AJP - Regulatory, Integrative and Comparative Physiology, Vol 268, Issue 1 78-R84, Copyright © 1995 by American Physiological Society

ARTICLES

Cytokines and the acute phase response to influenza virus in mice

C. A. Conn, J. L. McClellan, H. F. Maassab, C. W. Smitka, J. A. Majde and M. J. Kluger
Institute for Basic and Applied Medical Research, Lovelace Institutes, Albuquerque, New Mexico 87108.

This study characterized selected aspects of the acute phase response after intranasal inoculation of mice with two doses of mouse-adapted influenza virus differing in lethality. Mice given 140 plaque-forming units (PFU) of virus (58% survival) gradually decreased food and water intake to nearly zero over 6 days; survivors then slowly increased intakes. Declines in these behaviors were parallel to decreases in body temperature and general locomotor activity and were associated with elevated activities of interleukin-6 (IL-6), tumor necrosis factor-alpha, and interferons in lung lavage fluid. Circulating levels of these cytokines were not increased. After 55,000 PFU of virus (100% mortality), food and water intake fell to near zero within 48 h, temperature and locomotor activity decreased significantly, and activities of IL-1 and IL-6 were elevated in lung lavage fluid. These data show that cytokine activities in the lungs are elevated in a time frame that supports the hypothesis that cytokines could mediate behavioral and physiological changes in mice during acute influenza infections.

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