Toll-like receptor ligand-dependent inflammatory responses in chick skeletal muscle myoblasts

Area of Science:

• Immunology
• Cell Biology
• Poultry Science

Background:

• Toll-like receptors (TLRs) are crucial for recognizing microbial invaders and initiating innate immune responses.
• The role of TLRs in chick myoblasts, essential for skeletal muscle development, remains uninvestigated.
• Understanding TLRs in myoblasts can impact poultry health and productivity.

Purpose of the Study:

• To investigate the expression patterns of Toll-like receptor (TLR) genes in primary-cultured chick myoblasts.
• To examine the ligand-dependent transcriptional responses of interleukin (IL) genes in chick myoblasts.
• To elucidate the functional role of TLRs in chick myogenic precursor cells.

Main Methods:

• Primary culture of chick myoblasts from layer and broiler breeds.
• Analysis of TLR gene expression using molecular techniques.
• Stimulation of myoblasts with specific TLR ligands (Pam3CSK4, FSL-1, LPS).
• Quantification of inflammatory interleukin (IL) gene transcription.

Main Results:

• Most TLR genes were expressed in both layer and broiler myoblasts.
• TLR1A was specifically detected in embryonic layer chick myoblasts.
• TLR1/2 ligands induced inflammatory ILs in both myoblast types.
• A TLR4 ligand (lipopolysaccharide) showed minimal induction of ILs.

Conclusions:

• This study provides the first evidence of TLR ligand-dependent inflammatory responses in chick myoblasts.
• The findings suggest TLRs play a role in immune surveillance within chick skeletal muscle precursor cells.
• Results may inform strategies for improving chicken breeding and meat production through immune modulation.