Obesity is associated with macrophage accumulation in adipose tissue
2003/12/15 by Stuart P. Weisberg, Daniel McCann, Manisha Desai +3 · 94 citations
Immunology and Microbiology · Medicine · #Adipocyte #Adipokines, Inflammation, and Metabolic Diseases #Adipose Tissue and Metabolism #Adipose tissue #Adipose tissue macrophages #Biochemistry #Biology #CD68 #Endocrinology #Immune Cell Function and Interaction #Immunohistochemistry #Inflammation #Internal medicine #Macrophage #Medicine #Proinflammatory cytokine #White adipose tissue
paper · pdf · doi:10.1172/jci200319246
openalex publication_date 2003/12/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract
Obesity alters adipose tissue metabolic and endocrine function and leads to an increased release of fatty acids, hormones, and proinflammatory molecules that contribute to obesity associated complications. To further characterize the changes that occur in adipose tissue with increasing adiposity, we profiled transcript expression in perigonadal adipose tissue from groups of mice in which adiposity varied due to sex, diet, and the obesity-related mutations agouti (A y ) and obese (Lep ob ). We found that the expression of 1,304 transcripts correlated significantly with body mass. Of the 100 most significantly correlated genes, 30% encoded proteins that are characteristic of macrophages and are positively correlated with body mass. Immunohistochemical analysis of perigonadal, perirenal, mesenteric, and subcutaneous adipose tissue revealed that the percentage of cells expressing the macrophage marker F4/80 (F4/80 + ) was significantly and positively correlated with both adipocyte size and body mass. Similar relationships were found in human subcutaneous adipose tissue stained for the macrophage antigen CD68. Bone marrow transplant studies and quantitation of macrophage number in adipose tissue from macrophage-deficient (Csf1 op/op ) mice suggest that these F4/80 + cells are CSF-1 dependent, bone marrow-derived adipose tissue macrophages. Expression analysis of macrophage and nonmacrophage cell populations isolated from adipose tissue demonstrates that adipose tissue macrophages are responsible for almost all adipose tissue TNF- expression and significant amounts of iNOS and IL-6 expression. Adipose tissue macrophage numbers increase in obesity and participate in inflammatory pathways that are activated in adipose tissues of obese individuals.
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