Linked Life Data

10606183

Source:http://linkedlifedata.com/resource/pubmed/id/10606183

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2000-2-3
pubmed:abstractText
The study was carried out on 53 patients who had thyroid cancer with various degree of differentiation. We studied the expression of bcl-2, a-erbB-2, p53, and p21 ras protein. The protein encoded by bCL-2 proto-oncogene is implicated in the prolongation of cell survival by blocking programmed cell death, i.e. apoptosis. The role of p53 and bcl-2 genes in the regulation of apoptosis has important implications in oncogenesis. Wild-type p53 is thought to promote apoptosis, whilst mutant p53 has a similar effect on apoptosis as bcl-2 that is inhibition of programmed cell kinase activity. C-erb-2 protein overexpression is currently being evaluated as a potential risk factor in breast cancer patients? The ras gene family codes for a 21 kD protein (p21), which binds guanine nucleotides and possesses GTPase activity. Through this mechanism, the ras p21 protein participates in the control of cell proliferation, possibly as a signal transducer from cell surface receptors to the nucleus. Activation of ras genes has been implicated in neoplastic transformation of cells. The aim of our study is to evaluate the expression of these markers in thyroid carcinomas. All immunohistochemical study was performed in paraffin-embedded tissues pathology specimen. Any well differentiated tumor in our study was positive for bcl-2 protein. C-erb-2 immunostaining was present in tumor samples in 60% of cases. In most cases, specific membrane staining as well as a weak cytoplasmic positivity of tumor cells were seen. Immunoreactivity for p53 was positive only in 10% of cases. By immunostaining, p21 protein was expressed in 55% of the 53 tumors tested, with different degree of expression. Only some poorly differentiated tumours were positive for bcl-2, furthermore all markers tested were strongly positive in these tumours. In conclusion, our results indicate that bcl-2, c-erbB-2, p53, and p21 ras protein are differently expressed in thyroid carcinomas in relation to the degree of aggressiveness and differentiation.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0392-9078
pubmed:author
pubmed:issnType
Print
pubmed:volume
18
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
363-7
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed-meshheading:10606183-Adenocarcinoma, Follicular, pubmed-meshheading:10606183-Adult, pubmed-meshheading:10606183-Aged, pubmed-meshheading:10606183-Apoptosis, pubmed-meshheading:10606183-Carcinoma, pubmed-meshheading:10606183-Carcinoma, Medullary, pubmed-meshheading:10606183-Carcinoma, Papillary, pubmed-meshheading:10606183-Cell Cycle, pubmed-meshheading:10606183-Cell Differentiation, pubmed-meshheading:10606183-Cell Division, pubmed-meshheading:10606183-Cyclin-Dependent Kinase Inhibitor p21, pubmed-meshheading:10606183-Cyclins, pubmed-meshheading:10606183-Gene Expression Regulation, Neoplastic, pubmed-meshheading:10606183-Genes, bcl-2, pubmed-meshheading:10606183-Genes, erbB-2, pubmed-meshheading:10606183-Genes, p53, pubmed-meshheading:10606183-Humans, pubmed-meshheading:10606183-Middle Aged, pubmed-meshheading:10606183-Neoplasm Invasiveness, pubmed-meshheading:10606183-Neoplasm Proteins, pubmed-meshheading:10606183-Proto-Oncogene Proteins c-bcl-2, pubmed-meshheading:10606183-Receptor, erbB-2, pubmed-meshheading:10606183-Thyroid Neoplasms, pubmed-meshheading:10606183-Tumor Suppressor Protein p53
pubmed:year
1999
pubmed:articleTitle
Expression of bcl-2, c-erbB-2, p53, and p21 (waf1-cip1) protein in thyroid carcinomas.
pubmed:affiliation
Dept. of Experimental Medicine and Pathology, University La Sapienza, Rome, Italy. mmelis@axrma.uniroma1.it
pubmed:publicationType
Journal Article, Comparative Study