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Abstract

Research Article

Neuroprotective Effect of 7,8-dihydroxyflavone in a Mouse Model of HIV-Associated Neurocognitive Disorder (HAND)

Tapas K Makar, Joseph Bryant, Bosung Shim, Kaspar Keledjian, Harry Davis, Manik Ghosh, Ajay Koirala, Ishani Ghosh, Shreya Makar, Alonso Heredia, Malcolm Lane, J Marc Simard, Robert C Gallo, Volodymyr Gerzanich* and Istvan Merchenthaler*

Published: 18 September, 2024 | Volume 8 - Issue 2 | Pages: 090-105

Treatment for HIV-associated neurocognitive disorders (HAND) remains elusive. 7,8-dihydroxyflavone (DHF), an analog of brain-derived neurotrophic factor (BDNF) and a high-affinity TrkB agonist, has been proposed as a viable therapeutic alternative to BDNF in crossing the Blood-Brain Barrier (BBB) and promoting growth, differentiation, maintenance, and survival of neurons. Here, we expand on our previous study investigating the therapeutic role of DHF on the cortical and hippocampal brain regions of the Tg26 mice, an animal model of HAND. We detected increased immunoreactivity for ion channels (SUR1, TRPM4) and the water channel aquaporin-4 (AQP4), suggesting an ionic and osmotic imbalance in the brains of Tg26 mice. Tg26 mice also exhibited loss of synaptic stability (SYN, SYP) and nicotinamide metabolism (NAMPT, SIRT1) that were associated with astrogliosis. Furthermore, Tg26 mice demonstrated increased iNOS and reduced HO-1/NRF2 expressions, implicating increased ER and oxidative stress. DHF treatment in Tg26 mice reversed these pathological changes. These data suggest crosstalk among TrkB, Akt, and related transcription factors (NF-κB, STAT3, and NRF2) as an underlying mechanism of Tg26-associated pathology in the brain. Finally, taken together with our prior study, these results further highlight a therapeutic role of DHF in promoting neuroprotection in HAND that may be applied in conjunction with current antiviral therapies.

Read Full Article HTML DOI: 10.29328/journal.jnnd.1001101 Cite this Article Read Full Article PDF

Keywords:

HAND; BDNF; TrkB; DHF; Transgenic; Transgenic mice-Tg26; Neurodegeneration; Neuroprotection; Antioxidant; Oxidative stress

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