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141 records · Page 8Linked to original sources
PubMed1980

Antitumor effect of a new antibiotic, neothramycin.

A new anthramycin-group antitumor antibiotic, neothramycin, isolated from a Streptomyces culture, showed activity against experimental tumors such as lymphocytic leukemia P388 ascites sarcoma-180, hepatoma AH130, Walker carcinosarcoma-256 and mouse mammary adenocarcinoma (CCMT). In particular, the tumor growth inhibition ratio was as high as 96% when neothramycin was injected intraperitoneally at a daily dose of 2 mg/kg into Wistar strain rats previously inoculated with Walker carcinosarcoma-256 by the subcutaneous route. Successive intraperitoneal injections of the compound were more effective than a single injection with the P388 system.

Adenocarcinoma↗
PubMed1976

Effects of podophyllotoxin and VP-16-213 on microtubule assembly in vitro and nucleoside transport in HeLa cells.

VP-16-213, a semisynthetic derivative of podophyllotoxin, is an active antitumor agent. In this paper, the effects of VP-16-213 and podophyllotoxin on microtubule assembly in vitro and nucleoside transport in HeLa cells are compared. At 100 muM, VP-16-213 does not inhibit microtubule assembly in vitro, while 5 muM podophyllotoxin completely prevents the formation of microtubules. The presence of the glucoside moiety in VP-16-213 is responsible for the inactivity of VP-16-213 in this system because 4'-demethylepipodo-phyllotoxin, the nonglucoside congener of VP-16-213, inhibits microtubule assembly. In HeLa cells, VP-16-213 and podophyllotoxin share a common biological property; both agents inhibit the uptake of thymidine and uridine into cells by inhibiting the facilitated diffusional component of nucleoside transport. The conncentrations of drug necessary to inhibit thymidine and uridine uptake into HeLa cells by 50% are 10 and 5 muM, respectively, for podophyllotoxin, and 25 and 20 muM for VP-16-213. The action of podophyllotoxin on nucleoside transport appears unrelated to its effect on microtubule assembly, since VP-16-213, which does not inhibit microtubule assembly, inhibits nucleoside transport.

Adenosine↗
PubMed2001

DNA minor groove alkylating agents.

Recent work on a number of different classes of anticancer agents that alkylate DNA in the minor groove is reviewed. There has been much work with nitrogen mustards, where attachment of the mustard unit to carrier molecules can change the normal patterns of both regio- and sequence-selectivity, from reaction primarily at most guanine N7 sites in the major groove to a few adenine N3 sites at the 3'-end of poly(A/T) sequences in the minor groove. Carrier molecules discussed for mustards are intercalators, polypyrroles, polyimidazoles, bis(benzimidazoles), polybenzamides and anilinoquinolinium salts. In contrast, similar targeting of pyrrolizidine alkylators by a variety of carriers has little effect of their patterns of alkylation (at the 2-amino group of guanine). Recent work on the pyrrolobenzodiazepine and cyclopropaindolone classes of natural product minor groove binders is also reviewed.

Alkylating Agents↗
PubMed1998

Heterocyclic analogs of DNA minor groove alkylating agents.

It is generally accepted that neoplastic transformation is related to genes alteration or oncogene activation. In particular, DNA minor groove binding drugs have been extensively studied through the years in order to influence the regulation of gene expression by means of specific interactions with DNA bases moieties. Pyrrolo[2,1-c],[1,4].benzodiazepines (PBDs), CC-1065 and distamycins are three classes of minor groove binders which showed interesting cytotoxicity profiles, refined through already reviewed processes of SAR studies. Among the modifications to the three families of antitumor compounds, heterocyclic substitutions have been extensively applied by many groups in order to either modify the reactivity profile or introduce extra interactions within the minor groove, thus changing the binding site or modulating the binding sequence. The updated material related to these modifications has been rationalised and ordered to offer an overview of the argument.

Alkylating Agents↗
PubMed1982

Mechanism of interaction of CC-1065 (NSC 298223) with DNA.

CC-1065 (NSC 298223), a potent new antitumor antibiotic produced by Streptomyces zelensis, interacts strongly with double-stranded DNA and appears to exert its cytotoxic effects through disruption of DNA synthesis. We undertook this study to elucidate the sites and mechanisms of CC-1065 interaction with DNA. The binding of CC-1065 to synthetic and native DNA was examined by differential circular dichroism or by Sephadex chromatography with photometric detection. The binding of CC-1065 with calf thymus DNA was rapid, being complete within 2 hr, and saturated at 1 drug per 7 to 11 base pairs. The interaction of CC-1065 with synthetic DNA polymers indicated a specificity for adenine- and thymine-rich sites. Agarose gel electrophoresis of CC-1065-treated supercoiled DNA showed that CC-1065 did not intercalate. Site exclusion studies using substitutions in the DNA grooves showed CC-1065 to bind primarily in the minor groove. CC-1065 did not cause DNA breaks; it inhibited susceptibility of DNA to nuclease S1 digestion. It raised the thermal melting temperature of DNA, and it inhibited the ethidium-induced unwinding of DNA. Thus, in contrast to many antitumor agents, CC-1065 stabilized the DNA helix. DNA helix overstabilization may be relevant to the mechanism of action of CC-1065.

Animals↗
PubMed1980

New potential cytotoxic and antitumor substances. III. In vitro effect of 3-benzazepine derivatives on P388 cells.

3-Benzazepine derivatives manifested cytotoxic effects in in vitro tests on lympholeukemia P388 cells. The most efficient derivative (QF 1), i. e. 7,8-dihydro-3,4,12-trimetoxy-7-dimethylamino-10,11-methylenedioxy-5H-indolo [1,2-b][3]benzazepine-5-on in a concentration as low as 5 microliter/ml, considerably inhibited only the incorporation of labeled uridine into P388 cell fractions. In in vitro experiments, this substance blocked cell proliferation. After its prolonged action, the number of dead cells increased and this also when its interaction with the cells lasted but a short time--the substance being removed from the medium. In all probability, the substance retains the cells in the G1/S phase. A marked synergistic effect of tubercidine was attained in the presence of the substance.

Animals↗
PubMed1998

Ovarian germ cell tumors.

UNLABELLED: Ovarian germ cell tumors (OGCT) are a special type of ovarian cancers due to their histology, age of presentation, prognosis and treatment. MATERIAL AND METHODS: Eighteen cases of OGCT out of 313 total ovarian cancer diagnosed in Hospital Materno-Infantil Vall d'Hebredn between 1975 and 1994 are present. RESULTS: Mean age of the patients was 36 years. The most frequent symptom at diagnosis was abdominal bloating (44.5%). Echography was the most used diagnostic method (67%). Surgery was conservative in 44% of the cases, radical in 50% of the cases and palliative in one case. The histological types were 6 dysgerminomas and 6 malignant teratomas (33.3%), 3 malignant dermoid cysts (16.7%), 2 yolk sac tumors (11%) and 1 embryonal carcinoma. According to FIGO 1987 staging classification 14 patients were in stage I disease and 4 in stage III disease. Polychemotherapy was performed on 6 patients and postsurgical radiotherapy was performed on 2 patients. Five patients recurred in an average time of 25 months. The five-year survival rate, according to the Kaplan-Meier method, was 80% in stage I and 0% in stage III. Five-year survival rate of patients only surgically treated was 65% and in patients who underwent postsurgical co-adjuvant treatment it was 100%. CONCLUSION: Conservative surgery followed by a BEP regimen may be performed nowadays with efficacy and acceptable toxicity while conserving the fertility of these patients.

Adolescent↗