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Volume 30 , Issue 1
Winter 2016

Pages 42–50

Efficacy of Herpes Simplex Virus Vector Encoding the Human Preproenkephalin Gene for Treatment of Facial Pain in Mice

Fei Ma, MD, PhD/Chunmei Wang, MS/William E. Yoder, DMD/Karin N. Westlund, PhD/Charles R. Carlson, PhD/Craig S. Miller, DMD, MS/Robert J. Danaher, PhD

PMID: 26817032
DOI: 10.11607/ofph.1512

Aims: To determine whether herpes simplex virus–based vectors can efficiently transduce mouse trigeminal ganglion (TG) neurons and attenuate preexisting nerve injury–induced whisker pad mechanical hypersensitivity in a trigeminal inflammatory compression (TIC) neuropathic pain model. Methods: Tissue transduction efficiencies of replication-conditional and replication-defective vectors to mouse whisker pads after topical administration and subcutaneous injection were assessed using quantitative real-time PCR (qPCR). Tissue tropism and transgene expression were assessed using qPCR and reverse-transcriptase qPCR following topical application of the vectors. Whisker pad mechanical sensitivities of TIC-injured mice were determined using graduated von Frey fibers before and after application of human preproenkephalin expressing replicationconditional vector (KHPE). Data were analyzed using one-way analysis of variance (ANOVA) and post hoc tests. Results: Transduction of target TGs was 8- to 50- fold greater after topical application than subcutaneous injection and ≥ 100-fold greater for replication-conditional than replication-defective vectors. Mean KHPE loads remained constant in TGs (4.5–9.8 × 104

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