Increased abundance of bIIand bIII-tubulin isotypes in cancer cells confers resistance to vinca and taxoid site drugs; however, the role of these isotypes in the acquired resistance of cancer cells to non-vinca or nontaxoid site binding agents has not been described. Peloruside A (PLA) and laulimalide are the only known non-taxoid site microtubule-stabilizing agents. A human ovarian cancer cell...

Aberrant expression of B-tubulin isotypes is frequently described in tumor tissues and tubulin-binding agent (TBA)–resistant cell lines. There is limited understanding of the role of specific B-tubulin isotypes in cellular sensitivity to TBAs, and to gain insights into the functional role of BIIand BIVb-tubulin, we examined these isotypes in lung cancer cell lines NCI-H460 (H460) and Calu-6. Dr...

to those exhibited by xanthophyll cycle-dependent energy dissipation. The patterns of acclimation of The acclimation of photochemistry, xanthophyll cycleglutathione reductase are discussed in the context of dependent energy dissipation, and antioxidants was the multiple roles for reduced glutathione. Catalase characterized in leaves of Cucurbita pepo L. and Vinca acclimated in a manner consiste...

Leukemia affects the central and peripheral nervous system. Neurologic complications are a consequence of direct leukemic infiltration, as occurs with leukemic meningitis, and due to complications of either antileukemic treatment (thrombocytopenic or disseminated intravascular coagulation-related intracranial hemorrhage, steroid myopathy, vinca alkaloid peripheral neuropathy) or immune compromi...

Three patients receiving vincristine or binblastine developed recurrent laryngeal nerve paralysis, which resolved when the drug was withdrawn. The presence of mediastinal lymphadenopathy in patients with lymphoma may obscure the correct diagnosis, with the danger that the condition will produce respiratory distress if vinca alkaloid treatment is continued.

The ability of a class of C-20' modified vinca alkaloid congeners to induce tubulin spiral formation was investigated relative to their ability to inhibit microtubule assembly, their cytotoxicity against a leukemic cell line, L1210, and their measured and calculated partition coefficients. These studies were prompted by the observation that the energetics of vinca alkaloid-induced tubulin spira...

HTI-286, a synthetic analogue of hemiasterlin, depolymerizes microtubules and is proposed to bind at the Vinca peptide site in tubulin. It has excellent in vivo antitumor activity in human xenograft models, including tumors that express P-glycoprotein, and is in phase II clinical evaluation. To identify potential mechanisms of resistance induced by HTI-286, KB-3-1 epidermoid carcinoma cells wer...

PURPOSE When evaluated in patients with ovarian and other cancer, vintafolide (EC145), a potent folate-targeted vinca alkaloid conjugate, displayed a toxicity profile that seemed to be nonoverlapping with many standard-of-care cancer therapeutics. It was, therefore, hypothesized that combining vintafolide with certain approved anticancer drugs may afford greater therapeutic efficacy compared wi...

Oral administration of water fraction of alcoholic extract of leaves of Vinca rosea (fam. apocynaeceae) led to marked lowering of blood glucose level in normal and streptozotocin induced diabetic rats. The hypoglycemic effect of the fraction was comparable with that of tolbutamide.

The neurotoxicity of the vincristine is well known, however, cranial neuropathy is not widely recognized. We describe a child with acute lymphoblastic leukemia who developed vincristine-induced bilateral vocal cord paralysis. Vocal cord paralysis resolved spontaneously upon withdrawal of the vincristine. Vinca-alkaloid-induced vocal cord paralysis is a potentially dangerous but reversible condi...