Changes in chromosomal proteins in colon cancer: the complexity and DNA-binding properties of tumor-associated proteins and evidence for their association with the malignant state in human colonic epithelium.

Abstract:

:The properties of two classes of nonhistone nuclear proteins (NHNP) whose appearance has been correlated with the process of carcinogenesis in the colonic epithelium of rats given 1,2-dimethylhydrazine (DMH) have been investigated. NHNP isolated from adenocarcinomas of the colon were tested for their binding to homologous DNA. The tumor-specific protein class TNP1 (molecular weight ca. 44,000) shows high affinity for DNA while the second class of tumor-specific proteins (TNP2; molecular weight ca. 62,000) does not bind to DNA. When tumor chromatin is subjected to a limited digestion with DNAse I under conditions that are known to preferentially digest active genes, the TNP1 proteins are selectively released, suggesting that this protein fraction is associated with the actively transcribing portions of the genome. The complexity of both tumor-specific protein classes has also been analyzed by two-dimensional gel electrophoresis. This method reveals a high degree of complexity both in TNP1 and TNP2. Protein classes similar to TNP1 and TNP2 that are also found in human colonic adenocarcinomas are not detectable in polyps from familial polyposis-affected patients at times when no sign of malignancy has yet appeared.

journal_name

Cancer

journal_title

Cancer

authors

Boffa LC,Allfrey VG

doi

10.1002/1097-0142(197711)40:5+<2584::aid-cncr28204

subject

Has Abstract

pub_date

1977-11-01 00:00:00

pages

2584-91

issue

5 Suppl

eissn

0008-543X

issn

1097-0142

journal_volume

40

pub_type

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