing to a possible involvement of myocyte-fibroblast cross talk in this
process. Cardiomyocyte-targeted knockdown of Hsp90 in rats (Rattus norvegicus) in
which the renal artery was ligated showed downregulated collagen synthesis.
Furthermore, the results obtained with cardiac fibroblasts conditioned with
Hsp90-inhibited hypertrophied myocyte supernatant pointed toward cardiomyocytes'
role in the regulation of collagen expression in fibroblasts during hypertrophy.
Our study also revealed a novel signaling mechanism where myocyte-derived Hsp90
orchestrates not only p65-mediated interleukin-6 (IL-6) synthesis but also its
release in exosomal vesicles. Such myocyte-derived exosomes and myocyte-secreted
IL-6 are responsible in unison for the biphasic activation of STAT-3 signaling in
cardiac fibroblasts that culminates in excess collagen synthesis, leading to
severely compromised cardiac function during cardiac hypertrophy.