Serveur d'exploration Hippolyte Bernheim

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Identification of Friend murine retrovirus‐infected immune cells and studies of the effects of sex and steroid hormones in the early phase of infection

Identifieur interne : 000566 ( Main/Exploration ); précédent : 000565; suivant : 000567

Identification of Friend murine retrovirus‐infected immune cells and studies of the effects of sex and steroid hormones in the early phase of infection

Auteurs : Torunn Bruland [Norvège] ; Liss Anne S. Lavik [Norvège] ; Hong Yan Dai [Norvège] ; Are Dalen [Norvège]

Source :

RBID : ISTEX:B2D40C018DD129D4E1989F9B1951D1D9C4694F66

English descriptors

Abstract

Male mice are more susceptible than female mice to the murine retrovirus FIS‐2. We previously reported that sex‐related factors influence early virus replication via mechanisms involving a glucocorticoid response element (GRE) in the long terminal repeat (LTR) enhancer region. In the present study, we investigated further the influence of sex and steroid hormones on early murine retrovirus dissemination and immune functions. In male mice we found a correlation between an early expansion of the CD8+ cell subset and rapid infection of lymphocytes, including CD8+ cells. Virus load in blood declined faster in females than in males, and the postpeak declines coincided with more rapidly generation of antibodies against virus‐positive cells. Moreover, female‐derived T‐cells responded better to in vitro mitogen stimuli than male‐derived T‐cells. Physiological concentrations of progesterone and dexamethasone induced a dose‐dependent inhibition of T‐cell proliferation. Administration of progestin in vivo did not modify early FIS‐2 production in female mice. Male castrated mice, who were notably less involved in aggressive behaviour and fighting compared to male control mice, had a significant delay of virus dissemination. We suggest that testosterone‐dependent aggression, with successive enhanced stress hormone levels, may influence both FIS‐2 replication and immune responses during infection.

Url:
DOI: 10.1034/j.1600-0463.2003.1110906.x


Affiliations:


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<term>Castrated</term>
<term>Castrated mice</term>
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<term>Cell population</term>
<term>Cell subset</term>
<term>Cell subsets</term>
<term>Cell types</term>
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<term>Clone igg1</term>
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<term>Days postinoculation</term>
<term>Dead cells</term>
<term>Depomedroxyprogesterone acetate</term>
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<term>Detection limit</term>
<term>Dexamethasone</term>
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<term>Early dissemination rate</term>
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<term>Early murine retrovirus infection</term>
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<term>Female nmri mice</term>
<term>Friend murine</term>
<term>Friend murine leukaemia virus variant</term>
<term>Friend murine leukemia virus</term>
<term>Friend virus</term>
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<term>Present study</term>
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<div type="abstract" xml:lang="en">Male mice are more susceptible than female mice to the murine retrovirus FIS‐2. We previously reported that sex‐related factors influence early virus replication via mechanisms involving a glucocorticoid response element (GRE) in the long terminal repeat (LTR) enhancer region. In the present study, we investigated further the influence of sex and steroid hormones on early murine retrovirus dissemination and immune functions. In male mice we found a correlation between an early expansion of the CD8+ cell subset and rapid infection of lymphocytes, including CD8+ cells. Virus load in blood declined faster in females than in males, and the postpeak declines coincided with more rapidly generation of antibodies against virus‐positive cells. Moreover, female‐derived T‐cells responded better to in vitro mitogen stimuli than male‐derived T‐cells. Physiological concentrations of progesterone and dexamethasone induced a dose‐dependent inhibition of T‐cell proliferation. Administration of progestin in vivo did not modify early FIS‐2 production in female mice. Male castrated mice, who were notably less involved in aggressive behaviour and fighting compared to male control mice, had a significant delay of virus dissemination. We suggest that testosterone‐dependent aggression, with successive enhanced stress hormone levels, may influence both FIS‐2 replication and immune responses during infection.</div>
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