-
Tokuyuki Kono,
Yasuo Imai,
Takao Ichihara,
Kasumi Miyagawa,
Kiyonori Kanemitsu,
Tetsuo Ajiki,
Kentaro Kawasaki,
Takashi Kamigaki, Hajime Ikuta,
Chiho Ohbayashi,
Hiroshi Yokozaki,
Takahiro Fujimori,
Yoshikazu Kuroda
[show abstract]
[hide abstract]
ABSTRACT: A 54-year-old man, found to have a submucosal tumor in the stomach by double contrast roentgenography, endoscopy, and endoscopic ultrasonography, underwent a laparoscopic partial gastrectomy. The pathological examination revealed that the lesion, measuring 45 mm x 35 mm, was an inverted hyperplastic polyp (IHP) located in the submucosal layer and consisting mostly of columnar cells resembling foveolar epithelium and pyloric gland cells. Notably, adenocarcinoma with adjacent dysplasia was observed in the submucosal glands. Transition from hyperplasia to dysplasia and from dysplasia to adenocarcinoma was noted. The adenocarcinoma component was intensely and diffusely positive for p53 overexpression, while the dysplasia component showed only weak and focal positivity, suggesting a role of p53 mutation in the dysplasia-carcinoma sequence. Gastric IHP is very rare, and only 31 cases (in 29 patients) have been reported. Five of these IHPs coexisted with gastric adenocarcinomas, which had all developed separately from the IHP lesions. Therefore, this is the first case of adenocarcinoma arising within gastric IHP itself.
Pathology - Research and Practice 02/2007; 203(1):53-6. · 1.21 Impact Factor
-
Ryoko Takeno,
Yasuhiko Okimura,
Genzo Iguchi,
Masahiko Kishimoto,
Takumi Kudo,
Kentaro Takahashi,
Yutaka Takahashi,
Hidesuke Kaji,
Masakazu Ohno, Hajime Ikuta,
Yoshikazu Kuroda,
Tetsuji Obara,
Hiroshi Hosoda,
Kenji Kangawa,
Kazuo Chihara
[show abstract]
[hide abstract]
ABSTRACT: Ghrelin is a potent peptide stimulating GH secretion. Besides its direct action on the pituitary, ghrelin has been reported to stimulate GH release via the vagal afferent nerve in rats. To examine the involvement of vagal nerve in ghrelin-induced GH secretion in humans, GH responses to ghrelin were compared between vagotomized patients with gastrectomy and normal subjects.
Ghrelin (0.2 microg/kg) or GHRH (1 microg/kg) was administered intravenously in vagotomized patients and normal subjects on separate days, and plasma GH responses to the stimuli were examined.
Ghrelin caused a significant plasma GH rise in both vagotomized patients and normal subjects. Peak GH levels in vagotomized patients (37.5+/-16.9 ng/ml) were not different from those in normal subjects (29.9+/-23.1 ng/ml). The areas under the curve of GH response to ghrelin did not differ between the two groups. GHRH also increased GH levels, and peak GH levels and areas under the curve after GHRH stimulation were also comparable between vagotomized patients and normal subjects.
In the present study, the involvement of the afferent vagal nerve in ghrelin-induced GH secretion was not confirmed in humans.
European Journal of Endocrinology 11/2004; 151(4):447-50. · 3.42 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The purpose of this study was to assess the antitumor effects of cisplatin-loaded microspheres (CDDP-MS) and the efficacy of the administration of CDDP-MS into the mediastinum.
To evaluate the antitumor effect, we first performed a paratumoral injection of CDDP-MS to FF6 tumor-bearing DA rats to compare its effect with that of the intraperitoneal injection of a CDDP solution at different doses.
In the CDDP-MS groups the tumor growth was effectively delayed in proportion to the dosage of CDDP-MS. All rats treated with the CDDP solution at a dose of 10 mg/kg died within 1 week, while no rats treated with CDDP-MS even at a CDDP dose of 20 mg/kg were lost. In the second experiment, which was designed to determine the delivery of the microspheres-released CDDP to various organs, CDDP-MS was injected directly into the mediastinum via the diaphragm in male Wistar rats. In the CDDP-MS group, the plasma CDDP concentration stayed significantly lower than that in the CDDP solution (intravenous) group while the tissue CDDP concentration in the paratracheal lymph nodes was higher. Moreover, the lymph node-to-kidney platinum ratio was eight times higher in the rats given CDDP-MS intramediastinally than in those given the CDDP solution intravenously.
These results demonstrate that a high dose of CDDP can be administered with less systemic side effects by means of encapsulation in the microspheres, and that the administration of CDDP-MS into the mediastinum is more effective for delivering CDDP to the paratracheal lymph nodes. As a regional chemotherapy after esophageal cancer operation, the injection of CDDP-MS into the mediastinum for targeting of the lymph nodes thus promises to be an effective treatment.
Surgery Today 02/2002; 32(4):335-42. · 1.22 Impact Factor
