Interleukin-4 inhibits lipopolysaccharide-induced expression of prostaglandin H synthase-2 in human alveolar macrophages.

Abstract:

:Several studies have shown that interleukin-4 (IL-4) down-regulates synthesis of prostaglandin E2 (PGE2). We evaluated the mechanisms for this suppression in human alveolar macrophages (HAMs). Normal HAMs were obtained from healthy nonsmoking volunteers. The cells either remained unstimulated, or were exposed to 10 micrograms/ml of lipopolysaccharide (LPS) and/or various amounts of IL-4. LPS alone induced the synthesis of large amounts of PGE2 and prostaglandin H synthase-2 (PGHS-2) protein. This effect of LPS was suppressed by increasing amounts of IL-4. Expression of LPS-induced PGHS-2 mRNA was also inhibited by IL-4. In addition, IL-4 inhibited expression of CD14, which is a receptor for LPS bound to the LPS-binding protein (LBP). We conclude that IL-4 down-regulates LPS-induced release of PGE2, by reducing expression of the enzyme, PGHS-2. One potential mechanism for this effect of IL-4 is a reduced expression of CD14, which is the LPS-LBP receptor.

journal_name

J Cell Physiol

authors

Yano T,Hopkins HA,Hempel SL,Monick M,Hunninghake GW

doi

10.1002/jcp.1041650110

subject

Has Abstract

pub_date

1995-10-01 00:00:00

pages

77-82

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

165

pub_type

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