Dataset Information
Cartilage endoplasmic reticulum stress may influence the onset but not the progression of experimental osteoarthritis.
Ontology highlight
ABSTRACT: Background
Osteoarthritis has been associated with a plethora of pathological factors and one which has recently emerged is chondrocyte endoplasmic reticulum (ER) stress. ER stress is sensed by key ER-resident stress sensors, one of which is activating transcription factor 6 (ATF6). The purpose of this study is to determine whether increased ER stress plays a role in OA.Methods
OA was induced in male wild-type (+/+), ColIITgcog (c/c) and Atf6?-/- mice by destabilisation of the medial meniscus (DMM). c/c mice have increased ER stress in chondrocytes via the collagen II promoter-driven expression of ER stress-inducing Tgcog. Knee joints were scored histologically for OA severity. RNA-seq was performed on laser-micro-dissected RNA from cartilage of +/+ and c/c DMM-operated mice.Results
In situ hybridisation demonstrated a correlation between the upregulation of ER stress marker, BiP, and early signs of proteoglycan loss and cartilage damage in DMM-operated +/+ mice. Histological analysis revealed a significant reduction in OA severity in c/c mice compared with +/+ at 2?weeks post-DMM. This chondroprotective effect in c/c mice was associated with a higher ambient level of BiP protein prior to DMM and a delay in chondrocyte apoptosis. RNA-seq analysis suggested Xbp1-regulated networks to be significantly enriched in c/c mice at 2?weeks post-DMM. Compromising the ER through genetically ablating Atf6?, a key ER stress sensor, had no effect on DMM-induced OA severity.Conclusion
Our studies indicate that an increased capacity to effectively manage increases in ER stress in articular cartilage due either to pre-conditioning as a result of prior exposure to ER stress or to genetic pre-disposition may be beneficial in delaying the onset of OA, but once established, ER stress plays no significant role in disease progression.
SUBMITTER: Kung LHW
PROVIDER: S-EPMC6737683 | biostudies-literature | 2019 Sep
REPOSITORIES: biostudies-literature
Publications
Cartilage endoplasmic reticulum stress may influence the onset but not the progression of experimental osteoarthritis.
Arthritis research & therapy 20190911 1
<h4>Background</h4>Osteoarthritis has been associated with a plethora of pathological factors and one which has recently emerged is chondrocyte endoplasmic reticulum (ER) stress. ER stress is sensed by key ER-resident stress sensors, one of which is activating transcription factor 6 (ATF6). The purpose of this study is to determine whether increased ER stress plays a role in OA.<h4>Methods</h4>OA was induced in male wild-type (+/+), ColIITg<sup>cog</sup> (c/c) and Atf6α<sup>-/-</sup> mice by des ...[more]