Abstract
Rationale: Surfactant protein D (SP-D), a 43-kD collectin, is synthesized and secreted by airway epithelia as a dodecamer formed by assembly of four trimeric subunits. We have previously shown that the quaternary structure of SP-D can be altered during inflammatory lung injury through its modification by S-nitrosylation, which in turn alters its functional behavior producing a proinflammatory response in effector cells. Objectives: We hypothesized that alterations in structure and function of SP-D may occur in humans with acute allergic inflammation. Methods: Bronchoalveolar lavage (BAL) fluid was collected from 15 nonsmoking patients with mild intermittent allergic asthma before and 24 hours after segmental provocation with saline, allergen, LPS, and mixtures of allergen and LPS. Structural modifications of SP-D were analyzed by native and sodium dodecyl sulfate gel electrophoresis. Measurements and Main Results: The multimeric structure of native SP-D was found to be disrupted after provocation with allergen or a mixture of allergen and LPS. Interestingly, under reducing conditions, sodium dodecyl sulfate-polyacrylamide gel electrophoresis demonstrated that 7 of 15 patients with asthma developed an abnormal cross-linked SP-D band after segmental challenge with either allergen or a mixture of allergen with LPS but not LPS alone. Importantly, patients with asthma with cross-linked SP-D demonstrated significantly higher levels of BAL eosinophils, nitrogen oxides, IL-4, IL-5, IL-13, and S-nitrosothiol-SP-D compared with patients without cross-linked SP-D. Conclusions:We conclude that segmental allergen challenge results in changes of SP-D multimeric structure and that these modifications are associated with an altered local inflammatory response in the distal airways.
| Original language | English |
|---|---|
| Pages (from-to) | 856-864 |
| Number of pages | 9 |
| Journal | American Journal of Respiratory and Critical Care Medicine |
| Volume | 183 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 1 Apr 2011 |
| Externally published | Yes |
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Keywords
- Biomarker
- Human asthma
- Nitric oxide
- Pulmonary collectins
- Surfactant proteins
ASJC Scopus subject areas
- Pulmonary and Respiratory Medicine
- Critical Care and Intensive Care Medicine
Cite this
Segmental allergen challenge alters multimeric structure and function of surfactant protein D in humans. / Atochina-Vasserman, Elena N.; Winkler, Carla; Abramova, Helen; Schaumann, Frank; Krug, Norbert; Gow, Andrew J.; Beers, Michael F.; Hohlfeld, Jens M.
In: American Journal of Respiratory and Critical Care Medicine, Vol. 183, No. 7, 01.04.2011, p. 856-864.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Segmental allergen challenge alters multimeric structure and function of surfactant protein D in humans
AU - Atochina-Vasserman, Elena N.
AU - Winkler, Carla
AU - Abramova, Helen
AU - Schaumann, Frank
AU - Krug, Norbert
AU - Gow, Andrew J.
AU - Beers, Michael F.
AU - Hohlfeld, Jens M.
PY - 2011/4/1
Y1 - 2011/4/1
N2 - Rationale: Surfactant protein D (SP-D), a 43-kD collectin, is synthesized and secreted by airway epithelia as a dodecamer formed by assembly of four trimeric subunits. We have previously shown that the quaternary structure of SP-D can be altered during inflammatory lung injury through its modification by S-nitrosylation, which in turn alters its functional behavior producing a proinflammatory response in effector cells. Objectives: We hypothesized that alterations in structure and function of SP-D may occur in humans with acute allergic inflammation. Methods: Bronchoalveolar lavage (BAL) fluid was collected from 15 nonsmoking patients with mild intermittent allergic asthma before and 24 hours after segmental provocation with saline, allergen, LPS, and mixtures of allergen and LPS. Structural modifications of SP-D were analyzed by native and sodium dodecyl sulfate gel electrophoresis. Measurements and Main Results: The multimeric structure of native SP-D was found to be disrupted after provocation with allergen or a mixture of allergen and LPS. Interestingly, under reducing conditions, sodium dodecyl sulfate-polyacrylamide gel electrophoresis demonstrated that 7 of 15 patients with asthma developed an abnormal cross-linked SP-D band after segmental challenge with either allergen or a mixture of allergen with LPS but not LPS alone. Importantly, patients with asthma with cross-linked SP-D demonstrated significantly higher levels of BAL eosinophils, nitrogen oxides, IL-4, IL-5, IL-13, and S-nitrosothiol-SP-D compared with patients without cross-linked SP-D. Conclusions:We conclude that segmental allergen challenge results in changes of SP-D multimeric structure and that these modifications are associated with an altered local inflammatory response in the distal airways.
AB - Rationale: Surfactant protein D (SP-D), a 43-kD collectin, is synthesized and secreted by airway epithelia as a dodecamer formed by assembly of four trimeric subunits. We have previously shown that the quaternary structure of SP-D can be altered during inflammatory lung injury through its modification by S-nitrosylation, which in turn alters its functional behavior producing a proinflammatory response in effector cells. Objectives: We hypothesized that alterations in structure and function of SP-D may occur in humans with acute allergic inflammation. Methods: Bronchoalveolar lavage (BAL) fluid was collected from 15 nonsmoking patients with mild intermittent allergic asthma before and 24 hours after segmental provocation with saline, allergen, LPS, and mixtures of allergen and LPS. Structural modifications of SP-D were analyzed by native and sodium dodecyl sulfate gel electrophoresis. Measurements and Main Results: The multimeric structure of native SP-D was found to be disrupted after provocation with allergen or a mixture of allergen and LPS. Interestingly, under reducing conditions, sodium dodecyl sulfate-polyacrylamide gel electrophoresis demonstrated that 7 of 15 patients with asthma developed an abnormal cross-linked SP-D band after segmental challenge with either allergen or a mixture of allergen with LPS but not LPS alone. Importantly, patients with asthma with cross-linked SP-D demonstrated significantly higher levels of BAL eosinophils, nitrogen oxides, IL-4, IL-5, IL-13, and S-nitrosothiol-SP-D compared with patients without cross-linked SP-D. Conclusions:We conclude that segmental allergen challenge results in changes of SP-D multimeric structure and that these modifications are associated with an altered local inflammatory response in the distal airways.
KW - Biomarker
KW - Human asthma
KW - Nitric oxide
KW - Pulmonary collectins
KW - Surfactant proteins
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U2 - 10.1164/rccm.201004-0654OC
DO - 10.1164/rccm.201004-0654OC
M3 - Article
VL - 183
SP - 856
EP - 864
JO - American Journal of Respiratory and Critical Care Medicine
JF - American Journal of Respiratory and Critical Care Medicine
SN - 1073-449X
IS - 7
ER -