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Related Concept Videos

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The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
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Human respiratory syncytial virus (RSV) is a widespread pathogen that primarily targets infants and young children but also poses a serious health risk to elderly and immunocompromised individuals. Belonging to the Pneumoviridae family, RSV is a negative-sense, single-stranded RNA virus within the Pneumovirus genus. Its global health burden is significant, with millions of cases annually resulting in hospitalizations and mortality, particularly in resource-limited settings. Although most...
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Related Experiment Video

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Sublingual Immunotherapy as an Alternative to Induce Protection Against Acute Respiratory Infections
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Pulmonary surfactant: an immunological perspective.

Zissis C Chroneos1, Zvjezdana Sever-Chroneos, Virginia L Shepherd

  • 1The Center of Biomedical Research, University of Texas Health Science Center at Tyler, Tyler, TX 75708-3154, USA. zissis.chroneos@uthct.edu

Cellular Physiology and Biochemistry : International Journal of Experimental Cellular Physiology, Biochemistry, and Pharmacology
|January 8, 2010
PubMed
Summary

Pulmonary surfactant, composed of lipids and proteins (SP-A, SP-B, SP-C, SP-D), is vital for lung immunity and gas exchange. This review explores surfactant

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Area of Science:

  • Pulmonary immunology
  • Respiratory physiology

Background:

  • Pulmonary surfactant maintains alveolar stability and gas exchange by reducing surface tension.
  • Surfactant also acts as a crucial component of the lung's innate immune system, preserving sterility and modulating immune responses.

Purpose of the Study:

  • To review current knowledge on the intricate interactions between pulmonary surfactant and the lung's innate host defense mechanisms.
  • To highlight the dual role of surfactant in both respiratory function and immune regulation.

Main Methods:

  • Literature review of existing research on pulmonary surfactant composition and function.
  • Analysis of studies investigating the immunological properties of surfactant proteins (SP-A, SP-B, SP-C, SP-D) and lipids.
  • Examination of receptor-mediated interactions in innate immunity.

Main Results:

  • Pulmonary surfactant comprises 90% lipids and 10% proteins (SP-A, SP-B, SP-C, SP-D), essential for its biophysical and structural integrity.
  • SP-A and SP-D (collectins) exhibit direct antimicrobial activities and modulate immune cell responses via specific receptors.
  • Emerging evidence suggests SP-B, SP-C, and surfactant lipids also possess significant immunoregulatory functions.

Conclusions:

  • Pulmonary surfactant plays a multifaceted role, critically supporting respiratory mechanics and innate immunity in the lungs.
  • Understanding the complex interplay between surfactant components and host defense is vital for developing novel therapeutic strategies for respiratory diseases.