文献一覧: Masaki Michishita (著者)

3 0 0 0 OA Metabolite profiling in sphere-forming cells from canine mammary adenocarcinoma cell lines using gas chromatography-mass spectrometry

著者: Masaki MICHISHITA Namika SAITO Satoshi NOZAWA Rina FURUMOTO Takayuki NAKAGAWA Touko SATO Kazuhiko OCHIAI Daigo AZAKAMI Kinya KATAYAMA Rei NAKAHIRA Hiroyuki TAZAKI Yukino MACHIDA Toshiyuki ISHIWATA
出版者: JAPANESE SOCIETY OF VETERINARY SCIENCE
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: pp.19-0194, (Released:2019-07-15)
被引用文献数: 8

Cancer consists of heterogeneous cells that contain a small population of cells that possess stem cell properties; these cells, referred to as cancer stem cells (CSCs) or tumor-initiating cells, are involved in tumor progression and metastasis. Using a sphere-forming assay, canine mammary CSCs were found to be similar to human breast CSCs. Metabolic reprogramming has been recognized as a hallmark of various cancers. However, the significance of cellular metabolism in CSCs remains unclear. The aim of this study was to define the metabolic characteristics of CSCs derived from canine mammary tumors and gain an understanding of the maintenance of stemness. We identified metabolite profiles of canine mammary adenocarcinoma cell lines using gas chromatography-mass spectrometry. Metabolites were extracted from both adherent and sphere-forming cells derived from three cell lines. Sphere-forming cells were separated from adherent cells using an orthogonal, partial least squares discriminant analysis. Sphere-forming cells were found to contain high levels of the amino acids alanine, glycine and proline compared with adherent cells. They also had high levels of palmitoleate, palmitate and dihomo-gamma-linolenic acid compared with adherent cells. In a sphere-forming assay, palmitate increased the number of spheres for all cell lines. These results indicate that the sphere-forming cells derived from canine mammary adenocarcinoma cell lines have specific metabolic profiles that may be useful for the development of CSC-specific therapies targeting metabolic pathways and potential stemness biomarkers; these results also clarify the maintenance of stemness in canine mammary CSCs.

2019-07-18 06:43:00
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3 0 0 0 OA Leydig cell tumor in an Amur tiger (Panthera tigris altaica)

著者: Risako KAWATA Tatsuhito II Tatsuya HORI Yukino MACHIDA Kazuhiko OCHIAI Daigo AZAKAMI Toshiyuki ISHIWATA Masaki MICHISHITA
出版者: JAPANESE SOCIETY OF VETERINARY SCIENCE
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: vol.81, no.2, pp.186-189, 2019 (Released:2019-02-09)
参考文献数: 17
被引用文献数: 1

A 14-year and 8-month-old intact male Amur tiger presented with an enlarged left testis, measuring 5.7 × 5.5 × 4.5 cm. The cut surface was mottled dark red to reddish brown in color. Microscopically, the enlarged left testis comprised round or polygonal neoplastic cells arranged in a diffuse sheet pattern. These neoplastic cells had a hyperchromatic nucleus and an abundant eosinophilic cytoplasm. Immunohistochemically, these neoplastic cells were positive for vimentin, chromogranin A, synaptophysin, melan-A, inhibin-α, and S100 and negative for desmin and WT-1. Based on these morphological and immunohistochemical findings, the tumor was diagnosed as a Leydig cell tumor.

