Differential levels of surfactant protein A, surfactant protein D, and progesterone to estradiol ratio in maternal serum before and after the onset of severe early‐onset preeclampsia

Host defense roles for the lung collectins, surfactant protein A (SP-A) and surfactant protein D (SP-D), were first suspected in the 1980s when molecular characterization revealed their sequence homology to the acute phase reactant of serum, mannose-binding lectin. Surfactant protein A and SP-D have since been shown to play diverse and important roles in innate immunity and pulmonary homeostasis. Their location in surfactant ideally positions them to interact with air-space pathogens. Despite extensive structural similarity, the two proteins show many functional differences and considerable divergence in their interactions with microbial surface components, surfactant lipids, and other ligands. Recent crystallographic studies have provided many new insights relating to these observed differences. Although both proteins can participate in calcium-dependent interactions with sugars and other polyols, they display significant differences in the spatial orientation, charge, and hydrophobicity of their binding surfaces. Surfactant protein D appears particularly adapted to interactions with complex carbohydrates and anionic phospholipids, such as phosphatidylinositol. By contrast, SP-A shows features consistent with its preference for lipid ligands, including lipid A and the major surfactant lipid, dipalmitoylphosphatidylcholine. Current research suggests that structural biology approaches will help to elucidate the molecular basis of pulmonary collectin—ligand recognition and facilitate development of new therapeutics based upon SP-A and SP-D.

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Assignment of the Human Pulmonary Surfactant Protein D Gene (SFTP4) to 10q22-q23 Close to the Surfactant Protein A Gene Cluster

Genomics ◽

10.1006/geno.1993.1324 ◽

1993 ◽

Vol 17 (2) ◽

pp. 294-298 ◽

Cited By ~ 42

Author(s):

Konrad Kölble ◽

Jinhua Lu ◽

Sara E. Mole ◽

Stefan Kaluz ◽

Kenneth B.M. Reid

Keyword(s):

Gene Cluster ◽

Pulmonary Surfactant ◽

Protein A ◽

Surfactant Protein ◽

Surfactant Protein A ◽

Surfactant Protein D ◽

Pulmonary Surfactant Protein

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Rat surfactant protein D enhances the production of oxygen radicals by rat alveolar macrophages

Biochemical Journal ◽

10.1042/bj2860005 ◽

1992 ◽

Vol 286 (1) ◽

pp. 5-8 ◽

Cited By ~ 81

Author(s):

J F Van Iwaarden ◽

H Shimizu ◽

P H M Van Golde ◽

D R Voelker ◽

L M G Van Golde

Keyword(s):

Alveolar Macrophages ◽

Oxygen Radicals ◽

Protein A ◽

Surfactant Protein ◽

Surfactant Protein A ◽

Surfactant Protein D ◽

Dependent Manner ◽

Concentration Dependent Manner ◽

Oxygen Radical Production ◽

Stimulation Of

Rat surfactant protein D (SP-D) was shown to enhance the production of oxygen radicals by rat alveolar macrophages. This enhancement, which was determined by a lucigenin-dependent chemiluminescence assay, was maximal after 18 min at an SP-D concentration of 0.2 micrograms/ml. Surfactant lipids did not influence the stimulation of alveolar macrophages by SP-D, whereas the oxygen-radical production of these cells induced by surfactant protein A was inhibited by the lipids in a concentration-dependent manner.

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Protective effect of extracorporeal membrane pulmonary oxygenation combined with cardiopulmonary resuscitation on post-resuscitation lung injury: a randomised controlled trial

10.21203/rs.3.rs-37919/v1 ◽

2020 ◽

Author(s):

Jiyang Ling ◽

Chunsheng Li ◽

Yun Zhang ◽

Xiaoli Yuan ◽

Bo Liu ◽

...

