Abstract
The carotid body (CB) is a polymodal chemoreceptor that triggers the hyperventilatory response to hypoxia necessary for the maintenance of O2 homeostasis essential for the survival of organs such as the brain or heart. Glomus cells, the sensory elements in the CB, are also sensitive to hypercapnia, acidosis and, although less generally accepted, hypoglycemia. Current knowledge on CB function is mainly based on studies performed on lower mammals, but the information on the human CB is scant. Here we describe the structure, neurotrophic properties, and cellular responses to hypoxia and hypoglycemia of CBs dissected from human cadavers. The adult CB parenchyma contains clusters of chemosensitive glomus (type I) and sustentacular (type II) cells as well as nestin-positive progenitor cells. This organ also expresses high levels of the dopaminotrophic glial cell line-derived neurotrophic factor (GDNF). GDNF production and the number of progenitor and glomus cells were preserved in the CBs of human subjects of advanced age. As reported for other mammalian species, glomus cells responded to hypoxia by external Ca2+-dependent increase of cytosolic [Ca2+] and quantal catecholamine release. Human glomus cells are also responsive to hypoglycemia and together the two stimuli, hypoxia and hypoglycemia, can potentiate each other’s effects. The chemo-sensory responses of glomus cells are also preserved at an advanced age. Interestingly, a neurogenic niche similar to that recently described in rodents is also preserved in the adult human CB. These new data on the cellular and molecular physiology of the CB pave the way for future pathophysiological studies involving this organ in humans.
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Abbreviations
- CB:
-
carotid body
- GDNF:
-
glial cell line-derived neurotrophic factor
- TH:
-
tyrosine hydroxylase
- GFAP:
-
glial fibrillary acidic protein
- DDC:
-
dopa-decarboxylase
- DAPI:
-
4′,6-diamidino-2-phenylindole
- BDNF:
-
brain derived neurotrophic factor
- IGF-1:
-
insulin-like growth factor-1
- HVA:
-
Hypoxic ventilatory acclimatization
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Acknowledgements
We wish to express our gratitude to Prof. Antonio Ordoñez as well as the members of the Coordination of Transplants Unit and the Neurosurgery Department of HUVR for their collaboration in the dissection of the vascular segments used in this study.
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This research was supported by the Botín Foundation and Axontherapix. Support was also received through grants from the ‘Consejería de Salud de la Junta Andalucía’ and the Spanish Ministries of Economy and Innovation, and Health (SAF, FIS, CIBERNED and TERCEL programmes).
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Ortega-Sáenz, P., Villadiego, J., Pardal, R., Toledo-Aral, J.J., López-Barneo, J. (2015). Neurotrophic Properties, Chemosensory Responses and Neurogenic Niche of the Human Carotid Body. In: Peers, C., Kumar, P., Wyatt, C., Gauda, E., Nurse, C., Prabhakar, N. (eds) Arterial Chemoreceptors in Physiology and Pathophysiology. Advances in Experimental Medicine and Biology, vol 860. Springer, Cham. https://doi.org/10.1007/978-3-319-18440-1_16
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