Article

Interaction of Vinca Alkaloids with Tubulin: A Comparison of Vinblastine, Vincristine, and Vinorelbine †

School of Nursing, University of Mississippi Medical Center, Jackson 39216, USA.
Biochemistry (Impact Factor: 3.02). 06/1996; 35(21):6806-14. DOI: 10.1021/bi953037i
Source: PubMed

ABSTRACT

Vinca alkaloids are antimitotic drugs that inhibit microtubule assembly and induce tubulin self-association into coiled spiral aggregates. Previous sedimentation velocity results with vinblastine have been interpreted by a mechanism involving isodesmic ligand-mediated or ligand-mediated plus ligand-facilitated self-association [Lobert et al. (1995) Biochemistry 34, 8050-8060]. In this study, we compare the vincristine- or vinorelbine-induced self-association of porcine brain tubulin with our prior vinblastine studies in the presence of 50 microM GDP or 50 microM GTP. Vincristine demonstrates the highest overall affinity for tubulin, K1K2, and vinorelbine the lowest (vincristine > vinblastine > vinorelbine). These and the first quantitative studies comparing the interaction of a new vinca alkaloid derivative, vinorelbine (Navelbine), with other vinca alkaloids. The relative binding affinities reported here correlate with the weekly drug doses used clinically in cancer chemotherapy, where vincristine is used at the lowest dosages and vinorelbine at the highest. Surprisingly, K1, the affinity of drug for tubulin heterodimers, is identical for all three drugs. When data are fit with the ligand-mediated model, the differences in overall affinity are due to effects on K2, the affinity of liganded heterodimers for spiral polymers. When data are fit with the ligand-mediated plus-facilitated model, affinity differences are also reflected in K3, the binding of the drug to unliganded polymers. We find that GDP enhances self-association in the presence of all three drugs 3-5-fold over GTP. The enhancement is manifested in K2 and K3 and amounts to an average of 0.90 +/= 0.17 kcal/mol. Thus, nucleotide enhancement is linked to the self-association step. Data collected at 5, 25, and 36 degrees C for all three drugs show increased maximum s-20,w values with increasing temperature and are consistent with an entropically driven reaction for the overall process. To investigate these results further, stopped-flow light scattering experiments have been conducted. Relaxation times are longest for the largest vincristine polymers and shortest for the smallest vinorelbine polymers, consistent with a cascade of events corresponding to successive dissociation events from spiral polymers, the larger the polymers the longer the relaxation time. Relaxation times for any single drug decrease with increasing tubulin concentration, consistent with the occurrence of oligomer annealing in addition to the association of liganded heterodimers to the ends of the growing spirals. Relaxation times were used to estimate on and off rates for liganded heterodimer association with spirals, and their ratio gives affinity constants (Kapp) that are independently consistent with K2 estimates from sedimentation velocity results for vinblastine and vinorelbine. For vincristine-induced tubulin polymers, a two-step process is observed with a second relaxation time more than 20-fold longer than times observed for vinblastine or vinorelbine. Sedimentation velocity experiments at low speeds and electron microscopy are consistent with the presence of a small amount of larger polymers (> or = 40S) in the vincristine samples, possibly involving alignment of spirals. Under our experimental conditions, these larger polymers appear to have a minimal effect on the estimated energetics of the vincristine-induced self-association of tubulin.