2019-03-21 04:41:26
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3 0 0 0 OA Long-term management and postmortem examination in a diabetic cat with acromegaly treated with two courses of radiation therapy

著者: Harumi SAWADA Akihiro MORI Masaki MICHISHITA Hitomi ODA Toshinori SAKO
出版者: JAPANESE SOCIETY OF VETERINARY SCIENCE
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: vol.81, no.1, pp.71-76, 2019 (Released:2019-01-08)
参考文献数: 21
被引用文献数: 3

A 12-year-old, castrated male cat with diabetes mellitus was diagnosed with acromegaly and examined with magnetic resonance imaging (enlarged pituitary gland, 8 mm); serum hormone concentrations were measured. After the first course of radiation therapy (4 Gy, 12 fractions), insulin administration was not required from day 420 after diagnosis. Enlarged pituitary tumor (8 mm) recurred, and insulin dosage amount of the cat was increased on day 1,065. The second course of radiation therapy (6 Gy, 4 fractions) was performed on day 1,201 and insulin administration was again discontinued. However, the cat died from lymphoma on day 1,397. Postmortem examination revealed pituitary adenoma. Most tumor cells were positive for chromogranin A, synaptophysin, and growth hormone immunohistochemistry. The pancreatic islet cells revealed diffuse hyperplasia. We achieved long-term successful management of an acromegalic cat with two courses of RT. However, a protocol for a second course of RT for feline recurrent pituitary tumor should be further discussed.

2019-02-22 03:37:38
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3 0 0 0 OA MicroRNA expression profiling in canine prostate cancer

著者: Masanori KOBAYASHI Akiko SAITO Yoshikazu TANAKA Masaki MICHISHITA Masato KOBAYASHI Mami IRIMAJIRI Takeharu KANEDA Kazuhiko OCHIAI Makoto BONKOBARA Kimimasa TAKAHASHI Tatsuya HORI Eiichi KAWAKAMI
出版者: 公益社団法人日本獣医学会
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: vol.79, no.4, pp.719-725, 2017 (Released:2017-04-05)
参考文献数: 32
被引用文献数: 23

Canine prostate cancer (cPCa) is an untreatable malignant neoplasm resulting in local tissue invasion and distant metastasis. MicroRNAs (miRs) are small non-coding RNAs that function as oncogenes or tumor suppressors. The purpose of this study was to characterize the expression of miRs that are altered in cPCa tissue. The expression levels of 277 mature miRs in prostatic tissue (n=5, respectively) were compared between the non-tumor and tumor groups using real-time PCR. Five miRs (miR-18a, 95, 221, 222 and 330) were up-regulated, but 14 miRs (miR-127, 148a, 205, 299, 329b, 335, 376a, 376c, 379, 380, 381, 411, 487b and 495) were down-regulated specifically in cPCa (P<0.05). These miRs have potential use as early diagnosis markers for cPCa and in miR-based therapy.

2017-04-05 22:05:13
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3 0 0 0 OA MicroRNA expression profiling in canine prostate cancer

著者: Masanori KOBAYASHI Akiko SAITO Yoshikazu TANAKA Masaki MICHISHITA Masato KOBAYASHI Mami IRIMAJIRI Takeharu KANEDA Kazuhiko OCHIAI Makoto BONKOBARA Kimimasa TAKAHASHI Tatsuya HORI Eiichi KAWAKAMI
出版者: 公益社団法人日本獣医学会
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: pp.16-0279, (Released:2017-02-27)
被引用文献数: 23

2017-02-27 23:56:53
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2 0 0 0 OA Functional alteration of canine isocitrate dehydrogenase 2 (IDH2) via an R174K mutation

著者: Shota KAWAKAMI Kazuhiko OCHIAI Yuiko KATO Masaki MICHISHITA Hinako HIRAMA Ryo OBARA Daigo AZAKAMI Masami WATANABE Toshinori OMI
出版者: 公益社団法人日本獣医学会
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: pp.17-0362, (Released:2017-11-21)