Keyword(s):

Superoxide Dismutase ◽

Protein A ◽

Surfactant Protein ◽

Spontaneous Circulation ◽

Clara Cell ◽

Surfactant Protein A ◽

Cell Protein ◽

Surfactant Protein D ◽

Lung Water ◽

Pulmonary Vascular Permeability

Abstract Background: This work examines the protective effect and mechanisms of early extracorporeal membrane oxygenation with cardiopulmonary resuscitation (CPR) on ventricular-fibrillation-induced post-resuscitation lung injury in a swine cardiac-arrest model. Methods: Sixteen male swine were randomised to conventional CPR (CCPR; n=8; CCPR alone) and extracorporeal CPR (ECPR; n=8; extracorporeal membrane oxygenation with CCPR), with restoration of spontaneous circulation for 6 h as an endpoint. Serological specimens were collected at baseline and restoration of spontaneous circulation for 1, 2, 4, and 6 h; lung tissue specimens were obtained postmortem. Between-group comparisons of recovery success rate, extravascular lung water , pulmonary vascular permeability index, electron microscopic features, and serum and tissue biomarkers (surfactant protein A, surfactant protein D, Clara cell protein 16, superoxide dismutase, malondialdehyde, myeloperoxidase) were undertaken. Results: The CCPR group had non-significantly lower 6-h survival rate ( p> 0.05). Serum levels of surfactant protein A, surfactant protein D, Clara cell protein 16, and malondialdehyde were significantly higher ( p< 0.05), whereas serum superoxide dismutase was significantly lower, in the CCPR than in the ECPR group ( p <0.01). Compared with the ECPR group, tissue surfactant protein A, surfactant protein D, and superoxide dismutase significantly decreased compared to the baseline, whereas malondialdehyde and myeloperoxidase significantly increased ( p< 0.01) in the CCPR group. Extravascular lung water and pulmonary vascular permeability index were significantly higher in the CCPR after 6 h compared to the baseline values and the ECPR group ( p< 0.01). Conclusions: Electron microscopy revealed mostly vacuolated intracellular alveolar type II lamellar bodies and fuzzy lamellar structure and widening and blurring of the blood–gas barrier in the CCPR group in contrast to that in the ECPR group. ECPR was found to have protective pulmonary effects, possibly related to the regulation of alveolar surface-active proteins and mitigated oxidative stress response post-resuscitation.

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Surfactant protein A down-regulates epidermal growth factor receptor by mechanisms different from those of surfactant protein D

Journal of Biological Chemistry ◽

10.1074/jbc.m117.800771 ◽

2017 ◽

Vol 292 (45) ◽

pp. 18565-18576 ◽

Cited By ~ 2

Author(s):

Yoshihiro Hasegawa ◽

Motoko Takahashi ◽

Shigeru Ariki ◽

Atsushi Saito ◽

Yasuaki Uehara ◽

...

Keyword(s):

Epidermal Growth Factor Receptor ◽

Growth Factor ◽

Epidermal Growth Factor ◽

Protein A ◽

Growth Factor Receptor ◽

Surfactant Protein ◽

Surfactant Protein A ◽

Surfactant Protein D ◽

Epidermal Growth

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Efficient resolution of Pneumocystis murina infection in surfactant protein A-deficient mice following withdrawal of corticosteroid-induced immunosuppression

Journal of Medical Microbiology ◽

10.1099/jmm.0.46190-0 ◽

2006 ◽

Vol 55 (2) ◽

pp. 143-147 ◽

Cited By ~ 8

Author(s):

Michael Linke ◽

Alan Ashbaugh ◽

Judith Koch ◽

Reiko Tanaka ◽

Peter Walzer

Keyword(s):

Protein A ◽

Lavage Fluid ◽

Surfactant Protein ◽

Lung Lavage ◽

Surfactant Protein A ◽

Surfactant Protein D ◽

Wild Type ◽

Enhanced Expression ◽

Lymphocyte Populations ◽

Deficient Mice

Following withdrawal of immunosuppression, surfactant protein A (SP-A)-deficient and wild-type mice cleared Pneumocystis murina infection in a similar manner, but exhibited significant differences in lymphocyte populations, interleukin (IL)-6 levels and chemokine expression levels. A higher percentage of lymphocytes were detected in lung lavage fluid from SP-A-deficient mice, but more CD4+ T cells were isolated from lung tissue of wild-type mice. Higher concentrations of IL-6 were detected in lavage fluid and enhanced expression of lymphotactin and RANTES were detected in the lungs of wild-type mice. Equal levels of surfactant protein D were detected in SP-A-deficient and wild-type mice and no differences were detected in markers of lung injury between the two strains of mice. Thus, SP-A does not enhance organism clearance, but does modulate the host immune response during resolution of P. murina infection.

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