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PubMed1994

Quantitative structure-activity relationships by neural networks and inductive logic programming. II. The inhibition of dihydrofolate reductase by triazines.

One of the largest available data sets for developing a quantitative structure-activity relationship (QSAR)--the inhibition of dihydrofolate reductase (DHFR) by 2,4-diamino-6,6-dimethyl-5-phenyl-dihydrotriazine derivatives--has been used for a sixfold cross-validation trial of neural networks, inductive logic programming (ILP) and linear regression. No statistically significant difference was found between the predictive capabilities of the methods. However, the representation of molecules by attributes, which is integral to the ILP approach, provides understandable rules about drug-receptor interactions.

Animals↗
PubMed1983

Phase II study of Baker's antifol (triazinate, TZT, NSC 139, 105) in advanced carcinoma of the ovary. A Gynecologic Oncology Group study.

Twenty-nine patients with advanced ovarian carcinoma were entered into a Gynecologic Group Phase II study of Baker's Antifol. Of these, 26 were eligible for evaluation of toxicity and 25 for evaluation of response. The evaluable patients constituted an unusually favorable group for a Phase II study in a chemotherapy-sensitive tumor; although all have received prior chemotherapy, eight had had treatment with only a single alkylating agent and the median performance status of the study population was two (ambulatory, capable of self-care). No complete responses were seen. Two patients had regression of abdominal tumor masses sufficient to qualify as partial responders (PR 8%). Dose-limiting toxicity, as expected, was found to be gastrointestinal. Significant mucositis and dermatitis were also observed. No episodes of hypotension during infusion occurred with a 60-120 min time of administration. Baker's antifol has only limited activity against ovarian carcinoma previously treated with chemotherapy and is not likely to contribute to improved therapy, either as a single agent or in combination.

Antineoplastic Agents↗
PubMed1995

Parasitic apicomplexans harbor a chlorophyll a-D1 complex, the potential target for therapeutic triazines.

Ultrastructural evidence is presented for the presence of plastid-like organelles in Toxoplasma gondii, Sarcocystis muris, Babesia ovis, and Plasmodium falciparum. In addition, it was shown that merozoites of T. gondii contain protochlorophyllidae a and traces of chlorophyll a bound to the photosynthetic reaction centers I PS I and PS II. A psbA gene was isolated from merozoites of S. muris by the polymerase chain reaction (PCR). Partial sequencing of the PCR product revealed that the herbicide-binding region is highly conserved. Therefore, it is likely that the sensitivity of apicomplexans to the herbicide toltrazuril depends on the interaction of the herbicide with the D1 protein of the photosynthetic reaction center of the parasite's organelles.

Amino Acid Sequence↗
PubMedDate not supplied

Triazine and chloroacetamide herbicides in Sydenham River water and municipal drinking water, Dresden, Ontario, Canada, 1981-1987.

Samples of raw river water from the Sydemham River, Ontario were collected 30 to 50 times per year between 1981 and 1987 along with paired samples of drinking water from the town of Dresden. Atrazine and its metabolite, deethyl atrazine, were found in 89 to 100% of the raw water over the seven year period. Alachlor was found only in 1982, 1984 and 1985 when 2 to 17% of raw waters were contaminated. Cancellation of the registration to use alachlor at the end of 1985 resulted in no residues being found in 1986 and 1987. Cyanazine was found in 3 to 29% (1982-87), metolachlor in 19 to 27% (1984-87) and metribuzin in 2 to 7% (1982-86) of raw river water. Comparison of those residues in raw with those in drinking water revealed that chlorination of river water had no effect in reducing herbicide concentrations. During 1985 the addition of up to 50 mg/L of powdered charcoal to raw water reduced residues to near or below detection limits for s-traizine and chloroacetamide herbicides. However, in 1986, with a reduced rate of 20 mg/L of charcoal herbicide residues were only slightly reduced and in 1987 with only 5 mg/L no reductions occurred.

Acetamides↗