Reprogramming of lysosomal gene expression by interleukin-4 and Stat6

Area of Science:

• Cell Biology
• Immunology
• Molecular Biology

Background:

• Lysosomes are crucial for cellular physiology, but the coordination of lysosomal gene transcription is not fully understood.
• Identifying regulators of lysosomal genes is essential for understanding cellular processes.

Purpose of the Study:

• To uncover physiological contexts of coordinated lysosomal gene regulation.
• To identify transcription factors controlling lysosomal gene expression.

Main Methods:

• Meta-analysis of gene expression data to find correlations between transcription factors and lysosomal genes.
• Analysis of chromatin immunoprecipitation data to identify Stat6-bound targets.
• Gene expression quantification in wild-type and Stat6-deficient macrophages.

Main Results:

• Stat6, activated by IL-4/IL-13, was identified as a top regulator of lysosomal genes.
• Lysosomal genes are enriched among Stat6-bound targets in macrophages.
• Stat6 promotes the expression of over 100 lysosomal genes, including hydrolases and vacuolar H+ ATPase subunits, and mediates IL-4's activating effects.

Conclusions:

• Stat6 is a significant regulator of lysosomal gene expression in mouse macrophages.
• Lysosome function is frequently reprogrammed during differentiation, development, and interferon signaling, involving various regulators.