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Mogens Glass (University of São Paulo, Brazil)
1) The initial topic is chemoreceptor function in teleost fish. The regulation of respiratory function in these animals is highly O2-oriented and matches ever changing O2 levels of the aquatic environment, while acid-base status is regulated by modulation of bicarbonate levels through ion exchange in the gill and the kidney.
2) Both lungfish and tetrapods are descendants of the Sarcopterygians (the lobe-finned fish), and the air-breathing organ of lungfish (Dipnoi) is a real lung. This raises the question of the origins of respiratory control in land vertebrates. This is particularly relevant, because a combination of central and peripheral H+, CO2 receptors regulate acid-base status in lungfish and tetrapods, while the O2-oriented drive has a lower priority. Moreover, intrapulmonary CO2-receptors are known for lungfish and for non-mammalian tetrapods. These components are very specific and suggest a common ancestor. Meanwhile, possible central respiratory control in teleost fish remains uncertain. On the other hand, respiratory control in amphibians has increased and unexpected central sites appear to be involved.
3) A large increase of information has occurred in relation to respiratory control of mammals. Considerably detail is available for the function of the carotid body and for the central chemoreceptors. Much information has been obtained by recordings from individual cells.
| Lena
Sundin Göteborg University Sweden |
Control
of breathing during hypoxia: From a fish´s perspective |
| Adriana Paula Sanchez University of São Paulo Brazil |
Respiratory control in lungfish |
| Mogens
L.
Glass University of São Paulo Brazil |
Evolutionary aspects of chemoreceptor control: Comparison of lungfish and tetrapods |
| Stephen
Reid University of Toronto at Scarborough Canada |
The effects of chronic hypoxia and hypercapnia on central pH/CO2 respiratory-related chemoreception in amphibians |
| Ajay Kumar | A role for TRPC in chemotransduction? |
| Jerry Yu University of Louisville USA |
Biosensors for lung inflammation |
| Luciane H. Gargaglioni State University of Sao Paulo at Jaboticabal Brazil |
Locus coeruleus is a central chemoreceptive site in toads |
| Mark Burleson University of North Texas Denton, USA |
Effects of acclimatization to hypoxia on the alpha and beta adrenergic sensitivity of cardioventilatory control in channel catfish |
| Lynn Hartzler Wright State University Dayton, USA |
Chemosensitive Signaling in CO2-sensitive Neurons From the Rat Locus Coeruleus |
| Martin Wiemann University Duisburg-Essen Germany |
The role of sodium/proton exchanger 3 for central chemosensitivity in mammals |
| Vasily F. Pyatin Samara State Medical University Samara, Russia |
Modulation of the chemoreflexic respiratory and hypotensive responses to hypoxia by A5 neurons in the rat |
Related posters:
| Ellen Weihe Alfred Wegener Institute Bremerhaven, Germany |
Hypoxic stress response in intertidal and subtidal Antarctic limpets |
| Jalile Amin-Naves University of São Paulo Brazil |
Peripheral and central respiratory components of acid-base regulation in Lepidosiren paradoxa |
| Glauber dos S. F. da Silva University of São Paulo Brazil |
Control of pulmonary ventilation in lungfish, Lepidosiren paradoxa: The effects of temperature and hypoxia |