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      Regulatable Transgene Expression for Prevention of Chemotherapy-Induced Peripheral Neuropathy

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          Abstract

          Chemotherapy-induced peripheral neuropathy (CIPN) is a debilitating complication associated with drug treatment of cancer for which there are no effective strategies of prevention or treatment. In this study, we examined the effect of intermittent expression of neurotophin-3 (NT-3) or interleukin-10 (IL-10) from replication-defective herpes simplex virus (HSV)-based regulatable vectors delivered by subcutaneous inoculation to the dorsal root ganglion (DRG) on the development of paclitaxel-induced peripheral neuropathy. We constructed two different tetracycline (tet)-on-based regulatable HSV vectors, one expressing NT-3 and the other expressing IL-10, in which the transactivator expression in the tet-on system was under the control of HSV latency-associated promoter 2 (LAP-2), and expression of the transgene was controlled by doxycycline (DOX). We examined the therapeutic effect of intermittent expression of the transgene in animals with paclitaxel-induced peripheral neuropathy modeled by intraperitoneal injection of paclitaxel (16 mg/kg) once a week for 5 weeks. Intermittent expression of either NT-3 or IL-10 3 days before and 1 day after paclitaxel administration protected animals against paclitaxel-induced peripheral neuropathy over the course of 5 weeks. These results suggest the potential of regulatable vectors for prevention of chemotherapy-induced peripheral neuropathy.

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          Studies of peripheral sensory nerves in paclitaxel-induced painful peripheral neuropathy: evidence for mitochondrial dysfunction.

          Paclitaxel chemotherapy frequently induces neuropathic pain during and often persisting after therapy. The mechanisms responsible for this pain are unknown. Using a rat model of paclitaxel-induced painful peripheral neuropathy, we have performed studies to search for peripheral nerve pathology. Paclitaxel-induced mechano-allodynia and mechano-hyperalgesia were evident after a short delay, peaked at day 27 and finally resolved on day 155. Paclitaxel- and vehicle-treated rats were perfused on days 7, 27 and 160. Portions of saphenous nerves were processed for electron microscopy. There was no evidence of paclitaxel-induced degeneration or regeneration as myelin structure was normal and the number/density of myelinated axons and C-fibres was unaltered by paclitaxel treatment at any time point. In addition, the prevalence of ATF3-positive dorsal root ganglia cells was normal in paclitaxel-treated animals. With one exception, at day 160 in myelinated axons, total microtubule densities were also unaffected by paclitaxel both in C-fibres and myelinated axons. C-fibres were significantly swollen following paclitaxel at days 7 and 27 compared to vehicle. The most striking finding was significant increases in the prevalence of atypical (swollen and vacuolated) mitochondria in both C-fibres (1.6- to 2.3-fold) and myelinated axons (2.4- to 2.6-fold) of paclitaxel-treated nerves at days 7 and 27. Comparable to the pain behaviour, these mitochondrial changes had resolved by day 160. Our data do not support a causal role for axonal degeneration or dysfunction of axonal microtubules in paclitaxel-induced pain. Instead, our data suggest that a paclitaxel-induced abnormality in axonal mitochondria of sensory nerves contributes to paclitaxel-induced pain.
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            Taxol: a unique antineoplastic agent with significant activity in advanced ovarian epithelial neoplasms.

            To assess the activity of taxol in patients with advanced, progressive, and drug-refractory ovarian cancer and to delineate more clearly the toxicity of taxol in this patient population. Nonrandomized, prospective phase II trial. Forty-seven patients with drug-refractory epithelial ovarian cancer who had one or more lesions measurable in perpendicular diameters. Of these patients, 45 were evaluable for toxicity and 40 were evaluable for response. PATIENTS were treated every 22 days with varying doses of taxol (110 to 250 mg/m2 body surface) given as a 24-hour infusion with subsequent doses based on adverse effects. A premedication regimen was used to avoid acute hypersensitivity reactions. Twelve patients (30%; CI, 16% to 44%) responded to taxol for periods lasting from 3 to 15 months. The dose-limiting toxicity was myelosuppression with leukocytes affected more severely and commonly than thrombocytes or reticulocytes. Leukopenia was usually brief in duration but was associated with sepsis in 3 cases (2 fatal). Other adverse effects included myalgias, arthralgias, alopecia, diarrhea, nausea, vomiting, mucositis, and peripheral neuropathy. Rare cases of cardiac and central neurotoxicity were also noted. Taxol is an active agent in drug-refractory ovarian cancer and deserves further study in combination with other active drugs in previously untreated patients with advanced ovarian cancer.
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              Phase II trial of taxol, an active drug in the treatment of metastatic breast cancer.

              Taxol, an antimicrotubule agent, has shown promise for efficacy in treatment of breast cancer, but severe hypersensitivity reactions led to cessation of many phase I clinical trials. Consequently, investigators and the National Cancer Institute recommended that phase I and II studies of this agent use 24-hour infusions and antiallergic medications. Using a premedication regimen effective in preventing hypersensitivity reactions, we have performed a phase II trial of taxol in patients with metastatic breast cancer. Taxol was administered to 25 patients at a dose of 250 mg/m2 by 24-hour infusion every 21 days. These patients had received only one prior chemotherapy regimen, either adjuvant to surgery or for metastatic disease; all but two had received doxorubicin. In 60% of the patients, the dominant site of disease was the viscera. All patients were assessable. In April 1991, at a median time on study of 9 months (range, 5-13+ months), the objective response rate was 56% (12% complete and 44% partial; 95% confidence interval, 35%-76%). Disease progressed in only 8% of the patients. The median number of courses of therapy was 11. Granulocytopenia was the dose-limiting toxic effect, but neutropenia with fever occurred in only 5% of 232 courses. A chronic glove-and-stocking neuropathy developed in most patients, but no allergic reactions occurred. We conclude that taxol is an active agent in the treatment of metastatic breast cancer and that it warrants continued study. Currently, we are conducting a phase I trial of taxol plus doxorubicin. Future trials should address the optimal effective dose, the optimal sequencing of combinations, mechanisms of drug resistance in tumors, and dose-limiting toxic effects (particularly cardiac toxic effects of taxol given as a single agent or in drug combinations).
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                Author and article information

                Contributors
                Journal
                Mol Ther Methods Clin Dev
                Mol Ther Methods Clin Dev
                Molecular Therapy. Methods & Clinical Development
                American Society of Gene & Cell Therapy
                2329-0501
                21 June 2017
                15 September 2017
                21 June 2017
                : 6
                : 91-101
                Affiliations
                [1 ]Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA
                [2 ]VA Ann Arbor Healthcare System, Ann Arbor, MI 48109, USA
                [3 ]Department of Anesthesiology, Asahikawa Medical University, Higashi Asahikawa 078-8510, Japan
                Author notes
                []Corresponding author: Zetang Wu, Department of Neurology, University of Michigan, Room 5238, BSRB, 109 Zina Pitcher Place, Ann Arbor, MI 48109, USA. zetang@ 123456umich.edu
                Article
                S2329-0501(17)30079-7
                10.1016/j.omtm.2017.06.004
                5496212
                6bb0d500-e7ab-4ebd-aa9e-d7f58de16a06
                © 2017 The Author(s)

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                : 12 January 2017
                : 16 June 2017
                Categories
                Original Article

                chemotherapy,peripheral neuropathy,neuroprotective peptides,intermittent expression,therapeutic effect

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