The uptake of 3H-vincristine by a mouse carcinoma during a course of fractionated radiotherapy

Abstract

Summary The variations in uptake of 3H-vincristine sulphate, given as a bolus i.v. injection, by a transplantable murine tumour during a realistic course of fractionated daily y-radiation of 25 x 2.0 Gy have been investigated. Maximum levels of 3H in the tumours are found when the tracer is injected 4 h after irradiation and the tumours are dissected out 1 h after injection. During the course of daily irradiation the pattern of uptake varies considerably but reproducibly. There are peaks of uptake after 7, 13 and 22 fractions of 2.0 Gy when the amount of 3H in the tumours is as much as three times that found in non-irradiated tumours. After 17-18 fractions, however, the tumour content of 3H is lower than that of non-irradiated tumours. The wave-like pattern of uptake could be due either to capillary occlusion brought about by radiation induced cellular swelling and oedema followed by re-opening of the capillaries during periods of decreased cellularity, or to some mechanism of recovery from radiation damage during the week-end rest period.

Entwicklung und Anwendung dynamischer MRT-Messungen zur Evaluierung von Perfusionsveränderungen bei Rektumkarzinomen unter Bestrahlung in der klinischen Routine Erste Ergebnisse

“…Untersuchungen zur Interaktion zwischen Radio-und Chemotherapie basieren hauptsächlich auf In-vitro-Versuchen, die in Zellkulturen durchgeführt wurden [3,27]. Einen Zusammenhang einer 3 H-Vincristinakkumulation im Tumor mit der fraktioniert gegebenen Strahlendosis konnten Zanelli et al [31] bei transplantierten Mäusekarzinomen nachweisen. Einen Zusammenhang einer 3 H-Vincristinakkumulation im Tumor mit der fraktioniert gegebenen Strahlendosis konnten Zanelli et al [31] bei transplantierten Mäusekarzinomen nachweisen.…”