Expression of hormone-sensitive lipase mRNA in macrophages.

Abstract:

:Macrophages contain a neutral cholesteryl ester hydrolase that can be activated by cAMP-dependent protein kinase. Immunological studies strongly suggest that hormone-sensitive lipase (HSL) is probably responsible for the cholesteryl ester hydrolase activity in macrophages; however, due to the very low level of expression in macrophages, it has been difficult to determine whether the macrophage cholesteryl ester hydrolase and adipose HSL are, in fact, products of the same gene. We have used the sensitive polymerase chain reaction (PCR) technique to demonstrate expression of HSL mRNA in resident and thioglycollate-elicited mouse peritoneal macrophages, as well as in the P388D1 mouse macrophage cell line. PCR was performed using oligonucleotide primer sequences present on adjacent exons of the mouse HSL gene to allow discrimination between products derived from HSL mRNA or genomic DNA sequences; specificity of the PCR was demonstrated by the absence of a product in liver, which does not express HSL mRNA. Northern blot analysis of poly (A)+ RNA from peritoneal macrophages with a mouse adipose HSL cDNA probe demonstrated a low abundance of mRNA of 3.2 kb, identical in size to HSL mRNA in adipose tissue. These findings, together with the results of previous studies demonstrating similarities between HSL and macrophage neutral cholesteryl ester hydrolase, strongly support the conclusion that both are products of a single gene. The development of a PCR assay for HSL mRNA may allow further study of the regulation of neutral cholesteryl ester hydrolase expression in macrophages and foam cells, and its potential role in atherogenesis.

journal_name

J Lipid Res

authors

Khoo JC,Reue K,Steinberg D,Schotz MC

subject

Has Abstract

pub_date

1993-11-01 00:00:00

pages

1969-74

issue

11

eissn

0022-2275

issn

1539-7262

journal_volume

34

pub_type

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