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Expression of O6-Alkylguanine-DNA Alkyltransferase in Normal and Malignant Bladder Tissue of Egyptian Patients
Joint Authors
Saad, Abir A.
Kassem, Heba Sh.
Povey, Andrew C.
Margison, Geoffrey P.
Source
Issue
Vol. 2010, Issue 2010 (31 Dec. 2010), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2010-10-17
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
Bladder tumour tissues and corresponding uninvolved mucosa (normal tissue) of Egyptian bladder cancer patients were assessed for O6-alkylguanine-DNA-alkyltransferase (MGMT) activity by functional assay of tissue extracts (36 paired samples), and distribution by immunofluorescence (IF) microscopy of fixed material (24 paired samples).
MGMT varied widely from 42–253 fmoles/mg protein and from 3.2–40 fmoles/μg DNA in normal and 58–468 fmoles/mg protein and 2.5–49.5 fmoles/mg protein, in the tumour tissues; only one tumour had undetectable activity.
Pairwise comparison of MGMT activity in tumour and adjacent normal tissue showed no significant difference based on DNA content but was 1.75-fold higher in tumour (P<.01) based on protein.
There was no effect of gender or bilharzia infection status.
IF showed that in tumours, both the mean percentage of positive nuclei (57.3 ± 20.3%) and mean integrated IF (5.47 ± 3.66) were significantly higher than those in uninvolved tissues (42.8 ± 13.5% P=.04) and (1.89 ± 1.42; P<.01), respectively.
These observations suggest that, overall, MGMT levels are increased during human bladder carcinogenesis and that MGMT downregulation is not a common feature of bladder cancers.
Based on this, bladder cancers would be expected to be relatively resistant to chemotherapy which involved O6-guanine alkylating antitumour agents.
American Psychological Association (APA)
Saad, Abir A.& Kassem, Heba Sh.& Povey, Andrew C.& Margison, Geoffrey P.. 2010. Expression of O6-Alkylguanine-DNA Alkyltransferase in Normal and Malignant Bladder Tissue of Egyptian Patients. Journal of Nucleic Acids،Vol. 2010, no. 2010, pp.1-9.
https://search.emarefa.net/detail/BIM-502363
Modern Language Association (MLA)
Saad, Abir A.…[et al.]. Expression of O6-Alkylguanine-DNA Alkyltransferase in Normal and Malignant Bladder Tissue of Egyptian Patients. Journal of Nucleic Acids No. 2010 (2010), pp.1-9.
https://search.emarefa.net/detail/BIM-502363
American Medical Association (AMA)
Saad, Abir A.& Kassem, Heba Sh.& Povey, Andrew C.& Margison, Geoffrey P.. Expression of O6-Alkylguanine-DNA Alkyltransferase in Normal and Malignant Bladder Tissue of Egyptian Patients. Journal of Nucleic Acids. 2010. Vol. 2010, no. 2010, pp.1-9.
https://search.emarefa.net/detail/BIM-502363
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-502363