Aerobic function in mitochondria persists beyond death by heat stress in insects
| Autor: | Ashley Ossher, Stephen Meigher, Timothy J. Bradley, Erica C. Heinrich, Felix Grün, Emilie M. Gray |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
030110 physiology
0301 basic medicine Male Hot Temperature Physiology Cellular respiration Acclimatization chemistry.chemical_element Mitochondrion Biology Biochemistry Oxygen 03 medical and health sciences chemistry.chemical_compound Respirometry Oxygen Consumption Botany Respiration Animals Critical thermal maximum Respiratory system Carbon Dioxide Aerobiosis Mitochondria chemistry Carbon dioxide Biophysics Drosophila Female General Agricultural and Biological Sciences Heat-Shock Response Developmental Biology |
| Zdroj: | Journal of thermal biology. 69 |
| ISSN: | 0306-4565 |
| Popis: | The critical thermal maximum (CTmax) of insects can be determined using flow-through thermolimit respirometry. It has been demonstrated that respiratory patterns cease and insects do not recover once the CTmax temperature has been reached. However, if high temperatures are maintained following the CTmax, researchers have observed a curious phenomenon whereby the insect body releases a large burst of carbon dioxide at a rate and magnitude that often exceed that of the live insect. This carbon dioxide release has been termed the post-mortal peak (PMP). We demonstrate here that the PMP is observed only at high temperatures, is oxygen-dependent, is prevented by cyanide exposure, and is associated with concomitant consumption of oxygen. We conclude that the PMP derives from highly active, aerobic metabolism in the mitochondria. The insect tracheal system contains air-filled tubes that reach deep into the tissues and allow mitochondria access to oxygen even upon organismal death. This unique condition permits the investigation of mitochondrial function during thermal failure in a manner that cannot be achieved using vertebrate organisms or in vitro preparations. |
| Databáze: | OpenAIRE |
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