Rapid and reversible cell volume changes in response to osmotic stress in yeast
| Autor: | Teresa García-Gasca, Verónica Morales-Tlalpan, Casandra E. Villava, Jorge L. Chávez-Servín, Carlos Saldaña, Juan Campos-Guillén, Jimena Ramírez-Villarreal |
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| Rok vydání: | 2020 |
| Předmět: |
Osmotic shock
Saccharomyces cerevisiae chemistry.chemical_element Microbiology Oxygen Flow cytometry Cell wall 03 medical and health sciences Osmoregulation Fungal and Bacterial Physiology - Research Paper Osmotic Pressure Media Technology medicine 030304 developmental biology 0303 health sciences Water transport biology medicine.diagnostic_test 030306 microbiology biology.organism_classification Adaptation Physiological Yeast Volume (thermodynamics) chemistry Biophysics Potassium |
| Zdroj: | Braz J Microbiol |
| ISSN: | 1678-4405 |
| Popis: | Saccharomyces cerevisiae has evolved diverse mechanisms to osmotic changes: the cell wall, ion and water transport systems, and signaling cascades. At the present time, little is known about the mechanisms involved in short-term responses of osmotic stress in yeast or their physiological state during this process. We conducted studies of flow cytometry, wet weight measurements, and electron microscopy to evaluate the modifications in cell volume and the cell wall induced by osmotic stress. In response to osmotic challenges, we show very fast and drastic changes in cell volume (up to 60%), which were completed in less than eight seconds. This dramatic change was completely reversible approximately 16 s after returning to an isosmotic solution. Cell volume changes were also accompanied by adaptations in yeast metabolism observed as a reduction by 50% in the respiratory rate, measured as oxygen consumption. This effect was also fully reversible upon returning to an isosmotic solution. It is noteworthy that we observed a significant recovery in oxygen consumption during the first 10 min of the osmotic shock. The rapid adjustment of the cellular volume may represent an evolutionary advantage, allowing greater flexibility for survival. |
| Databáze: | OpenAIRE |
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