[Electron microscopic studies in piebaldism: report of two cases].
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Child↗
Biomedical subjects
J Kitajima
Publications and source records attributed to J Kitajima.
One-stage procedure using a digitorum brevis muscle flap for reconstruction of a surgical defect after excision of malignant melanoma in the heel.
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Aged↗
Sequential production of Birbeck granules through adsorptive pinocytosis.
A case of vitiligo with inflammatory raised borders was observed electron microscopically, resulting in an interesting view of the formation of Birbeck granules in Langerhans cells. Following the formation of larger coated vesicles, which perform adsorptive pinocytosis from the cell membrane, membrane invagination of the cell occurred shown as the tubular infolding, resulting in the observation of the characteristic Birbeck granule band pattern in its interior. This phenomenon supports the theory of Hashimoto and Tarnowski (1968) that Birbeck granules are formed from the infolding of the cell membrane. In addition, our study shows the involvement of adsorptive pinocytosis in the formation of the granules. It was suggested that when the coated Birbeck granule shifts into the cell, possibly its coat is detached and the vesicle portion forms the globule of the Birbeck granule.
Adult↗
[Production of Birbeck's granules associated with coated vesicle formation in endocytosis].
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Adult↗
Antitumor activity of an antibiotic identical with or closely related to xanthomycin A.
An antibiotic, identical with or closely related to xanthomycin A, was isolated from a soil Streptomyces. The antibiotic displayed significant therapeutic activity by i.p. administration against i.p.-implanted mouse tumors: Ehrlich carcinoma, sarcoma 180 and P388 leukemia. Less therapeutic activity was observed by i.p. injection in mice bearing s.c. solid tumors of Ehrlich carcinoma and sarcoma 180. No significant activity was found against L1210 leukemia, B16 melanoma and Lewis lung carcinoma. In vitro the antibiotic exhibited a potent cytotoxicity to human leukemia K562 and mouse lymphoblastoma L5178Y cells. DNA strand scission of PM2 phage was caused by the antibiotic in the presence of dithiothreitol.
Animals↗