title: Effect of noscapine and vincristine combination on demyelination and cell proliferation in vitro.
abstract: Peripheral neuropathy is a common, dose-limiting side effect of vincristine, a frontline therapy for acute lymphoblastic leukemia. Combination chemotherapy that reduces the neurotoxicity without compromising the efficacy of vincristine would improve patient outcomes. We performed in vitro studies using a combination of microtubule-binding antimitotics, noscapine and vincristine. In cell cultures containing neurons, astrocytes, and oligodendrocytes, vincristine caused demyelination as shown by transmission electron microscopy. A combination of vincristine and noscapine protected against demyelination. Human acute lymphoblastic and acute myelogenous leukemia cell lines CCRF-CEM and HL-60, respectively, were used to determine the antiproliferative effect of this novel drug combination. Vincristine and noscapine decreased cell proliferation with IC(50) concentrations of 1 nM and 20 microM, respectively. Analysis of dose-effect relationships using isobolograms and combination indices demonstrated that noscapine acts synergistically with vincristine. Thus, noscapine is a promising candidate for use with vincristine to decrease neurotoxicity and enhance antineoplastic effectiveness.
authors.affiliation: School of Nursing, University of Mississippi Medical Center, Jackson, MS 39216-4505, USA. lmhiser@son.umsmed.edu
authors.forename: Laree
authors.initials: L
authors.lastname: Hiser
authors.forename: Betty
authors.initials: B
authors.lastname: Herrington
authors.forename: Sharon
authors.initials: S
authors.lastname: Lobert