Autoimmune disease and impaired uptake of apoptotic cells in MFG-E8-deficient mice   总被引：2，自引：0，他引：2  

Hanayama R  Tanaka M  Miyasaka K  Aozasa K  Koike M  Uchiyama Y  Nagata S 《Science (New York, N.Y.)》2004,304(5674):1147-1150

Apoptotic cells expose phosphatidylserine and are swiftly engulfed by macrophages. Milk fat globule epidermal growth factor (EGF) factor 8 (MFG-E8) is a protein that binds to apoptotic cells by recognizing phosphatidylserine and that enhances the engulfment of apoptotic cells by macrophages. We report that tingible body macrophages in the germinal centers of the spleen and lymph nodes strongly express MFG-E8. Many apoptotic lymphocytes were found on the MFG-E8-/- tingible body macrophages, but they were not efficiently engulfed. The MFG-E8-/- mice developed splenomegaly, with the formation of numerous germinal centers, and suffered from glomerulonephritis as a result of autoantibody production. These data demonstrate that MFG-E8 has a critical role in removing apoptotic B cells in the germinal centers and that its failure can lead to autoimmune diseases.  相似文献   

Furazolidone induces the activity of microsomal enzymes that metabolize furazolidone in chickens     

Nobuo SasakiTomoyuki Matsumoto  Yoshinori IkenakaAkio Kazusaka  Mayumi Ishizuka  Shoichi Fujita 《Pesticide biochemistry and physiology》2011,100(2):135-139

The nitrofuran antibacterial agent furazolidone (FZ) is still used in veterinary medicine in some countries in the Middle and Far East. The present study aimed to show the effect of FZ on the activity of microsomal enzymes that metabolize FZ, and to identify the enzyme that contributes to FZ metabolism in chickens. Wistar rats and White Leghorn chickens were administered FZ once a day for four consecutive days. FZ metabolism was accelerated by FZ administration in chickens, but not in rats. The elevation of FZ metabolism coincided with the induction of NADPH cytochrome P450 reductase (CPR) activity in chickens, but such induction was not observed in rats. FZ metabolizing activities were inhibited in the presence of a CPR inhibitor (diphenylene iodonium chloride) but not by the addition of archetypal cytochrome P450 inhibitors (CO or n-octylamine). The preset study concluded that FZ accelerated its own metabolism in the chicken by induction of the activity of CPR.  相似文献   

Serum haptoglobin levels in canine dirofilariasis     

H Kitagawa  Y Sasaki  A Matsui  K Ishihara  T Uchiyama 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1987,49(2):261-266

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The effect of pretreatment with different doses of GnRH to synchronize follicular wave on superstimulation of follicular growth in dairy cattle   总被引：1，自引：0，他引：1  

Sato T  Nakada K  Uchiyama Y  Kimura Y  Fujiwara N  Sato Y  Umeda M  Furukawa T 《The Journal of reproduction and development》2005,51(5):573-578

The objective of this study was to evaluate the efficiency of gonadotropin releasing hormone (GnRH) and GnRH doses in synchronizing follicular wave emergence as a pretreatment for superovulation in cattle. Fourteen Holstein-Friesian cows 6 days from estrus were randomly assigned to receive 100 microg (n=4), 50 microg (n=5), or 25 microg (n=5) of GnRH. Superovulation was induced with injections of porcine FSH (pFSH) twice daily, decreasing the dose (total 42 AU) over 5 days beginning 2.5 days after receiving GnRH. On the 7th and 8th injections of pFSH, 750 microg of PGF(2alpha) was also given. With the exception of one cow that was given 50 microg of GnRH, ovulation was induced in all cows from the three groups and the new follicular wave emergence was observed. The total number of follicles for the 25 microg GnRH group was less than that observed for the 100 microg GnRH group (P<0.05), although there were no differences between the 100 microg, 50 microg and 25 microg GnRH groups with respect to the number of preovulatory follicles (>or=10 mm) and CL. The numbers of normal embryos were greater for the 25 microg GnRH group than the 100 or 50 microg GnRH groups (P<0.01); however, the numbers of ova/embryos did not differ significantly between the three groups. These results suggest that 25 microg of GnRH was sufficient to induce ovulation and follicular wave emergence. On day 6 of the estrous cycle, a reduction of the dose of GnRH to synchronize follicular wave emergence as a pretreatment for superstimulation promotes transferable embryos.  相似文献   

Establishment and characterization of eight feline mammary adenocarcinoma cell lines     

Uyama R  Hong SH  Nakagawa T  Yazawa M  Kadosawa T  Mochizuki M  Tsujimoto H  Nishimura R  Sasaki N 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2005,67(12):1273-1276

Eight new feline mammary adenocarcinoma cell lines derived from either primary or metastatic lesions were established. The morphology of all the cell lines was epithelioid and round to spindle in shape, with cell growth occurring in a monolayer fashion. On immunohistochemistry, these cells reacted with anti-keratin and anti-vimentin antisera. The doubling time of these cells was between 19 and 54 hr. Tumor masses were developed in nude mice by subcutaneous inoculation of the cells that were histologically identical to their original mammary tumor lesions. Telomerase activities measured using the telomeric repeat amplification protocol assay revealed high telemetric activity in all of the cells.  相似文献   

Immunohistochemical localization of steroidogenic enzymes in corpus luteum of wild sika deer during early mating season     

