AMT hydrochloride - CAS 21463-31-0
Category: Inhibitor
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Molecular Formula:
Molecular Weight:
The hydrochloride salt form of AMT, which has been found to be a reversible inhibitor of iNOS and could probably be useful in treatment of inflammatory and autoimmune disorders.
≥95% by HPLC
White Solid
2-Amino-5,6-dihydro-6-methyl-4H-1,3-thiazine hydrochloride
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1.Role of inducible nitric oxide synthase in regulation of pulmonary vascular tone in the late gestation ovine fetus.
Rairigh RL;Le Cras TD;Ivy DD;Kinsella JP;Richter G;Horan MP;Fan ID;Abman SH J Clin Invest. 1998 Jan 1;101(1):15-21.
Nitric oxide (NO) produced by NO synthase (NOS) modulates fetal pulmonary vascular tone and contributes to the fall in pulmonary vascular resistance (PVR) at birth. Although the inducible (type II) NOS isoform is present in human and rat fetal lungs, it is uncertain whether type II NOS activity contributes to vascular NO production in the fetal lung. To determine whether type II NOS is present in the ovine fetal lung and to study the potential contribution of type II NOS on the regulation of basal PVR in the fetus, we measured the hemodynamic effects of three selective type II NOS antagonists: aminoguanidine (AG), 2-amino-5,6-dihydro-6-methyl-4H-1,3 thiazine (AMT), and S-ethylisothiourea (EIT). Studies were performed after at least 72 h of recovery from surgery in 19 chronically prepared fetal lambs (133+/-3 d; 147 d, term). Brief intrapulmonary infusions of AG (140 mg), AMT (0.12 mg), and EIT (0.12 mg) increased basal PVR by 82, 69, and 77%, respectively (P < 0.05). The maximum increase in PVR occurred within 20 min, but often persisted up to 80 min. These agents also increased mean aortic pressure but did not alter the pressure gradient between the pulmonary artery and aorta, suggesting little effect on tone of the ductus arteriosus.
2.Involvement of nitric oxide in the modulation of dural arterial blood flow in the rat.
Messlinger K;Suzuki A;Pawlak M;Zehnter A;Schmidt RF Br J Pharmacol. 2000 Apr;129(7):1397-404.
1. Nitric oxide (NO) has been proposed to be a key molecule in the pathogenesis of migraine pain and other headaches that are linked to vascular disorders. Several lines of evidence indicate that the meningeal vascularization is crucially involved in the generation of these headaches. In an experimental model in the rat a dominating role of calcitonin gene-related peptide (CGRP) in causing neurogenic vasodilatation and increased blood flow has been shown. The aim of the present study was to clarify the role of NO in this model with regard to the meningeal blood flow. 2. The blood flow in and around the medial meningeal artery (dural arterial flow) was recorded in the exposed parietal dura mater encephali of barbiturate anaesthetized rats using laser Doppler flowmetry. Local electrical stimulation of the dura mater (pulses of 0.5 ms delivered at 7.5 - 17.5 V and 5 or 10 Hz for 30 s) caused temporary increases in dural arterial flow for about 1 min that reached peaks of 1.6 - 2.6 times the basal flow. The effects of NO synthase (NOS) inhibitors on the basal flow and the electrically evoked increases in flow were examined. 3. Systemic (i. v.) administration of N(omega)-nitro-L-arginine methyl ester (L-NAME) at cumulative doses of 10 and 50 mg kg(-1) lowered the basal flow to 87 and 72%, respectively, of the control and reduced the evoked increases in blood flow to 82 and 44% on an average.
3.Pathodynamics of nitric oxide production within implanted glioma studied with an in vivo microdialysis technique and immunohistochemistry.
Oyoshi T;Nomoto M;Hirano H;Kuratsu J J Pharmacol Sci. 2003 Jan;91(1):15-22.
Nitric oxide (NO) is thought to be a mediator in many of the processes of malignant brain tumor progression. We examined NO production in the brain of normal conscious, freely moving rats with or without implanted C6 glioma. Both nitrite (NO(2)(-)) and nitrate (NO(3)(-)) in the dialysates of the two groups were measured using an in vivo microdialysis technique. The mean concentration of NO(2)(-) in the glioma group was two-times higher than that in the control group (P<0.01). Concentrations of both NO(2)(-) and NO(3)(-) in the glioma and control groups decreased following intraperitoneal injection of N(G)-nitro-L-arginine methyl ester (L-NAME), a non-selective inhibitor of NO synthase (NOS). NO production was also significantly suppressed in the glioma group, but not the control group, by intraperitoneal injection of 2-amino-5,6-dihydro-6-methyl-4H-1,3-thiazine (AMT), a selective inhibitor of inducible NOS (iNOS). On immunohistochemical examination, diffuse iNOS-positive cells were located within glioma tissue. ED1-positive cells (microglia/macrophages) were intermingled between glioma cells on double immunostaining. These results indicate that the basal level of NO production in the glioma group is higher than that in the control group and that the increased NO production was continuously induced by iNOS-expressing cells in glioma.
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CAS 21463-31-0 AMT hydrochloride

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