Fluctuations in Tumor Blood Flow under Normotension and the Effect of Angiotensin II‐induced Hypertension

Katsuyoshi Hori, Maroh Suzuki, Shigeru Tanda, Sachiko Saito, Mika Shinozaki, Qiu‐Hang ‐H Zhang

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

To elucidate the significance of angiotensin II (AID‐induced hypertension chemotherapy, changes of tissue blood flow both in normal subcutis and in tumors (AH109A, LY80) were measured with the hydrogen gas clearance method. A newly‐developed anesthetic machine was used to keep the animals' condition constant. Tissue blood flow in normal subcutis and tumors always fluctuated with time under normotension. The nature and the rate of fluctuation in tumor Wood flow were almost identical in two different types of tumors. However, the fluctuation of blood flow in tumor and that in normal subcutis were almost always inversely related when blood flows in these different tissues were measured simultaneously, i.e., when tissue blood flow in normal subcutis decreased, tumor blood flow increased, and vice versa. The findings supported the idea that the connection mode between the tumor vascular bed and normal vascular bed is a parallel circuit. Vascular resistance in the normal vascular bed under All‐induced hypertension seemed to be greater than that under normotension, because the All‐increased tumor blood flow always exceeded the maximum tumor blood flow under normotension. Due to the fluctuations of tumor blood flow, no‐flow or low‐flow areas, resistant to delivery of anti‐cancer drugs, moved sporadically within the tumor under the normotensive condition. However, good conditions for drug delivery to tumor tissue were induced by All‐induced hypertension.

Original languageEnglish
Pages (from-to)1309-1316
Number of pages8
JournalJapanese Journal of Cancer Research
Volume82
Issue number11
DOIs
Publication statusPublished - 1991 Nov

Keywords

  • Anesthetic machine
  • Angiotensin II
  • Hydrogen clearance method
  • No‐flow area
  • Tumor blood flow

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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