Gliomas are common intracranial neoplasias in dogs. However, the underlying pathogenic mechanisms remain unclear. In humans, isocitrate dehydrogenase 2 (IDH2) is often mutated in gliomas. Although almost human IDH2 mutations have been identified at the Arg172 codon, few studies have reported structural, functional, or mutational information for canine IDH2. In this study, we cloned the full-length canine IDH2 (cIDH2) cDNA and substituted wild type Arg174 (cIDH2 WT: corresponding to R172 of human IDH2) with Lys (cIDH2 R174K). The cIDH2 WT and R174K proteins were overexpressed in HeLa cells, and their presence was confirmed using an anti-human IDH2-WT mAb (clone: KrMab-3) and an anti-IDH2-R172K mAb (clone: KMab-1). The IDH2 activity between cIDH2 WT and cIDH2 R174K transfectants was compared by measuring the production of NADH and NADPH. NADPH production was lower for cIDH2 R174K than that for cIDH2 WT transfectants. Finally, we detected increased expression of hypoxia inducible factor-1 alpha (HIF-1α) in cIDH2 R174K transfectants. This indicates that mutations at R174 can potentially induce carcinogenesis in canine somatic cells.

2017-11-26 01:24:59
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2 0 0 0 OA Identification of tumor-initiating cells derived from two canine rhabdomyosarcoma cell lines

著者: Takuya Evan KISHIMOTO Shoko YASHIMA Rei NAKAHIRA Eri ONOZAWA Daigo AZAKAMI Makoto UJIKE Kazuhiko OCHIAI Toshiyuki ISHIWATA Kimimasa TAKAHASHI Masaki MICHISHITA
出版者: 公益社団法人日本獣医学会
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: pp.16-0412, (Released:2017-05-21)
被引用文献数: 7

Cancer stem cells or tumor-initiating cells (TICs) are a small subpopulation of cells that have the capacity to self-renew, differentiate and initiate tumors. These cells may function in tumor initiation, aggression and recurrence. Whether spheres derived from canine rhabdomyosarcoma cells have stem cell-like properties is unclear. We induced sphere formation in the canine rhabdomyosarcoma cell lines, CMS-C and CMS-J, and characterized the spheres in vitro and in vivo. Sphere-forming cells were more resistant to vincristine, mitoxantrone and doxorubicin than adherent cells. Xenograft transplantation demonstrated that 1 × 103 sphere-forming cells derived from CMS-C were sufficient for tumor formation. The sphere assay showed that the sphere-forming cells were present in these tumors. These results suggest that the spheres derived from canine rhabdomyosarcoma cells may possess characteristics of TICs. This study provides the foundation for elucidating the contribution of TICs to rhabdomyosarcoma tumorigenesis.

2017-05-22 23:58:47
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2 0 0 0 OA Primary T-cell high-grade lymphoma of the feline uterus

著者: Daigo AZAKAMI Eri ONOZAWA Masahiro MIYABE Kazuhiko OCHIAI Masaki MICHISHITA Taichi HIRANO Yutaka MOMOTA Katsumi ISHIOKA Toshinori SAKO
出版者: 公益社団法人日本獣医学会
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: pp.15-0575, (Released:2016-02-09)
被引用文献数: 2

A 12-year-old female American shorthair cat presented with a one-month history of hematuria and general lethargy. Abdominal ultrasonography revealed complete thickening of the left uterine wall. At a diagnostic laparotomy, a large mass arising from the left uterine horn was discovered, and ovariohysterectomy was performed. Histological diagnosis revealed a T-cell high-grade lymphoma of the uterus. After the ovariohysterectomy, the patient achieved complete remission and maintained by combination chemotherapy from 14 days after surgery. However, relapse occurred in the urinary bladder wall on day 287, and the patient died of postrenal acute renal failure on day 310. This is the first report of a feline case of primary uterine lymphoma that was treated with ovariohysterectomy followed by systemic chemotherapy.

