The pattern of surfactant cholesterol during vertebrate evolution and development: does ontogeny recapitulate phylogeny?
Sandra Orgeig A D , Christopher B. Daniels A , Sonya D. Johnston A B and Lucy C. Sullivan A C
+ Author Affiliations
- Author Affiliations
A Environmental Biology, School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA 5005, Australia.
B Present address: Lung Function Laboratory, Department of Thoracic Medicine, Royal Adelaide Hospital, Adelaide, SA 5000, Australia.
C Present address: Department of Microbiology and Immunology, University of Melbourne, Melbourne, Vic. 3010, Australia.
D To whom correspondence should be addressed. email: sandra.orgeig@adelaide.edu.au
Reproduction, Fertility and Development 15(1) 55-73 https://doi.org/10.1071/RD02087
Submitted: 21 October 2002 Accepted: 21 January 2003 Published: 21 January 2003
Abstract
Pulmonary surfactant is a complex mixture of phospholipids (PLs), neutral lipids and proteins that lines the inner surface of the lung. Here it modulates surface tension, thereby increasing lung compliance and preventing the transudation of fluid. In humans, pulmonary surfactant is comprised of approximately 80% PLs, 12% neutral lipids and 8% protein. In most eutherian (i.e. placental) mammals, cholesterol (Chol) comprises approximately 8–10% by weight or 14–20 mol% of both alveolar and lamellar body surfactant. It is regarded as an integral component of pulmonary surfactant, yet few studies have concentrated on its function or control. The lipid composition is highly conserved within the vertebrates, except that surfactant of teleost fish is dominated by cholesterol, whereas tetrapod pulmonary surfactant contains a high proportion of disaturated phospholipids (DSPs). The primitive Australian dipnoan lungfish Neoceratodus forsterii demonstrates a ‘fish-type’ surfactant profile, whereas the other derived dipnoans demonstrate a surfactant profile similar to that of tetrapods. Homology of the surfactant proteins within the vertebrates points to a single evolutionary origin for the system and indicates that fish surfactant is a ‘protosurfactant’. Among the terrestrial tetrapods, the relative proportions of DSPs and cholesterol vary in response to lung structure, habitat and body temperature (T b), but not in relation to phylogeny. The cholesterol content of surfactant is elevated in species with simple saccular lungs or in aquatic species or in species with low T b. The DSP content is highest in complex lungs, particularly of aquatic species or species with high T b. Cholesterol is controlled separately from the PL component in surfactant. For example, in heterothermic mammals (i.e. mammals that vary their body temperature), the relative amount of cholesterol increases in cold animals. The rapid changes in the Chol to PL ratio in response to various physiological stimuli suggest that these two components have different turnover rates and may be packaged and processed differently.
In mammals, the pulmonary surfactant system develops towards the end of gestation and is characterized by an increase in the saturation of PLs in lung washings and the appearance of surfactant proteins in amniotic fluid. In general, the pattern of surfactant development is highly conserved among the amniotes. This conservation of process is demonstrated by an increase in the amount and saturation of the surfactant PLs in the final stages (>75%) of development. Although the ratios of surfactant components (Chol, PL and DSP) are remarkably similar at the time of hatching/birth, the relative timing of the maturation of the lipid profiles differs dramatically between species. The uniformity of composition between species, despite differences in lung morphology, birthing strategy and relationship to each other, implies that the ratios are critical for the onset of pulmonary ventilation. The differences in the timing, on the other hand, appear to relate primarily to birthing strategy and the onset of air breathing. As the amount of cholesterol relative to the phospholipids is highly elevated in immature lungs, the pattern of cholesterol during development and evolution represents an example of ontogeny recapitulating phylogeny. The fact that cholesterol is an important component of respiratory structures that are primitive, when they are not in use or developing in an embryo, demonstrates that this substance has important and exciting roles in surfactant. These roles still remain to be explored.
Acknowledgments
This work was funded by an Australian Research Council (ARC) Fellowship to S. Orgeig and an ARC Grant to C. Daniels.
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