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Dive into the research topics where Hiroshi Sonobe is active.

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Featured researches published by Hiroshi Sonobe.


Medical electron microscopy : official journal of the Clinical Electron Microscopy Society of Japan | 1999

Ultrastructure of Kaposi's sarcoma-associated herpesvirus (KSHV)/human herpesvirus-8 (HHV-8) in a primary effusion lymphoma cell line treated with tetradecanoyl phorbol acetate (TPA).

Yuji Ohtsuki; Jun Iwata; Mutsuo Furihata; Tamotsu Takeuchi; Hiroshi Sonobe; Isao Miyoshi; J. Iwata; Tetsuo Takeuchi; H. Sonobe; I. Miyoshi

The ultrastructure of Kaposis sarcoma-associated herpesvirus (KSHV)/human herpesvirus-8 (HHV-8) has not yet been fully elucidated, although some findings have been reported using primary effusion lymphoma (PEL) cell lines, KS-1, harboring no Epstein–Barr virus (EBV) coinfection. In the present study, detailed fine structural examination of KSHV/HHV-8 was performed after stimulation of the PEL-derived cell line KS-1 with 12-O-tetradecanoyl-phorbol-13-acetate (TPA) in vitro. While unstimulated KS-1 cells contained a small number of intranuclear virus particles associated with no extracellular mature particles, KS-1 cells stimulated with TPA produced many extracellular mature particles as well as intranuclear particles, in addition to interesting tubulo-reticular structures and aggregated tubular structures in vesicles. The induced intranuclear particles were empty, doughnut shaped, and dense cored, with outer and inner diameters of 100–110 nm and 60–70 nm, respectively. Dense-cored extracellular mature particles were 150–160 nm in diameter, and some contained doughnut-shaped cores, together with a few megaloviruses, 260 nm in outer diameter. These findings indicate that KS-1 cells treated with TPA can produce extracellular mature particles as well as intranuclear particles, which were proven to be KSHV/HHV-8.


Pathology International | 1996

Granular cell tumor expressing myogenic markers in the prostate

Mutsuo Furihata; Hiroshi Sonobe; Jun Iwata; Eiji Ido; Yuji Ohtsuki; Morimasa Kuwahara; Nobuta Fujisaki

A granular cell tumor in the prostate of a 72 year old male is reported. The tumor nest was composed of large polygonal tumor cells, possessing cytoplasmlc eoslnophlllc granules which were positive with PAS stain and resistant to diastase digestion. Immunohistochemically, most tumor cells were strongly positive with anti‐α‐smooth muscle actin and ‐neuron specific enolase antibodies. Only a few scattered tumor cells were reacted with antt‐S‐100 protein antibody. These find‐Ings might suggest smooth muscle differentiation of this case, and provide an additional Insight into the histogenesis of granular cell tumors, especially In their heterogeneity.


The Journal of the Japanese Society of Clinical Cytology | 1995

A successful ultrastructural observation of herpes virusinfected cells in the specimen of sputum smear cytology.

Yuji Ohtsuki; Shunichi Manabe; Hiroshi Sonobe; Yuhei Okada; Shoichiro Sutoh; Junko Isshiki; Katsuhito Kubo; Takeo Yoshinouchi

基礎疾患のない66歳の男性で発熱・悪寒に対する薬物投与により白血球が著減し (300/mm3), G-CSFとステロイドのパルス療法で改善した症例において, 第12病日の喀痰細胞診にて特徴的なヘルペスウイルス (HV) 感染細胞が見出された. 光顕的には, 単~多核なスリガラス状を呈する腫大核を有する細胞で, 多核なものは鋳型状を示していた。パパニコロー染色喀痰塗抹試料をグルタールアルデハイドと四酸化オスミュームで二重固定後, エポン包埋し, これら特徴的な細胞を直接電顕的に観察した. 微細構造の保存は不良であったが, 単~多核なものいずれにも腫大した核内には疎ないし一部密に分布する80~100nm径の核内粒子を認め, 胞体内には150~200nm径の粒子が小胞体内や空胞内に認められた. また, これら感染細胞には接着斑や密な胞体内微細線維が見出され扁平上皮性格を示していた.以上パパニコロー染色が施された喀痰塗抹試料内のHV感染細胞の直接的な電顕観察によりHVとして矛盾しない核内・胞体内ウイルス粒子を証明し得た1例を報告した. このような塗抹試料内のウイルス粒子を直接電顕的に証明する方法は診断確定に有用であると考えられた.


