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52.
Masataka CHIHARA Saori OTSUKA Osamu ICHII Yasuhiro KON 《The Journal of reproduction and development》2013,59(6):525-535
The blood testis-barrier (BTB) is essential for maintaining homeostasis in the
seminiferous epithelium. Although many studies have reported that vitamin A (VA) is
required for the maintenance of spermatogenesis, the relationships between the BTB,
spermatogenesis and VA have not been elucidated. In this study, we analyzed BTB
assembly and spermatogenesis in the testes of mice fed the VA-deficient (VAD) diet
from the prepubertal period to adulthood. During the prepubertal period, no changes
were observed in the initiation and progression of the first spermatogenic wave in
mice fed the VAD diet. However, the numbers of preleptotene/leptotene spermatocytes
derived from the second spermatogenic wave onwards were decreased, and initial BTB
formation was also delayed, as evidenced by the decreased expression of mRNAs
encoding BTB components and VA signaling molecules. From 60 days postpartum, mice fed
the VAD diet exhibited apoptosis of germ cells, arrest of meiosis, disruption of the
BTB, and dramatically decreased testis size. Furthermore, vacuolization and
calcification were observed in the seminiferous epithelium of adult mice fed the VAD
diet. Re-initiation of spermatogenesis by VA replenishment in adult mice fed the VAD
diet rescued BTB assembly after when the second spermatogenic wave initiated from the
arrested spermatogonia reached the preleptotene/leptotene spermatocytes. These
results suggested that BTB integrity was regulated by VA metabolism with meiotic
progression and that the impermeable BTB was required for persistent spermatogenesis
rather than meiotic initiation. In conclusion, consumption of the VAD diet led to
critical defects in spermatogenesis progression and altered the dynamics of BTB
assembly. 相似文献
53.
Delgado M. VALDEZ JR . Ryoma TSUCHIYA Shinsuke SEKI Naoya SAIDA Saori NIIMI Chihiro KOSHIMOTO Kazutsugu MATSUKAWA Magosaburo KASAI Keisuke EDASHIGE 《The Journal of reproduction and development》2013,59(2):205-213
Fish oocytes have not been cryopreserved successfully, probably because it is difficult
to prevent intracellular ice from forming. Previously, we have shown in medaka that
immature oocytes are more suitable for cryopreservation than mature oocytes or embryos, in
terms of permeability. We have also shown in immature medaka oocytes that the exogenous
expression of aquaporin 3 (AQP3), a water/cryoprotectant channel, promotes the movement of
water and cryoprotectants through the plasma membrane. In the present study, we attempted
to cryopreserve immature medaka oocytes expressing AQP3. We first examined effects of
hypertonic stress and the chemical toxicity of cryoprotectants on the survival of the
AQP3-expressing oocytes. Exposure to hypertonic solutions containing sucrose decreased the
survival of oocytes, but the expression of AQP3 did not affect sensitivity to hypertonic
stress. Also, AQP3 expression did not markedly increase sensitivity to the toxicity of
cryoprotectants. Of the four cryoprotectants tested, propylene glycol was the least toxic.
Using a propylene glycol-based solution, therefore, we tried to cryopreserve immature
oocytes by vitrification. During cooling with liquid nitrogen, all intact oocytes became
opaque, but many AQP3-expressing oocytes remained transparent. This indicates that the
expression of AQP3 is effective in preventing intracellular ice from forming during
cooling. During warming, however, all the AQP3-expressing oocytes became opaque,
indicating that intracellular ice formed. Therefore, the dehydration and permeation by
propylene glycol were still insufficient. Further studies are necessary to realize the
cryopreservation of fish oocytes. 相似文献
54.
K Yasuno H Sakashita S Araki R Kobayashi Y Sakurada M Shirota J Kamiie K Shirota 《Journal of toxicologic pathology》2012,25(2):175-178
This report describes a spontaneous hybrid cyst in a Sprague-Dawley (SD) rat. A 52-week-old, male SD rat had a cutaneous cyst on the left mystacial pad. Histologically, the cyst wall showed infundibular differentiation with keratohyalin granules in the granular layer and matrical differentiation comprising basaloid epithelial cells with trichohyalin granules. The cyst cavity was filled with lamellar, flaky keratin and aggregates of shadow cells. Immunohistochemically, the infundibular-type epithelium was positive for cytokeratin (CK) AE1/AE3, CK KL1 and CK14 but negative for CK15, whereas the matrical-type epithelium was negative for all four CK isoforms examined. These immunohistochemical properties of the infundibular- and matrical-type epithelia were similar to those of the infundibulum and inferior segment of normal hair follicles, respectively. Based on these findings, the cyst was diagnosed as a hybrid cyst, comprising more than one type of cyst arising from various parts of the pilosebaceous unit. 相似文献
55.
