title: Immunohistochemical analysis of equine pulmonary granular cell tumours.
abstract: Histopathological and immunohistochemical examinations were made on four female horses aged 9-12 years with pulmonary granular cell tumours (GCTs). The tumours, which were multiple, of varying size, firm and off-white in colour, surrounded the bronchi and bronchioles. Metastatic lesions were not detected. The tumour cells had abundant eosinophilic cytoplasm filled with prominent coarse eosinophilic granules. Immunohistochemically, these tumour cells reacted uniformly with vimentin and S100 antibodies. Most were immunolabelled by antibodies against glial fibrillary acidic protein (GFAP), myelin basic protein (MBP) and protein gene product 9.5 (PGP9.5), and a few cells were positive with Leu7 antibody. However, the tumour cells did not react with antibodies against neurofilament protein (NF), cytokeratin (CK), chromogranin, alpha1 antichymotrypsin (AACT), myoglobin, desmin, alpha-actin or alpha-smooth muscle actin (alpha-SMA). These immunohistochemical properties of tumour cells support the hypothesis that equine pulmonary GCTs are derived from Schwann cells of the peripheral nervous system in peribronchial and peribronchiolar tissues. GFAP, MBP, Leu7 and PGP9.5 antibodies should help to distinguish equine granular cell tumours from other tumours.
authors.affiliation: Department of Veterinary Pathology, School of Veterinary Medicine, Rakuno Gakuen University, Bunkyodai-Midorimachi 582-1, Ebetsu, Hokkaido 069-8501, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kagawa
authors.forename: K
authors.initials: K
authors.lastname: Hirayama
authors.forename: M
authors.initials: M
authors.lastname: Tagami
authors.forename: N
authors.initials: N
authors.lastname: Tsunoda
authors.forename: T
authors.initials: T
authors.lastname: Yoshino
authors.forename: T
authors.initials: T
authors.lastname: Matsui
authors.forename: H
authors.initials: H
authors.lastname: Furuoka
authors.forename: H
authors.initials: H
authors.lastname: Taniyama
mesh_terms: D000818:Animals; D014408:Biomarkers, Tumor / Q000378:metabolism; D005260:Female; D016586:Granular Cell Tumor / Q000737:chemistry / Q000473:pathology / Q000662:veterinary*; D006734:Horse Diseases / Q000378:metabolism / Q000473:pathology*; D006736:Horses; D006801:Humans; D007124:Immunoenzyme Techniques / Q000662:veterinary; D008175:Lung Neoplasms / Q000737:chemistry / Q000473:pathology / Q000662:veterinary*; D009363:Neoplasm Proteins / Q000378:metabolism; D013045:Species Specificity
chemical_list: D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins