Invited review: mesenchymal progenitor cells in intramuscular connective tissue development

Area of Science:

• Muscle biology
• Developmental biology
• Meat science

Background:

• Intramuscular connective tissue and its cross-linking contribute to meat toughness.
• Connective tissue is synthesized by intramuscular fibroblasts, which originate from progenitor cells.
• Skeletal muscle development involves the differentiation of multipotent mesenchymal stem cells into various cell types, including adipocytes and fibroblasts.

Purpose of the Study:

• To investigate the factors influencing intramuscular adipogenesis and fibrogenesis during muscle development.
• To understand how progenitor cell differentiation impacts meat quality traits such as marbling and tenderness.
• To explore the role of the transforming growth factor (TGF) β signaling pathway in fibrogenesis.

Main Methods:

• Analysis of intramuscular connective tissue and its relationship with meat quality.
• Examination of progenitor cell differentiation pathways (myogenic, adipogenic, fibrogenic).
• Review of existing literature on muscle development and extracellular matrix regulation.

Main Results:

• Strengthening progenitor proliferation enhances both intramuscular adipogenesis (marbling) and fibrogenesis (connective tissue).
• Enhancing progenitor cell conversion to adipogenesis reduces fibrogenesis, improving meat marbling and tenderness.
• The transforming growth factor (TGF) β signaling pathway is a key regulator of fibrogenesis.

Conclusions:

• Modulating progenitor cell differentiation offers a strategy to improve meat quality by balancing adipogenesis and fibrogenesis.
• Further research is needed on the extracellular matrix's role in muscle development and early cell differentiation.
• Understanding these processes is crucial for enhancing meat tenderness and marbling through targeted interventions.