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Vet Pathol 43:773-776 (2006)
© 2006 American College of Veterinary Pathologists
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Immunohistochemical Detection of Ym1/Ym2 Chitinase-like Lectins Associated with Hyalinosis and Polypoid Adenomas of the Transitional Epithelium in a Mouse with Acute Myeloid Leukemia

F. Marchesi, S. Minucci, P. G. Pelicci, A. Gobbi and E. Scanziani

Abstract

An 8-month-old PML/RAR{alpha} knock-in female mouse developed a promyelocytic-like myeloid leukemia with an expected latency. At necropsy, besides the typical findings associated with myeloid leukemia, a severe unilateral hydronephrosis was observed. By histopathologic examination, 2 polypoid adenomas arising from the transitional epithelium of the renal pelvis and ureter were detected. The epithelial cells of the polypoid adenomas showed accumulation of hyaline eosinophilic material within the cytoplasm. Large amounts of extracellular eosinophilic crystals were also associated with the transitional cell adenomas. Immunohistochemical analysis revealed that the eosinophilic intracytoplasmic material and the extracellular eosinophilic crystals were composed of Ym proteins. A unilateral hyaline droplet tubular nephropathy was associated with the myeloid leukemia. Expression of Ym proteins characterized both the neoplastic myeloid infiltrates and the tubular hyaline droplets. In the present PML/RAR{alpha} knock-in female mouse, the accumulation of Ym proteins associated with the myeloid leukemia and with the polypoid adenomas of the transitional epithelium underlies 2 distinct pathogenetic mechanisms.

Key words: Myeloid leukemia; polypoid adenomas; transitional epithelium; Ym proteins.

Request reprints from Francesco Marchesi, Dipartimento di Patologia Animale, Igiene e Sanità Pubblica Veterinaria, Sezione di Anatomia Patologica Veterinaria e Patologia Aviare, Università degli Studi di Milano, Via Celoria 10, 20133 Milano (Italy). E-mail: francesco.marchesi{at}unimi.it






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