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Current Drug Metabolism


ISSN (Print): 1389-2002
ISSN (Online): 1875-5453

Research Article

Pain Allaying Epalrestat-Loaded Lipid Nanoformulation for the Diabetic Neuropathic Pain Interventions: Design, Development, and Animal Study

Author(s): Vishal Kumar Vishwakarma, Shravan Kumar Paswan, Taruna Arora, Rahul Kumar Verma and Harlokesh Narayan Yadav*

Volume 23, Issue 7, 2022

Published on: 23 August, 2022

Page: [571 - 583] Pages: 13

DOI: 10.2174/1389200223666220810152633

Price: $65


Background: Diabetic peripheral neuropathy is the most common complication of diabetes mellitus. Epalrestat, an aldose reductase inhibitor, has been approved for clinical therapy for diabetic peripheral neuropathic pain. In the present study, solid lipid-based nanoparticles are used for oral administration of epalrestat (E-SLN) and evaluated against diabetic neuropathic pain in a rat model.

Methods: Experimental diabetes in rats was induced by a single dose of streptozotocin (STZ) administration. The therapeutic efficiency of Epalrestat nanoparticles (0.25, 0.50, 1, and 5 mg/kg) in diabetic rats was studied. STZinduced diabetic rats were treated with different doses of E-SLN for 8 weeks. The nanoparticles were orally administered at a single dose in rats, and the various parameters related to peripheral neuropathy were evaluated and compared with the bare drug. The blood glucose level was estimated by standard glucometer, HbA1c, triglycerides, total cholesterol, and liver function test (ALT and AST) were analyzed by blood samples collected from retro-orbital plexus. Oxidative stress markers and Na+K+ATPase, TNF-α, and IL-1β levels were measured in the homogenate of sciatic nerves. Behavioral tests were also performed by the hot plate method and tail-flick method.

Results: E-SLN synthesized by the micro-emulsification method was 281 ± 60 nm in size, and encapsulation efficacy was found to be 88 ± 2%. Optimized E-SLN were characterized and found to be optimum in size, spherical shape, decent encapsulation efficiency, stable at acidic gastric pH, and suitable for oral delivery. E-SLNs did not significantly reverse the STZ-induced elevated blood glucose level (FBS and PPBS), HbA1c, triglycerides, and total cholesterol but significantly improved TNF-α, IL-1β, and increased Na+K+ATPase levels, oxidative stress marker and ALT, AST in the treated rat group as compared with the diabetic group. Doses of E-SLN, i.e. 0.5, 1.0, 2.5, and 5 mg/kg, significantly increased the tail-flick latency time and hot plate response time in a dose-dependent manner compared with the diabetic group.

Conclusion: Thus, it is suggested that E-SLN were equally effective and less hepatotoxic compared with the standard treatment of epalrestat. To the best of our knowledge, we, for the first time, propose the orally deliverable E-SLN that ameliorates STZ-induced diabetes neuropathic pain effectively as compared with conventional epalrestat.

Keywords: Diabetes mellitus, solid lipid nanoparticles, diabetic neuropathy, wistar rats, epalrestat, hyperglycemia.

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