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The origin and role of autophagy in the formation of cytoplasmic granules in canine lingual granular cell tumors.
Suzuki, S; Uchida, K; Harada, T; Nibe, K; Yamashita, M; Ono, K; Nakayama, H.
Afiliación
  • Suzuki S; Department of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, the University of Tokyo, Bunkyo-ku, Tokyo, Japan.
  • Uchida K; Department of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, the University of Tokyo, Bunkyo-ku, Tokyo, Japan auchidak@mail.ecc.u-tokyo.ac.jp.
  • Harada T; Department of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, the University of Tokyo, Bunkyo-ku, Tokyo, Japan.
  • Nibe K; Japan Animal Referral Medical Center, Takatsu-ku, Kawasaki-shi, Kanagawa, Japan.
  • Yamashita M; Japan Animal Referral Medical Center, Takatsu-ku, Kawasaki-shi, Kanagawa, Japan.
  • Ono K; Japan Animal Referral Medical Center, Takatsu-ku, Kawasaki-shi, Kanagawa, Japan.
  • Nakayama H; Department of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, the University of Tokyo, Bunkyo-ku, Tokyo, Japan.
Vet Pathol ; 52(3): 456-64, 2015 May.
Article en En | MEDLINE | ID: mdl-25161210
Granular cell tumors (GCTs) are histologically characterized by polygonal neoplastic cells with abundant eosinophilic cytoplasmic granules. In humans, these cells are considered to be derived from Schwann cells, and the cytoplasmic granules are assumed to be autophagosomes or autophagolysosomes. However, the origin and nature of the cytoplasmic granules in canine GCTs have not been well characterized. The present study examined 9 canine lingual GCTs using immunohistochemistry, transmission electron microscopy (TEM), and cell culture and xenotransplantation experiments. In some cases, the tumor cells expressed S100, CD133, and desmin. The cytoplasmic granules were positive for LC3, p62, NBR1, and ubiquitin. TEM revealed autophagosome-like structures in the cytoplasm of the granule-containing cells. The cultured GCT cells were round to spindle shaped and expressed S100, nestin, Melan-A, CD133, LC3, p62, NBR1, and ubiquitin, suggesting that they were of neural crest origin, redifferentiated into melanocytes, and exhibited upregulated autophagy. The xenotransplanted tumors consisted of spindle to polygonal cells. Only a few cells contained cytoplasmic granules, and some had melanin pigments in their cytoplasm. The xenotransplanted cells expressed S100, nestin, Melan-A, and CD133. P62 and ubiquitin were detected, regardless of the presence or absence of cytoplasmic granules, while LC3 and NBR1 were detected only in the neoplastic cells containing cytoplasmic granules. These findings suggest that some xenotransplanted cells redifferentiated into melanocytes and that autophagy was upregulated in the cytoplasmic granule-containing cells. In conclusion, canine lingual GCTs originate from the neural crest and develop cytoplasmic granules via autophagy. In addition, the microenvironment of GCT cells affects their morphology.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Autofagia / Neoplasias de la Lengua / Tumor de Células Granulares / Gránulos Citoplasmáticos / Enfermedades de los Perros Límite: Animals Idioma: En Revista: Vet Pathol Año: 2015 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Autofagia / Neoplasias de la Lengua / Tumor de Células Granulares / Gránulos Citoplasmáticos / Enfermedades de los Perros Límite: Animals Idioma: En Revista: Vet Pathol Año: 2015 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos