title: Aquaporin 1 contributes to chondrocyte apoptosis in a rat model of osteoarthritis.
abstract: Aquaporins (AQPs) have been found to be associated with a number of diseases. However, the role of AQP‑1 in the pathogenesis of osteoarthritis remains unclear. We previously found that AQP‑1 expression was upregulated in osteoarthritic cartilage and strongly correlated with caspase‑3 expression and activity. The aim of this study was to further investigate the association of AQP‑1 expression with chondrocyte apoptosis in a rat model of osteoarthritis, using RNA interference to knock down AQP‑1. For this purspose, 72 male Sprague‑Dawley rats were randomly assigned to 3 groups as follows: the control group not treated surgically (n=24), the sham‑operated group (n=24), and the osteoarthritis group (n=24). Osteoarthritis was induced by amputating the anterior cruciate ligament and medial collateral ligament and partially excising the medial meniscus. Chondrocytes from the rats with osteoarthritis were isolated and cultured. shRNAs were used to knock down AQP‑1 expression in the cultured chondrocytes. The expression of AQP‑1 and caspase‑3 was determined by reverse transcription-quantitative polymerase chain reaction. Caspase‑3 activity was measured using a caspase‑3 colorimetric assay. The rats in our model of osteoarthritis exhibited severe cartilage damage. The knockdown of AQP‑1 decreased caspase‑3 expression and activity in the cultured chondrocytes. In addition, the expression of AQP‑1 positively correlated with caspase‑3 expression and activity. Thus, the findings of our study, suggest that AQP‑1 promotes caspase‑3 activation and thereby contributes to chondrocyte apoptosis and to the development of osteoarthritis.
authors: Department of Traumatology, The First Affiliated Hospital and College of Clinical Medicine of Henan University of Science and Technology, Luoyang, Henan 471000, P.R. China.
authors: Hangfei
authors: H
authors: Gao
authors: Department of Orthopaedics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China.
authors: Jiancao
authors: J
authors: Gui
authors: Department of Orthopaedics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China.
authors: Liming
authors: L
authors: Wang
authors: Department of Orthopaedics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China.
authors: Yan
authors: Y
authors: Xu
authors: Department of Orthopaedics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China.
authors: Yiqiu
authors: Y
authors: Jiang
authors: Department of Traumatology, The First Affiliated Hospital and College of Clinical Medicine of Henan University of Science and Technology, Luoyang, Henan 471000, P.R. China.
authors: Mingyue
authors: M
authors: Xiong
authors: Department of Traumatology, The First Affiliated Hospital and College of Clinical Medicine of Henan University of Science and Technology, Luoyang, Henan 471000, P.R. China.
authors: Yongguang
authors: Y
authors: Cui
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000235:genetics*; D051398:Aquaporin 1 / Q000235:genetics* / Q000378:metabolism; D002358:Cartilage, Articular / Q000378:metabolism / Q000473:pathology; D053148:Caspase 3 / Q000235:genetics / Q000378:metabolism; D002478:Cells, Cultured; D019902:Chondrocytes / Q000378:metabolism*; D004195:Disease Models, Animal; D004789:Enzyme Activation; D015870:Gene Expression; D055785:Gene Knockdown Techniques; D008297:Male; D010003:Osteoarthritis / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D051381:Rats
chemical_list: D051398:Aquaporin 1; D053148:Caspase 3