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2016 ; 90
(5
): 1056-1070
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Loss of endogenous thymosin ?(4) accelerates glomerular disease
#MMPMID27575556
Vasilopoulou E
; Kolatsi-Joannou M
; Lindenmeyer MT
; White KE
; Robson MG
; Cohen CD
; Sebire NJ
; Riley PR
; Winyard PJ
; Long DA
Kidney Int
2016[Nov]; 90
(5
): 1056-1070
PMID27575556
show ga
Glomerular disease is characterized by morphologic changes in podocyte cells
accompanied by inflammation and fibrosis. Thymosin ?(4) regulates cell
morphology, inflammation, and fibrosis in several organs and administration of
exogenous thymosin ?(4) improves animal models of unilateral ureteral obstruction
and diabetic nephropathy. However, the role of endogenous thymosin ?(4) in the
kidney is unknown. We demonstrate that thymosin ?(4) is expressed prominently in
podocytes of developing and adult mouse glomeruli. Global loss of thymosin ?(4)
did not affect healthy glomeruli, but accelerated the severity of immune-mediated
nephrotoxic nephritis with worse renal function, periglomerular inflammation, and
fibrosis. Lack of thymosin ?(4) in nephrotoxic nephritis led to the
redistribution of podocytes from the glomerular tuft toward the Bowman capsule
suggesting a role for thymosin ?(4) in the migration of these cells. Thymosin
?(4) knockdown in cultured podocytes also increased migration in a wound-healing
assay, accompanied by F-actin rearrangement and increased RhoA activity. We
propose that endogenous thymosin ?(4) is a modifier of glomerular injury, likely
having a protective role acting as a brake to slow disease progression.