Telomerase reverse transcriptase (TERT) expression and proliferation in canine brain tumours.

Abstract:

:Telomerase is a ribonucleoprotein enzyme complex that synthesizes telomere DNA. It is detected in 85-90% of malignant tumours in humans, but not in most somatic cells. Because telomerase plays a critical role in cell immortality, it represents an important target for anticancer therapies. We have previously shown that the dog is a potentially useful model for evaluating telomerase-based therapeutics. In this present study we analysed 93 canine brain tumours for telomerase reverse transcriptase (TERT) expression by immunohistochemistry. TERT immunoreactivity was detected in 16 of 50 grade 1 (32%) and 29 of 43 grade 2 tumours (67.4%), demonstrating a statistically significant association with histological grade (P = 0.00012). A subset of 51 tumours was also assessed for MIB-1 expression. The MIB-1 labelling index (LI) was found to correlate significantly with tumour grade, with a mean MIB-1 LI of 1.5% for grade 1 tumours, as compared with a mean MIB-1 LI of 21.7% for grade 2 tumours (P < 0.001). The MIB-1 LI was also significantly associated with TERT expression in all brain tumours (P < 0.001). These data further support the dog as a model for the preclinical development of telomerase-based therapeutics in brain tumours.

authors

Long S,Argyle DJ,Nixon C,Nicholson I,Botteron C,Olby N,Platt S,Smith K,Rutteman GR,Grinwis GC,Nasir L

doi

10.1111/j.1365-2990.2006.00776.x

subject

Has Abstract

pub_date

2006-12-01 00:00:00

pages

662-73

issue

6

eissn

0305-1846

issn

1365-2990

pii

NAN776

journal_volume

32

pub_type

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