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Human leukocyte antigen-specific antibodies and gamma-interferon stimulate human microvascular and glomerular endothelial cells to produce complement factor C4

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Hamer, Rizwan, Molostvov, Guerman, Lowe, David Philip, Satchell, Simon, Mathieson, Peter, Ilyas, Rebecca, Mitchell, Daniel A., Lam, For T., Kashi, Habib, Tan, Lam Chin, Imray, C. (Chris), Fletcher, Simon, Briggs, David, Krishnan, Nithya, Higgins, Rob and Zehnder, Daniel (2012) Human leukocyte antigen-specific antibodies and gamma-interferon stimulate human microvascular and glomerular endothelial cells to produce complement factor C4. Transplantation, Vol.93 (No.9). pp. 867-873. doi:10.1097/TP.0b013e31824b3762 ISSN 0041-1337.

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Official URL: http://dx.doi.org/10.1097/TP.0b013e31824b3762

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Abstract

Background: The role of the complement system in antibody-mediated rejection has been investigated in relation to circulating complement interacting with renal microvascular endothelium, resulting in the formation of peritubular capillary C4d. However, the possible importance of local complement synthesis is less clear. The aim of this study was to determine whether human vascular endothelium could produce C4 in response to stimulation in vitro. METHODS: Human microvascular endothelial cells and glomerular endothelial cells were stimulated with endotoxins, cytokines, and human leukocyte antigen-specific antibodies. Synthesis of complement was investigated using western blotting and indirect immunofluorescence. De novo C4 synthesis was confirmed by using C4 small interfering RNA. RESULTS: Glomerular and microvascular endothelium, both produce C3 and C4 complement protein. Complement synthesis was stimulant-specific-C3 was produced mainly after stimulation with lipopolysaccharide whereas C4 synthesis occurred on treatment with gamma interferon. Culture with human leukocyte antigen-specific antibodies resulted in a significant increase of C4 protein synthesis by both cell lines. CONCLUSIONS: We have shown for the first time that human microvascular endothelium can be stimulated to synthesize C4 in vitro. The implications of this for clinical transplantation, especially in the context of antibody-mediated rejection, its histological interpretation and as a potential target for therapy would have to be determined by further studies. © 2012 Lippincott Williams & Wilkins.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School
Journal or Publication Title: Transplantation
Publisher: Lippincott Williams & Wilkins
ISSN: 0041-1337
Official Date: 15 May 2012
Dates:
DateEvent
15 May 2012Published
Volume: Vol.93
Number: No.9
Page Range: pp. 867-873
DOI: 10.1097/TP.0b013e31824b3762
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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