Shin Hasegawa

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Although the orexigenic action of peptide hormones such as ghrelin and growth hormone releasing peptide is different between chickens and mammals, the anorexigenic action of peptide hormones is similar in both species. For example, central administration of peptide hormones such as leptin, cholecystokinin or glucagon has been shown to suppress food intake(More)
Glucagon-like peptide-1 (GLP-1), structurally similar to glucagon, synthesized from the precursor proglucagon, is a well known anorexigenic peptide in the brain of several animal species. However, there are no previous reports concerning GLP-1-containing neurons in the chick brain. The aim of the present study was to investigate the distribution of(More)
Food intake in chickens is regulated in a manner similar to that in mammals. Corticotropin-releasing factor (CRF), which increases the plasma corticosterone concentration, plays an important role as a mediator of many appetite-suppressive peptides in the central nervous system in both species. Central administration of glucagon suppresses food intake in(More)
The appetite-suppressive action of brain-gut peptides is similar in both chickens and mammals. In mammals, the brain-gut peptide neuromedin U (NMU) suppresses food intake via hypothalamic neuropeptides, corticotropin-releasing factor (CRF), oxytocin, and arginine-vasopressin. In chickens, central administration of CRF, oxytocin, or arginine-vasotocin (AVT,(More)
A virtual reality environment to visualize and manipulate 3D spatial human heart model and catheter in real-time was developed recently to interact with actual catheter to conduct electrocardiogram simulations. Since in the captured images, the catheter is loop-crossing, irregularly shaped, and often broken by the myocardium, it is difficult to catch the(More)
Proopiomelanocortin (POMC, a precursor of melanocortin peptides) neurons in the hypothalamus play an important role in the central regulation of food intake in mammals. There is evidence that human melanocortin peptides alpha-, beta- and gamma2-melanocyte-stimulating hormone (α-, β- and γ2-MSH) significantly decreased food intake in chickens. However, the(More)
The present study was carried out to investigate whether the hypothalamus is involved in the anorexic effect of glucagon-like peptide-1 (GLP-1) in chicks. To examine this, Fos expression in the chick hypothalamus were immunohistochemically detected after intracerebroventricular (ICV) injection of 30-pmol GLP-1. ICV injection of GLP-1 stimulated the(More)
A virtual reality environment to visualize and manipulate catheter-based electrophysiology study (EPS) and catheter ablation is under development in our lab. This paper presents a project developing a shader for virtual X-ray imaging. One of main technical issues is how to visualize the motion of catheters within a 3D heart model as an actual X-ray camera(More)