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2018 ; 17
(4
): 5272-5282
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Expression of immunoglobulin A in human mesangial cells and its effects on cell
apoptosis and adhesion
#MMPMID29393471
Deng H
; Ma J
; Jing Z
; Deng Z
; Liang Y
; A L
; Liu Y
; Qiu X
; Wang Y
Mol Med Rep
2018[Apr]; 17
(4
): 5272-5282
PMID29393471
show ga
IgA nephropathy (IgAN) is characterized by predominant IgA deposition in the
glomerular mesangium. It has been considered that the deposited IgA is
synthesized by B cells, although recent reports have suggested the implication of
other cell types. Therefore, the present study investigated whether glomerular
mesangial cells could produce IgA by themselves. Semi?quantitative reverse
transcription-polymerase chain reaction, and immunostaining analysis revealed
that the IgA protein and gene transcripts were expressed in primary human renal
mesangial cells (HRMCs). Furthermore, the IgA heavy chain (?1 and ?2) and the
light chain (? and ?) were localized in the cytoplasm or were located on the cell
membranes of human mesangial cells (HMCs). Mass spectrometry results indicated
that Ig ?1 and Ig ?2 were secreted in the culture media of HMCs. The transcripts
of Ig ?, Ig ? and Ig ? constant regions were detected. The predominant
rearrangement pattern of the variable region of Ig ?, was V?3?20*01/J?1*01 in
HMCs and V?1?12*01/J?4*01 in HRMCs. In addition, knockdown of Ig ?1 expression by
small interfering RNA (siRNA) inhibited cell adhesion and promoted apoptosis. Our
findings demonstrate that HMCs can express IgA, and that this expression is
associated with cell functions, which may contribute to the deposition of IgA in
patients with IgAN.