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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Mitogen-activated protein kinase pathways and cardiac surgery
Tanveer A Khan1, Cesario Bianchi, Marc Ruel
1Division of Cardiothoracic Surgery, Beth Israel Deaconess Medical Center, 110 Francis Street, Suite 2A, Boston, MA 02215, USA.
The Journal of Thoracic and Cardiovascular Surgery
|March 6, 2004
Summary
Mitogen-activated protein kinases (MAPKs) are crucial in cardiac surgery complications. Our study shows altered MAPK activity, specifically extracellular signal-regulated kinases, contributes to microcirculatory dysfunction after bypass, impacting organ perfusion.
Area of Science:
- Cardiovascular Biology
- Molecular Signaling
- Surgical Research
Background:
- Mitogen-activated protein kinases (MAPKs) are serine-threonine protein kinases involved in critical cardiac surgery processes like vascular permeability and reperfusion injury.
- MAPKs are expressed in cardiomyocytes, vascular endothelial cells, and smooth muscle cells, participating in signal transduction cascades activated by ischemia and other stimuli.
- Key MAPK families include extracellular signal-regulated kinases (ERK), c-Jun NH(2)-terminal kinases (JNK), and p38 kinases, all implicated in cardiovascular signaling.
Purpose of the Study:
- To investigate the role of MAPK pathways, particularly ERK, in myocardial responses to cardiac surgery.
- To determine if alterations in ERK activity are associated with coronary microcirculatory dysfunction following cardioplegia and cardiopulmonary bypass.
- To explore the potential of targeting MAPK pathways for preventing surgical morbidity.
Main Methods:
- Analysis of myocardial tissue and signaling pathways in human subjects undergoing cardiac surgery.
- Assessment of extracellular signal-regulated kinase (ERK) pathway activity.
- Evaluation of coronary microcirculatory function in relation to ERK activity.
Main Results:
- Alterations in myocardial ERK pathway activity were observed following cardioplegia-cardiopulmonary bypass in human subjects.
- Differences in ERK activity were found to mediate coronary microcirculatory dysfunction linked to the surgical procedure.
- These changes in microcirculation may negatively affect organ perfusion and function.
Conclusions:
- Mitogen-activated protein kinase pathways, especially ERK, are significantly altered by cardiac surgery with cardioplegia-cardiopulmonary bypass.
- ERK pathway dysregulation contributes to coronary microcirculatory dysfunction, potentially leading to adverse organ effects.
- Further characterization of MAPK pathways could improve strategies for mitigating cardiac surgery-related morbidity.
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