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Multiple signaling pathways regulate yeast cell death during the response to mating pheromones
Nan-Nan Zhang1, Drew D Dudgeon, Saurabh Paliwal
1Department of Biology and Whitaker Institute for Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
Molecular Biology of the Cell
|June 2, 2006
Summary
Yeast cells can undergo necrosis-like cell death when exposed to mating pheromones without a partner. This rapid cell death involves specific proteins and cell wall degradation, with different pathways influencing subsequent cell death waves.
Area of Science:
- Cell Biology
- Microbiology
- Biochemistry
Background:
- Mating pheromones are crucial for yeast cell differentiation and fusion.
- Yeast cells can experience cell death under specific stress conditions, including pheromone exposure.
Purpose of the Study:
- To investigate the mechanisms of cell death induced by mating pheromones in yeast.
- To identify the molecular players and pathways involved in pheromone-induced cell death.
Main Methods:
- Utilized clonal yeast cultures exposed to varying concentrations of mating pheromones.
- Employed genetic analysis of mutants deficient in specific signaling pathways (Fig1, Slt2/Mpk1, calcineurin).
- Monitored cell death, reactive oxygen species accumulation, and mitochondrial respiration.
Main Results:
- High pheromone concentrations induced rapid cell death requiring the transmembrane protein Fig1 and cell wall degradation.
- Slower cell death waves occurred in mutants lacking Slt2/Mpk1 or calcineurin signaling.
- All observed cell death mechanisms were necrosis-like, independent of apoptosis, and preceded by reactive oxygen species accumulation.
Conclusions:
- Yeast mating pheromones can trigger multiple necrosis-like cell death pathways.
- These pathways are activated when mating partners are absent or essential response pathways are compromised.
- Cellular responses to mating pheromones can lead to cell death through non-apoptotic mechanisms.