Abstract:
:F10, a subline of the B16 mouse melanoma cell line, is itself the parent of the more metastatic BL6 line. BL6 cells differ from F10 cells by an alteration of the gene encoding the B56gamma regulatory subunit of protein phosphatase 2A (PP2A), which results in mRNA encoding a truncated variant of the subunit (deltagamma1). Expression of deltagamma 1 protein is detectable only when BL6 cells are transplanted into mice and then gamma-irradiated. Recently, B56gamma subunit-containing PP2A holoenzymes have shown to dephosphorylate Mdm2, a negative regulator of p53. Thus, we assessed whether the expression of deltagamma1 affects irradiation-induced phosphorylation of Mdm2 and radioresistance of melanoma cells by perturbing the regulation of p53. Western blot analyses revealed that irradiated COS-7 and NIH3T3 cells stably expressing deltagamma1 showed significantly less irradiation-induced Mdm2 phosphorylation. Mdm2 phosphorylation reduces the ability of Mdm2 to target p53 for degradation, which probably explained why p53 protein levels in NIH3T3 cells expressing deltagamma1 were not significantly elevated by irradiation, unlike in wild-type cells. This was also true for F10 cells transfected with deltagamma1 (F10deltagamma1) when the cells expressed deltagamma1 after being irradiated in vivo. p53 mRNA levels in irradiated wild-type and deltagamma 1-expressing cells were both only slightly elevated, suggesting that Mdm2 regulates p53 levels by a post-transcriptional mechanism. p53-mediated induction of the pro-apoptotic gene encoding Bax was also significantly lower in F10deltagamma1 cells irradiated in vivo. Moreover, F10deltagamma1 and BL6 cells were less apoptotic than F10 cells when the cells were irradiated in vivo. The p53 in F10 cells appears to be as functional as that in NIH3T3 cells because irradiation-induced expression of p53-target genes was comparable in both cells. Collectively, deltagamma1 appears to reduce irradiation-induced Mdm2 phosphorylation, which then blocks irradiation-stimulated p53 accumulation. Defects, such as deltagamma1, in PP2A may thus contribute to melanoma cell radioresistance.
journal_name
Histol Histopatholjournal_title
Histology and histopathologyauthors
Koma YI,Ito A,Watabe K,Kimura SH,Kitamura Ydoi
10.14670/HH-19.391subject
Has Abstractpub_date
2004-04-01 00:00:00pages
391-400issue
2eissn
0213-3911issn
1699-5848journal_volume
19pub_type
杂志文章abstract::Representative tumour sections from 468 patients with invasive breast cancer were immunostained for cyclooxygenase-2 (COX-2) and evaluated. The relationships between COX-2 expression, clinical outcome and various clinicopathological variables, including tumour vascularity and disseminated tumour cells (DTC) in the bon...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-27.1315
更新日期:2012-10-01 00:00:00
abstract::We have examined the ontogeny of somatostatin-, Glucagon-, Vasoactive Intestinal Polypeptide-, Substance P-, Neuropeptide Y, and Calcitonin gene-related peptide-Iike structures in the chicken retina by immunocytochemistry. Neuroblastic cells containing Substance P-Iike immunoreactivity (IR) first appeared at embryonic...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-18.1013
更新日期:2003-10-01 00:00:00
abstract::In the present study we examined prognostic value of immunohistochemical estimation of topoisomerase 1A (TOP 1A) and HER-2/neu expression in ovarian cancers treated with platinum-based drugs but not with topotecan and the relation between expression of these proteins on the one hand and intensity of proliferation (Ki6...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-21.713
更新日期:2006-07-01 00:00:00
abstract::In this paper we report the first complete mapping of the pituitary in a tuna species. The various different adenohypophysis cell types of the bluefin tuna, Thunnus thynnus L. have been identified and located using different antisera against mammalian and piscine hormones and various histochemical techniques: PAS, Alc...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-16.443
更新日期:2001-04-01 00:00:00
abstract::There is scarce information on the possible effects of chronic exposure to mercury on skeletal muscle. Dental personnel are frequently exposed to inhalation of metallic mercury vapours. The skeletal muscle of five technicians and one dentist (females, age 36-55) was studied. All of them presented symptoms of chronic m...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-15.673
更新日期:2000-07-01 00:00:00
abstract::Various microscopic methods have been used to analyze the morphology and molecular distribution of cells and tissues. Using conventional procedures, however, ischemic or anoxic artifacts are inevitably caused by tissue-resection or perfusion-fixation. The in vivo cryotechnique (IVCT) was developed to overcome these pr...
