Journal
IMMUNOLOGIC RESEARCH
Volume 64, Issue 3, Pages 653-664Publisher
HUMANA PRESS INC
DOI: 10.1007/s12026-015-8783-5
Keywords
Complement activation; C5b-9; RGC-32; Adipose tissue; Metabolic syndrome; Diabetes mellitus
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Funding
- Veterans Administration Merit Award [BX001458]
- POSDRU Grant [159/1.5/S/138776]
- Iuliu Hatieganu'' University of Medicine and Pharmacy of Cluj-Napoca, Romania [1495/8/28.01.2014]
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As the common factor linking adipose tissue to the metabolic context of obesity, insulin resistance and atherosclerosis are associated with a low-grade chronic inflammatory status, to which the complement system is an important contributor. Adipose tissue synthesizes complement proteins and is a target of complement activation. C3a-desArg/acylation-stimulating protein stimulates lipogenesis and affects lipid metabolism. The C3a receptor and C5aR are involved in the development of adipocytes' insulin resistance through macrophage infiltration and the activation of adipose tissue. The terminal complement pathway has been found to be instrumental in promoting hyperglycemia-associated tissue damage, which is characteristic of the major vascular complications of diabetes mellitus and diabetic ketoacidosis. As a mediator of the effects of the terminal complement complex C5b-9, RGC-32 has an impact on energy expenditure as well as lipid and glucose metabolic homeostasis. All of this evidence, taken together, indicates an important role for complement activation in metabolic diseases.
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