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J Appl Physiol (March 28, 2003). doi:10.1152/japplphysiol.00137.2003
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Submitted on February 10, 2003
Accepted on March 17, 2003

Structure of slowly adapting pulmonary stretch receptors in the lung periphery

J. Yu1*, Y. F. Wang1, and J. W. Zhang1

1 Department of Pulmonary Medicine, University of Louisville, Louisville, KY, USA

* To whom correspondence should be addressed. E-mail: j0yu0001{at}gwise.louisville.edu.

Pulmonary sensory receptors are the initiating sites for lung reflexes, however, little is known about their structure, and especially the relationship between the structure and function of these receptors. Using a novel approach (combining electrophysiological and morphological techniques), we examined the structures of the typical slowly adapting pulmonary stretch receptors (SARs) located in the lung periphery. We recorded SAR activities in the cervical vagus nerve, identified the receptive field, dissected the SARs in blocks, fixed and processed these blocks for immunohistochemical staining using anti-Na+/K+-ATPase, and examined the blocks under a confocal microscope. These SAR structures have multiple endings that have terminal knobs. Some structures that are located in the airway walls have terminal knobs buried in smooth muscle. Others are in the most peripheral part of the lung and their terminal knobs have no obvious relation to smooth muscle, suggesting that muscle contraction may not be a direct factor for SAR activation.




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