Interstitial expression of heat-shock protein 47 correlates with capillary deposition of complement split product C4d in chronic allograft nephropathy.

Abstract:

BACKGROUND:Chronic allograft nephropathy (CAN), associated with late-allograft dysfunction is caused by alloantigen-dependent and -independent mechanisms, and eventually leads to interstitial fibrosis (ci). Activation of complement cascade is considered to be a poor prognostic marker of graft survival. This study was designed to examine the relationship between the expression of C4d and heat-shock protein 47 (HSP47, a collagen-specific chaperone) in the development of interstitial fibroproliferative lesions in CAN. METHODS:Sixty-three renal allograft biopsy specimens, obtained from 48 patients, were examined for the expression of C4d, HSP47, CD68 and alpha-smooth muscle actin (alpha-SMA) by immunohistochemistry. Double-staining was performed to determine the colocalization of C4d and HSP47. The relationship of between the expression of C4d, HSP47, CD68 and alpha-SMA and the clinical and histopathological parameters were statistically analysed. RESULTS:No expression of C4d was noted in the tubulointerstitium including peritubular capillary (PTC) of the control kidney. C4d was expressed in PTC in one-third of allograft renal tissues with morphological evidences of CAN. The interstitial cells around the fibrotic areas of the PTC of CAN were positive for the expression of HSP47. The deposition of C4d in PTC correlated with interstitial expression of HSP47 around the PTC. Most HSP47 expressing cells were phenotypically altered myofibroblasts, as determined by the dual staining of alpha-SMA. CONCLUSIONS:The increased expression of HSP47 positively correlated with the expression of C4d in PTC, and might contribute to the progression of interstitial ci in CAN.

journal_name

Clin Transplant

journal_title

Clinical transplantation

authors

Ohba K,Miyata Y,Koga S,Nishikido M,Kanetake H,Nazneen A,Razzaque MS,Taguchi T

doi

10.1111/j.1399-0012.2005.00426.x

subject

Has Abstract

pub_date

2005-12-01 00:00:00

pages

810-6

issue

6

eissn

0902-0063

issn

1399-0012

pii

CTR426

journal_volume

19

pub_type

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