Functional heterogeneity of meniscal fibrochondrocytes and microtissue models is dependent on modality of fibrochondrocyte isolation
Zhiyao Ma , Shikha Chawla , Xiaoyi Lan , Eva Zhou , Aillette Mulet-Sierra , Melanie Kunze , Mark Sommerfeldt , Adetola B. Adesida
Cell Proliferation ›› 2025, Vol. 58 ›› Issue (1) : e13735
Collagenase digestion (d) and cellular outgrowth (og) are the current modalities of meniscus fibrochondrocytes (MFC) isolation for bioengineering and mechanobiology-related studies. However, the impact of these modalities on study outcomes is unknown. Here, we show that og- and d-isolated MFC have distinct proliferative capacities, transcriptomic profiles via RNA sequencing (RNAseq), extracellular matrix (ECM)-forming, and migratory capacities. Our data indicate that microtissue pellet models developed from og-isolated MFC display a contractile phenotype with higher expressions of alpha-smooth muscle actin (ACTA2) and transgelin (TAGLN) and are mechanically stiffer than their counterparts from d-MFC. Moreover, we introduce a novel method of MFC isolation designated digestion-after-outgrowth (dog). The transcriptomic profile of dog-MFC is distinct from d- and og-MFC, including a higher expression of mechanosensing caveolae-associated caveolin-1 (CAV1). Additionally, dog-MFC were superior chondrogenically and generated larger-size microtissue pellet models containing a higher frequency of smaller collagen fibre diameters. Thus, we demonstrate that the modalities of MFC isolation influence the downstream outcomes of bioengineering and mechanobiology-related studies.
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2024 The Author(s). Cell Proliferation published by Beijing Institute for Stem Cell and Regenerative Medicine and John Wiley & Sons Ltd.
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