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Novel control of cAMP-regulated transcription in vascular endothelial cells
Gillian R Milne1, Timothy M Palmer, Stephen J Yarwood
1Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK.
Insights
Targeting inflammation is crucial for cardiovascular disease. Researchers discovered a novel cAMP pathway in vascular cells that reduces inflammatory responses, paving the way for new anti-inflammatory drugs.
Area of Science:
- Cardiovascular biology and immunology
- Molecular mechanisms of inflammation
- Endothelial cell signaling
Background:
- Chronic inflammatory diseases like atherosclerosis are leading causes of death.
- While cholesterol is key, targeting inflammation in atherosclerotic lesions is also vital.
- Elevated interleukin-6 (IL-6) levels correlate strongly with coronary heart disease.
Purpose of the Study:
- To investigate novel cyclic adenosine monophosphate (cAMP)-regulated pathways.
- To understand how these pathways combat pro-inflammatory cytokines (IL-6, leptin) in vascular endothelial cells (VECs).
- To identify molecular mechanisms for developing new anti-inflammatory therapies for cardiovascular disease.
Main Methods:
- Studied cAMP-regulated pathways in VECs.
- Investigated the cAMP/Epac1/Rap1 signaling cascade.
- Analyzed the induction of CCAAT/enhancer-binding protein (C/EBP) transcription factors and suppressor of cytokine signalling 3 (SOCS3) gene expression.
Main Results:
- Unraveled molecular mechanisms of cAMP action in VECs.
- Demonstrated the cAMP/Epac1/Rap1 pathway initiates anti-inflammatory responses.
- Showed cAMP elevation mobilizes C/EBP transcription factors to induce SOCS3, attenuating pro-inflammatory cytokine signaling.
Conclusions:
- The cAMP/Epac1/Rap1 pathway provides a novel mechanism for combating endothelial inflammation.
- SOCS3 induction is a key outcome of this protective pathway.
- These findings will guide the development of next-generation pharmaceuticals for cardiovascular disease.
Abstract:
Chronic inflammatory diseases, such as atherosclerosis, are a major cause of death and disability in the developed world. In this respect, although cholesterol obviously plays a predominant role in atherosclerosis, targeting inflammation at lesion sites may be just as important. Indeed, elevated IL-6 (interleukin 6) levels are as strongly associated with coronary heart disease as increased cholesterol. We have been investigating novel cAMP-regulated pathways that combat the action of pro-inflammatory cytokines, such as IL-6 and leptin, in the VECs (vascular endothelial cells) of the circulatory system. In this respect, we have begun to unravel new molecular mechanisms by which the cAMP/Epac1 (exchange protein directly activated by cAMP 1)/Rap1 pathway can initiate a rigorous programme of protective anti-inflammatory responses in VECs. Central to this is the coupling of cAMP elevation to the mobilization of two C/EBP (CCAAT/enhancer-binding protein) family transcription factors, resulting in the induction of the SOCS3 (suppressor of cytokine signalling 3) gene, which attenuates pro-inflammatory cytokine signalling in VECs. These novel 'protective' mechanisms of cAMP action will inform the development of the next generation of pharmaceuticals specifically designed to combat endothelial inflammation associated with cardiovascular disease.
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