A human in vitro 3D neo-cartilage model to explore the response of OA risk genes to hyper-physiological mechanical stress.
Osteoarthr Cartil Open
; 4(1): 100231, 2022 Mar.
Article
em En
| MEDLINE
| ID: mdl-36474468
ABSTRACT
Objective:
Due to the complexity and heterogeneity of osteoarthritis (OA) pathophysiology, studying the interaction between intrinsic molecular changes in chondrocytes after hyper-physiological mechanical stress (MS) and aberrant signalling of OA risk genes remains a challenge. In this study we set out to set up an in vitro 3D neo cartilage pellet model that enables us to explore the responses of OA risk genes to hyper-physiological MS.Design:
Human primary chondrocyte neo-cartilage pellets were exposed for 2 days to 2 â× â10 âmin of hyper-physiological dynamic MS attained by a 20% strain and a frequency of 5 âHz. In order to assess cartilage damage, sulphated glycosaminoglycan (sGAG) content in the neo-cartilage was quantified using Alcian blue staining and a dimethyl methylene blue (DMMB) assay, while cleavage of aggrecan was visualized by immunohistochemical staining of aggrecan neo-epitope NITEGE. In addition, changes in expression levels of catabolic, anabolic and hypertrophic genes, and of three OA risk genes; IL11, MGP and TGFA were determined.Results:
Hyper-physiological MS induced cartilage damage, as reflected by decreased sGAG content. mRNA levels of aggrecanase ADAMTS5 were increased, while hypertrophic gene RUNX2 was downregulated. MS increased expression of pro-apoptotic marker NOXA. Furthermore, 20% MS led to increased expression of all three OA risk genes IL11, MGP and TGFA.Conclusions:
We established a human in vitro model in which hyper-physiological MS induced cartilage damage and catabolic signalling. Next, we demonstrated its usage to study OA risk genes and their response to the mechanical aspects of OA pathophysiology.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Etiology_studies
/
Risk_factors_studies
Idioma:
En
Revista:
Osteoarthr Cartil Open
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Holanda