Matsuura Y  Suzuki M  Hayakawa D  Asano M  Sasaki M  Kitamura N  Yamada J  Tsubota T  Ohtaishi N 《The Japanese journal of veterinary research》2004,51(3-4):167-172

We analyzed the localization of steroidogenic enzymes (P450 scc, 3 beta HSD, P450 arom and P450 c17) in the corpora lutea of two Hokkaido sika deer (Cervus nippon yesoensis) during the early mating season. Two corpora lutea were found in each female and the timing of formation of the corpora lutea seemed different. P450 scc, and 3 beta HSD, positive luteal cells were found in both corpora lutea. The existence of two functional corpora lutea from the early mating season through pregnancy suggests that progesterone secreted by two or more corpora lutea is necessary for maintenance of pregnancy in sika deer.  相似文献   

Histological variations in myoepithelial cells and arrectores pilorum muscles among caudal, metatarsal and preorbital glands in Hokkaido sika deer (Cervus nippon yesoensis Heude, 1884)     

Ozaki N  Suzuki M  Ohtaishi N 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(3):283-285

The morphological characteristics of myoepithelial cells and arrectores pilorum muscles were investigated in caudal, metatarsal and preorbital glands of Hokkaido sika deer (Cervus nippon yesoensis Heude, 1884) using immunohistochemistry for alpha-smooth muscle actin. In the metatarsal, preorbital and general skin glands, myoepithelial cell layers continuously embraced the secretory epithelium, while in the caudal gland, discontinuous myoepithelial cell rows surrounded the apocrine tubules. There was a trend that the widths of the myoepithelial cells of the caudal and preorbital glands appeared to be thinner than those of the metatarsal and general skin glands. In the metatarsal gland, the arrectores pilorum muscles were highly developed and considerably larger than those in other skin glands.  相似文献   

Establishment and characterization of four canine melanoma cell lines     

Inoue K  Ohashi E  Kadosawa T  Hong SH  Matsunaga S  Mochizuki M  Nishimura R  Sasaki N 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(11):1437-1440

Four canine melanoma cell lines were established from the subcutaneous, oral gingival and mucosal melanoma tissues at the primary and metastatic sites. These cell lines were designated as CMeC-1, CMeC-2, KMeC and LMeC. The cells were spindles in shape, similar to that of primary tumor cells. The doubling times of these cells ranged from 34.1 +/- 5.61 to 57.9 +/- 3.28 hr and their chromosome number ranged from 46 to 80. When transplanted into nude mice, CMeC-1 and LMeC produced tumors, whereas CMeC-2 and KMeC did not. The morphology of the tissue formed by xenotransplantation of these cells was similar to their primary tumors.  相似文献   

Immunohistochemical localization of steroidogenic enzymes in the testis of Hokkaido Sika deer (Cervus nippon yesoensis)     

Hayakawa D  Sasaki M  Akabane C  Kitamura N  Tsubota T  Suzuki M  Yamada J 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(11):1463-1466

The testes from 15 adult male Hokkaido Sika deer (Cervus nippon yesoensis) were collected during the rutting season (October and November). We investigated the localization of 4 kinds of steroidogenic enzymes (P450scc, 3betaHSD, P450c17 and P450arom) immunohistochemically in these testicular samples. The specific immunoreactivities to these enzymes were detected only in the cytoplasm of Leydig cells. This differs to the enzyme distributions reported previously in Japanese black bear, Japanese raccoon dog, Hokkaido brown bear and American black bear, in which the same immunoreactivities were detected in Leydig cells, Sertoli cells and/or spermatogenic cells. The current study suggests that in the testes of the Hokkaido Sika deer, testosterone and estradiol-17beta may be synthesized in the Leydig cells only.  相似文献   

Drilling to gabbro in intact ocean crust     

Wilson DS  Teagle DA  Alt JC  Banerjee NR  Umino S  Miyashita S  Acton GD  Anma R  Barr SR  Belghoul A  Carlut J  Christie DM  Coggon RM  Cooper KM  Cordier C  Crispini L  Durand SR  Einaudi F  Galli L  Gao Y  Geldmacher J  Gilbert LA  Hayman NW  Herrero-Bervera E  Hirano N  Holter S  Ingle S  Jiang S  Kalberkamp U  Kerneklian M  Koepke J  Laverne C  Vasquez HL  Maclennan J  Morgan S  Neo N  Nichols HJ  Park SH  Reichow MK  Sakuyama T  Sano T  Sandwell R  Scheibner B  Smith-Duque CE  Swift SA  Tartarotti P  Tikku AA  Tominaga M  Veloso EA 《Science (New York, N.Y.)》2006,312(5776):1016-1020

Sampling an intact sequence of oceanic crust through lavas, dikes, and gabbros is necessary to advance the understanding of the formation and evolution of crust formed at mid-ocean ridges, but it has been an elusive goal of scientific ocean drilling for decades. Recent drilling in the eastern Pacific Ocean in Hole 1256D reached gabbro within seismic layer 2, 1157 meters into crust formed at a superfast spreading rate. The gabbros are the crystallized melt lenses that formed beneath a mid-ocean ridge. The depth at which gabbro was reached confirms predictions extrapolated from seismic experiments at modern mid-ocean ridges: Melt lenses occur at shallower depths at faster spreading rates. The gabbros intrude metamorphosed sheeted dikes and have compositions similar to the overlying lavas, precluding formation of the cumulate lower oceanic crust from melt lenses so far penetrated by Hole 1256D.  相似文献