Abstract
HIV protease inhibitors (PI) are fundamental to combination antiretroviral therapy, which has revolutionized HIV clinical care and produced significant reductions in HIV-associated morbidity and mortality. However, PI administration is frequently associated with severe metabolic impairment, including lipodystrophy, dyslipidemia, and insulin resistance; all of which can contribute to cardiovascular and neurologic co-morbidities. Experimental and epidemiological data support a potentially important role for the adipokine adiponectin in both metabolic and neurologic physiology. This study examined if ADP355, a novel, peptide-based adiponectin receptor agonist, could neutralize the detrimental effects of PI treatment in experimental animal models. Adult male C57BL/6 mice were subjected to a clinically relevant, 4-week regimen of lopinavir/ritonavir, with daily injections of ADP355 administered only during the final 2 weeks of PI exposure. Comprehensive metabolic, neurobehavioral, and biochemical analyses revealed that ADP355 administration partially reversed PI-induced loss of subcutaneous adipose tissue, attenuated PI-induced hyperinsulinemia, hypertriglyceridemia, and hypoadiponectinemia, and prevented PI-induced cognitive impairment and brain injury. Collectively, these data reinforce the link between metabolic co-morbidities and cognitive impairment and suggest that pharmacological reactivation of adiponectin pathways could remediate key aspects of PI-induced metabolic syndrome in clinical settings. Furthermore, therapeutic targeting of adiponectin receptors could show utility in reducing the prevalence and/or severity of HIV-associated neurocognitive disorders.
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Acknowledgments
The authors are grateful to Dr. Barry Robert for expert veterinary assistance related to lopinavir/ritonavir administration, and also thank Prof. John Wade (Florey Neuroscience Institutes, Melbourne, Australia) for peptide synthesis. This work was supported by a grant from the NIH (MH099944), and also used PBRC Core facilities (Animal Phenotyping) that are funded by the NIH (P20-RR021945 and P30-DK072476).
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Supplemental Figure 1
ADP355 does not affect circulating serum resistin or retroperitoneal fat in PI-treated mice. Male C57BL/6 mice were given daily administration of 10 % ethanol/15 % propylene glycol (vehicle; left bars) or 150 mg lopinavir/37.5 mg ritonavir/kg (PI; right bars) for 28 days. Additionally, randomly selected vehicle (open bars) and PI-treated mice (hatched bars) mice were also treated daily with ADP355 (1 mg/kg) or PBS via intraperitoneal injection for the final 14 days of PI exposure, after which all mice were euthanatized and serum and adipose deposits were harvested. (A) Effects of lopinavir/ritonavir with or without ADP355 on serum resistin concentration. Data are means ± S.E.M. of resistin expressed as ng/μl serum, and were analyzed by 1-way ANOVA, but significant differences between groups were not found. (B) Effects of lopinavir/ritonavir with or without ADP355 on retroperitoneal fat depot weight in vehicle and lopinavir/ritonavir-treated mice following administration of PBS or ADP355. * indicates significant (p < 0.05) decreases in weight of the retroperitoneal fat depot in lopinavir/ritonavir/PBS and lopinavir/ritonavir/ADP355 mice as compared to vehicle-treated mice, respectively (PDF 33 kb)
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Pepping, J.K., Otvos, L., Surmacz, E. et al. Designer Adiponectin Receptor Agonist Stabilizes Metabolic Function and Prevents Brain Injury Caused by HIV Protease Inhibitors. J Neuroimmune Pharmacol 9, 388–398 (2014). https://doi.org/10.1007/s11481-014-9529-1
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DOI: https://doi.org/10.1007/s11481-014-9529-1