著者

熊谷 雄治 藤田 朋恵 横田 愼一 澤田 実花 井澤 志名野 鈴木 勇一 立岡 和弘 庄田 隆 矢後 和夫

出版者

The Japanese Society of Clinical Pharmacology and Therapeutics

雑誌

臨床薬理 (ISSN:03881601)

巻号頁・発行日

vol.33, no.5, pp.205-213, 2002-09-30 (Released:2010-06-28)

参考文献数

8

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Objectives: Tibolone (KB-889) is a novel compound that possesses tissue-specific hormonal effects. We investigated the pharmacokinetics of tibolone in postmenopausal women in four pharmacokinetic studies, namely a dose linearity study, a multiple dose study, a study in fasted condition, and a study in elderly. In this report, the results obtained from the above four studies are summarized.Methods: In the dose linearity study, a single dose of 0.5 mg, 1 mg and 2 mg of tibolone was administered to 6 postmenopausal women using a 3-period crossover method with at least a 7-day wash-out period between treatments. In the multiple dose study, 2 mg of tibolone was administered once daily for 4 days to 6 postmenopausal women. In the study in fasted condition, a single dose of 2 mg of tibolone was administered to 6 postmenopausal women after overnight fasts. In the study in elderly, a single dose of 2 mg of tibolone was administered to 6 elderly women aged 65 or older. Plasma and urine concentrations of tibolone and its metabolites were measured.Results and Conclusion: Plasma concentrations of the 3α-OH and 3β-OH metabolites of tibolone were measured, since the levels of tibolone and its Δ4-isomer were under or near the detection limits. After single dose administration of 0.5, 1 and 2 mg of tibolone, the means of Cmax and AUC0-12h of plasma 3α-OH metabolite were 2.3, 3.5 and 6.5 ng/mL and 10.2, 18.5 and 36.7 ng·Eh/mL, respectively, and those of 3β-OH metabolites were 0.9, 1.7 and 3.1 ng/mL and 4.6, 8.8 and 17.7 ng·Eh/mL, respectively. The means of Tmax and T1/2 (6-12h) of plasma 3α-OH and 3β-OH metabolites were between 3.7 and 5.7 h, and between 3.2 and 4.4 h, respectively. The pharmacokinetic properties of tibolone were considered to be linear within the dose range of 0.5 mg to 2 mg. In the multiple dose study, no accumulation was found. When comparing the pharmacokinetic parameters obtained from the study in fasted condition with those of day 1 of the multiple dose study, the absorption of tibolone was rapid under fasted condition, but AUC was not influenced by food intake. [The means of Tmax of 3α-OH and 3β-OH metabolites were 1.17 and 1.33 h in fasted condition, and 3.83 and 4.00 h on day 1 of multiple dose.] Finally no difference in pharmacokinetics was found between postmenopausal women and elderly women in the comparison of the pharmacokinetic parameters obtained from the study in the elderly and those of day 1 of the multiple dose study.

著者

脇坂 真美 宋 一大 田ヶ谷 浩邦 藤田 朋恵 前田 実花 野村 今日子 小林 真美 山本 明子 坂本 泰理 田中 理英子 熊谷 雄治

出版者

一般社団法人 日本臨床薬理学会

雑誌

臨床薬理 (ISSN:03881601)

巻号頁・発行日

vol.46, no.5, pp.243-248, 2015-09-30 (Released:2016-01-15)

参考文献数

15

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The aim of the present trial was to compare the sedative effects of second generation antihistamines in healthy adult male volunteers. This randomized, double-blind, cross-over clinical trial compared the effects of single doses of olopatadine 5 mg, ketotifen fumarate 1.38 mg, fexofenadine 60 mg, and placebo on psychomotor function in 15 healthy male subjects who gave written informed consent for participation in the study. For each sedative, sleep latency time was measured using the multiple sleep latency test (MSLT); and psychomotor function was measured by thresholds of critical flicker fusion (CFF), the digit symbol substitution test (DSST), and a Straight line Analog Rating Scale (LARS). Measurements were performed before and 2, 5, and 8h after drug administration. The differences between the drugs and placebo were analyzed by repeated analysis of variance (ANOVA) and paired t-tests as appropriate. Intergroup differences in baseline values of all parameters were not significant. Ketotifen induced the shortest sleep latency at 2h (p=0.03 vs. fexofenadine, p=0.03 vs. olopatadine) and 5h (p=0.04 vs. fexofenadine) after administration. Ketotifen also showed the most prolonged recognition (CFF down) at 2h (p<0.001 vs. fexofenadine, p=0.03 vs. olopatadine) and 8h (p=0.01 vs. fexofenadine). Olopatadine showed a more prolonged recognition than fexofenadine at 2h (p=0.03). Ketotifen induced the greatest decline in concentration and cognitive function at 8h (p=0.03) according to DSST. The drugs affected objective psychomotor function without causing subjective symptoms as shown by no significant differences in LARS score. The study indicates that the extent of impaired performance, an important adverse drug reaction, may differ even among second generation antihistamines.

著者

馬嶋 正隆 藤田 朋恵 林 泉

出版者

北里大学

雑誌

萌芽研究

巻号頁・発行日

2004

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マウス皮下組織にsarcima-180あるいはNFSA腫瘍細胞株を接種するとゆっくりとした腫留の形成が認められる。これらの動物にACE阻害薬のリジノプリルあるいはAT1受容体格抗薬のTCV-116を投与すると、血管新生および腫瘍増殖は強く抑制された。腫瘍周囲ストローマを含む試料でAT受容体サブタイプの発現解析を行うと、AT2およびAT1bは全く検出されず、AT1aのみ検出された。免疫組織化学でAT1の組織内発現を調べると、AT1を発現しているのは腫瘍細胞ではなくむしろ腫瘍周囲めストローマであった。致死量の放射線をWTのC57BL/6に照射し、WTあるいはATlaノックアウトマウスめ骨髄細胞を尾静脈より移植し、その後LLCを接種すると、AT1aノックアウトマウスの骨髄細胞を移植したマウスで、腫瘍増殖および血管新生の著しい抑制がみられた。AT1aノックアウトマウスには、欠損する遺伝子にLacZ遺伝子を導入しているので、β-galの免疫組織化学をおごなうと、確かにAT1aノックアウトマウスの骨髄細胞を移植したマウスで、ストローマ部位で陽性像が認められた。さらに同部位でVEGFの発現を調べると、AT1aノックアウトマウスの骨髄細胞を移植したマウスで、減少していることが判明した。骨髄より間質に浸潤するストローマ細胞のAT1aを選択的にノックアウトすることで、がん依存性の血管新生、増殖が抑制され、遺伝子を改変した骨髄細胞移植が固形腫瘍の治療になりうることを示すことが出来た。