2016-02-09 22:06:35
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2 0 0 0 OA Antitumor Effect of Bevacizumab in a Xenograft Model of Canine Hemangiopericytoma

著者: Masaki Michishita Tatsuya Uto Ryota Nakazawa Hisashi Yoshimura Kikumi Ogihara Yuko Naya Tsuyoshi Tajima Daigo Azakami Seigo Kishikawa Toshiro Arai Kimimasa Takahashi
出版者: The Japanese Pharmacological Society
雑誌: Journal of Pharmacological Sciences (ISSN:13478613)
巻号頁・発行日: vol.121, no.4, pp.339-342, 2013-04-20 (Released:2013-04-19)
参考文献数: 15
被引用文献数: 8 15

Canine hemangiopericytoma (CHP) is characterized by frequent local recurrence and increased invasiveness. Vascular endothelial growth factor (VEGF) is a key regulator of angiogenesis in tumors. The aim of the present study was to investigate the effect of a single dose of bevacizumab on a xenograft model of CHP. VEGF protein was secreted from cultured CHP cells and interacted with bevacizumab. Bevacizumab treatment suppressed tumor growth by inhibiting tumor angiogenesis, whereas no significant differences were observed in the proliferation index and apoptosis rates of treated and untreated mice. Thus, bevacizumab had antitumor effects in a xenograft model of CHP.

2013-05-12 23:17:04
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1 0 0 0 OA Hepatic neuroendocrine carcinoma with metastases to the lymph nodes in a sika deer (Cervus nippon yakushimae)

著者: Ritsu SHIBATA Yukino MACHIDA Hitoshi HATAKEYAMA Hisashi YOSHIMURA Masami YAMAMOTO Kazuhiko OCHIAI Kazuyoshi UEMATSU Masaki MICHISHITA
出版者: JAPANESE SOCIETY OF VETERINARY SCIENCE
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: pp.19-0472, (Released:2020-01-01)

A 26-year and 6-month-old male sika deer that was kept at the Showa Park, Tokyo, Japan, collapsed and died of severe disease wasting and severe tabefaction. Grossly, numerous masses, 0.3–1.0 cm diameter, were dispersed throughout the liver. The multiple masses were composed of tumor cells, which had hypochromatic nuclei and abundant faintly eosinophilic cytoplasm, arranged in nests of various sizes. Immunohistochemically, tumor cells were positive for cytokeratin, chromogranin A, synaptophysin and gastrin. Ultrastructurally, the cytoplasm of the tumor cells contained abundant membrane-bound electron-dense granules. A metastatic lesion was observed in the renal, hepatic and pancreatic lymph nodes. On the basis of these findings, this tumor was diagnosed as neuroendocrine carcinoma with metastases to the lymph nodes.

2021-07-25 23:02:55
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1 0 0 0 OA Long-term management and postmortem examination in a diabetic cat with acromegaly treated with two courses of radiation therapy

著者: Harumi SAWADA Akihiro MORI Masaki MICHISHITA Hitomi ODA Toshinori SAKO
出版者: JAPANESE SOCIETY OF VETERINARY SCIENCE
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: pp.17-0289, (Released:2018-11-16)
被引用文献数: 3

2018-11-20 00:42:00
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1 0 0 0 OA A cat with suspected laryngeal metastasis with mucosal irregularity resulting from apocrine/salivary gland adenocarcinoma in the head

著者: Aki FUJIWARA-IGARASHI Koichi SHIMIZU Masaki MICHISHITA Yoshihiko YU Yuji HAMAMOTO Daisuke HASEGAWA Michio FUJITA
出版者: JAPANESE SOCIETY OF VETERINARY SCIENCE
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: vol.79, no.12, pp.1916-1919, 2017 (Released:2017-12-06)
参考文献数: 14
被引用文献数: 2

A 16-year-old castrated male mongrel cat presented with swelling under the left pinna and a 3 -month history of voice change. Laryngeal endoscopy revealed circumferential oedema around the arytenoid cartilages and hypersecretion of saliva. Histopathological examination of the mass around the left ear canal was considered the primary lesion that originated from cutaneous apocrine adenocarcinoma or parotid gland adenocarcinoma, and it metastasized to the larynx, lung and medial retropharyngeal lymph nodes. This report provides new insights into feline laryngeal diseases which could result in laryngeal metastasis with slight mucosal irregularity alone and without obvious radiographic abnormalities. Therefore, histopathological examination should be performed when a cat presents clinical signs such as stridor, dysphonia or voice change without any mass-forming laryngeal lesion.

