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
Functional heterogeneity of meniscal fibrochondrocytes and microtissue models is dependent on modality of fibrochondrocyte isolation
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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