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2017 ; 2
(4
): 739-748
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
The Chemical Chaperone, PBA, Reduces ER Stress and Autophagy and Increases
Collagen IV ?5 Expression in Cultured Fibroblasts From Men With X-Linked Alport
Syndrome and Missense Mutations
#MMPMID29142990
Wang D
; Mohammad M
; Wang Y
; Tan R
; Murray LS
; Ricardo S
; Dagher H
; van Agtmael T
; Savige J
Kidney Int Rep
2017[Jul]; 2
(4
): 739-748
PMID29142990
show ga
INTRODUCTION: X-linked Alport syndrome (OMIM 301050) is caused by COL4A5 missense
variants in 40% of families. This study examined the effects of chemical
chaperone treatment (sodium 4-phenylbutyrate) on fibroblast cell lines derived
from men with missense mutations. METHODS: Dermal fibroblast cultures were
established from 2 affected men and 3 normals. Proliferation rates were examined,
the collagen IV ?5 chain localized with immunostaining, and levels of the intra-
and extracellular chains quantitated with an in-house enzyme-linked immunosorbent
assay. COL4A5 mRNA was measured using quantitative reverse transcriptase
polymerase chain reaction. Endoplasmic reticulum (ER) size was measured on
electron micrographs and after HSP47 immunostaining. Markers of ER stress (ATF6,
HSPA5, DDIT3), autophagy (ATG5, BECN1, ATG7), and apoptosis (CASP3, BAD, BCL(2))
were also quantitated by quantitative reverse transcriptase polymerase
chain reaction. Measurements were repeated after 48 hours of incubation with 10
mM sodium 4-phenylbutyrate acid. RESULTS: Both COL4A5 missense variants were
associated with reduced proliferation rates on day 6 (P = 0.01 and P = 0.03), ER
enlargement, and increased mRNA for ER stress and autophagy (all P values < 0.05)
when compared with normal. Sodium 4-phenylbutyrate treatment increased COL4A5
transcript levels (P < 0.01), and reduced ER size (P < 0.01 by EM and P < 0.001
by immunostaining), ER stress (p HSPA5 and DDIT3, all P values < 0.01) and
autophagy (ATG7, P < 0.01). Extracellular collagen IV ?5 chain was increased in
the M1 line only (P = 0.06). DISCUSSION: Sodium 4-phenylbutyrate increases
collagen IV ?5 mRNA levels, reduces ER stress and autophagy, and possibly
facilitates collagen IV ?5 extracellular transport. Whether these actions delay
end-stage renal failure in men with X-linked Alport syndrome and missense
mutations will only be determined with clinical trials.