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[Cellular dysfunction in the pathogenesis of organ failure. New insights from molecular and cell biology]
1Klinik für Anästhesiologie und Intensivtherapie, Medizinische Fakultät Carl Gustav Carus, Technischen Universität Dresden, Fetscherstrasse 74, 01307 Dresden. tkoch@rcs.urz.tu-dresden.de
Abstract:
Multiple organ failure remains the major cause of death in critically ill patients. In view of therapeutic strategies, current research activities focus on the cellular response to different kinds of cellular stress (hypoxia, oxidative damage and mechanical distress) in the pathogenic sequelae of organ failure. The cellular stress reactions are characterized by induction of adaptive programs of gene expression (e.g. acute phase proteins, heat shock proteins, hypoxia-associated proteins) to protect the cells from energy depletion and cell death. Generally, the mitochondria are early indicators of cellular stress showing a loss of cytochrome c and a breakdown of the transmembrane potential. Shortage of ATP and decrease of pH can be observed in the cytoplasm which leads to a disintegration of the cytoskeleton. As a consequence, the cell becomes spherical and separates from the surrounding cells. Depending on the acuity of the stressor, the cell dies due to necrosis or apoptosis. Dysregulation of the balance of apoptosis and necrosis in different organs seems to be an important mechanism in the development of organ failure. New insights into the cellular mechanisms during organ dysfunction promote the development of new diagnostic (e.g., optical and spectroscopic) and pharmacological tools leading to a better prevention and therapy of organ failure.
Insights
Multiple organ failure, a leading cause of death in critical illness, is being studied at the cellular level. Research focuses on cellular stress responses and their role in organ dysfunction, aiming for better diagnostics and therapies.
Area of Science:
- Biomedical Science
- Cellular Biology
- Pathophysiology
Context:
- Multiple organ failure is a primary cause of mortality in critically ill patients.
- Current therapeutic strategies investigate cellular responses to stress in organ failure pathogenesis.
- Cellular stress involves adaptive gene expression programs to prevent cell death.
Purpose:
- To explore cellular stress responses, including mitochondrial dysfunction and cytoskeletal changes, in the context of organ failure.
- To understand the roles of necrosis and apoptosis in organ dysfunction.
- To identify new diagnostic and therapeutic targets for organ failure.
Summary:
- Cellular stress, triggered by hypoxia, oxidative damage, or mechanical distress, activates adaptive gene expression.
- Mitochondria are early indicators of stress, exhibiting loss of cytochrome c and transmembrane potential breakdown.
- Cytoplasmic changes like ATP depletion and pH decrease lead to cytoskeletal disintegration, cell rounding, and detachment, culminating in necrosis or apoptosis.
Impact:
- Understanding the apoptosis-necrosis balance in organ failure is crucial for elucidating disease mechanisms.
- New insights into cellular mechanisms of organ dysfunction are driving the development of novel diagnostic and pharmacological tools.
- Advances in cellular stress research promise improved prevention and treatment strategies for organ failure.
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