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Dive into the research topics where Yoshihiro Ikemoto is active.

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Featured researches published by Yoshihiro Ikemoto.


Gastroenterologia Japonica | 1985

Studies on the effects of estrogen onIn Vitro antibody production in autoimmune liver diseases, including lupoid hepatitis and primary biliary cirrhosis

Yasuhiro Mizoguchi; Yoshihiro Ikemoto; Sukeo Yamamoto; Seiji Morisawa

SummaryAntibody-forming cells produced by adding trinitrophenylated sheep red blood cells (TNP-SRBC) were induced, when peripheral blood mononuclear cells from normal individuals and patients with autoimmune liver diseases, including lupoid hepatitis and primary biliary cirrhosis, were stimulatedin vitro with pokeweed mitogen (PWM). Although antibody responses were significantly augmented by adding estrogen simultaneously with PWM to mononuclear cell cultures prepared from normal individuals and autoimmune liver diseases patients, a significant difference was observed according to the concentrations of estrogen between the normal subjects and patients.These observations suggest that a different responsiveness to the different concentrations of estrogen underlines the immunological abnormalities involved in autoimmune liver diseases, including lupoid hepatitis and primary biliary cirrhosis.


Gastroenterologia Japonica | 1985

Studies on the effects of estrogen on antibody responses in asymptomatic HB virus carriers and non-responders to HB vaccine inoculation.

Yasuhiro Mizoguchi; Yoshihiro Ikemoto; Sukeo Yamamoto; Seiji Morisawa

SummaryAntibody-forming cells against trinitrophenylated sheep red blood cells (TNP-SRBC) were induced to similar extents, when peripheral blood mononuclear cells from normal individuals, non-responders to HB vaccine inoculation and asymptomatic HBV carriers were stimulated in vitro with pokeweed mitogen (PWM). Although these antibody responses were significantly augmented by adding estrogen simultaneously with PWM to mononuclear cell cultures prepared from normal individuals, no such augmentation was demonstrable in cultures from asymptomatic HBV carriers and non-responders to HB vaccine inoculation. Interleukin-1 production and DNA synthesis in PWM and PHA-stimulated mononuclear cells were also increased by estrogen in normal individuals, but not in the other two groups. These observations suggest that asymptomatic HBV carriers and non-responders to HB vaccine inoculation share a similar deficiency, not found in normal subjects, with regard to the modulatory effects of estrogen.


Kanzo | 1985

Effect of glucagon on galactose tolerance test in regenerating rat liver.

Shoichi Suemori; Eiichi Takezaki; Hiroiku Kawakami; Yoshihiro Ikemoto; Yasuyuki Watanabe; Hiroo Kawamoto; Masaya Kikukawa; Toshijiro Matsuura; Toshio Nakanishi; Goro Kajiyama

著者らは,肝予備能検査の中でガラクトース負荷試験が肝重量と関係なく代謝機能を有する残存肝細胞数と密接な関連を有する事を報告した.また,再生肝のガラクトース代謝にglucose-6-phosphatase活性が影響を及ぼしている事を報告したが,本論文では諸酵素を活性化すると考えられるグルカゴンの再生肝に及ぼす効果を検討した.グルカゴン非投与再生肝では肝切3日後に血中ガラクトース半減期が最延長したが,グルカゴン投与再生肝では有意の短縮を認めた.肝切3日後のグルカゴン投与再生肝と非投与再生肝におけるglucose-6-phosphatase活性と血中乳酸値について検討しグルカゴン投与再生肝においてglucose-6-phosphatase活性の上昇と血中乳酸値の低下を認めた.従ってグルカゴンは部分肝切除後の肝予備能の低下を防ぎ,肝細胞の有する代謝機能を保護することが示唆された.


Kanzo | 1985

Studies on the effect of estrogen on the antibody response in lupoid hepatitis.

