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Am J Obstet Gynecol. 2008 Sep;199(3):317.e1-6. doi: 10.1016/j.ajog.2008.06.091.

Lipopolysaccharide stimulation of trophoblasts induces corticotropin-releasing hormone expression through MyD88.

Author information

1
Division of Pediatric Infectious Diseases, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA.

Abstract

OBJECTIVE:

We hypothesized that intrauterine infection may lead to placental corticotrophin-releasing hormone (CRH) expression via Toll-like receptor signaling.

STUDY DESIGN:

To test this hypothesis JEG3 cells were stimulated with lipopolysaccharide (LPS), chlamydial heat shock protein 60, and interleukin (IL)-1. CRH expression was assessed by reverse transcription polymerase chain reaction (RT-PCR). The signaling mechanisms that were involved were examined in transient transfection experiments with beta-galactosidase, CRH-luciferase, cyclic adenosine monophosphate (AMP) response element-luciferase, dominant-negative (DN)-myeloid differentiation primary response gene (MyD88) and DN-toll-IL-1-receptor domain containing adapter inducing interferon (TRIF) vectors. Luciferase activity was determined by luciferase assay. Beta-galactosidase assay was performed to determine transfection efficiency.

RESULTS:

LPS, chlamydial heat shock protein 60, and IL-1 stimulation led to CRH expression in the JEG3 cells. LPS-induced CRH expression was not due to the autocrine effect of LPS-induced IL-1 because the supernatant from LPS-conditioned JEG3 cells did not induce CRH expression in the naïve cells. DN-MyD88, but not DN-TRIF, blocked the LPS-induced CRH expression. The cAMP response element did not play a role in LPS-induced CRH expression.

CONCLUSION:

Toll-like receptor signaling 4 may induce placental CRH expression through MyD88.

PMID:
18771998
PMCID:
PMC2587489
DOI:
10.1016/j.ajog.2008.06.091
[Indexed for MEDLINE]
Free PMC Article
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