The microsporidium parasitizing Inland Bearded Dragons Pogona vitticeps, and developing primarily in macrophages within foci of granulomatous inflammation of different organs, is described as a new species Encephalitozoon pogonae. Establishing the new species was based on sequencing the ITS-SSUrDNA region of the ribosomal gene and consequent SSUrDNA-inferred phylogenetic analyses, as well as on comparison of pathogenesis, host specificity, and ultrastructure among Encephalitozoon species and isolates. The new species is closely related to E. lacertae and E. cuniculi. Analysis of the literature suggests that this microsporidium has been reported previously as an unidentified microsporidian species or isolate of E. cuniculi and may represent a common infection in bearded dragons. All stages of E. pogonae develop in parasitophorous vacuoles. Uninucleate spores on methanol-fixed smears measured 2.1 × 1.1 μm, range 1.7-2.6 × 0.9-1.7 μm; on ultrathin sections spores measured 0.8-1.1 × 1.8-2.2 μm. Ultrastructural study revealed 3-6 polar filament coils, a mushroom-shaped polar disk, and a polar sac embracing half of the volume occupied by the lamellar polaroplast. In activated spores, polar filament everted eccentrically. The overall morphology and intracellular development of E. pogonae were similar to other Encepahalitozoon spp. We also review the existing data on microsporidia infecting reptiles.

The rhodophyte seaweed Porphyra yezoensis, known more commonly world-wide as "nori", is an important commercial crop in Japan. Cultivation of nori in Japan is often affected by outbreaks of "iroochi", a discoloration of the thalli due to a decrease in inorganic nutrients in the culture area that in turn decreases the amount of photosynthetic pigments in the thalli. Treating thalli with inorganic nitrogen can reverse iroochi. In this paper, we report on the characterization of three P. yezoensis genes, a nitrate transporter (PyNRT2) and two urea transporters (PyUT1 and PyUT2), which may be involved in reversing iroochi. The predicted length of the PyNRT2 protein was 479 amino acids (AA), while PyUT1 and PyUT2 were 740 and 680 AA, respectively. PyNRT2 was more similar to NRT2 from a chromophyte than to NRTs from Chlamydomonas and higher plants. The two P. yezoensis UTs had 56% AA identity to each other, and showed the closest relationship to higher plant and yeast DUR3 proteins which formed a subfamily of the sodium-solute symporter protein family. Hydrophobicity plots of the AA sequences showed that the PyNRT2, PyUT1, and PyUT2 included 12, 15, and 16 transmembrane domains, respectively. Southern blot analysis indicated that the P. yezoensis genome has a single NRT2-encoding gene and at least four UT-encoding genes. Expression analysis of PyNRT2 and PyUT genes showed that the messenger RNA level of the PyNRT2 gene reached a maximum after 48 h in the nitrate starvation condition and was then restored to the constitutive level, while expression of the PyUT genes was induced in proportion to treatment times in the nitrate starvation condition. These results suggest that the PyNRT2 and PyUT are responsible for the high-affinity nitrate/urea transport systems that operate under low external nitrate concentrations.

ABSTRACT. A lymphoplasmacytic lymphoma was diagnosed in a 12-year-old domestic cat that had a primary cutaneous mass involving the stomach, liver, kidneys, heart, abdominal wall, diaphragm, bone marrow and several lymph nodes. Histopathologically, the most characteristic feature of this tumor was the heterogeneity of cell components, such as small lymphocytes, well-differentiated plasma cells and plasmacytoid transformed lymphocytes. Amyloid was deposited in the skin, stomach, and several lymph nodes. Immunohistochemically, neoplastic small lymphocytes were positive for CD20, and well-differentiated plasma cells and plasmacytoid transformed lymphocytes were positive for -Ig light chains and MUM1/IRF-4. These results emphasize the importance of lymphoplasmacytic lymphoma as a differential diagnosis of extramedullary cutaneous plasmacytoma in cats.KEY WORDS: feline, lymphoplasmacytic lymphoma, skin.

ABSTRACT. A 5-year-old female miniature dachshund presenting with persistent vomiting and diarrhea had two concurrent rare pathological conditions: systemic candidiasis and mesenteric mast cell tumor with multiorgan metastases. Neoplastic mast cells formed mass in the mesentery of the cecal-colonic region and were also found in the liver, spleen, kidneys, lungs, adrenal grands, ovaries, bone marrow and other tissues. The cells had intracytoplasmic granules with metachromasia and were immunohistochemically positive for c-kit and histamine. Granulomatous lesions with fungal organisms were present in the heart, lungs, kidneys, pancreas, subserosal and surrounding adipose tissue of the duodenum, thyroid glands and mesenteric mass, and phagocytosed organisms were detected in the liver and bone marrow. Bacteriologically and immunohistochemically, the fungi were consistent with Candida albicans. KEY WORDS: candidiasis, canine, mast cell tumor.J. Vet. Med. Sci. 71(2): 229-232, 2009 Candida is a normal inhabitant of the alimentary, upper respiratory, and genital mucosa of mammals and causes oppotunistic mycosis of the mucous membranes [4,6,11]. Cutaneous infection is another manifestation. Systemic dissemination is less frequent and reports of systemic candidiasis are limited in dogs [1,3,8,9,13,16]. For the establishment of candidal infections, a variety of statuses with suppression of the host-defence mechanisms are considered as predisposing conditions [4,6,11]. Mast cell tumor (MCT) is one of the most common neoplasms in canine skin and those originating in extracutaneous organs such as the spleen, liver, and intestine were infrequently reported [5,7]. In this paper, we describe a canine case with two rare conditions, systemic candidiasis and mesenteric MCT with multiorgan metastases, and discuss the possible association between candidal dissemination and generalized MCT.A 5-year-old female miniature dachshund was brought to a veterinarian with persistent vomiting of two weeks' duration, and was administered an H2 receptor antagonist, antibiotics and corticosteroid for a month. Exploratory ventrotomy and gastrotomy revealed no causative lesions. The dog did not show an improvement in vomiting, and presented with diarrhea and progressive weight loss during the next three weeks while she was treated with an H2 receptor antagonist, antiemetic, antibiotics, corticosteroid, and parenteral alimentation via the jugular vein. A subcutaneous mass, about 1 cm in diameter, was detected at the right 5th mammary gland. Radiographs revealed an intraabdominal mass, about 5 cm in diameter, around the ileocecal junction and no abnormalities in the lung field. The ileocecal and cutaneous masses were sampled by fine needle biopsy and surgical excision, respectively. The tissues from the ileocecal mass revealed scattered cells infiltrating in collagenous tissue, but detailed morphology of the cells were not obtained due to severe artifact. The cutaneous mass was composed of proliferation of round to polygonal neoplastic cells mainly ...

ABSTRACT. A 2-year-old Thoroughbred horse presented with acute onset of colitis, and the intussuscepted jejunum was surgically resected. A transmural mass protruding into the lumen was found at the leading edge of the intussusceptum. Based on histological and immunohistochemical examinations, the mass was diagnosed as diffuse large B-cell lymphoma with metastasis to the mesenteric lymph nodes. Anatomical localization of the mass in the intussusception and absence of other obvious underlying diseases indicated that the intussusception had occurred in association with the mass. To our knowledge, this case is the first report of equine intussusception associated with focal intestinal lymphoma.