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 : 004B72Pollen 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 SimSource :
- Bioscience reports [ 0144-8463 ] ; 1993.
Descripteurs français
- KwdFr :
- Calcium (métabolisme), Humains (MeSH), Liaison aux protéines (MeSH), Lignée cellulaire (MeSH), Macrophages alvéolaires (métabolisme), Pollen (métabolisme), Protéine A associée au surfactant pulmonaire (MeSH), Protéines associées au surfactant pulmonaire (MeSH), Protéolipides (métabolisme), Surfactants pulmonaires (métabolisme).
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Calcium, Proteolipids, Pulmonary Surfactants.
- metabolism : Macrophages, Alveolar, Pollen.
- Cell Line, Humans, Protein Binding, Pulmonary Surfactant-Associated Protein A, Pulmonary Surfactant-Associated Proteins.
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:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Humans (MeSH)</term>
<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>
<term>Pulmonary Surfactant-Associated Proteins (MeSH)</term>
<term>Pulmonary Surfactants (metabolism)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><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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<term>Pollen</term>
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<front><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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<Abstract><AbstractText>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.</AbstractText>
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