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Pollen grains bind to lung alveolar type II cells (A549) via lung surfactant protein A (SP-A).

Identifieur interne : 004B71 ( Main/Exploration ); précédent : 004B70; suivant : 004B72

Pollen grains bind to lung alveolar type II cells (A549) via lung surfactant protein A (SP-A).

Auteurs : R. Malhotra [Royaume-Uni] ; J. Haurum ; S. Thiel ; J C Jensenius ; R B Sim

Source :

RBID : pubmed:8374060

Descripteurs français

English descriptors

Abstract

Lung surfactant protein A (SP-A) is the most abundant surfactant-associated protein present in the lung. A receptor for SP-A has been shown to be present on A549 alveolar type II cells and on other cell types, including alveolar macrophage. The SP-A receptor on A549 cells has been identified as the collection receptor, or C1q receptor, which binds several structurally-related ligands. SP-A contains C-type lectin domains, but the role of carbohydrate binding by SP-A in physiological and pathological phenomena is not yet established. In this paper we report the binding of SP-A to pollen from Populus nigra italica (Lombardy Poplar), Poa pratensis (Kentucky blue grass), Secale cerale (cultivated rye) and Ambrosia elatior (short ragweed). Saturable and concentration dependent binding of SP-A to pollen grains was observed. Interaction of SP-A with pollen grains takes place through water-extractable components, in which the major species present, in Lombardy polar pollen, are 57 kD and 7 kD (glyco)proteins. The binding of SP-A to pollen grains and their aqueous extracts was calcium ion dependent and was inhibited by mannose, and is therefore mediated by the lectin domain. Binding of SP-A to pollen grains was found to mediate adhesion of pollen grains to A549 cells. The results suggest that pollen grains or other carbohydrate-bearing particles (e.g. microorganisms) could potentially interact with different cell types via the collection receptor (C1q Receptor) in the presence of SP-A.

DOI: 10.1007/BF01145960
PubMed: 8374060


Affiliations:


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Le document en format XML

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<term>Macrophages, Alveolar (metabolism)</term>
<term>Pollen (metabolism)</term>
<term>Protein Binding (MeSH)</term>
<term>Proteolipids (metabolism)</term>
<term>Pulmonary Surfactant-Associated Protein A (MeSH)</term>
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<term>Calcium (métabolisme)</term>
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<term>Macrophages alvéolaires (métabolisme)</term>
<term>Pollen (métabolisme)</term>
<term>Protéine A associée au surfactant pulmonaire (MeSH)</term>
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<div type="abstract" xml:lang="en">Lung surfactant protein A (SP-A) is the most abundant surfactant-associated protein present in the lung. A receptor for SP-A has been shown to be present on A549 alveolar type II cells and on other cell types, including alveolar macrophage. The SP-A receptor on A549 cells has been identified as the collection receptor, or C1q receptor, which binds several structurally-related ligands. SP-A contains C-type lectin domains, but the role of carbohydrate binding by SP-A in physiological and pathological phenomena is not yet established. In this paper we report the binding of SP-A to pollen from Populus nigra italica (Lombardy Poplar), Poa pratensis (Kentucky blue grass), Secale cerale (cultivated rye) and Ambrosia elatior (short ragweed). Saturable and concentration dependent binding of SP-A to pollen grains was observed. Interaction of SP-A with pollen grains takes place through water-extractable components, in which the major species present, in Lombardy polar pollen, are 57 kD and 7 kD (glyco)proteins. The binding of SP-A to pollen grains and their aqueous extracts was calcium ion dependent and was inhibited by mannose, and is therefore mediated by the lectin domain. Binding of SP-A to pollen grains was found to mediate adhesion of pollen grains to A549 cells. The results suggest that pollen grains or other carbohydrate-bearing particles (e.g. microorganisms) could potentially interact with different cell types via the collection receptor (C1q Receptor) in the presence of SP-A.</div>
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