A rodent model of HIV protease inhibitor indinavir induced peripheral neuropathy
File(s)00006396-900000000-99415.pdf (3.27 MB)
Accepted version
Author(s)
Huang, W
Calvo, M
Pheby, T
Bennett, DL
Rice, AS
Type
Journal Article
Abstract
HIV-associated sensory neuropathy (HIV-SN) is the most frequent manifestation of HIV disease. It often presents with significant neuropathic pain and is associated with previous exposure to neurotoxic nucleoside reverse transcriptase inhibitors. However, HIV-SN prevalence remains high even in resource-rich settings where these drugs are no longer used. Previous evidence suggests that exposure to indinavir, a protease inhibitor commonly used in antiretroviral therapy, may link to elevated HIV-SN risk. Here we investigated whether indinavir treatment was associated with the development of a "dying back" axonal neuropathy and changes in pain-relevant limb withdrawal and thigmotactic behaviours. Following two intravenous injections of indinavir (50 mg/kg, 4 days apart), adult rats developed hindpaw mechanical hypersensitivity, which peaked around 2 weeks post first injection (44% reduction from baseline). At this time, animals also had 1) significantly changed thigmotactic behaviour (62% reduction in central zone entries) comparing to the controls and 2) a significant reduction (45%) in hindpaw intraepidermal nerve fibre density. Treatment with gabapentin, but not amitriptyline, was associated with a complete attenuation of hindpaw mechanical hypersensitivity observed with indinavir treatment. Furthermore, we found a small but significant increase in microglia with the effector morphology in the lumbar spinal dorsal horn in indinavir-treated animals, coupled with significantly increased expression of phospho-p38 in microglia. In summary, we have reported neuropathic pain-related sensory and behavioural changes accompanied by a significant loss of hindpaw skin sensory innervation in a rat model of indinavir-induced peripheral neuropathy that is suitable for further pathophysiological investigation and preclinical evaluation of novel analgesics.
Date Issued
2016-09-23
Date Acceptance
2016-09-01
Citation
Pain, 2016, 158, pp.75-85
ISSN
1872-6623
Publisher
Wolters Kluwer
Start Page
75
End Page
85
Journal / Book Title
Pain
Volume
158
Copyright Statement
© 2016 Wolters Kluwer Health, Inc. All rights reserved. This is the accepted version of an article published in final form at http://dx.doi.org/10.1097/j.pain.0000000000000727.
Sponsor
Astellas Pharma Europe B.V
Grant Number
AG2013/3347
Subjects
Science & Technology
Life Sciences & Biomedicine
Anesthesiology
Clinical Neurology
Neurosciences
Neurosciences & Neurology
HIV
Peripheral
Neuropathy
Neuropathic pain
Rat
Indinavir
Thigmotaxis
NERVE-FIBER DENSITY
SENSORY NEUROPATHY
RISK-FACTORS
PAINFUL NEUROPATHY
INFLAMMATORY PAIN
SKIN BIOPSY
RAT MODEL
BEHAVIOR
ANXIETY
HYPERSENSITIVITY
11 Medical And Health Sciences
17 Psychology And Cognitive Sciences
Publication Status
Published