Chemical Carcinogen Induced Rat Mammary Carcinogenesis is a Potential Model of p21-activated kinase (PAK1) Positive Breast Cancer.

Abstract:

:The p21 activated kinase 1(PAK1) gene encodes a serine/threonine kinase that is overexpressed in a subset of human breast carcinomas with poor prognosis. The laboratory rat (Rattus norvegicus)orthologous gene is located at Mammary carcinoma susceptibility 3 (Mcs3) QTL on rat chromosome 1. We used quantitative PCR to determine effects of Mcs3 genotype and 7,12-dimethylbenz(a)anthracene (DMBA) exposure on Pak1expression. There was no effect of Mcs3genotype; however,there was a 3.5-fold higher Pak1level in DMBA-exposed mammary glands compared to unexposed glands (p<0.05). Sequence variants in Pak1exons did not alter amino acid sequence between Mcs3susceptible and resistant strains. Protein expression of PAK1/Pak1 in human breast carcinomas and DMBA-exposed rat mammary glands was detected using immunohistochemistry (IHC). Rat mammary glands from 12-week-old females not exposed to DMBA were negative for Pak1, while 24% of carcinogen-exposed mammary glands from age-matched females stained positive for Pak1. The positive mammary glands exposed to carcinogen had no pathological signs of disease. Human breast carcinomas, used as comparative controls, had a 22% positivity rats. This was consistent with other human breast cancer studies of PAK1 expression. Similar frequencies of human/rat PAK1/Pak1 expression in female breast carcinomas and carcinogen-induced rat mammary glands, showing no visible pathogenesis of disease, suggests aberrant PAK1 expression is an early event in development of some breast cancers. Laboratory rats will be a useful experimental organism for comparative studies of Pak1-mediated mechanisms of breast carcinogenesis. Future studies of PAK1 as a diagnostic marker of early breast disease are warranted.

journal_name

Physiol Genomics

journal_title

Physiological genomics

authors

Duderstadt EL,McQuaide SA,Sanders MA,Samuelson DJ

doi

10.1152/physiolgenomics.00112.2020

subject

Has Abstract

pub_date

2020-12-21 00:00:00

eissn

1094-8341

issn

1531-2267

pub_type

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