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Journal of Virology, April 1999, p. 3418-3423, Vol. 73, No. 4
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Role for Gamma Interferon in Control of Herpes Simplex Virus Type 1 Reactivation

Edouard Cantin,1,2,* Becky Tanamachi,2,dagger and Harry Openshaw2

Beckman Research Institute1 and Department of Neurology,2 City of Hope National Medical Center, Duarte, California 91010-3012

Received 23 September 1998/Accepted 8 December 1998

Observation of chronic inflammatory cells and associated high-level gamma interferon (IFN-gamma ) production in ganglia during herpes simplex type 1 (HSV-1) latent infection in mice (E. M. Cantin, D. R. Hinton, J. Chen, and H. Openshaw, J. Virol. 69:4898-4905, 1995) prompted studies to determine a role of IFN-gamma in maintaining latency. Mice lacking IFN-gamma (GKO mice) or the IFN-gamma receptor (RGKO mice) were inoculated with HSV-1, and the course of the infection was compared with that in IFN-gamma -competent mice with the same genetic background (129/Sv//Ev mice). A time course study showed no significant difference in trigeminal ganglionic viral titers or the timing of establishment of latency. Spontaneous reactivation resulting in infectious virus in the ganglion did not occur during latency in any of the mice. However, 24 h after the application of hyperthermic stress to mice, HSV-1 antigens were detected in multiple neurons in the null mutant mice but in only a single neuron in the 129/Sv//Ev control mice. Mononuclear inflammatory cells clustered tightly around these reactivating neurons, and by 48 h, immunostaining was present in satellite cells as well. The incidence of hyperthermia-induced reactivation as determined by recovery of infectious virus from ganglia was significantly higher in the null mutant than in control mice: 11% in 129/Sv//Ev controls, 50% in GKO mice (P = 0.0002), and 33% in RGKO mice (P = 0.03). We concluded that IFN-gamma is not involved in the induction of reactivation but rather contributes to rapid suppression of HSV once it is reactivated.

* Corresponding author. Mailing address: City of Hope National Medical Center, Department of Neurology, 1500 E. Duarte Rd., Duarte, CA 91010. Phone: (626) 301-8480. Fax: (626) 301-8852. E-mail: ecantin{at}.coh.org.

dagger Present address: Harbor UCLA REI Division of Medical Genetics, Torrance, CA 90502.

Journal of Virology, April 1999, p. 3418-3423, Vol. 73, No. 4
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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