2018-09-18 23:24:57
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1 0 0 0 OA Functional alteration of canine isocitrate dehydrogenase 2 (IDH2) via an R174K mutation

著者: Shota KAWAKAMI Kazuhiko OCHIAI Yuiko KATO Masaki MICHISHITA Hinako HIRAMA Ryo OBARA Daigo AZAKAMI Masami WATANABE Toshinori OMI
出版者: JAPANESE SOCIETY OF VETERINARY SCIENCE
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: vol.80, no.1, pp.85-91, 2018 (Released:2018-01-27)
参考文献数: 23

Gliomas are common intracranial neoplasias in dogs. However, the underlying pathogenic mechanisms remain unclear. In humans, isocitrate dehydrogenase 2 (IDH2) is often mutated in gliomas. Although almost human IDH2 mutations have been identified at the Arg172 codon, few studies have reported structural, functional or mutational information for canine IDH2. In this study, we cloned the full-length canine IDH2 (cIDH2) cDNA and substituted wild type Arg174 (cIDH2 WT: corresponding to R172 of human IDH2) with Lys (cIDH2 R174K). The cIDH2 WT and R174K proteins were overexpressed in HeLa cells, and their presence was confirmed using an anti-human IDH2-WT mAb (clone: KrMab-3) and an anti-IDH2-R172K mAb (clone: KMab-1). The IDH2 activity between cIDH2 WT and cIDH2 R174K transfectants was compared by measuring the production of NADH and NADPH. NADPH production was lower for cIDH2 R174K than that for cIDH2 WT transfectants. Finally, we detected increased expression of hypoxia inducible factor-1 alpha (HIF-1α) in cIDH2 R174K transfectants. This indicates that mutations at R174 can potentially induce carcinogenesis in canine somatic cells.

2018-01-27 19:26:31
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1 0 0 0 OA A cat with suspected laryngeal metastasis with mucosal irregularity resulting from apocrine/salivary gland adenocarcinoma in the head

著者: Aki FUJIWARA-IGARASHI Koichi SHIMIZU Masaki MICHISHITA Yoshihiko YU Yuji HAMAMOTO Daisuke HASEGAWA Michio FUJITA
出版者: 公益社団法人日本獣医学会
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: pp.17-0242, (Released:2017-10-11)
被引用文献数: 2

A 16-year-old castrated male mongrel cat presented with swelling under the left pinna and a 3 -month history of voice change. Laryngeal endoscopy revealed circumferential oedema around the arytenoid cartilages and hypersecretion of saliva. Histopathological examination of the mass around the left ear canal was considered the primary lesion that originated from cutaneous apocrine adenocarcinoma or parotid gland adenocarcinoma, and it metastasized to the larynx, lung and medial retropharyngeal lymph nodes. This report provides new insights into feline laryngeal diseases which could result in laryngeal metastasis with slight mucosal irregularity alone and without obvious radiographic abnormalities. Therefore, histopathological examination should be performed when a cat presents clinical signs such as stridor, dysphonia, or voice change without any mass-forming laryngeal lesion.

2017-10-12 00:49:07
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1 0 0 0 OA Disseminated histiocytic sarcoma with hemophagocytosis in a rabbit

著者: Mio ISHIMORI Masaki MICHISHITA Hisashi YOSHIMURA Daigo AZAKAMI Kazuhiko OCHIAI Toshiyuki ISHIWATA Kimimasa TAKAHASHI
出版者: 公益社団法人日本獣医学会
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: pp.17-0297, (Released:2017-07-21)
被引用文献数: 11

