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The antitumour activity of 5,6-dimethylxanthenone-4-acetic acid (DMXAA) in TNF receptor-1 knockout mice.

Zhao L, Ching LM, Kestell P, Baguley BC - Br. J. Cancer (2002)

Bottom Line: However, the maximum tolerated dose of 5,6-dimethylxanthenone-4-acetic acid was considerably higher in tumour necrosis factor receptor-1(-/-) mice (>100 mg kg(-1)) than in wild-type mice (27.5 mg kg(-1)).However, the reduced toxicity in tumour necrosis factor receptor-1(-/-) mice allowed the demonstration that at a higher dose (50 mg kg(-1)), 5,6-dimethylxanthenone-4-acetic acid was curative and comparable in effect to that of a lower dose (25 mg kg(-1)) in wild-type mice.The results suggest an important role for tumour necrosis factor in mediating both the host toxicity and antitumour activity of 5,6-dimethylxanthenone-4-acetic acid, but also suggest that tumour necrosis factor can be replaced by other vasoactive factors in its antitumour action, an observation of relevance to current clinical studies.

View Article: PubMed Central - PubMed

Affiliation: Auckland Cancer Society Research Centre, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand.

ABSTRACT
5,6-dimethylxanthenone-4-acetic acid, a novel antivascular anticancer drug, has completed Phase I clinical trial. Its actions in mice include tumour necrosis factor induction, serotonin release, tumour blood flow inhibition, and the induction of tumour haemorrhagic necrosis and regression. We have used mice with a targeted disruption of the tumour necrosis factor receptor-1 gene as recipients for the colon 38 carcinoma to determine the role of tumour necrosis factor signalling in the action of 5,6-dimethylxanthenone-4-acetic acid. The pharmacokinetics of 5,6-dimethylxanthenone-4-acetic acid, as well as the degree of induced plasma and tissue tumour necrosis factor, were similar in tumour necrosis factor receptor-1(-/-) and wild-type mice. However, the maximum tolerated dose of 5,6-dimethylxanthenone-4-acetic acid was considerably higher in tumour necrosis factor receptor-1(-/-) mice (>100 mg kg(-1)) than in wild-type mice (27.5 mg kg(-1)). The antitumour activity of 5,6-dimethylxanthenone-4-acetic acid (25 mg kg(-1)) was strongly attenuated in tumour necrosis factor receptor-1(-/-) mice. However, the reduced toxicity in tumour necrosis factor receptor-1(-/-) mice allowed the demonstration that at a higher dose (50 mg kg(-1)), 5,6-dimethylxanthenone-4-acetic acid was curative and comparable in effect to that of a lower dose (25 mg kg(-1)) in wild-type mice. The 5,6-dimethylxanthenone-4-acetic acid -induced rise in plasma 5-hydroxyindoleacetic acid, used to reflect serotonin production in a vascular response, was larger in colon 38 tumour bearing than in non-tumour bearing tumour necrosis factor receptor-1(-/-) mice, but in each case the response was smaller than the corresponding response in wild-type mice. The results suggest an important role for tumour necrosis factor in mediating both the host toxicity and antitumour activity of 5,6-dimethylxanthenone-4-acetic acid, but also suggest that tumour necrosis factor can be replaced by other vasoactive factors in its antitumour action, an observation of relevance to current clinical studies.

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Plasma DMXAA concentration-time profiles in WT and TNFR1−/− colon 38-bearing mice. Concentrations were measured up to 8 h after administration of DMXAA (25 mg kg−1) and expressed as the mean±s.e. (n=3).
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fig4: Plasma DMXAA concentration-time profiles in WT and TNFR1−/− colon 38-bearing mice. Concentrations were measured up to 8 h after administration of DMXAA (25 mg kg−1) and expressed as the mean±s.e. (n=3).

Mentions: To determine whether the difference in antitumour activity of DMXAA in WT and TNFR1−/− mice was influenced by altered DMXAA pharmacokinetics, we compared DMXAA plasma concentration-time profiles in WT and TNFR1−/− colon 38 tumour-bearing mice up to 8 h after DMXAA administration (25 mg kg−1) (Figure 4Figure 4


The antitumour activity of 5,6-dimethylxanthenone-4-acetic acid (DMXAA) in TNF receptor-1 knockout mice.

