期刊
JOURNAL OF APPLIED PHYSIOLOGY
卷 95, 期 4, 页码 1453-1459出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/japplphysiol.00558.2003
关键词
pseudorabies virus; transneuronal tracing; reticular formation; upper airway; tongue
资金
- NIDCD NIH HHS [R01 DC003732, R01 DC-03732, R01 DC003732-05] Funding Source: Medline
In prior experiments that employed the transneuronal transport of isogenic recombinants of pseudorabies virus (PRV), we demonstrated that neurons located ventrally in the medial medullary reticular formation (MRF) of the ferret provide collateralized projections to both diaphragm and abdominal muscle motoneurons as well as to multiple abdominal muscle motoneuron pools. The goal of the present study was to determine whether single MRF neurons also furnish inputs to diaphragm motoneurons and those innervating an airway muscle with inspiratory-related activity: the tongue protruder genioglossus. For this purpose, PRV recombinants expressing unique reporters (beta-galactosidase or enhanced green fluorescent protein) were injected into either the diaphragm or the genioglossal muscle. The virus injections produced transneuronal infection of overlapping populations of MRF neurons. A small proportion of these neurons (<15%) was infected by both PRV recombinants, which indicated that they provide collateralized inputs to genioglossal and diaphragm motoneurons. These findings show that, whereas some MRF neurons simultaneously influence the activity of upper airway and respiratory pump muscles, other cells in this brain stem region independently contribute to diaphragm and genioglossal muscle contraction regulation.
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