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Published on: February 13, 2018
Kv7 channel modulation by 4-hydroxycinnamic acid in experimental diabetic neuropathy
Feyza Alyu Altinok1, Muhammet Burak Acıkgul2, Yusuf Burak3
1Department of Pharmacology, Faculty of Pharmacy, Anadolu University, 26210 Eskisehir, Turkey.
Aims:
This study evaluates the impacts of p-coumaric acid in the challenging condition of diabetic neuropathy, within a focus on Kv7 channel-mediated mechanisms.
Methods:
Rats were rendered diabetic by intravenous STZ (50 mg/kg, n = 8). p-Coumaric acid (25, 50, or 100 mg/kg) was given per oral for 28 days. Behavioral testing included von Frey and Hargreaves assays. Blood glucose levels were measured at multiple time points. Primary dorsal root ganglion neurons were collected and utilized for whole-cell patch-clamp recordings to assess M-type (Kv7) K+ currents. RT-PCR was utilized to quantify KCNQ2 and KCNQ5 mRNA expressions.
Key Findings:
p-Coumaric acid dose-dependently lowered blood glucose, with the 50 mg/kg group providing optimal effect. All doses significantly altered mechanical and thermal hypersensitivity. At 50 mg/kg, it increased M-type K+ current density and amplitude and enhanced Kv7 activation. RT-PCR revealed increased channel mRNA expressions.
Conclusions:
p-Coumaric acid dose-dependently reduces hyperglycemia, alters allodynia and hyperalgesia, and enhances M-type Kv7 function in dorsal root ganglion neurons. By enhancing Kv7 current density, activation, and mRNA expressions, it was associated with changes in Kv7 channel activity that may influence neuronal excitability. These findings suggest that the metabolic and electrophysiological effects of PCA, including its potential modulation of Kv7-related mechanisms, warrant further investigation in diabetic neuropathy.
Significance Statement:
This study shows that p-coumaric acid alters diabetic neuropathic pain by enhancing Kv7 channel function in sensory neurons, highlighting Kv7 modulation as a key mechanism in peripheral nerve excitability and a potential therapeutic target.
Insights
p-Coumaric acid effectively reduced diabetic neuropathy symptoms and blood glucose levels in rats. The compound enhanced Kv7 channel function, suggesting a new therapeutic avenue for nerve pain.
Area of Science:
- Neuroscience
- Pharmacology
- Endocrinology
Background:
- Diabetic neuropathy is a significant complication of diabetes, characterized by pain and nerve dysfunction.
- Kv7 (potassium voltage-gated channel subfamily 7) channels play a crucial role in regulating neuronal excitability.
Purpose of the Study:
- To investigate the therapeutic potential of p-coumaric acid (PCA) in diabetic neuropathy.
- To elucidate the role of Kv7 channel mechanisms in PCA's effects.
Main Methods:
- Diabetic neuropathy was induced in rats using streptozotocin (STZ).
- Rats were treated with varying doses of p-coumaric acid (PCA) for 28 days.
- Behavioral tests (von Frey, Hargreaves) assessed pain, blood glucose was monitored, and dorsal root ganglion (DRG) neurons were analyzed using patch-clamp electrophysiology and RT-PCR for Kv7 channel expression (KCNQ2, KCNQ5).
Main Results:
- PCA administration dose-dependently reduced blood glucose levels and improved mechanical and thermal hypersensitivity.
- The optimal dose (50 mg/kg) significantly increased M-type Kv7 K+ current density and amplitude in DRG neurons.
- RT-PCR indicated elevated KCNQ2 and KCNQ5 mRNA expression following PCA treatment.
Conclusions:
- P-coumaric acid demonstrates efficacy in managing hyperglycemia and neuropathic pain associated with diabetes.
- PCA enhances M-type Kv7 channel function in sensory neurons by increasing current density, activation, and gene expression.
- These findings highlight Kv7 channel modulation as a key mechanism underlying PCA's therapeutic effects in diabetic neuropathy, suggesting potential as a novel treatment target.