T Okagawa S Konnai H Mekata N Githaka S Suzuki E Kariuki F Gakuya E Kanduma T Shirai R Ikebuchi Y Ikenaka M Ishizuka S Murata K Ohashi 《Veterinary immunology and immunopathology》2012,148(3-4):373-379
Theileria parva (T. parva) causes East Coast fever (ECF), which is of huge economic importance to Eastern and Southern African countries. In a previous bovine model, inflammatory cytokines were closely associated with disease progression in animals experimentally infected with T. parva. The African Cape buffalo (Syncerus caffer), the natural reservoir for T. parva, is completely resistant to ECF despite a persistently high parasitaemia following infection with T. parva. Characterizing basic immunological interactions in the host is critical to understanding the mechanism underlying disease resistance in the African Cape buffalo. In this study, the expression level of several cytokines was analyzed in T. parva-infected buffaloes. There were no significant differences in the expression profiles of inflammatory cytokines between the infected and uninfected animals despite a remarkably high parasitaemia in the former. However, the expression level of IL-10 was significantly upregulated in the infected animals. These results indicate a correlation between diminished inflammatory cytokines response and disease resistance in the buffalo. 相似文献
56.
Hankanga C Kobayashi S Yamada Y Momota Y Tomizawa N Sato R Yasuda J 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2007,69(9):881-885
Adenosine deaminase (ADA), an enzyme involved in purine metabolism, has been shown to be of clinical importance in several diseases in humans. To investigate whether ADA is of any clinical significance in cats, plasma adenosine deaminase (P-ADA) and T cell adenosine deaminase (T-ADA) activities were measured in feline immunodeficiency virus (FIV) negative and positive cats. The AIDS-related complex (ARC) group showed a significant elevation in P-ADA activity compared to the asymptomatic carrier (AC), and FIV-negative groups (P<0.005). T-ADA activity was significantly elevated in FIV-positive cats compared to the FIV-negative group (P<0.05) and this elevation was attributed to the increase in the ARC group (P<0.01). A correlation was found between P-ADA and T-ADA activities in the FIV-negative group. T-ADA activity and CD4(+)cell number showed a strong negative correlation in FIV-positive cats (P<0.0005). CD4(+) cell numbers were significantly reduced in the ARC group compared to the healthy controls (P<0.005). Our results showed that T-ADA is increased in FIV-positive cats during the ARC stage. These results also suggest that ADA may be an indicator of T cell activation in the ARC stage of FIV infection. 相似文献
57.
Tsuyoshi Shimmura Yuji Maruyama Saori Fujino Eriko Kamimura Katsuji Uetake Toshio Tanaka 《Animal Science Journal》2015,86(2):214-220
We reported previously that behavioral development of chicks was promoted remarkably by the presence of a broody hen. Here we report that these effects at an early age persist after maturity. A total of 60 female chicks were randomly assigned to one of two treatment groups: six pens with five chicks (brooded group) each were reared by a broody hen and six pens with five chicks (non‐brooded group) each were provided with an infrared heating lamp. We evaluated the persistent effects of broody hens by measures of behavior, physical condition and production at 9, 16, 35 and 55 weeks of age. The numbers of threatening, aggressive pecking, fighting and severe feather pecking behaviors were higher in non‐brooded than in brooded chickens (all P < 0.05). Egg production was lower in brooded than in non‐brooded chickens (P < 0.05), while the number of brooding chickens was higher in the brooded than in the non‐brooded group (P < 0.05). In conclusion, the presence of broody hens at an early stage of chicks' lives has a persistent effect on behavior. Although brooded chickens showed more brooding and lower egg production than non‐brooded chickens, feather pecking and aggressive interaction were decreased in brooded hens. 相似文献
58.
