Abstract：
:In mammals, the osmolality of the extracellular fluid (ECF) is highly stable despite radical changes in salt/water intake and excretion. Afferent systems are required to detect hypo- or hyperosmotic shifts in the ECF to trigger homeostatic control of osmolality. In humans, a pressor reflex is triggered by simply drinking water which may be mediated by peripheral osmoreceptors. Here, we identified afferent neurons in the thoracic dorsal root ganglia (DRG) of mice that innervate hepatic blood vessels and detect physiological hypo-osmotic shifts in blood osmolality. Hepatic sensory neurons are equipped with an inward current that faithfully transduces graded changes in osmolality within the physiological range (~15 mOsm). In mice lacking the osmotically activated ion channel, TRPV4, hepatic sensory neurons no longer exhibit osmosensitive inward currents and activation of peripheral osmoreceptors in vivo is abolished. We have thus identified a new population of sensory neurons that transduce ongoing changes in hepatic osmolality.
journal_name
Neuronjournal_title
Neuronauthors
Lechner SG,Markworth S,Poole K,Smith ES,Lapatsina L,Frahm S,May M,Pischke S,Suzuki M,Ibañez-Tallon I,Luft FC,Jordan J,Lewin GRdoi
10.1016/j.neuron.2010.12.028subject
Has Abstractpub_date
2011-01-27 00:00:00pages
332-44issue
2eissn
0896-6273issn
1097-4199pii
S0896-6273(10)01076-7journal_volume
69pub_type
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