Autoantibodies in primary Sjögren's syndrome patients induce internalization of muscarinic type 3 receptors
Copyright © 2011 Elsevier B.V. All rights reserved..
OBJECTIVES: Primary Sjögren's syndrome (pSS) is a systemic autoimmune disease characterized by lymphocyte infiltration into the salivary and lachrymal glands, leading to dry mouth and eyes. The presence of functional autoantibodies against muscarinic type 3 receptor (M3R) has been reported in pSS patients. However, the pathological role of anti-M3R autoantibodies in pSS salivary dysfunction remains controversial.
METHODS: Purified IgGs were obtained from normal (control) and primary SS patients' sera (pSS IgG). Internalization of M3R and clathrin was analyzed by biochemical assay and immunofluorescence confocal microscopy using human submandibular gland (hSMG) cells. Cytoplasmic free Ca(2+) concentration ([Ca(2+)](i)) was measured by microspectrofluorimetry.
RESULTS: Incubation of hSMG cells with pSS IgG (1mg/ml) significantly decreased M3R expression levels at the membrane. Carbachol-induced [Ca(2+)](i) transients (CICTs) in these cells were also inhibited by pSS IgG. In contrast to pSS IgG, control IgG had no effect on both the M3R expression level and CICTs. We found that binding of pSS IgG to M3R induces phosphorylation of the receptor, and that the pSS IgG-induced M3R internalization is prevented by the lysosomal inhibitor, chloroquine. In addition, pSS IgG decreased membrane clathrin expression, which was inhibited by atropine. Our immunofluorescence study further confirmed that pSS IgG induces a co-localization of M3R with clathrin and subsequent internalization of M3R.
CONCLUSION: pSS IgG induces internalization of M3R partly through a clathrin-mediated pathway. The results suggest M3R internalization as a potential mechanism to explain the exocrinopathy seen in pSS patients.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2012 |
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| Erschienen: |
2012 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:1822 |
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| Enthalten in: |
Biochimica et biophysica acta - 1822(2012), 2 vom: 17. Feb., Seite 161-7 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Jin, Meihong [VerfasserIn] |
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| Links: |
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| Themen: |
886U3H6UFF |
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| Anmerkungen: |
Date Completed 10.07.2012 Date Revised 26.11.2016 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.bbadis.2011.11.012 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM213565641 |
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| 100 | 1 | |a Jin, Meihong |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Autoantibodies in primary Sjögren's syndrome patients induce internalization of muscarinic type 3 receptors |
| 264 | 1 | |c 2012 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
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| 500 | |a Date Completed 10.07.2012 | ||
| 500 | |a Date Revised 26.11.2016 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Copyright © 2011 Elsevier B.V. All rights reserved. | ||
| 520 | |a OBJECTIVES: Primary Sjögren's syndrome (pSS) is a systemic autoimmune disease characterized by lymphocyte infiltration into the salivary and lachrymal glands, leading to dry mouth and eyes. The presence of functional autoantibodies against muscarinic type 3 receptor (M3R) has been reported in pSS patients. However, the pathological role of anti-M3R autoantibodies in pSS salivary dysfunction remains controversial | ||
| 520 | |a METHODS: Purified IgGs were obtained from normal (control) and primary SS patients' sera (pSS IgG). Internalization of M3R and clathrin was analyzed by biochemical assay and immunofluorescence confocal microscopy using human submandibular gland (hSMG) cells. Cytoplasmic free Ca(2+) concentration ([Ca(2+)](i)) was measured by microspectrofluorimetry | ||
| 520 | |a RESULTS: Incubation of hSMG cells with pSS IgG (1mg/ml) significantly decreased M3R expression levels at the membrane. Carbachol-induced [Ca(2+)](i) transients (CICTs) in these cells were also inhibited by pSS IgG. In contrast to pSS IgG, control IgG had no effect on both the M3R expression level and CICTs. We found that binding of pSS IgG to M3R induces phosphorylation of the receptor, and that the pSS IgG-induced M3R internalization is prevented by the lysosomal inhibitor, chloroquine. In addition, pSS IgG decreased membrane clathrin expression, which was inhibited by atropine. Our immunofluorescence study further confirmed that pSS IgG induces a co-localization of M3R with clathrin and subsequent internalization of M3R | ||
| 520 | |a CONCLUSION: pSS IgG induces internalization of M3R partly through a clathrin-mediated pathway. The results suggest M3R internalization as a potential mechanism to explain the exocrinopathy seen in pSS patients | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 7 | |a Autoantibodies |2 NLM | |
| 650 | 7 | |a Clathrin |2 NLM | |
| 650 | 7 | |a Immunoglobulin G |2 NLM | |
| 650 | 7 | |a Receptor, Muscarinic M3 |2 NLM | |
| 650 | 7 | |a Chloroquine |2 NLM | |
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| 700 | 1 | |a Hwang, Sung-Min |e verfasserin |4 aut | |
| 700 | 1 | |a Davies, Alexander J |e verfasserin |4 aut | |
| 700 | 1 | |a Shin, Yonghwan |e verfasserin |4 aut | |
| 700 | 1 | |a Bae, Jun-Seok |e verfasserin |4 aut | |
| 700 | 1 | |a Lee, Jong-Ho |e verfasserin |4 aut | |
| 700 | 1 | |a Lee, Eun Bong |e verfasserin |4 aut | |
| 700 | 1 | |a Song, Yeong Wook |e verfasserin |4 aut | |
| 700 | 1 | |a Park, Kyungpyo |e verfasserin |4 aut | |
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