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Effects of Morphine on Gp120-induced Neuroinflammation Under Immunocompetent Vs. Immunodeficient Conditions

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Abstract

HIV-associated neurocognitive disorder (HAND) is a common complication of HIV infection, whose development is known to be facilitated by inflammation and exacerbated by morphine. Previously, using the gp120 transgenic (tg) mouse model in combination with LP-BM5 (a murine retrovirus that can cause systemic immunodeficiency in susceptible mouse strains) we demonstrated differential gp120-associated central nervous system (CNS) neuroinflammatory responses under immunocompetent (-LP-BM5) vs. immunocompromised (+LP-BM5) conditions. Here, we further investigated the effects of morphine on gp120-associated neuroinflammatory response within the hippocampus under differential immune status. First, we confirmed that morphine treatment (2 × 25 mg pellets) did not significantly affect the development of immunodeficiency induced by LP-BM5 and all brain regions examined (hippocampus, striatum, and frontal lobe) had detectable LP-BM5 viral gag genes. Morphine notably reduced the performance of gp120tg+ mice in the alteration T-maze assay when 2-minute retention was used, regardless of LP-BM5 treatment. Morphine further enhanced GFAP expression in gp120tg+ mice regardless of host immune status, while promoted CD11b expression only in immunocompetent mice, regardless of gp120tg expression. In immunocompetent gp120tg+ mice, morphine increased the RNA expression of CCL2, CCL5, CXCL10, IL-12p40, and IFNβ; while under the immunodeficient condition, morphine downregulated the expression of CCL2, CCL5, CXCL10, IL-12p40, and IL-1β. Further, expression of TNFα and IFNγ were enhanced by morphine regardless of host immune status. Altogether, our results suggest that the effects of morphine are complex and dependent on the immune status of the host, and host immune status-specific, targeted anti-neuroinflammatory strategies are required for effective treatment of HAND.

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Acknowledgements

The authors would like to thank Dr. Marcus Kaul from the University of California Riverside, Riverside, CA, USA for kindly providing the HIV gp120tg mice for breeding at our animal facility. We also would like to thank Dr. William Green from the Dartmouth College Geisel School of Medicine, Hanover, NH for providing the original LP-BM5 viral stock. We are also grateful for the statistical help from Dr. Woon Yuen Koh from the Department of Mathematics, College of Arts and Sciences at the University of New England. This work was funded in part by NIH grants NIH/NINDS R01S098426 (PI Cao) and NIH/NIDA R21DA044886 (PI Cao).

Funding

This work was funded by NIH grant NIH/NINDS R01S098426 (PI Cao).

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Ling Cao contributed to the study conception and design, supervised the conduction of the study, and participated in data analysis and manuscript preparation. Dalton Canonico participated in data collection, statistical analysis and manuscript preparation. Sadie Casale and Tristan Look participated in data collection, data input, and reviewed the manuscript.

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Correspondence to Ling Cao.

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Canonico, D., Casale, S., Look, T. et al. Effects of Morphine on Gp120-induced Neuroinflammation Under Immunocompetent Vs. Immunodeficient Conditions. J Neuroimmune Pharmacol 18, 24–40 (2023). https://doi.org/10.1007/s11481-021-10040-5

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  • DOI: https://doi.org/10.1007/s11481-021-10040-5

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