RASSF6 expression in adipocytes is down-regulated by interaction with macrophages

Area of Science:

• Metabolic disease research
• Adipose tissue biology
• Immunology

Background:

• Macrophage infiltration into adipose tissue is linked to obesity and inflammation.
• The interaction between adipocytes and macrophages is a key pathological process in adipose tissue inflammation.

Purpose of the Study:

• To identify adipocyte messenger RNAs (mRNAs) regulated by macrophage interaction in vivo.
• To investigate the role of vitamin B6 in modulating these interactions and gene expression profiles.

Main Methods:

• Gene expression analysis in obese mice (db/db) with and without vitamin B6 supplementation.
• In vitro studies using 3T3-L1 adipocytes and RAW264.7 macrophages.
• Correlation analysis between mRNA levels and macrophage infiltration in adipose tissue.

Main Results:

• Over 3500 genes were altered during obesity development; vitamin B6 supplementation modulated these changes.
• PTX3 and MMP3 mRNA expression in adipocytes was upregulated by activated macrophages and correlated with macrophage numbers.
• RASSF6 mRNA expression in adipocytes was downregulated by activated macrophages and negatively correlated with macrophage numbers.
• Decreased RASSF6 expression led to increased expression of CD44 and HMGA2.

Conclusions:

• Macrophage infiltration significantly alters adipocyte mRNA expression, influencing obesity pathogenesis.
• PTX3, MMP3, and RASSF6 are key genes regulated by adipocyte-macrophage crosstalk in adipose tissue.
• Vitamin B6 shows potential in modulating adipose tissue inflammation by affecting these cellular interactions and gene expressions.