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71.
Adult newt retinal pigment epithelium (RPE) cells are mitotically quiescent in the physiological condition, but upon a traumatic injury of the neural retina (NR) they re-enter the cell-cycle and eventually regenerate the missing NR. Here, to understand the mechanism underlying the cell-cycle re-entry of RPE cells following NR injury, we first investigated changes in MEK–ERK signaling activity in RPE cells upon removal of the NR (retinectomy) from the eye of living animals, and found that ERK-mediated signaling activity is elevated quickly (in 30 min) upon retinectomy. In addition, we found, in in vitro analyses, that immediate early activation of MEK–ERK signaling may occur in RPE cells upon NR injury, intensifying the MEK–ERK signaling itself through up-regulation of the expression of constituent molecules in the pathway, and that 1-h blockade of such early MEK–ERK signaling interferes with the cell-cycle re-entry, which occurs 5–10 days later. Together, these results provide us with insight that elevation of MEK–ERK signaling activity upon NR injury may be a key process for mitotically quiescent RPE cells to re-enter the cell-cycle, leading to retinal regeneration. 相似文献
72.
Kojima S Kawana K Fujii T Yokoyama T Miura S Tomio K Tomio A Yamashita A Adachi K Sato H Nagamatsu T Schust DJ Kozuma S Taketani Y 《American journal of reproductive immunology (New York, N.Y. : 1989)》2011,66(5):435-443
Citation Kojima S, Kawana K, Fujii T, Yokoyama T, Miura S, Tomio K, Tomio A, Yamashita A, Adachi K, Sato H, Nagamatsu T, Schust DJ, Kozuma S, Taketani Y. Characterization of gut‐derived intraepithelial lymphocyte (IEL) residing in human papillomavirus (HPV)‐infected intraepithelial neoplastic lesions.Am J Reprod Immunol 2011; 66: 435–443 Problem Mucosal T cells are the most likely direct effectors in host anti‐human papillomavirus adaptive immunity and regression of cervical intraepithelial neoplasia (CIN) lesions. There are no studies addressing intraepithelial lymphocytes (IELs) in CIN lesions. Method of study Cervical lymphocytes were collected using cytobrushes from patients with CIN and analyzed by FACS analysis. Comparisons were made between populations of cervical T cells in CIN regressors and non‐regressors. Results A median of 74% of cervical lymphocytes were CD3+ T cells. Populations of integrin αEβ7+ IEL in CIN lesions varied markedly among patients (6–57%). Approximately half of integrin β7+ T cells were CD45RA‐negative memory T cells. The number of integrin αEβ7+ cells among cervical T cells was significantly higher in CIN regressors when compared to non‐regressors. Conclusion Higher cervical IEL numbers are associated with spontaneous regression of CIN. Accumulation of cervical integrin αEβ7+ IEL may be necessary for local adaptive effector functions. 相似文献
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Tomomi Yamaguchi Shujiro Hayashi Daisuke Hayashi Takeshi Matsuyama Norimichi Koitabashi Kenichi Ogiwara Masaaki Noda Chiai Nakada Shinya Fujiki Akira Furutachi Yasuhiko Tanabe Michiko Yamanaka Aki Ishikawa Miyako Mizukami Asako Mizuguchi Kazumitsu Sugiura Makoto Sumi Hirokuni Yamazawa Atsushi Izawa Yuko Wada Tomomi Fujikawa Yuri Takiguchi Keiko Wakui Kyoko Takano Shin-Ya Nishio Tomoki Kosho 《American journal of medical genetics. Part A》2023,191(1):37-51
Vascular Ehlers–Danlos syndrome (vEDS) is a hereditary connective tissue disorder (HCTD) characterized by arterial dissection/aneurysm/rupture, sigmoid colon rupture, or uterine rupture. Diagnosis is confirmed by detecting heterozygous variants in COL3A1. This is the largest Asian case series and the first to apply an amplification-based next-generation sequencing through custom panels of causative genes for HCTDs, including a specific method of evaluating copy number variations. Among 429 patients with suspected HCTDs analyzed, 101 were suspected to have vEDS, and 33 of them (32.4%) were found to have COL3A1 variants. Two patients with a clinical diagnosis of Loeys–Dietz syndrome and/or familial thoracic aortic aneurysm and dissection were also found to have COL3A1 variants. Twenty cases (57.1%) had missense variants leading to glycine (Gly) substitutions in the triple helical domain, one (2.9%) had a missense variant leading to non-Gly substitution in this domain, eight (22.9%) had splice site alterations, three (8.6%) had nonsense variants, two (5.7%) had in-frame deletions, and one (2.9%) had a multi-exon deletion, including two deceased patients analyzed with formalin-fixed and paraffin-embedded samples. This is a clinically useful system to detect a wide spectrum of variants from various types of samples. 相似文献
77.
