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Published online before print November 7, 2005

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(Journal of Leukocyte Biology. 2006;79:330-338.)
© 2006 by Society for Leukocyte Biology

LIGHT enhances the bactericidal activity of human monocytes and neutrophils via HVEM

Sook-Kyoung Heo^*, Seong-A Ju^*, Sang-Chul Lee^*, Sang-Min Park^*, Suck-Young Choe, Byungsuk Kwon^*, Byoung S. Kwon^*, and Byung-Sam Kim^*,1

^* Immunomodulation Research Center and
Department of Food Science and Nutrition, University of Ulsan, Korea; and
Louisiana State University Eye Center, New Orleans

¹Correspondence: Immunomodulation Research Center, University of Ulsan, San 29, Mookeo-dong, Nam-ku, Ulsan, Republic of Korea, 680-749. E-mail: bskim{at}mail.ulsan.ac.kr

Human monocytes and neutrophils play major roles in clearing bacteria from human blood and tissues. We found that the herpes virus entry mediator (HVEM) was highly expressed in monocytes and neutrophils, and its interaction with "homologous to lymphotoxins, shows inducible expression, and competes with herpes simplex virus glycoprotein D for HVEM/tumor necrosis factor (TNF)-related 2" (LIGHT) enhanced bactericidal activity against Listeria monocytogenes and Staphylococcus aureus. The LIGHT-HVEM interaction increased levels of phagocytosis, interleukin (IL)-8, TNF-, nitric oxide (NO), and reactive oxygen species (ROS) in monocytes and neutrophils. Anti-HVEM monoclonal antibody was able to block LIGHT-induced bactericidal activity, cytokine production (IL-8 and TNF-), and ROS generation. Moreover, inhibition of ROS and NO production blocked LIGHT-induced bactericidal activity. Our results indicate that the LIGHT/HVEM interaction in monocytes and neutrophils contributes to antibacterial activity.

Key Words: innate immunity • inflammatory response

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