Pulmonary surfactant inactivation by β-D-glucan and protective role of surfactant protein A



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Cañadas Benito, Olga and Sáenz Martínez, Alejandra and Lorenzo Avilés, Alba de and Casals Carro, Cristina (2022) Pulmonary surfactant inactivation by β-D-glucan and protective role of surfactant protein A. Colloids and Surfaces B: Biointerfaces, 210 . p. 112237. ISSN 0927-7765

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Official URL: https://doi.org/10.1016/j.colsurfb.2021.112237


Pulmonary fungal infections lead to damage of the endogenous lung surfactant system. However, the molecular mechanism underlying surfactant inhibition is unknown. β-D-glucan is the major component of pathogenic fungal cell walls and is also present in organic dust, which increases the risk of respiratory diseases. The objective of this study was to characterize the interaction of this D-glucopyranose polymer with pulmonary surfactant. Our results show that β-D-glucan induced a concentration-dependent inhibition of the surface adsorption, respreading, and surface tension-lowering activity of surfactant preparations containing surfactant proteins SP-B and SP-C. Our data support a new mechanism of surfactant inhibition that consists in the extraction of phospholipid molecules from surfactant membranes by β-D-glucan. As a result, surfactant membranes became more fluid, as demonstrated by fluorescence anisotropy, and showed decreased Tm and transition enthalpy. Surfactant preparations containing surfactant protein A (SP-A) were more resistant to β-D-glucan inhibition. SP-A bound to different β-D-glucans with high affinity (Kd = 1.5 ± 0.1 nM), preventing and reverting β-D-glucan inhibitory effects on surfactant interfacial adsorption and partially abrogating β-D-glucan inhibitory effects on surfactant’s reduction of surface tension. We conclude that β-D-glucan inhibits the biophysical function of surfactant preparations lacking SP-A by subtraction of phospholipids from surfactant bilayers and monolayers. The increased resistance of SP-A-containing surfactant preparations to β-D-glucan reinforces its use in surfactant replacement therapy.

Item Type:Article
Additional Information:

CRUE-CSIC (Acuerdos Transformativos 2021)

Uncontrolled Keywords:Lung, Phosphatidylcholine, SP-ASurfactant inhibition, Membrane fluidity, Monolayers
Subjects:Sciences > Chemistry > Chemical engineering
ID Code:70128
Deposited On:08 Feb 2022 11:02
Last Modified:18 Oct 2022 08:51

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