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Available from: John Correia, Aug 24, 2015
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    • "Therefore, tubulin represents a promising drug target to inhibit cell proliferation [4]. Several antimitotic agents that are currently in clinical use as chemotherapies, including vincristine, vinblastine [5] and epothilones [6], exert their action by interrupting the dynamic instability of microtubules by inhibiting either tubulin polymerization or depolymerization through the stabilization of microtubules [7] [8]. Among the drugs that modify the cytoskeleton, colchicine depolymerizes microtubules at mM concentrations [9] [10], and it perturbs microtubule dynamics in the nM concentration range [11]. "
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    ABSTRACT: Dihydroxynaphthyl aryl ketones 1-5 have been evaluated for their abilities to inhibit microtubule assembly and the binding to tubulin. Compounds 3, 4 and 5 displayed competitive inhibition against colchicine binding, and docking analysis showed that they bind to the tubulin colchicine-binding pocket inducing sheets instead of microtubules. Remarkable differences in biological activity observed among the assayed compounds seem to be related to the structure and position of the aryl substituent bonded to the carbonyl group. Compounds 2, 3 and 4, which contain a heterocyclic ring, presented higher affinity for tubulin compared to the carbocyclic analogue 5. Compound 4 showed the best affinity of the series, with an IC50 value of 2.1 μM for microtubule polymerization inhibition and a tubulin dissociation constant of 1.0 ± 0.2 μM, as determined by thermophoresis. Compound 4 was more efficacious in disrupting microtubule assembly in vitro than compound 5 although it contains the trimethoxyphenyl ring present in colchicine. Hydrogen bonds with Asn101 of α-tubulin seem to be responsible for the higher affinity of compound 4 respects to the others.
    Full-text · Article · Sep 2015 · Biochemical and Biophysical Research Communications
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    • "Antitubulin vinca alkaloids prevent tubulin polymerization from soluble dimers into microtubules. The affinity for tubulin differs among vinca-alkaloid compounds (decreasing in order vincristine , vinblastine, vinorelbine), which might explain the distinct neurotoxic profiles of these drugs [37]. Vincristine is the most neurotoxic one, vinblastine, and vinorelbine are less neurotoxic. "
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    ABSTRACT: Chemotherapy induced peripheral neuropathy (CIPN) is a potentially dose limiting side effect of commonly used chemotherapeutic agents like taxanes, vinca-alkaloids, platinum compounds, bortezomib and thalidomide. Supposed pathogenetic mechanisms of CIPN are axonopathy through dying back axon damage and neuronopathy in which the cell bodies of the dorsal root ganglia are involved. The exact pathophysiology however is not clear and different underlying mechanisms have been proposed for different classes of anti-cancer drugs. Sensory symptoms, like pain, numbness and tingling are most common, but motor weakness, autonomic dysfunction and even cranial nerve involvement may occur. CIPN can be painful and/or disabling, causing significant loss of functional abilities and decreasing quality of life. This can lead to dose reductions, discontinuation of treatment and may thus, ultimately, affect survival. Risk factors for CIPN include dose per cycle, cumulative dose, treatment schedule, duration of infusion, administration of other chemotherapeutics, comorbidity and pre-existing peripheral neuropathy. The exploration of polymorphisms in genes associated with incidence or severity of neuropathy might result in identifying individuals being at higher risk of neurotoxicity. An update on genes possibly associated with CIPN is given. CIPN may be reversible or be more or less permanent. Many preventive and treatment strategies have been explored, without significant efficacy up till now. In this review we describe the different drug-related characteristics of CIPN, pharmacogenomic studies, neurophysiological findings, treatment and outcome, and neuroprotective strategies.
    Full-text · Article · Aug 2014 · Cancer Treatment Reviews
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    • "The incidence and severity of vincristine-induced neuropathic pain is positively correlated with the duration of treatment and doses used. The anti-tumour action of vincristine is due to its high binding affinity to β-tubulin, leading to aborted cell division and cell death (Wilson et al. 1975; Lobert et al. 1996). An animal model of vincristine-induced nociceptive sensory neuropathy was previously developed and behaviourally characterized (Aley et al. 1996; Nozaki-Taguchi et al. 2001; Authier et al. 2003). "
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    ABSTRACT: Vincristine is one of the most common anti-cancer drug therapies administered for the treatment of many types of cancer. Its dose-limiting side effect is the emergence of peripheral neuropathy, resulting in chronic neuropathic pain in many patients. This study sought to understand the mechanisms underlying the development of neuropathic pain by vincristine-induced neurotoxicity. We focused on signs of functional changes and revealed that deep layers of the spinal cord (III-IV) experience increased neuronal activity both in the absence of peripheral stimulation and, as a result of tactile mechanical stimulations. These laminae and superficial laminae I-II were also subject to structural changes as evidenced by an increase in immunoreactivity of Piccolo, a marker of active presynaptic elements. Further investigations performed, using DNA microarray technology, describe a large number of genes differentially expressed in dorsal root ganglions and in the spinal dorsal horn after vincristine treatment. Our study describes an important list of genes differentially regulated by vincristine treatment that will be useful for future studies and brings forward evidence for molecular and anatomical modifications of large diameter sensory neurons terminating in deep dorsal horn laminae, which could participate in the development of tactile allodynia.
    Full-text · Article · Aug 2013 · Journal of Molecular Neuroscience
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