# Co-Culture Approaches in Cartilage and Bone Tissue Regeneration

## TL;DR

This paper explores co-culture techniques to improve cartilage and bone tissue regeneration by mimicking natural cell interactions.

## Contribution

The paper introduces and reviews co-culture systems involving MSCs and other cells for cartilage and bone regeneration.

## Key findings

- Co-culture systems promote better tissue regeneration by mimicking native cell interactions.
- Monoculture approaches face limitations like dedifferentiation and poor tissue formation.
- MSCs from various sources are used in co-cultures to enhance osteogenesis and angiogenesis.

## Abstract

Cartilage and bone defects as well as osteoarthritis are prevalent worldwide, affecting individuals across all age groups, from young, active populations to older adults. The standard protocol in cartilage regeneration involves knee replacement surgery through the implantation of an endoprosthesis. Current clinical protocols involving cell-based therapies are associated with limitations, including the lack of functional cartilage-like tissue and dedifferentiation of chondrocyte, particularly during monoculture. Similarly, in bone regeneration, the “gold standard” is the use of bone auto- or allografts, which are associated with immunological rejection, inadequate vascularization, and limited osteogenesis. To overcome these limitations, various co-culture techniques have been introduced as promising strategies for cartilage and bone tissue regeneration. These systems aim to mimic native microenvironments by promoting interactions between chondrocytes and mesenchymal stromal cells (MSCs) in cartilage repair and between osteogenic and angiogenic cells in bone regeneration. This paper introduces different co-culture systems focusing on in vitro crosstalk between MSCs derived from various sources and other somatic cell populations in cartilage and bone regeneration.