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Infection and Immunity, June 1999, p. 2951-2956, Vol. 67, No. 6
0019-9567/99/$04.00+0

Lipid Extract of Mycoplasma penetrans Proteinase K-Digested Lipid-Associated Membrane Proteins Rapidly Activates NF-kappa B and Activator Protein 1

Shaw-Huey Feng,* and Shyh-Ching Lo

American Registry of Pathology, Department of Infectious and Parasitic Disease Pathology, Armed Forces Institute of Pathology, Washington, D.C. 20306

Received 29 October 1998/Returned for modification 4 January 1999/Accepted 26 March 1999

Lipid-associated membrane proteins (LAMPs) of Mycoplasma penetrans rapidly induced macrophages to produce proinflammatory cytokines such as tumor necrosis factor alpha (TNF-alpha ). Our analysis showed that the macrophage-stimulating activity of TNF-alpha production was mainly attributable to a lipid extractable component(s) in the LAMP preparation. Since induction of gene expression is normally preceded by activation of transcriptional factors that bind to their specific recognition elements located in the upstream promoter region, we examined the activity of transcriptional factors, namely, NF-kappa B and activator protein 1 (AP-1), in thioglycolate exudate peritoneal (TEP) macrophages treated with M. penetrans lipid extract of proteinase K (PK)-digested LAMPs. Initially, in the nuclei of unstimulated TEP cells, there was only a low basal level of active AP-1, and the active form of NF-kappa B could not be detected. M. penetrans lipid extract of PK-digested LAMPs activated both NF-kappa B and AP-1 in TEP macrophages within 15 min. The markedly increased activities of both factors gradually declined and dissipated after 2 h. Parallel to the rapid increase of NF-kappa B and AP-1, the TNF-alpha transcript also increased significantly 15 min after the stimulation. The high-level expression of TNF-alpha persisted over 2 h. Dexamethasone blocked the activation of both NF-kappa B and AP-1 and suppressed the production of TNF-alpha in TEP macrophages stimulated by M. penetrans lipid extract of PK-digested LAMPs. Our study demonstrates that the M. penetrans lipid extract of PK-digested LAMP is a potent activator for NF-kappa B and AP-1 in murine TEP macrophages. Our results also suggest that high-level expression of TNF-alpha in cells induced by M. penetrans lipid extract of PK-digested LAMPs is associated with rapid activation of transcriptional factors NF-kappa B and AP-1.

* Corresponding author. Mailing address: Room 4101, Department of Infectious and Parasitic Disease Pathology, Armed Forces Institute of Pathology, 14th St. and Alaska Ave., N.W., Washington, DC 20306. Phone: (202) 782-1871. Fax: (202) 782-7164. E-mail: feng{at}afip.osd.mil.

Infection and Immunity, June 1999, p. 2951-2956, Vol. 67, No. 6
0019-9567/99/$04.00+0


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