Inhibition of T-cell responses in tumor microenvironments by myeloid-derived suppressor cells (MDSCs) is widely accepted. We demonstrated augmentation of monocytic MDSCs whose suppression of not only T-cell, but also B-cell, responsiveness paralleled the immunodeficiency during LP-BM5 retrovirus infection. MDSCs inhibited T cells by inducible nitric oxide synthase (iNOS)/nitric oxide (NO), but ...

Inducible nitric oxide synthase (iNOS) helps drive numerous inflammatory disorders, but its inhibition has not had therapeutic success. Now Seimetz et al. (2011) make a case for inhibiting iNOS in an effort to treat one of the world's leading causes of death-chronic obstructive pulmonary disease.

The present study was designed to investigate the inhibitory effect of 2,4 bis-[(4-ethoxyphenyl)azo] 5-(3-hydroxybenzylidene) thiazolidine-2,4-dione (TZD-OCH2CH3) on the cyclo-oxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) in RAW 264.7 cells. The effects of TZD-OCH2CH3 on COX-2 and iNOS mRNA expression in LPS-activated RAW 264.7 cells ...

objective(s):the neuropeptide calcitonin gene-related peptide (cgrp) has long been postulated to play an integral role in the pathophysiology of migraine. earlier studies showed that cgrp can stimulate the synthesis and release of nitric oxide (no) and cytokines from trigeminal ganglion glial cells. the purpose of this study was to determine the effect of 17β-estradiol in regulation of cgrp exp...

Inducible nitric oxide (NO) synthase (iNOS)-mediated hyperproduction of NO in airways has been reported in asthmatic patients. However, the role of NO in the pathogenesis of asthma has not yet been fully elucidated. The aim of this study was to examine whether the iNOS-derived NO affects airway microvascular leakage, one of the characteristic features of asthmatic airway inflammation. Guinea-pi...

Asfaha, Samuel, Cameron J. Bell, John L. Wallace, and Wallace K. MacNaughton. Prolonged colonic epithelial hyporesponsiveness after colitis: role of inducible nitric oxide synthase. Am. J. Physiol. 276 (Gastrointest. Liver Physiol. 39): G703–G710, 1999.—Colonic epithelial secretion is an important host defense mechanism. We examined whether a bout of colitis would produce long-lasting changes i...

nitric oxide (no) is thought to be involved in spatial learning and memory in several brain areas such as hippocampus. this study examined the effects of post-training intrahippocampal microinjections of 1400w as a selective inducible nitric oxide synthase (inos) inhibitor on spatial memory, in both anesthetized and non-anesthetized situations in rats. in the present work, 4-day training trials...

Cytokines and bacterial lipopolysaccharides (LPSs) stimulate nitric oxide production in macrophages by inducing transcription of the gene coding for the inducible isoform of nitric oxide synthase (iNOS). We have cloned the mouse iNOS gene promoter and analysed its structural features and its response to interferon-gamma (IFN-gamma) and Escherichia coli LPS in RAW 264.7 mouse macrophage-like cel...

In retinal organ cultures, H2O2 can be used to simulate oxidative stress, which plays a role in the development of several diseases including glaucoma. We investigated whether processes underlying stress prevented cultures by an inducible nitric oxide synthase (iNOS)-inhibitor. To this end, porcine explants were cultivated for four and eight days. Oxidative was induced via 300 µM on day one thr...