The Journal of the Japanese Society of Clinical Cytology | 1990

Cytological findings of a case of osteoclastoid type giant cell carcinoma in the pancreas.

Yuji Ohtsuki; Shunichi Manabe; Hiroshi Sonobe; Yuhei Okada; Katsuhiko Kawai; Hidekazu Nakagawa; Koichi Nishihara

われわれは転移を認めた膵の類破骨細胞型巨細胞癌症例の捺印細胞, 免疫細胞学的ならびに走査電顕所見について検索したので報告する.症例は71歳女性で, 昭和63年10月末に閉塞性黄疸のため入院し, 胆嚢・膵頭部に腫瘍が見出された. 手術材料では, 径5×5.5cm大の膵頭部腫瘍, 径3cm大の胆嚢腫瘍ならびに総胆管周囲リンパ節腫大を認めた. いずれも灰白ないし赤褐色で壊死を伴っており, 境界は比較的明瞭であった. 捺印細胞所見は膵と胆嚢腫瘍は同様で, 胞体豊富な多核細胞と単核細胞が認められ, 明瞭な核小体を有し, 核質は明るい. 多核巨細胞は, 破骨細胞に類似していた. S-100蛋白α亜分画抗体とMB+抗体が多核巨細胞胞体に陽性であった. 走査電顕所見では, 大型から小型のものが区別され, 核に対応する部での陥凹や表面にPitsを認め, 互いに不規則な突起をのばして混在していた.これらの所見は, 病理組織学的検索結果に支持された膵の類破骨細胞型巨細胞癌の捺印細胞像であり, 本腫瘍はまれではあるが, 通常の巨細胞癌に比し予後はよく, 特徴的な所見を有しているので, 膵十二指腸部腫瘍の診断に際して十分に留意すべき疾患と考える.


Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 2000

An Early Diagnosed Case of Adenoendocrine Cell Carcinoma of the Gallbladder.

Tatsuhiro Ishii; Hiroki Jyohira; Ryohei Watanabe; Katsusuke Ohmori; Nobuhiro Miyata; Hiroshi Sonobe; Yuji Ohtsuki


The Journal of the Japanese Society of Clinical Cytology | 1996

A case of thyroglossal duct cyst combined with papillary carcinoma.

Yuji Ohtsuki; Shunichi Manabe; Jun Iwata; Hiroshi Sonobe; Yuhei Okada; Shoichiro Sudo; Katsusuke Ohmori


The Journal of the Japanese Society of Clinical Cytology | 2001

Gluteal pleomorphic rhabdomyosarcoma with intraabdominal metastasis. A case report.

Eiji Ohhara; Tamotsu Takahashi; Shousuke Ueta; Miko Mitani; Toshiaki Moriki; Naoto Kuroda; Hiroshi Sonobe; Yuji Ohtsuki


Archive | 1999

Overexpression of c-Met Protein in Human Thyroid Tumors Correlated with Lymph Node Metastasis and Cl

Bing-Kun Chen; Yuji Ohtsuki; Mutsuo Furihata; Tamotsu Takeuchi; Jun Iwata; Sheng-Ben Liang; Hiroshi Sonobe


The Journal of the Japanese Society of Clinical Cytology | 1997

A case of pemphigus vulgaris arising in the epiglottis.

Masayo Wada; Toshiaki Moriki; Tamotsu Takahashi; Shousuke Ueta; Hiroshi Sonobe


The Journal of the Japanese Society of Clinical Cytology | 1996

A case of epithelioid sarcoma arising in the perineum. Imprint cytological study.

Naomi Yamamoto; Hiroshi Sonobe; Shunichi Manabe; Chiaki Yoshikawa; Yuji Ohtsuki

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Yuji Ohtsuki

Kyoto Prefectural University of Medicine

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Yuji Ohtsuki

Kyoto Prefectural University of Medicine

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Sheng-Ben Liang

Ontario Institute for Cancer Research

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