A 7-year-old female domestic rabbit suffered from labored respiration, poor appetite, mild anemia and thrombocytopenia. Radioscopic examination revealed masses in multiple locations including the intrapleural cavity and spleen. Forty-three days after the first visit to a private veterinary clinic, the rabbit died of severe respiratory distress. Microscopically, all of the masses were composed of round to polygonal neoplastic cells with distinct cell borders that were arranged in a sheet pattern. Multinucleated giant neoplastic cells were often observed. Some neoplastic cells had phagocytozed one or more erythrocytes. Immunohistochemical staining revealed that the neoplastic cells expressed vimentin, CD204, Iba-1 and lysozyme, but not CD163. Based on the morphological and immunohistochemical findings, this case was diagnosed as disseminated histiocytic sarcoma with hemophagocytosis.

2017-07-30 08:51:46
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1 0 0 0 OA Identification of tumor-initiating cells derived from two canine rhabdomyosarcoma cell lines

著者: Takuya Evan KISHIMOTO Shoko YASHIMA Rei NAKAHIRA Eri ONOZAWA Daigo AZAKAMI Makoto UJIKE Kazuhiko OCHIAI Toshiyuki ISHIWATA Kimimasa TAKAHASHI Masaki MICHISHITA
出版者: 公益社団法人日本獣医学会
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: vol.79, no.7, pp.1155-1162, 2017 (Released:2017-07-07)
参考文献数: 29
被引用文献数: 7

2017-07-07 23:03:33
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1 0 0 0 OA Vaginal clear cell carcinoma in a Japanese Black cow

著者: Masaki MICHISHITA Makito HORI Rei NAKAHIRA Kimimasa TAKAHASHI
出版者: 公益社団法人日本獣医学会
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: vol.78, no.5, pp.901-903, 2016 (Released:2016-06-01)
参考文献数: 14

During artificial insemination of an 18-year-old female Japanese Black cow, a mass that was of a hen’s egg size was found in the vagina. On necropsy, the firm mass, measuring approximately 3.5 × 3.5 × 3.0 cm, was located at the superior region of the vagina. The cut surface of the mass was gray-white in color with occasional necrotic or hemorrhagic areas. Histologically, the mass was composed of tumor cells arranged in solid nests of various sizes with an occasional tubular structure separated by a delicate fibrovascular stroma. The tumor cells had a hypochromatic nucleus and abundant, faintly eosinophilic cytoplasm. The tumor cells contained diastase-sensitive periodic acid-Schiff positive granules. Immunohistochemically, tumor cells were positive for cytokeratin AE1/AE3, CAM5.2 and carcinoembryonic antigen, but not for vimentin, p63, estrogen receptor-α, progesterone receptor, α-smooth muscle actin, neuron-specific enolase, S-100 protein and chromogranin A. On the basis of these findings, the tumor was diagnosed as a clear cell carcinoma of the vagina.

2017-06-29 22:39:51
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1 0 0 0 OA Anti-tumor effect of bevacizumab on a xenograft model of feline mammary carcinoma

著者: Masaki MICHISHITA Aya OHTSUKA Rei NAKAHIRA Tsuyoshi TAJIMA Takayuki NAKAGAWA Nobuo SASAKI Toshiro ARAI Kimimasa TAKAHASHI
出版者: 公益社団法人日本獣医学会
雑誌: Journal of Veterinary Medical Science (ISSN:09167250)
巻号頁・発行日: pp.15-0550, (Released:2015-11-28)
被引用文献数: 1 22

Feline mammary carcinomas are characterized by rapid progression and metastases. Vascular endothelial growth factor (VEGF) is a key regulator of tumor angiogenesis, proliferation and metastasis. The present study aimed to investigate the effects of a single drug therapy of bevacizumab on a xenograft model of feline mammary carcinoma expressing VEGF protein. Bevacizumab treatment suppressed tumor growth by inhibiting angiogenesis and enhancing apoptosis; however, it did not affect the tumor proliferation index. Thus, bevacizumab had anti-tumor effects on a xenograft model, and this may be useful for the treatment of feline mammary carcinoma.

2015-12-02 23:06:13
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