Effects of autophagy on acid-sensing ion channel 1a-mediated apoptosis in rat articular chondrocytes

Rheumatoid arthritis (RA) is a degenerative joint disease that is caused by multiple pathogenic factors. However, the precise etiology of RA is still unknown. Our previous studies demonstrated that acid-sensing ion channel 1a (ASIC1a)-mediated articular chondrocyte apoptosis played a key role in the...

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Published in:Molecular and cellular biochemistry 2018-06, Vol.443 (1-2), p.181-191
Main Authors: Xie, Ya-Ya, Li, Yue, Zhou, Ren-peng, Dai, Bei-Bei, Qian, Yue-jiao, Wu, Xiao-shan, Ge, Jin-fang, Hu, Wei, Chen, Fei-hu
Format: Article
Language:English
Subjects:
Apoptosis
Arthritis
Autophagy
Biochemistry
Biomedical and Life Sciences
Cardiology
Chondrocytes
Etiology
Hydrochloric acid
Ion channels
Joint diseases
Knee
Life Sciences
Medical Biochemistry
Oncology
Pathogenesis
Phagocytosis
Pretreatment
Rheumatoid arthritis
Rheumatoid factor
Ribonucleic acid
RNA
siRNA
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Summary:Rheumatoid arthritis (RA) is a degenerative joint disease that is caused by multiple pathogenic factors. However, the precise etiology of RA is still unknown. Our previous studies demonstrated that acid-sensing ion channel 1a (ASIC1a)-mediated articular chondrocyte apoptosis played a key role in the progression of RA. In this study, we aim to explore whether ASIC1a mediates autophagy or not and the effect of autophagy on ASIC1a-mediated apoptosis. Primary articular chondrocytes, extracted from rat knee joints, were exposed to different concentrations of concentrated hydrochloric acid for different time intervals in vitro. The results indicated that extracellular acid treatment induced autophagy of rat articular chondrocytes. Moreover, inhibition of ASIC1a with either psalmotoxin 1 or ASIC1a short hairpin RNA reduced the autophagy flux. The results suggested that ASIC1a mediated acid-induced autophagy. Pretreatment with autophagy antagonist 3-methyladenine decreased the autophagy, but increased the apoptosis mediated by ASIC1a. Furthermore, knockdown of Beclin 1 by small interfering RNA attenuated autophagy but potentiated ASIC1a-mediated apoptosis of rat articular chondrocytes. Taken together, these findings suggested that both inhibition and silencing of autophagy could enhance ASIC1a-mediated apoptosis in rat articular chondrocytes, and therefore, autophagy is likely to be a new mechanism involved in ASIC1a-mediated apoptosis of articular chondrocytes during the pathogenesis of RA.
ISSN:0300-8177
1573-4919
DOI:10.1007/s11010-017-3223-6