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The mechanism of poly I:C-induced antiviral activity in peritoneal macrophage
1College of Pharmacy, SungKyunKwan University, Suwon, Korea.
Abstract:
Macrophages play an important role in defense against virus infection by intrinsic resistance and by extrinsic resistance. Since interferon-induced enzymes which are 2'-5' oligoadenylate synthetase and P1/eIF-2 protein kinase have been shown to be involved in the inhibition of viral replication, I examined the mechanism by which poly I:C, an interferon inducer, exerts its antiviral effects in inflammatory macrophages infected with herpes simplex virus type 1 (HSV-1). The data presented here demonstrate that poly I:C-induced antiviral activity is partially due to the activation of 2'-5' oligoadenylate synthetase. The activation of 2'-5' oligoadenylate A synthetase by poly I:C is also at least partly mediated via the production of interferon-beta. Taken together, these data indicate that interferon-beta produced in response to poly I:C acts in an autocrine manner to activate the 2'-5' oligoadenylate synthetase and to induce resistance to HSV-1.
Insights
Polyinosinic:polycytidylic acid (poly I:C) enhances antiviral defense in macrophages against herpes simplex virus type 1 (HSV-1). This involves interferon-beta production, which activates 2’-5’ oligoadenylate synthetase for viral resistance.
Area of Science:
- Immunology
- Virology
- Molecular Biology
Background:
- Macrophages are crucial for antiviral defense through intrinsic and extrinsic resistance mechanisms.
- Interferon-induced enzymes, 2'-5' oligoadenylate synthetase and P1/eIF-2 protein kinase, are known to inhibit viral replication.
Purpose of the Study:
- To investigate the mechanism of polyinosinic:polycytidylic acid (poly I:C)-induced antiviral effects in inflammatory macrophages infected with herpes simplex virus type 1 (HSV-1).
- To elucidate the role of interferon-beta and 2'-5' oligoadenylate synthetase activation in this process.
Main Methods:
- Treatment of inflammatory macrophages with poly I:C.
- Infection of macrophages with herpes simplex virus type 1 (HSV-1).
- Measurement of 2'-5' oligoadenylate synthetase activity and interferon-beta production.
Main Results:
- Poly I:C treatment led to partial activation of 2'-5' oligoadenylate synthetase.
- Poly I:C-induced activation of 2'-5' oligoadenylate synthetase was mediated, in part, by interferon-beta production.
- Interferon-beta acted in an autocrine manner to activate 2'-5' oligoadenylate synthetase.
Conclusions:
- Interferon-beta produced in response to poly I:C is a key mediator of antiviral activity in macrophages.
- The autocrine action of interferon-beta activates 2'-5' oligoadenylate synthetase, conferring resistance to HSV-1 infection.