Hiroto MAEDA Kazuyuki SOGAWA Kazuko SAKAGUCHI Saori ABE Wataru SAGIZAKA Shunsuke MOCHIZUKI Waka HORIE Toshifumi WATANABE Yui SHIBATA Mamoru SATOH Akihiro SANDA Fumio NOMURA Jun SUZUKI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(8):937-943
Feline renal diseases are increasingly noted in veterinary practice. It is important to diagnose and identify the pathological basis of renal dysfunction accurately at an early stage, but there are only a few reports on this area in clinical veterinary medicine. We investigated the efficacy of measurement of urinary albumin (u-Alb) and urinary transferrin (u-Tf) for early diagnosis using 5-µl urine samples collected noninvasively by catheterization from normal (IRIS stage I) cats and cats with stage I chronic kidney disease (CKD). The u-Alb levels in normal and stage I CKD cats were 6.0 ± 4.5 and 11.2 ± 8.4 mg/dl, respectively, and the u-Tf levels were 0.09 ± 0.42 and 0.52 ± 0.79 mg/dl, respectively. Based on ROC curve analysis, the sensitivity and specificity of u-Alb and u-Tf were higher than those of the currently used biomarker, the plasma creatinine level. The sensitivity of u-Alb was higher than that of u-Tf, whereas
the specificity of u-Tf was higher than that of u-Alb. The validity of the threshold albumin level (20 mg/dl) was confirmed by measurements using SDS-PAGE. Since leakage of u-Tf in urine precedes leakage of u-Alb, inclusion of u-Tf in biochemistry tests may be appropriate for IRIS staging as a diagnostic marker of early diagnosis of renal disorder in cats. 相似文献
59.
Satoru Takanashi Tomonori Nochi Miku Abe Nanami Itaya Megumi Urakawa Katsuyoshi Sato Tao Zhuang Saori Umemura Tomohito Hayashi Yoshio Kiku Haruki Kitazawa Michael T. Rose Kouichi Watanabe Hisashi Aso 《Veterinary research》2015,46(1)
Cyclophilin A (CyPA) was originally discovered in bovine thymocytes as a cytosolic binding protein of the immunosuppressive drug cyclosporine A. Recent studies have revealed that in mice and humans, CyPA is secreted from cells in injured or infected tissues and plays a role in recruiting inflammatory cells in those tissues. Here we found that in cattle abundant level of extracellular CyPA was observed in tissues with inflammation. To aid in investigating the role of extracellular CyPA in cattle, we generated recombinant bovine CyPA (rbCyPA) and tested its biological activity as an inflammatory mediator. When bovine peripheral blood cells were treated with rbCyPA in vitro, we observed that rbCyPA reacts with the membranous surface of granulocytes, monocytes and lymphocytes. Chemotaxis analysis showed that the granulocytes migrate toward rbCyPA and the migration is inhibited by pre-treatment with an anti-bovine CyPA antibody. These results indicate that, as for mice and humans, extracellular CyPA possesses chemotactic activity to recruit inflammatory cells (e.g., granulocytes) in cattle, and could thus be a potential therapeutic target for the treatment of inflammation. 相似文献
60.
Osamu Hashiguchi Yuko Yamaguchi Shinichiro Ikezaki Tsubasa Saito Saori Igura Ryo Hirai Naomi Horiuchi Kazutoshi Tamura 《Journal of toxicologic pathology》2022,35(1):107
A female TOYO beagle dog showed porencephaly and visual organ abnormalities. At necropsy, there was a cavity filled with cerebrospinal fluid in the right cerebral hemisphere and an adhesion area between the cerebral cortex and the skull, which was partially thickened. Additionally, the right optic nerve showed a slight decrease in diameter. Histopathological examination revealed increased glial fibers and collagen fibers, hemosiderin deposition, and an increased number of microglia in the adhesion area, along with a marked reduction of the cerebral parenchyma. In the right eyeball, the retina and optic nerve showed focal atrophy in the nerve fiber layer and inner granular layer to full retinal atrophy and hypoplasia of the myelinated nerve fibers, respectively. Electron microscopic examination revealed hypoplasia of the myelin sheath of nerve fibers in the right optic nerve. This is an extremely rare case of porencephaly and congenital optic nerve hypoplasia, along with independent retinal thinning. 相似文献