AI Article Synopsis
- Long-term facilitation (LTF) refers to a lasting increase in respiratory motor output due to episodic low oxygen levels, relying on serotonin.
- The study investigated LTF in two different strains of Sprague-Dawley rats from different vendors and found that while both strains exhibited LTF in phrenic activity, only one strain showed it in hypoglossal activity.
- The results suggest genetic differences between the two rat substrains influence their neural plasticity regarding hypoglossal LTF, despite similar serotonin levels in the relevant brain region.
Article Abstract
Long-term facilitation (LTF) is a prolonged, serotonin-dependent augmentation of respiratory motor output following episodic hypoxia. Previous observations lead us to hypothesize that LTF is subject to genetic influences and, as a result, differs between Sprague-Dawley (SD) rats from two vendors, Harlan (H) and Charles River Laboratories/Sasco (CRL/S). Using a blinded experimental design, we recorded integrated phrenic (integralPhr) and hypoglossal neurograms in anesthetized, vagotomized, paralyzed, and ventilated rats. At 60 min following three 5-min hypoxic episodes (Pa(O(2)) = 40 +/- 1 Torr; 5-min hyperoxic intervals), integralPhr was elevated from baseline in both SD substrains (i.e., LTF; P < 0.05). Conversely, hypoglossal LTF was present in CRL/S but not H rats (P < 0.05 between substrains). Serotonin immunoreactivity within the hypoglossal nucleus was not different between H and CRL/S rats. We conclude that the expression of hypoglossal LTF differs between SD rat substrains, indicating a difference in their genetic predisposition to neural plasticity.
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| http://dx.doi.org/10.1152/physiolgenomics.2001.4.3.175 | DOI Listing |
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