RIKITAKE Hiroshi Kurume Univ. School of Med., Assistant, 医学部, 助手 (30191688)
IRIE Hitoshi Kurume Univ. School of Med., Assistant, 医学部, 助手 (40176516)
南 泰三 久留米大学, 医学部, 助手 (10181950)
坂本 和義 久留米大学, 医学部, 講師
YAMANA Hideaki Kurume Univ. School of Med., Lecture, 医学部, 講師 (30140669)
TOMITA Yuuske Kurume Univ. School of Med., Assistant, 医学部, 助手 (30197933)
|Budget Amount *help
¥2,300,000 (Direct Cost : ¥2,300,000)
Fiscal Year 1991 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1990 : ¥800,000 (Direct Cost : ¥800,000)
Fiscal Year 1989 : ¥800,000 (Direct Cost : ¥800,000)
Monoclonal antibody KYSM-1, whose immunoglobulin was IgM, was produced against human squamous cell carcinoma of the esophagus (KE-1) which was maintained by serial subcutaneous transplantation in nude mice. In immunohistochemical reactions with various cancerous tissues, this monoclonal antibody showed a strong reactivity specific to squamous cell carcinoma of the esophagus and lung (92%, 58/63 and 100%, 4/4), with the lack of gastrointestinal adenocarcinomas and a pulmonary small cell carcinoma. In contrast to this result, no reaction was recognized in normal tissues, such as esophagus, lung, stomach, colon, liver, spleen, lymph node, pancreas, kidney, and mammary gland, however, weekly reaction was found in the basal layer of the esophageal mucosa.
On the other hand, another monoclonal antibody KIS-1, whose immnoglobulin subclass was IgG_1, was also produced against human esophageal carcinoma cell line KE-2. This antibody has high specificity to squamous cell carcinomas of the esophag
us and lung. Twenty eight of 30 (93%) esophageal squamous cancers, 6 of 7 (86%) pulmonary squamous cancers, 2 of 5 pulmonary adenocarcinomas and 1 of 15 (7%) gastric cancers, while no reactions with various normal tissues were found.
These two monoclonal antibody were labeled with ^<125>I and in vivo radioimmunolocation of radiolabeled antibodies ( ^<125>I-KYSM1 & ^<125>I-KIS1) was studied using nude mice who had human esophageal carcinoma KE-1 or KE-2. Both of radiolabeled KYSM-1 and KIS-1 showed a high binding to KE-1 and KE-2 cells. Although, the in vivo tumor accumulation of only ^<125>I-labeled KIS-1 was significantly higher than that of ^<125>I-labeled control ( ^<125>I-IgG_1) 120 hr and 168 hr after the injection. Moreover, ^<125>I-labeled KIS-1 F(ab')_2 showed more significant in vivo radioimmunolocation of the nude mice bearing tumor at 36 hr after the injection. And scanning with the gamma camera after injection of ^<131>I-labeled KIS-1 F(ab')_2 showed finely visible at the day 3.
These results indicate that KIS-1 antibody is useful not only for the immunoscintigraphy of the metastatic lymph node and/or esophageal tumor but also for the targeting chemotherapy using drug-antibody conjugate. Less