Endocrine Abstracts

Background. The endothelial dysfunction prevalent in hypertension and diabetes is associated with an imbalance in the levels of nitric oxide (NO) and superoxide (SO). NAD(P)H oxidase is the predominant source of SO in the vasculature. Objectives. To manipulate levels of SO using the NAD(P)H oxidase inhibitors, apocynin, phenyl arsine oxide (PAO) and 4(2aminoethyl)benzenesulfonyl fluoride (AEBSF) and relate this to NO bioavailability. Methods. NO bioavailability was compared in...

Background and Hypothesis:- A common NOS3 Single nucleotide polymorphisms (SNP) (894 G/T) which encodes a Glu298Asp amino acid substitution in endothelial NO synthase has been associated with cardiovascular disorders in which NO bioactivity is impaired. The gene coding for p22phox, a critical component of the NADH/NAD(P)H oxidase enzyme system, a major source of vascular SO, is CYBA. Among the allelic polymorphisms reported in CYBA is C242T, associated wit...

Increased superoxide(SO) production reduces nitric oxide(NO) bioactivity and increases oxidative stress contributing to endothelial dysfunction in vascular disease. The gene coding for p22phox, a critical component of the NADH/NAD(P)H oxidase enzyme system which produces vascular SO, is CYBA. Among the allelic polymorphisms reported in CYBA is C242T which is associated with progression of coronary atherosclerosis. Radial applanation tonometry with pulse waveform analysis (PWA)...

Insulin-like growth factor (IGF-1) has been postulated to function as a vasodilator via a nitric oxide (NO) pathway. IGF-1/growth hormone deficiency in humans is associated with endothelial dysfunction and increased cardiovascular mortality.We compared the effects of IGF-1 on vascular function in control Wistar-Kyoto (WKY) (n=6) and stroke-prone spontaneously hypertensive rats characterised by endothelial dysfunction (SHRSP) (n=7)....

Introduction: Rapid-onset obesity with hypoventilation, hypothalamic dysfunction, autonomic dysregulation, and neuro-endocrine tumour (ROHHAD-NET) is a rare syndrome associated with high morbidity and mortality. With no clear aetiology, diagnosis is based on constellation of clinical features. Management is supportive, although various immunosuppressive agents have been used with variable benefits. We present 3 cases of ROHHAD with heterogeneous presentations and clinical feat...