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Nitric oxide mediated modulation of free radical generation response in the rat polymorphonuclear leukocytes: A flowcytometric study

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Methods in Cell Science

Abstract

Nitric oxide (NO) synthesis and free radical generation from polymorphonuclear leukocytes (PMNs) play an important role in several pathological conditions. It is therefore important to understand the regulatory mechanisms of free radical generation from PMNs. Flowcytometry can be used to assess generation of reactive oxygen and nitrogen species from PMNs by using fluorescent probes. In the present study regulation of NO synthesis in the control and lipopolysaccharide (LPS) treated rat PMNs has been investigated. Free radical generation was assessed by flow cytometry using a dye, 2′7′-dichlorodihydrofluorescein diacetate (DCFDA), dihydrorhodamine-123 (DHR) and 4,5-diaminofluorescein diacetate (DAF). Superoxide dismutase (SOD), and catalase significantly attenuated the arachidonic acid (AA, 1 × 10−6 M) induced free radical generation, while 4-aminobenzoicacid hydrazide (ABH), myeloperoxidase (MPO) inhibitor had no significant effect. Intracellular and extracellular calcium levels also modulated FR generation. AA induced free radical generation from PMNs was also enhanced significantly after LPS treatment. NO synthase (NOS) inhibitors, aminoguanidine (AG) and 7-nitroindazole (NI) inhibited arachidonic acid induced free radical generation from LPS treated PMNs, while in control PMNs NOS inhibition had no effect. Augmentation of free radical generation from rat PMNs following LPS treatment seems to be regulated by NO.

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Authors and Affiliations

  1. Division of Pharmacology, Central Drug Research Institute, Lucknow-, 226001, India

    Madhu Dikshit & Prashant Sharma

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  1. Madhu Dikshit
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  2. Prashant Sharma
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Dikshit, M., Sharma, P. Nitric oxide mediated modulation of free radical generation response in the rat polymorphonuclear leukocytes: A flowcytometric study. Methods Cell Sci 24, 69–76 (2002). https://doi.org/10.1023/A:1024197915723

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