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Nitric oxide inhibits wound collagen synthesis

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Abstract

Nitric oxide (NO) is a messenger molecule which regulates many physiological functions like immunity, vascular tone and serves as a neurotransmitter. Although it is known to participate in healing process, its role in collagen synthesis is not clear. Therefore, the present investigation was done to study the role of NO in wound collagen synthesis. Rats received full thickness, circular (8 mm), transdermal wounds which were treated with NO releaser, sodium nitroprusside (SNP, 0.001 100 μM) topically for 5 days. Wound collagen content estimated in terms of hydroxyproline (HP) and confirmed histochemically was decreased significantly by all SNP doses. L-Arginine, a substrate for nitric oxide synthase (NOS) when applied topically decreased collagen content of the wounded tissues. N-Nitro-L-arginine methyl ester (L-NAME), a competitive inhibitor of NOS, increased wound collagen content significantly as compared to untreated and SNP treated animal wounds when administered intraperitoneally at the doses 3, 10 and 30 mg/kg. Furthermore, histological findings also demonstrated laying down of thick collagen bundles and proliferation of fibroblasts together with prominent angiogenesis in L-NAME treated wound tissues as compared to untreated and SNP treated tissues. N-nitro-D-arginine methyl ester, an inactive isomer, was found to have no effect on wound collagen levels. When L-arginine was administered in L-NAME pretreated rats, it significantly elevated wound HP content. The results indicate that NO plays an important role in regulating the collagen biosynthesis in skin model of a healing wound.

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Authors and Affiliations

  1. Pharmacology Division, Central Drug Research Institute, Lucknow, India

    Arti Shukla & Anamika M. Rasik

  2. Industrial Toxicology Research Center, Lucknow, India

    Ravi Shankar

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  1. Arti Shukla
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  2. Anamika M. Rasik
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Shukla, A., Rasik, A.M. & Shankar, R. Nitric oxide inhibits wound collagen synthesis. Mol Cell Biochem 200, 27–33 (1999). https://doi.org/10.1023/A:1006977513146

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