Back to Search
Start Over
Neuroprotective and anti-human immunodeficiency virus activity of minocycline.
- Source :
-
JAMA [JAMA] 2005 Apr 27; Vol. 293 (16), pp. 2003-11. - Publication Year :
- 2005
-
Abstract
- Context: The prevalence of human immunodeficiency virus (HIV) central nervous system (CNS) disease has not decreased despite highly active antiretroviral therapy. Current antiretroviral drugs are expensive, have significant adverse effects including neurotoxicity, and few cross the blood-brain barrier.<br />Objective: To examine the ability of minocycline, an antibiotic with potent anti-inflammatory and neuroprotective properties, to protect against encephalitis and neurodegeneration using a rapid, high viral load simian immunodeficiency virus (SIV) model of HIV-associated CNS disease that constitutes a rigorous in vivo test for potential therapeutics.<br />Design and Subjects: Five SIV-infected pigtailed macaques were treated with 4 mg/kg per day of minocycline beginning at early asymptomatic infection (21 days after inoculation). Another 6 macaques were inoculated with SIV but remained untreated. Blood and cerebrospinal fluid (CSF) samples were taken on days 7, 10, 14, 21, 28, 35, 43, 56, 70, 77, and 84, and all macaques were humanely killed at 84 days after inoculation, a time that corresponds to late-stage infection in HIV-infected individuals.<br />Main Outcome Measures: Blood and CSF samples were tested for viral load by real-time reverse transcription-polymerase chain reaction and levels of monocyte chemoattractant protein 1 were quantitated by enzyme-linked immunosorbent assay. The presence and severity of encephalitis was determined by microscopic examination of tissues. Central nervous system inflammation was further assessed by measuring infiltration and activation of macrophages, activation of p38 mitogen-activated protein kinase and expression of amyloid precursor protein by quantitative immunohistochemistry.<br />Results: Minocycline-treated macaques had less severe encephalitis (P = .02), reduced CNS expression of neuroinflammatory markers (major histocompatibility complex class II, P = .03; macrophage marker CD68 , P = .07; T-cell intracytoplasmic antigen 1, P = .03; CSF monocyte chemoattractant protein 1, P = .001), reduced activation of p38 mitogen-activated protein kinase (P<.001), less axonal degeneration (beta-amyloid precursor protein, P = .03), and lower CNS virus replication (viral RNA, P = .04; viral antigen, P = .04). In in vitro analysis, minocycline suppression of HIV and SIV replication in cultured primary macrophages did not correlate with suppression of activation of p38-mitogen-activated protein kinase pathways, whereas suppression in primary lymphocytes correlated with suppression of p38 activation.<br />Conclusions: In this experimental SIV model of HIV CNS disease, minocycline reduced the severity of encephalitis, suppressed viral load in the brain, and decreased the expression of CNS inflammatory markers. In vitro, minocycline inhibited SIV and HIV replication. These findings suggest that minocycline, a safe, inexpensive, and readily available antibiotic should be investigated as an anti-HIV therapeutic.
- Subjects :
- AIDS Dementia Complex metabolism
AIDS Dementia Complex pathology
Animals
Biomarkers metabolism
Cells, Cultured
Central Nervous System metabolism
Central Nervous System pathology
Central Nervous System virology
Chemokine CCL2 metabolism
Disease Models, Animal
Encephalitis, Viral metabolism
Encephalitis, Viral pathology
Lymphocytes metabolism
Lymphocytes virology
Macaca nemestrina
Macrophages metabolism
Macrophages virology
Simian Acquired Immunodeficiency Syndrome metabolism
Simian Acquired Immunodeficiency Syndrome pathology
Viral Load
p38 Mitogen-Activated Protein Kinases metabolism
AIDS Dementia Complex prevention & control
Anti-Bacterial Agents pharmacology
Anti-Inflammatory Agents pharmacology
Encephalitis, Viral drug therapy
HIV drug effects
Minocycline pharmacology
Neuroprotective Agents pharmacology
Simian Acquired Immunodeficiency Syndrome drug therapy
Simian Immunodeficiency Virus drug effects
Virus Replication drug effects
Subjects
Details
- Language :
- English
- ISSN :
- 1538-3598
- Volume :
- 293
- Issue :
- 16
- Database :
- MEDLINE
- Journal :
- JAMA
- Publication Type :
- Academic Journal
- Accession number :
- 15855434
- Full Text :
- https://doi.org/10.1001/jama.293.16.2003