Estrogen-mediated activation of non-genomic pathway improves macrophages cytokine production following trauma-hemorrhage.

Abstract

Although 17beta-estradiol (E2) attenuates the alterations in Kupffer cells and splenic macrophages (MPhi) cytokine production following trauma-hemorrhage, the mechanism by which this occurs remains unknown. Utilizing a cell-impermeable E2 conjugated with BSA (E2-BSA), we examined the non-genomic effects of E2 on the above two cell population cytokine production, MAPK and transcription factors activation following trauma-hemorrhage. Male Sprague-Dawley rats underwent trauma-hemorrhage (mean BP 40 mmHg for 90 min, then resuscitation). E2, E2-BSA (1 mg/kg E2) with or without an estrogen receptor antagonist (ICI 182,780), or vehicle was administrated during resuscitation. Two hrs thereafter, Kupffer cells and SMPhi production of IL-6, TNF-alpha, and IL-10, activation of MAPK (p38, ERK-1/2, and JNK), and transcription factors (NF-kappaB and AP-1) were determined. IL-6, TNF-alpha, and IL-10 productive capacity, MAPK, and transcription factors activation increased in Kupffer cells while they decreased in SMPhi following trauma-hemorrhage. However, E2 administration normalized all of these alterations. Although E2-BSA also attenuated the alterations in cytokine production/transcription factors, the values were higher in Kupffer cells and lower in SMPhi compared to shams. In contrast, E2-BSA prevented trauma-hemorrhage-mediated changes in MAPK activation to the same extent as E2. Co-administration of ICI 182,780 abolished E2-BSA effects. Although some MAPK inhibitors suppressed cytokine production, the inhibitor effectiveness was dependent on cytokine, cell type and animal condition (trauma-hemorrhage or sham). Thus, E2 effects on Kupffer cells and SMPhi cytokine production and transcription factors activation following trauma-hemorrhage are mediated at least in part via non-genomic pathway and these non-genomic effects are likely mediated via MAPK pathways.

• Authors: Takao Suzuki, Huang-Ping Yu, Ya-Ching Hsieh, Mashkoor A Choudhry, Kirby I Bland, Irshad H Chaudry
• Journal: Journal of cellular physiology (J Cell Physiol) Vol. 214 Issue 3 Pg. 662-72 (Mar 2008) ISSN: 1097-4652 [Electronic] United States
• PMID: 17786973 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
• Copyright: (c) 2007 Wiley-Liss, Inc.

Chemical References

• Cytokines
• Enzyme Inhibitors
• Estrogens
• Lipopolysaccharides
• NF-kappa B
• Transcription Factor AP-1
• DNA
• Extracellular Signal-Regulated MAP Kinases
• JNK Mitogen-Activated Protein Kinases
• p38 Mitogen-Activated Protein Kinases

Topics

• Animals
• Cytokines (biosynthesis)
• DNA (metabolism)
• Enzyme Inhibitors (pharmacology)
• Estrogens (pharmacology)
• Extracellular Signal-Regulated MAP Kinases (antagonists & inhibitors, metabolism)
• Genome
• Hemorrhage (chemically induced, pathology)
• JNK Mitogen-Activated Protein Kinases (antagonists & inhibitors, metabolism)
• Kupffer Cells (cytology, drug effects, enzymology)
• Lipopolysaccharides (pharmacology)
• Macrophages (drug effects, enzymology, metabolism)
• Male
• NF-kappa B (metabolism)
• Phosphorylation (drug effects)
• Protein Binding (drug effects)
• Rats
• Rats, Sprague-Dawley
• Spleen (cytology, drug effects, enzymology)
• Transcription Factor AP-1 (metabolism)
• p38 Mitogen-Activated Protein Kinases (antagonists & inhibitors, metabolism)