Usefulness of hexamethylenetetramine as an adjuvant to radiation and cisplatin in the treatment of solid tumors: its independency of p53 status

The usefulness of hexamethylenetetramine as an adjuvant to radiation and cisplatin in the treatment of solid tumors and its dependency on the p53 status of tumor cells were examined. Human head and neck squamous cell carcinoma cells transfected with mutant TP53 (SAS/mp53), or with neo vector as a co...

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Veröffentlicht in:Journal of radiation research 2010-01, Vol.51 (1), p.27-35
Hauptverfasser: Masunaga, Shin-ichiro, Tano, Keizo, Nakamura, Jun, Watanabe, Masami, Kashino, Genro, Takahashi, Akihisa, Tanaka, Hiroki, Suzuki, Minoru, Ohnishi, Ken, Kinashi, Yuko, Liu, Yong, Ohnishi, Takeo, Ono, Koji
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container_issue 1
container_start_page 27
container_title Journal of radiation research
container_volume 51
creator Masunaga, Shin-ichiro
Tano, Keizo
Nakamura, Jun
Watanabe, Masami
Kashino, Genro
Takahashi, Akihisa
Tanaka, Hiroki
Suzuki, Minoru
Ohnishi, Ken
Kinashi, Yuko
Liu, Yong
Ohnishi, Takeo
Ono, Koji
description The usefulness of hexamethylenetetramine as an adjuvant to radiation and cisplatin in the treatment of solid tumors and its dependency on the p53 status of tumor cells were examined. Human head and neck squamous cell carcinoma cells transfected with mutant TP53 (SAS/mp53), or with neo vector as a control (SAS/neo), were inoculated subcutaneously into both the hind legs of Balb/cA nude mice. The tumor-bearing mice received 5-bromo-2'-deoxyuridine (BrdU) continuously to label all proliferating (P) cells in the tumors. Then, they received hexamethylenetetramine (HMTA), intraperitoneally or continuously, combined with or without gamma-ray irradiation or cisplatin treatment. Immediately after treatment following HMTA, the response of quiescent (Q) cells was assessed in terms of the micronucleus frequency using immunofluorescence staining for BrdU. The response of the total (= P + Q) tumor cells was determined from the BrdU non-treated tumors. A higher toxicity of HMTA to Q cells than total cells, especially in SAS/neo, was made less clear by continuous administration. There was no apparent difference in the radio- and cisplatin-sensitivity enhancing effects by HMTA combination between SAS/neo and SAS/mp53 tumors, with a slightly greater effect in SAS/mp53. In both SAS/neo and SAS/mp53 tumors, continuous HMTA administration produced higher radio- and cisplatin-sensitivity enhancing effects than intraperitoneal single administration. Therefore, the use of HMTA as an adjuvant to radiation or cisplatin might be promising in curing solid tumors with large fraction of hypoxic cells and also with frequent loss-of-function in p53.
doi_str_mv 10.1269/jrr.09072
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Human head and neck squamous cell carcinoma cells transfected with mutant TP53 (SAS/mp53), or with neo vector as a control (SAS/neo), were inoculated subcutaneously into both the hind legs of Balb/cA nude mice. The tumor-bearing mice received 5-bromo-2'-deoxyuridine (BrdU) continuously to label all proliferating (P) cells in the tumors. Then, they received hexamethylenetetramine (HMTA), intraperitoneally or continuously, combined with or without gamma-ray irradiation or cisplatin treatment. Immediately after treatment following HMTA, the response of quiescent (Q) cells was assessed in terms of the micronucleus frequency using immunofluorescence staining for BrdU. The response of the total (= P + Q) tumor cells was determined from the BrdU non-treated tumors. A higher toxicity of HMTA to Q cells than total cells, especially in SAS/neo, was made less clear by continuous administration. There was no apparent difference in the radio- and cisplatin-sensitivity enhancing effects by HMTA combination between SAS/neo and SAS/mp53 tumors, with a slightly greater effect in SAS/mp53. In both SAS/neo and SAS/mp53 tumors, continuous HMTA administration produced higher radio- and cisplatin-sensitivity enhancing effects than intraperitoneal single administration. Therefore, the use of HMTA as an adjuvant to radiation or cisplatin might be promising in curing solid tumors with large fraction of hypoxic cells and also with frequent loss-of-function in p53.</abstract><cop>England</cop><pub>Oxford University Press</pub><pmid>19801892</pmid><doi>10.1269/jrr.09072</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record>
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subjects Adjuvant chemotherapy
Adjuvants
Animals
Antineoplastic Agents - administration & dosage
Antineoplastic Combined Chemotherapy Protocols - administration & dosage
Bromodeoxyuridine
Carcinoma, Squamous Cell - metabolism
Carcinoma, Squamous Cell - pathology
Carcinoma, Squamous Cell - therapy
Cell Line, Tumor
Cell Survival - drug effects
Cell Survival - radiation effects
Chemotherapy, Adjuvant - methods
Cisplatin
Cisplatin - administration & dosage
Drug therapy
Head and neck cancer
Humans
Hypoxia
Immunofluorescence
Leg
Methenamine - administration & dosage
Mice
Mice, Nude
p53 protein
Radiation
Radiation (Physics)
Radiotherapy, Conformal - methods
Solid tumors
Squamous cell carcinoma
Toxicity
Treatment Outcome
Tumor cells
Tumor proteins
Tumor Suppressor Protein p53 - metabolism
Tumors
title Usefulness of hexamethylenetetramine as an adjuvant to radiation and cisplatin in the treatment of solid tumors: its independency of p53 status
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