Exosome markers associated with immune activation and oxidative stress in HIV patients on antiretroviral therapy.

TitleExosome markers associated with immune activation and oxidative stress in HIV patients on antiretroviral therapy.
Publication TypeJournal Article
Year of Publication2018
AuthorsChettimada, S, Lorenz, DR, Misra, V, Dillon, ST, R Reeves, K, Manickam, C, Morgello, S, Kirk, GD, Mehta, SH, Gabuzda, D
JournalSci Rep
Volume8
Issue1
Pagination7227
Date Published05/2018
ISSN2045-2322
KeywordsInternal
Abstract

Exosomes are nanovesicles released from most cell types including immune cells. Prior studies suggest exosomes play a role in HIV pathogenesis, but little is known about exosome cargo in relation to immune responses and oxidative stress. Here, we characterize plasma exosomes in HIV patients and their relationship to immunological and oxidative stress markers. Plasma exosome fractions were isolated from HIV-positive subjects on ART with suppressed viral load and HIV-negative controls. Exosomes were characterized by electron microscopy, nanoparticle tracking, immunoblotting, and LC-MS/MS proteomics. Plasma exosomes were increased in HIV-positive subjects compared to controls, and correlated with increased oxidative stress markers (cystine, oxidized cys-gly) and decreased PUFA (DHA, EPA, DPA). Untargeted proteomics detected markers of exosomes (CD9, CD63, CD81), immune activation (CD14, CRP, HLA-A, HLA-B), oxidative stress (CAT, PRDX1, PRDX2, TXN), and Notch4 in plasma exosomes. Exosomal Notch4 was increased in HIV-positive subjects versus controls and correlated with immune activation markers. Treatment of THP-1 monocytic cells with patient-derived exosomes induced expression of genes related to interferon responses and immune activation. These results suggest that exosomes in ART-treated HIV patients carry proteins related to immune activation and oxidative stress, have immunomodulatory effects on myeloid cells, and may have pro-inflammatory and redox effects during pathogenesis.

DOI10.1038/s41598-018-25515-4
Alternate JournalSci Rep
PubMed ID29740045
PubMed Central IDPMC5940833
Grant ListU24 MH100929 / MH / NIMH NIH HHS / United States
U24 MH100925 / MH / NIMH NIH HHS / United States
U24 MH100931 / MH / NIMH NIH HHS / United States
U01 DA023832 / DA / NIDA NIH HHS / United States
U24 MH100928 / MH / NIMH NIH HHS / United States
R01 DA004334 / DA / NIDA NIH HHS / United States
R01 DA030985 / DA / NIDA NIH HHS / United States
R01 DA040391 / DA / NIDA NIH HHS / United States
R01 DA012568 / DA / NIDA NIH HHS / United States
U24 MH100930 / MH / NIMH NIH HHS / United States