G K Iwamoto1, S A Konicek. 1. Richard L. Roudebush Veterans Administration Medical Center, Department of Medicine, Indiana University School of Medicine, Indianapolis, USA.
Abstract
BACKGROUND: The immediate early genes (IE) of human cytomegalovirus (CMV) can be expressed in monocytic cells and are known to regulate viral and cellular genes. Interleukin-6 (IL-6) plays a central role in numerous inflammatory and immune processes. Interleukin-6 levels are increased in lung transplant patients clinically diagnosed with CMV pneumonitis. The regulation of IL-6 is dependent on various stimuli that include lipopolysaccharide (LPS), viruses, and other cytokines. These studies examined the ability of CMV IE gene products to modulate IL-6 production. METHODS: THP-1 cells, a monocytic cell line, were transfected with the CMV IE genes. Interleukin-6 protein and IL-6 mRNA were measured in control and CMV immediate early transfected cells. Cotransfection of CMV IE genes and IL-6 chloramphenicol acetyl transferase (CAT) or IL-6 luciferase constructs were used to study IL-6 promoter activity. RESULTS: Interleukin-6 protein and mRNA production were significantly increased in cells transfected with the CMV IE genes and stimulated with LPS compared to LPS-stimulated control cells. Cytomegalovirus IE gene products significantly enhanced LPS stimulation of IL-6 promoter activity in both IL-6 CAT and IL-6 luciferase assays. A deletion construct that contains a NF-kappa B site but is missing the multiple response region demonstrated a continued increase in IL-6 luciferase activity in LPS-stimulated CMV transfected cells. CONCLUSION: Cytomegalovirus immediate early gene products significantly enhanced expression of IL-6 in LPS-stimulated cells. The increase in IL-6 luciferase activity occurs in the absence of the multiple response region, the area of the IL-6 promoter responsive to IL-1, TNF alpha, cyclic amp, and phorbol 12-myristate 13-acetate. The ability of CMV IE gene products to enhance IL-6 production may play an important role in immune inflammatory states associated with CMV infection.
BACKGROUND: The immediate early genes (IE) of human cytomegalovirus (CMV) can be expressed in monocytic cells and are known to regulate viral and cellular genes. Interleukin-6 (IL-6) plays a central role in numerous inflammatory and immune processes. Interleukin-6 levels are increased in lung transplant patients clinically diagnosed with CMV pneumonitis. The regulation of IL-6 is dependent on various stimuli that include lipopolysaccharide (LPS), viruses, and other cytokines. These studies examined the ability of CMV IE gene products to modulate IL-6 production. METHODS: THP-1 cells, a monocytic cell line, were transfected with the CMV IE genes. Interleukin-6 protein and IL-6 mRNA were measured in control and CMV immediate early transfected cells. Cotransfection of CMV IE genes and IL-6 chloramphenicol acetyl transferase (CAT) or IL-6 luciferase constructs were used to study IL-6 promoter activity. RESULTS:Interleukin-6 protein and mRNA production were significantly increased in cells transfected with the CMV IE genes and stimulated with LPS compared to LPS-stimulated control cells. Cytomegalovirus IE gene products significantly enhanced LPS stimulation of IL-6 promoter activity in both IL-6 CAT and IL-6 luciferase assays. A deletion construct that contains a NF-kappa B site but is missing the multiple response region demonstrated a continued increase in IL-6 luciferase activity in LPS-stimulated CMV transfected cells. CONCLUSION: Cytomegalovirus immediate early gene products significantly enhanced expression of IL-6 in LPS-stimulated cells. The increase in IL-6 luciferase activity occurs in the absence of the multiple response region, the area of the IL-6 promoter responsive to IL-1, TNF alpha, cyclic amp, and phorbol 12-myristate 13-acetate. The ability of CMV IE gene products to enhance IL-6 production may play an important role in immune inflammatory states associated with CMV infection.
Authors: James E Turner; John P Campbell; Kate M Edwards; Lauren J Howarth; Graham Pawelec; Sarah Aldred; Paul Moss; Mark T Drayson; Victoria E Burns; Jos A Bosch Journal: Age (Dordr) Date: 2013-07-12