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Title: Usefulness of combined treatment with continuous administration of tirapazamine and mild temperature hyperthermia in γ-ray irradiation in terms of local tumour response and lung metastatic potential.
Authors: Masunaga, Shin-Ichiro  kyouindb  KAKEN_id
Liu, Yong
Sakurai, Yoshinori  kyouindb  KAKEN_id  orcid (unconfirmed)
Tanaka, Hiroki  kyouindb  KAKEN_id
Suzuki, Minoru  kyouindb  KAKEN_id  orcid (unconfirmed)
Kondo, Natsuko  kyouindb  KAKEN_id
Maruhashi, Akira
Ono, Koji
Author's alias: 増永, 慎一郎
Keywords: acute hypoxia
chronic hypoxia
mild temperature hyperthermia
quiescent cell
Issue Date: 2012
Publisher: Informa Healthcare
Journal title: International journal of hyperthermia
Volume: 28
Issue: 7
Start page: 636
End page: 644
Abstract: Purpose: To evaluate the usefulness of combined treatment with continuous administration of a hypoxic cytotoxin, tirapazamine (TPZ), and mild temperature hyperthermia (MTH) in γ-ray irradiation in terms of local tumour response and lung metastatic potential, referring to the response of intratumour quiescent (Q) cells. Materials and methods: B16-BL6 melanoma tumour-bearing C57BL/6 mice were continuously given 5-bromo-2′-deoxyuridine (BrdU) to label all proliferating (P) cells. The tumour-bearing mice then received γ-ray irradiation after a single intraperitoneal injection or 24 h continuous subcutaneous infusion of TPZ, either with or without MTH. Immediately after the irradiation, cells from some tumours were isolated and incubated with a cytokinesis blocker. The responses of the Q and total (= P + Q) cell populations were assessed based on the frequency of micronuclei using immunofluorescence staining for BrdU. In other tumour-bearing mice, 17 days after irradiation, macroscopic lung metastases were enumerated. Results: Continuous administration elevated the sensitivity of both the total and Q cells, especially the total cells. MTH raised the sensitivity of Q cells more remarkably in both single and continuous administrations, probably because of more exposure to TPZ in intermediately hypoxic areas derived mainly from chronic hypoxia through MTH. With or without irradiation, TPZ, especially administered continuously and combined with MTH, decreased the number of lung metastases. Conclusion: The combination of continuous long-term administration of TPZ and MTH in γ-ray irradiation was thought to be promising because of its potential to enhance local tumour response and repress lung metastatic potential.
Rights: © 2012 Informa UK Ltd.
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.3109/02656736.2012.714517
PubMed ID: 22946564
Appears in Collections:Journal Articles

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