journal_title:Histology and histopathology
pub_type: 杂志文章,评审
doi:10.14670/HH-22.1281
更新日期:2007-11-01 00:00:00
abstract::The FHIT gene encompassing the most active common human fragile region, FRA3B, has been proposed as a tumour suppressor gene for important common human carcinomas. The mechanism in which Fhit protein exerts its tumour suppressor activity is still obscure. To further understand the Fhit function associated with its int...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-21.915
更新日期:2006-09-01 00:00:00
abstract::The need for an immunophenotypical referential framework relative to lymphoid follicle has led us to apply a panel of monoclonal and polyclonal antibodies, by means of a sensitive immunostaining method. Lymphoid follicle is an immunophenotypically complex structure made up of three lymphoid populations (B, being its b...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:
更新日期:1988-01-01 00:00:00
abstract::Nitric oxide (NO) is a widely recognized mediator of physiological and pathophysiological signal transmission. Its generation through L-arginine metabolism is relevant in the mesangium of the kidney where NO is produced by constitutive and inducible NO-synthase isoenzymes. Signaling is achieved through target interact...
journal_title:Histology and histopathology
pub_type: 杂志文章,评审
doi:10.14670/HH-15.1151
更新日期:2000-10-01 00:00:00
abstract::A novel family of evolutionally conserved neuronal guidance cues, including ligands (i.e., Slit, netrin, epherin, and semaphorin) and their corresponding receptors (i.e., Robo, DCC/Unc5, Eph and plexin/ neuropilin), has been identified to play a crucial role in axon pathfinding and branching as well as neuronal cell m...
journal_title:Histology and histopathology
pub_type: 杂志文章,评审
doi:10.14670/HH-25.1181
更新日期:2010-09-01 00:00:00
abstract::Osteoarthritis (OA) is characterized by cartilage attrition, subchondral bone remodeling, osteophyte formation and synovial inflammation. Perturbed homeostasis caused by inflammation, oxidative stress, mitochondrial dysfunction and proapoptotic/antiapoptotic dysregulation is known to impair chondrocyte survival in joi...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-26.1265
更新日期:2011-10-01 00:00:00
abstract::In the present work we analyze the cerebellum of chronic parkinsonian monkeys in order to clarify whether chronic mesencephalic depletion is associated with long term activation of the cerebellar neurons in chronic Parkinsonism. In our study, we observed a persistent activation of Purkinje cells in the cerebellum of c...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-27.89
更新日期:2012-01-01 00:00:00
abstract::CD45RO+ T cells are referred to as memory or helper-inducer while CD45RA+ T cells are regarded as naive or suppressor-inducer T cells. The former population predominates in the peripheral blood and even more in the synovial fluid of patients with rheumatoid arthritis, to the expense of the latter population. Within th...
journal_title:Histology and histopathology
pub_type: 杂志文章,评审
doi:10.14670/HH-15.587
更新日期:2000-04-01 00:00:00
abstract::Diabetic nephropathy (DN) is a major cause of end-stage renal disease (ESRD), however, specific treatment for DN has not yet been elucidated. Therefore, it is critically important to understand the molecular mechanism underlying DN to develop cause-related therapeutic strategy. To date, various factors such as hemodyn...
journal_title:Histology and histopathology
pub_type: 杂志文章,评审
doi:10.14670/HH-11-777
更新日期:2016-10-01 00:00:00
abstract:AIMS:The prognostic application of YES1 in epithelial ovarian cancer (EOC) is currently unclear. We aimed to investigate the expression of YES1 and its correlation with survival outcome in patients with EOC. METHODS:A retrospective study of patients diagnosed with EOC at the Cancer Center, Sun Yat-Sen University, Guan...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-18-203
更新日期:2020-07-01 00:00:00
abstract:INTRODUCTION:Germline mutations in the tumour suppressor gene dyskeratosis congenit 1 (DKC1) cause the cancer prone syndrome called X-linked dyskeratosis congenita. The present study aims to determine whether mutations of the DKC1 gene may also be present in frequent human sporadic cancers (breast, colon and lung cance...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-28.365
更新日期:2013-03-01 00:00:00
abstract::The purpose of our study was to elucidate pathways of genetically programmed cell death (apoptosis) in corneas with macular dystrophy. 10 corneal buttons (10 patients) with macular dystrophy and 8 buttons (8 patients) from enucleated eyes with chorioideal melanoma (controls) were analysed histologically. Immunohistoch...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-25.287
更新日期:2010-03-01 00:00:00
abstract::Multilocular cystic renal cell carcinoma (MCRCC) accounts for approximately 1 to 2% of all renal tumors. This tumor is currently classified as a subtype of clear cell RCC. Clinically, the majority of these tumors are incidentally found. Macroscopically, the tumor is well demarcated and consists of various-sized cysts....
