Increased LDL receptor mRNA expression in colon cancer is correlated with a rise in plasma cholesterol levels after curative surgery.

Abstract:

:It is currently under debate whether the low serum cholesterol levels that are frequently observed in cancer patients represent a risk factor for/or, rather, are a consequence of the tumour. We postulate that malignant tumours are directly involved in an increased catabolism of cholesterol-rich low-density lipoprotein (LDL) particles. In a prospective study of 25 patients with colorectal carcinoma, we measured intraindividual shifts in serum cholesterol levels after surgery, and the expression of LDL-receptor mRNA in surgically removed specimens. A significant rise in plasma cholesterol levels was observed in patients 3 and 12 months after curative surgery, but not after non-curative surgery. In human colon carcinoma tissues LDL receptor mRNA expression, as determined by competitive reverse-transcriptase-polymerase-chain reaction, was found to be significantly increased when compared to tissues from the tumour-free margin (median values, 1.2 x 10(6) vs. 2.0 x 10(5) molecules/micrograms total cellular RNA, respectively, n = 17). The extent of LDL-receptor mRNA expression positively correlated to the percentage rise of plasma cholesterol levels 3 months (n = 7, r = 0.8763) and 12 months (n = 6, r = 0.9181) after curative surgery. This finding provides in vivo evidence that the tumour tissue itself contributes to decreased plasma cholesterol levels in patients suffering from colorectal carcinomas. It supports the hypothesis that low cholesterol levels in cancer patients are a consequence, and not the cause, of the malignancy.

journal_name

Int J Cancer

authors

Niendorf A,Nägele H,Gerding D,Meyer-Pannwitt U,Gebhardt A

doi

10.1002/ijc.2910610405

subject

Has Abstract

pub_date

1995-05-16 00:00:00

pages

461-4

issue

4

eissn

0020-7136

issn

1097-0215

journal_volume

61

pub_type

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