Aki Tanaka Mitsuyoshi Hirokawa Ayana Suzuki Miyoko Higuchi Akira Miyauchi Takashi Akamizu 《Pathology international》2023,73(8):351-357
A preoperative diagnosis of metastatic renal cell carcinoma to the thyroid (MRCCT) is important for determining clinical management but is challenging even in cases with a clinical history of renal cell carcinoma (RCC). This study aimed to elucidate the clinical, cytological, and pathological characteristics of MRCCT. Fourteen MRCCT cases extracted from 18 320 malignant thyroid tumors were included in this study. Twelve MRCCT (85.7%) occurred as solitary lesions and the most frequently suspected lesions on ultrasonography were follicular tumors. On cytology, 46.2% of cases were reported as RCC or suspected RCC; a medical history of RCC and immunocytochemistry were helpful in interpretation. RCC metastasized to a follicular adenoma in 50.0% of the solitary lesions. MRCCTs with a long interval from the initial presentation, solitary lesion, and Ki-67 labeling index <10% showed significantly longer disease-free survival. MRCCT is characterized by a long interval from the initial presentation of RCC, appearance as a solitary nodule, ultrasonographic similarity to follicular tumors, sharing cytological findings with primary thyroid tumors, and high frequency of metastasis within follicular adenoma. A long interval from the initial presentation, occurrence as a solitary lesion, and low Ki-67 labeling index may be favorable prognostic factors. 相似文献
78.
Aki Tsuruhara Yuko Nagata Masaya Suzuki Koji Inui Ryusuke Kakigi 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》2013,226(3):347-355
Psychophysical and visual evoked potential (VEP) studies have shown that spatial frequency of a visual stimulus affects contrast sensitivity and VEPs in humans. However, it is not clear whether and how the effect of spatial frequency varies among cortical areas. Considering that all visual inputs to the retina could be expressed as a sum of sinusoidal gratings of different spatial frequencies, the effect of spatial frequency must be clarified to separate the brain activity specific to each visual stimulus. In order to examine the effect of spatial frequency on different cortical areas, the present study compared cortical responses to sinusoidal gratings of seven different spatial frequencies using magnetoencephalography (MEG). MEG waveforms of twelve healthy adults in response to sinusoidal gratings of 0.3–18.1 cycles per degree were subjected to a multi-dipole analysis. As a result, the effect of spatial frequency was significant on the first peak latency and amplitude of the source activity around V1 and V2 but not on the source activity around V3 and V6, indicating that the effect of spatial frequency varies across different visual areas in the human brain. Our results also suggest that the responses in V1 and V2 that have a peak around 90 ms and that of V6 peaking around 120 ms should be separated to investigate the stimulus-specific cortical response, particularly when examining effects of spatial frequency on the response latency. 相似文献
79.
Satoko Kojima Kei Kawana Kensuke Tomio Aki Yamashita Ayumi Taguchi Shiho Miura Katsuyuki Adachi Takeshi Nagamatsu Kazunori Nagasaka Yoko Matsumoto Takahide Arimoto Katsutoshi Oda Osamu Wada‐Hiraike Tetsu Yano Yuji Taketani Tomoyuki Fujii Danny J. Schust Shiro Kozuma 《American journal of reproductive immunology (New York, N.Y. : 1989)》2013,69(2):134-141
80.
Shimozawa N Suzuki Y Zhang Z Imamura A Ghaedi K Fujiki Y Kondo N 《Human molecular genetics》2000,9(13):1995-1999
Peroxisome biogenesis disorders, of which 13 complementation groups have been identified, are subdivided with regard to two major dysfunctions: peroxisomal matrix protein import and peroxisomal membrane synthesis. Detectable remnant membrane structures are evident only in the former. Molecular defects have been defined in 10 PEX genes, including eight related to protein import and two to membrane synthesis. We now have evidence that the human complete cDNA encoding Pex3p, a peroxisomal membrane protein (PMP) factor for the proper localization of PMPs, rescues the import of both PMP and the matrix protein in fibroblasts from a Zellweger syndrome patient of complementation group G. This patient was homozygous for a 1 base insertion in the codon for V182, which resulted in a change of codon (182-183) and introduced a termination codon (184), which inactivated PMP and matrix protein import by Pex3p. A PEX3-defective CHO mutant clone, ZPG208, was of the same complementation group as group G. 相似文献