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  5. Of mice and men (and dogs!): xenogeneic DNA vaccines for the treatment of Canine Malignant Melanoma
European Veterinary Conference - Voorjaarsdagen
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Of mice and men (and dogs!): xenogeneic DNA vaccines for the treatment of Canine Malignant Melanoma

Author(s):
Bergman P. J.
In: EVC - Voorjaarsdagen - The Hague, 2017 by European Veterinary Conference - Voorjaarsdagen
Updated:
JUL 05, 2017
Languages:
  • EN
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    Introduction

    Canine malignant melanoma (CMM) of the oral cavity, nail bed, foot pad and mucocutaneous junction is a spontaneously occurring, highly aggressive and frequently metastatic neoplasm. CMM is a relatively common diagnosis representing ~ 4% of all canine tumors and it is the most common oral tumor in the dog. CMM and advanced human melanoma (HM) are diseases that are initially treated with aggressive local therapies including surgery and/or fractionated radiation therapy; however, systemic metastatic disease is a common sequela. Based on these similarities, CMM appears to be a good clinical model for evaluating new treatments for advanced HM. Canine patients with advanced disease (WHO stage II, III or IV) have a reported median survival time of 1-5 months with standardized therapies. A combination of hypofractionated radiation therapy and chemotherapy have a reported median survival time of one year in stage I oral CMM. Human patients with deep AJCC stage II or stage III disease (locally advanced or regional lymph node involvement) have at least a 50% chance of recurrence after surgical resection; patients with stage IV melanoma (distant metastases) have a median survival of less than ten months and most of these patients eventually die of melanoma. Standard systemic therapy is dacarbazine chemotherapy in HM, and carboplatin chemotherapy in CMM. Unfortunately, response rates to chemotherapy in humans or dogs with advanced melanoma range from 8-28% with little evidence that treatment improves survival. It is easily evident that new approaches to this disease are desperately needed and multiple methodologies have been reported to date.

    Active immunotherapy in the form of vaccines represents one potential therapeutic strategy for melanoma. The advent of DNA vaccination circumvents some of the previously encountered hurdles in vaccine development. DNA is relatively inexpensive and simple to purify in large quantity. The antigen of interest is cloned into a bacterial expression plasmid with a constitutively active promoter. The plasmid is introduced into the skin or muscle with an intradermal or intramuscular injection. Once in the skin or muscle, professional antigen presenting cells, particularly dendritic cells, are able to present the transcribed and translated antigen in the proper context of major histocompatibility complex and costimulatory molecules. The bacterial and plasmid DNA itself contains immunostimulatory sequences that may act as a potent immunological adjuvant in the immune response. In clinical trials for infectious disease, DNA immunization has been shown to be safe and effective in inducing immune responses to malaria and human immunodeficiency virus. Although DNA vaccines have induced immune responses to viral proteins, vaccinating against tissue specific self-proteins on cancer cells is clearly a more difficult problem. One way to induce immunity against a tissue specific differentiation antigen on cancer cells is to vaccinate with xenogeneic antigen or DNA that is homologous to the cancer antigen. It has been shown that vaccination of mice with DNA encoding cancer differentiation antigens is ineffective when self-DNA is used, but tumor immunity can be induced by orthologous DNA from another species.

    We have chosen to target defined melanoma differentiation antigens of the tyrosinase family. Tyrosinase is a melanosomal glycoprotein, essential in melanin synthesis. The full length human tyrosinase gene was shown to consist of five exons and was localized to chromosome 11q14-q21. Immunization with xenogeneic human DNA encoding tyrosinase family proteins induced antibodies and cytotoxic T cells against syngeneic B16 melanoma cells in C57BL/6 mice, but immunization with mouse tyrosinase-related DNA did not induce detectable immunity. In particular, xenogeneic DNA vaccination induced tumor protection from syngeneic melanoma challenge and autoimmune hypopigmentation. Thus, xenogeneic DNA vaccination could break tolerance against a self tumor differentiation antigen, inducing antibody, T-cell and anti-tumor responses.

    [...]

    https://voorjaarsdagen.eu/file/2019/07/Philip-J.-Bergman-CA-OF-MICE-MEN-AND-DOGS-XENOGENEIC-DNA-VACCINES-FOR-THE-TREATMENT-OF.pdf
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    About

    How to reference this publication (Harvard system)?

    Bergman, P. J. (2021) “Of mice and men (and dogs!): xenogeneic DNA vaccines for the treatment of Canine Malignant Melanoma”, EVC - Voorjaarsdagen - The Hague, 2017. Available at: https://www.ivis.org/library/evc/evc-voorjaarsdagen-hague-2017/of-mice-and-men-and-dogs-xenogeneic-dna-vaccines-for-treatment-of-canine-malignant-melanoma (Accessed: 24 March 2023).

    Author(s)

    • Bergman

      Bergman P. J.

      Veterinary Specialist in Oncology
      DVM, MS, PHD, DACVIM - Oncology
      Katonah Bedford Veterinary Center,
      Read more about this author

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    Every spring the European Veterinary Conference Voorjaarsdagen is organized. Important goals of the Voorjaarsdagen Conference are to build friendships between veterinarians at a national and international level, to enhance the quality and availability of veterinary medicine and surgery, and to foster the exchange of scientific information among veterinarians.

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