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Interleukin-6 and retroperitoneal fibromatosis from SRV-2-infected macaques with simian AIDS
S T Roodman1, M D Woon, J W Hoffmann
1Department of Pathology, St. Louis University School of Medicine, MO 63104.
Abstract:
We investigated the role of Interleukin-6 (IL-6) as an autocrine growth factor for the retroperitoneal fibromatosis (RF) cells present in macaques infected with the simian retrovirus type 2 (SRV-2). Elevated levels of IL-6 were found in serum of SRV-2 antibody-positive macaques, ascites from RF-positive animals, and RF cell line culture media. IL-6 mRNA levels increased approximately five-fold in RF cells incubated with exogenous SRV-2. In RF cells, SRV-2 functions to increase IL-6 mRNA and protein production and presumably serves as autocrine growth factor.
Insights
Interleukin-6 (IL-6) acts as an autocrine growth factor in macaques with simian retrovirus type 2 (SRV-2) infection. SRV-2 increases IL-6 production in retroperitoneal fibromatosis cells, promoting tumor growth.
Area of Science:
- Virology
- Immunology
- Oncology
Background:
- Simian retrovirus type 2 (SRV-2) infection in macaques is associated with retroperitoneal fibromatosis (RF).
- The role of Interleukin-6 (IL-6) in the pathogenesis of SRV-2-induced RF is not fully understood.
Purpose of the Study:
- To investigate the role of IL-6 as an autocrine growth factor for RF cells in SRV-2 infected macaques.
- To determine the effect of SRV-2 on IL-6 production in RF cells.
Main Methods:
- Quantification of IL-6 levels in serum, ascites, and cell culture media.
- Measurement of IL-6 mRNA and protein expression in RF cells.
- Incubation of RF cells with exogenous SRV-2.
Main Results:
- Elevated IL-6 levels were detected in serum and ascites of SRV-2 infected macaques with RF.
- IL-6 mRNA levels increased significantly in RF cells exposed to SRV-2.
- SRV-2 was shown to enhance both IL-6 mRNA and protein production in RF cells.
Conclusions:
- Interleukin-6 (IL-6) functions as an autocrine growth factor for retroperitoneal fibromatosis (RF) cells in macaques infected with simian retrovirus type 2 (SRV-2).
- SRV-2 infection stimulates IL-6 production, contributing to the development and progression of RF.