Yasuhiro Mizoguchi; Hiroko Katoh; Hiroko Tsutsui; Keiji Miyajima; Yoshihide Sakagami; Toshihiro Higashimori; Shunichi Seki; Sukeo Yamamoto; Yoshihiro Ikemoto; Arai T; Seiji Morisawa

健常ヒトおよびルポイド肝炎患者の末梢血から単核細胞を分離してpokeweed mitogen(PWM)で刺激すると,trinitrophenyl化したヒツジ赤血球(TNP-SRBC)に対する抗体産生が誘導されたが,抗体産生細胞の誘導には両者の間に有意差を認めなかった.健常ヒトの末梢血単核細胞をPWMで刺激する際に,同時にエストロゲン(E)を添加すると,1×10-8~1×10-6mg/mlの添加によって抗体産生が増強され,5×10-7mg/mlの添加でその増強は最大であった.これに反して,ルポイド肝炎患者の場合は比較的高濃度のE(1×10-5mg/ml)の添加で抗体産生が最高に増強され,健常ヒトの場合とEに対する応答に差異が認められた.この差異がどの細胞populationの応答能の変化によるか検討すると,リンパ球と単球の両者の応答の低下が認められた.以上の結果から,ルポイド肝炎においてはEに対する反応性が健常ヒトと異なることが示唆された.


Kanzo | 1984

The effect of Kupffer cells on mitogen-induced lymphocyte transformation.

Arai T; Yasuhiro Mizoguchi; Keiji Miyajima; Yoshihiro Ikemoto; Hiroko Tsutsui; Hiroko Kato; Sukeo Yamamoto; Seiji Morisawa

ヒト末梢血から分離した単核細胞をin vitroでphytohemagglutinin, concanavalin Aまたはpokeweed mitogenで刺激し,3H-thymidineの酸不溶性分画へのとりこみを指標としてリンパ球幼若化反応を検討した.この実験系に,ラット肝から分離したKupffer細胞の48時間培養上清をmitogenと同時に添加すると,3H-thymidineのとりこみは著明に抑制された.しかし,Kupffer細胞を培養する際にindomethacinを添加して48時間培養し,その培養上清をmitogenで単核細胞を刺激する際に加えると,リンパ球幼若化反応の抑制は有意に低下した.これらの結果から,Kupffer細胞培養上清中にはprostaglandinが存在し,これがmitogenによるリンパ球幼若化反応を抑制すると推測された.


Nihon Naika Gakkai zasshi. The Journal of the Japanese Society of Internal Medicine | 1986

A case of asymptomatic primary biliary cirrhosis with chronic thyroiditis and triple cancers

Watanabe Y; Kawakami H; Kawamoto H; Matsuura T; Yoshihiro Ikemoto; Takezaki E; Aoki Y; Tari A; Goro Kajiyama; Takeno H


Kanzo | 1986

Effect of neonatal thymectomy on experimental autoimmune hepatitis in mice.

Yasuyuki Watanabe; Hiroiku Kawakami; Hiroo Kawamoto; Yoshihiro Ikemoto; Toshijiro Matsuura; Shigeru Nakayama; Yukio Matsuo; Shoichi Suemori; Masaya Kikkawa; Eiichi Takezaki; Toshio Nakanishi; Kazunari Masuda; Goro Kajiyama; Hiromu Takeno; Masami Yamamoto


Kanzo | 1986

Experimental study on galactose tolerance test in D-galactosamine treated rat liver.

Shoichi Suemori; Eiichi Takezaki; Ikuo Matuo; Sigeru Nakayama; Toshio Nakamura; Kazunari Masuda; Shingo Moriishi; Yoshihiro Ikemoto; Yasuyuki Watanabe; Masaya Kikkawa; Toshio Nakanishi; Hiroiku Kawakami; Goro Kajiyama


Kanzo | 1991

Effects of neonatal thymectomy on Propionibacterium acnes and lipopolysaccharide induced liver injury in mice.

Kazunari Masuda; Yasuyuki Watanabe; Toshio Nakanishi; Yoshihiro Ikemoto; Koichi Komatsu; Hiroyuki Itoh; Mikiya Kitamoto; Hiroshi Kohno; Hajime Amano; Tohru Tamura; Toshio Nakamura; Goro Kajiyama; Masami Yamamoto


Kanzo | 1990

Effect of neonatal thymectomy on D-galactosamine induced liver injury in mice.

Kazunari Masuda; Yasuyuki Watanabe; Toshio Nakanishi; Yoshihiro Ikemoto; Koichi Komatsu; Hiroyuki Itoh; Mikiya Kitamoto; Hiroshi Kohno; Hazime Amano; Tohru Tamura; Toshio Nakamura; Toshio Miura; Masaya Kamiyasu; Goro Kaziyama; Masami Yamamoto

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