The gaseous molecule hydrogen sulfide (H(2)S) has been proposed as an endogenous signal molecule and neuromodulator in mammals. Using a newly developed method, we report here for the first time the ability of intact and living brain and colonic tissue in the mouse to generate and release H(2)S. This production occurs through the activity of two enzymes, cystathionine-gamma-lyase and cystathioni...

An o-fluorinated-azido-capped rhodamine probe can react with H2S efficiently and selectively to give large off-on fluorescence enhancement. The probe was used to develop an assay for cystathionine β-synthase acitivity and for in situ visualization of endogenously produced H2S in living cells.

An elevated plasma level of homocysteine is a risk factor for the development of cardiovascular disease. The purpose of this study was to investigate the effect of glucagon on homocysteine metabolism in the rat. Male Sprague-Dawley rats were treated with 4 mg/kg/day (3 injections per day) glucagon for 2 days while control rats received vehicle injections. Glucagon treatment resulted in a 30% de...

The intracellular localization of several aspartate pathway enzymes has been studied in pea (Pisum sativum cv Feltham First) and barley (Hordeum vulgare cv Julia) leaves. Protoplast lysates were fractionated by differential or sucrose density gradient centrifugation, in media optimized for each enzyme. The results show that aspartate kinase, homoserine kinase, threonine synthase, and cystathion...

recent years, it has become clear that hydrogen sulphide (H2S) plays a number of biological roles and may function as a novel gasotransmitter in the body alongside nitric oxide (NO) and carbon monoxide (CO) [1]. H2S is synthesized naturally from L-cysteine in mammalian tissues in a reaction catalysed by two enzymes, cys-tathionine-␥-lyase (CSE) and cystathionine-␤-synthetase (CBS) [2]. Recently...

Atherosclerotic cardiovascular disease is the major cause of morbidity and mortality in diabetes (1). Atherosclerosis occurs earlier and with greater severity in the population with diabetes, leading to a much higher risk of myocardial infarction, stroke, and limb ischemia and amputation. Although numerous factors contribute to the etiology of atherosclerosis, oxidative stress and inflammation ...

BACKGROUND Downregulation of the hydrogen sulfide (H2S)-producing enzymes cystathionine-γ-lyase (CSE), cystathionine-β-synthase (CBS), and/or 3-mercaptopyruvate sulfurtransferase (3-MST) is associated with chronic cardiovascular pathologies. Nevertheless, equivocal data are available on both the expression and function of these enzymes in coronary arteries (CA). We recently reported that athero...

The aim of the present study was to determine the role of hydrogen sulfide (H2S) in improving myocardial fibrosis and its effects on oxidative stress, endoplasmic reticulum (ER) stress and cell apoptosis in diabetic rats, by regulating the Janus kinase̸signal transducer and activator of transcription (JAK̸STAT) signaling pathway. A total of 40 male Sprague‑Dawley rats were randomly divided into f...