journal_title:Histology and histopathology
pub_type: 杂志文章,评审
doi:10.14670/HH-27.969
更新日期:2012-08-01 00:00:00
abstract::The histological and ultrastructural features, as well as the immunoreactivity of one case of uncommon primary papillary and psammomatous adenocarcinoma of the umbilicus are studied in the present work. The observations have been undertaken in a nine-year follow-up, and have included the primitive tumour, two local re...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:
更新日期:1993-10-01 00:00:00
abstract::The nerve fiber distribution in the epidermis of the hairless rat skin was studied light microscopically by means of zinc iodide-osmium tetroxide staining. Two different morphological types of free nerve fiber endings could be detected: clusters of relatively thick nerve fibers stretched up through the spinous layer u...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-15.493
更新日期:2000-04-01 00:00:00
abstract::The liver represents a site of expression of neurotrophins and their receptors. We have characterized the expression and intracellular localization of the nerve growth factor (NGF) receptor, Trk-A, in liver cells in vivo and in vitro. In both normal and fibrotic liver tissue, Trk-A immunostaining was present in differ...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-23.327
更新日期:2008-03-01 00:00:00
abstract::Soft dental tissues have been identified as easily accessible sources of multipotent postnatal stem cells. Dental stem cells are mesenchymal stem cells (MSC) capable of differentiating into at least three distinct cell lineages: osteo/odontogenic, adipogenic and neurogenic. They express various markers including those...
journal_title:Histology and histopathology
pub_type: 杂志文章,评审
doi:10.14670/HH-29.699
更新日期:2014-06-01 00:00:00
abstract::Aurora A and Aurora B are serine-threonine kinase proteins which have both been implicated in human carcinogenesis through development of aneuploidy and chromosomal instability. The aim of the study is to assess the correlation of both markers with clinical and pathological parameters in patients with bladder cancer o...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-25.1371
更新日期:2010-11-01 00:00:00
abstract::The lower respiratory tract of the sheep was studied by light-microscopical immunocytochemistry for serotonin, cholecystokinin, somatostatin, bombesin and calcitonin during different periods of lung development; embryonic, foetal and postnatal. At embryonic period only intraepithelial serotonin-containing cells as sol...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:
更新日期:1992-10-01 00:00:00
abstract::Shotgun pellets containing bismuth (Bi) are widely used and may cause a rather intense exposure of some wild animals to Bi. A Bi shotgun pellet was implanted intramuscularly in the triceps surae muscle of 18 adult male Wistar rats. Another group of 9 animals had a Bi shotgun pellet implanted intracranially in the neoc...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-18.781
更新日期:2003-07-01 00:00:00
abstract::In the present study, morphological changes of the exocrine pancreas in rats after pancreatic duct ligation were examined with light microscopy (hematoxylin-eosin, TUNEL, and PCNA staining) and scanning electron microscopy in order to elucidate the effects of increased pancreatic duct pressure. On the fifth day after ...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-17.1033
更新日期:2002-10-01 00:00:00
abstract::Macrophages are important effector cells in cell-mediated immunity against intracellular infection. Among cytokines that macrophages are able to release are IL-12 and TNF alpha. IL-12 is a critical linker between the innate and adaptive cell-mediated immunity, capable of Th1 differentiation and IFN gamma release by T ...
journal_title:Histology and histopathology
pub_type: 杂志文章,评审
doi:10.14670/HH-15.199
更新日期:2000-01-01 00:00:00
abstract::It has been commonly supposed that adult stem cells co-localize with supporting cells within specific regions or specialized microenvironment in each tissue/organ, called stem cell niche. This concept was based on the assumption that stem cells are intrinsically hierarchical in nature. However, recent data indicate th...
journal_title:Histology and histopathology
pub_type: 杂志文章,评审
doi:10.14670/HH-25.397
更新日期:2010-03-01 00:00:00
abstract::Immunocytochemical demonstration of metallothionein (MT) has been reported as a useful prognostic tool in human breast cancer. The aim of this study was to determine the immunohistochemical location of MT in canine mammary tumours and its possible correlation with the morphologic characteristics of these tumours. Surg...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:10.14670/HH-14.51
更新日期:1999-01-01 00:00:00
abstract::An electron microscopic study of the myoepithelial cells in the chicken Harderian gland provides evidence that these cells can be transformed into myofibroblasts. After the application of a Brucella ovis suspension in sterile saline onto the eyeball, every 5 minutes for half an hour, myoepithelial cells gradually deve...
journal_title:Histology and histopathology
pub_type: 杂志文章
doi:
更新日期:1991-07-01 00:00:00