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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Abbreviations
- ABAH:
-
4-Aminobenzoic acid hydrazide
- AG:
-
Aminoguanidine
- AA:
-
Arachidonic acid
- CPA:
-
Cyclopiazonic acid
- DCFDA:
-
2′,7′Dichlorodihydrofluorescein diacetate
- DHR:
-
Dihydrorhodamine-123
- DAF:
-
4,5-Diaminofluorescein diacetate
- 4–400:
-
Dowex 50WX
- 1077 and 1119:
-
Histopaque
- LPS:
-
Lipopolysacharide
- 7NI:
-
7-Nitroindazole
- L-NAME:
-
L-Nitroarginine methyl ester
- TMB-8:
-
8-(N.N-Diethylamino) octyl 3,4,5-trimethyl benzoate
- PMA:
-
Phorbol myristate acetate
- SOD:
-
Superoxide dismutase
- OZ:
-
Opsonised zymosan
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Dikshit, M., Sharma, P. (2003). Nitric oxide mediated modulation of free radical generation response in the rat polymorphonuclear leukocytes: A flowcytometric study. In: Sobti, R.C., Krishan, A. (eds) Advanced Flow Cytometry: Applications in Biological Research. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0623-0_11
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DOI: https://doi.org/10.1007/978-94-017-0623-0_11
Publisher Name: Springer, Dordrecht
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