Open AccessEnhancement of Blood Stasis and Vascular Permeability in Meth‐A Tumors by Administration of Hyperthermia in Combination with Tumor Necrosis Factor
Author(s) -
Umeno Hiroshi,
Watanabe Naoki,
Yamauchi Naofumi,
Tsuji Naoki,
Okamoto Tetsuro,
Niitsu Yoshiro
Publication year - 1994
Publication title -
japanese journal of cancer research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.035
H-Index - 141
eISSN - 1349-7006
pISSN - 0910-5050
DOI - 10.1111/j.1349-7006.1994.tb02100.x
Subject(s) - hyperthermia , tumor necrosis factor alpha , medicine , vascular permeability , blood flow , necrosis , cytokine , endocrinology , pharmacology
Blood stasis and vascular permeability induced by tumor necrosis factor (TNF) in Meth‐A tumors transplanted in BALB/c mice were significantly enhanced by hyperthermia at 40°C for 30 min immediately following TNF administration. A dose‐dependent, sustained decline in the intratumoral blood flow rate occurred following the administration of TNF alone (i.v.; 5 × 10 3 , 5 × 10 4 , or 5 × 10 5 JRU/kg) and was enhanced by the administration of hyperthermia in combination with the TNF, even though no decline occurred with hyperthermia alone. The combination of TNF at 5 × 10 5 JRU/kg and hyperthermia resulted in a blood flow ratio (ratio of blood flow after administration to that before) of 0.47 at 1 h compared with a ratio of 0.65 at 1 h after TNF alone. The blood flow in normal skin sites did not decrease in any case. The permeability of the intratumoral vasculature similarly increased in a dose‐dependent manner after the administration of TNF alone and was further increased by combination with hyperthermia, even though no increase occurred with hyperthermia alone. The mean permeability in mice receiving TNF alone at 5 × 10 5 JRU/kg was 1.35 times that in untreated mice. In mice receiving TNF at the same dose together with hyperthermia, the ratio was increased to 1.65. The results suggest that TNF selectively suppresses intratumoral blood flow, that this effect is enhanced by mild hyperthermia, and that the mechanism of the suppression by TNF with or without hyperthermia partly involves an increase in blood vessel permeability.