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Related Experiment Videos

Surfactant protein A-binding proteins. Characterization and structures

D S Strayer1, S Yang, H H Jerng

  • 1Department of Pathology and Cell Biology, Jefferson Medical College, Philadelphia, Pennsylvania 19107.

The Journal of Biological Chemistry
|September 5, 1993
PubMed
Summary
This summary is machine-generated.

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Researchers identified a novel alveolar cell membrane protein, SPAR, that binds surfactant protein A (SP-A) and regulates lung surfactant secretion. This discovery offers new insights into pulmonary surfactant regulation.

Area of Science:

  • Pulmonary Medicine
  • Cell Biology
  • Biochemistry

Background:

  • Alveolar cell membrane proteins play a role in regulating pulmonary surfactant secretion.
  • Surfactant protein A (SP-A) is crucial for lung function, but its specific cell membrane receptors are not fully understood.

Purpose of the Study:

  • To identify and characterize alveolar cell membrane proteins that bind SP-A.
  • To elucidate the role of these proteins in regulating surfactant secretion.

Main Methods:

  • Utilized anti-idiotype antibodies to identify SP-A binding proteins.
  • Isolated and sequenced cDNAs encoding SP-A binding proteins from human and porcine lung expression libraries.
  • Produced recombinant proteins for binding assays and structural analysis.
  • Investigated transcript and protein distribution using in situ hybridization and immunohistochemistry.

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Main Results:

  • Identified a ~30 kDa alveolar cell membrane protein that binds SP-A, termed SP-A recognition (SPAR) protein.
  • Isolated homologous cDNAs from human and porcine lungs, encoding similar ~32 kDa SPAR proteins.
  • Recombinant SPAR proteins demonstrated specific binding to SP-A and anti-idiotype antibodies.
  • SPAR transcripts and proteins were primarily localized to type II pneumocytes in the lung.

Conclusions:

  • Isolated and characterized cDNAs for SP-A binding proteins (SPAR) from two species.
  • SPAR proteins are likely cell membrane receptors involved in SP-A binding and surfactant secretion regulation.
  • Further studies on SPAR proteins may reveal mechanisms of pulmonary surfactant secretion control.