Zhao L, Ching LM, Kestell P, Baguley BC - Br. J. Cancer (2002)

Plasma DMXAA concentration-time profiles in WT and TNFR1−/− colon 38-bearing mice. Concentrations were measured up to 8 h after administration of DMXAA (25 mg kg−1) and expressed as the mean±s.e. (n=3).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2376130&req=5

fig4: Plasma DMXAA concentration-time profiles in WT and TNFR1−/− colon 38-bearing mice. Concentrations were measured up to 8 h after administration of DMXAA (25 mg kg−1) and expressed as the mean±s.e. (n=3).
Mentions: To determine whether the difference in antitumour activity of DMXAA in WT and TNFR1−/− mice was influenced by altered DMXAA pharmacokinetics, we compared DMXAA plasma concentration-time profiles in WT and TNFR1−/− colon 38 tumour-bearing mice up to 8 h after DMXAA administration (25 mg kg−1) (Figure 4Figure 4

Bottom Line: However, the maximum tolerated dose of 5,6-dimethylxanthenone-4-acetic acid was considerably higher in tumour necrosis factor receptor-1(-/-) mice (>100 mg kg(-1)) than in wild-type mice (27.5 mg kg(-1)).However, the reduced toxicity in tumour necrosis factor receptor-1(-/-) mice allowed the demonstration that at a higher dose (50 mg kg(-1)), 5,6-dimethylxanthenone-4-acetic acid was curative and comparable in effect to that of a lower dose (25 mg kg(-1)) in wild-type mice.The results suggest an important role for tumour necrosis factor in mediating both the host toxicity and antitumour activity of 5,6-dimethylxanthenone-4-acetic acid, but also suggest that tumour necrosis factor can be replaced by other vasoactive factors in its antitumour action, an observation of relevance to current clinical studies.

View Article: PubMed Central - PubMed

Affiliation: Auckland Cancer Society Research Centre, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand.

ABSTRACT
5,6-dimethylxanthenone-4-acetic acid, a novel antivascular anticancer drug, has completed Phase I clinical trial. Its actions in mice include tumour necrosis factor induction, serotonin release, tumour blood flow inhibition, and the induction of tumour haemorrhagic necrosis and regression. We have used mice with a targeted disruption of the tumour necrosis factor receptor-1 gene as recipients for the colon 38 carcinoma to determine the role of tumour necrosis factor signalling in the action of 5,6-dimethylxanthenone-4-acetic acid. The pharmacokinetics of 5,6-dimethylxanthenone-4-acetic acid, as well as the degree of induced plasma and tissue tumour necrosis factor, were similar in tumour necrosis factor receptor-1(-/-) and wild-type mice. However, the maximum tolerated dose of 5,6-dimethylxanthenone-4-acetic acid was considerably higher in tumour necrosis factor receptor-1(-/-) mice (>100 mg kg(-1)) than in wild-type mice (27.5 mg kg(-1)). The antitumour activity of 5,6-dimethylxanthenone-4-acetic acid (25 mg kg(-1)) was strongly attenuated in tumour necrosis factor receptor-1(-/-) mice. However, the reduced toxicity in tumour necrosis factor receptor-1(-/-) mice allowed the demonstration that at a higher dose (50 mg kg(-1)), 5,6-dimethylxanthenone-4-acetic acid was curative and comparable in effect to that of a lower dose (25 mg kg(-1)) in wild-type mice. The 5,6-dimethylxanthenone-4-acetic acid -induced rise in plasma 5-hydroxyindoleacetic acid, used to reflect serotonin production in a vascular response, was larger in colon 38 tumour bearing than in non-tumour bearing tumour necrosis factor receptor-1(-/-) mice, but in each case the response was smaller than the corresponding response in wild-type mice. The results suggest an important role for tumour necrosis factor in mediating both the host toxicity and antitumour activity of 5,6-dimethylxanthenone-4-acetic acid, but also suggest that tumour necrosis factor can be replaced by other vasoactive factors in its antitumour action, an observation of relevance to current clinical studies.

Show MeSH
Related in: MedlinePlus