Dataset Information

Hs_Placenta

ABSTRACT: Hs_Placenta

REANALYSIS of: PXD000865

INSTRUMENT(S): LTQ Orbitrap Elite

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Others

SUBMITTER: Wilhelm et al.

PROVIDER: PAe005066 | PeptideAtlas | 2014-12-31

REPOSITORIES: PeptideAtlas

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Publications

Mass-spectrometry-based draft of the human proteome.

Wilhelm Mathias M Schlegl Judith J Hahne Hannes H Gholami Amin Moghaddas AM Lieberenz Marcus M Savitski Mikhail M MM Ziegler Emanuel E Butzmann Lars L Gessulat Siegfried S Marx Harald H Mathieson Toby T Lemeer Simone S Schnatbaum Karsten K Reimer Ulf U Wenschuh Holger H Mollenhauer Martin M Slotta-Huspenina Julia J Boese Joos-Hendrik JH Bantscheff Marcus M Gerstmair Anja A Faerber Franz F Kuster Bernhard B

Nature 20140501 7502

Proteomes are characterized by large protein-abundance differences, cell-type- and time-dependent expression patterns and post-translational modifications, all of which carry biological information that is not accessible by genomics or transcriptomics. Here we present a mass-spectrometry-based draft of the human proteome and a public, high-performance, in-memory database for real-time analysis of terabytes of big data, called ProteomicsDB. The information assembled from human tissues, cell lines ...[more]

PMID: 24870543

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Project description:Systemic lupus erythematosus is a chronic autoimmune disease with multifactorial ethiopathogenesis. The complement system is involved in both the early and late stages of disease development and organ damage. To better understand autoantibody mediated complement consumption the GAPAID consortium examined ex vivo immune complex formation on autoantigen arrays. We recruited patients with SLE (n=211), with other systemic autoimmune diseases (n=65) and non-autoimmune control subjects (n=149) in two rheumatology tertiary care centers. Standard clinical and laboratory data were collected from all subjects and serum complement levels were determined in SLE patients. The genotype of SNP rs1143679 in the ITGAM gene was also determined. On-chip formation of immune complexes was examined using a functional immunoassay on autoantigen microarray. The amount of antigen-bound IgM, IgG and complement C4 and C3 was quantified on autoantigens comprising nucleic acids, proteins and lipids. Our results show that the relatively high complement consumption of nucleic acids is further increased upon binding of IgM and IgG. This is true even when serum complement levels are decreased due to complement consumption in SLE patients. A negative correlation between serum complement levels and ex vivo complement deposition on nucleic acid autoantigens is demonstrated. On the contrary, most protein and lipid autoantigens show positive correlation with C4 and C3 levels. Genetic analysis reveals that the non-synonymous variant rs1143679 in complement receptor type 3 is associated with an increased production of anti-dsDNA IgG antibodies. Notwithstanding, homozygous carriers of the previously reported susceptible allele (AA) have lower levels of dsDNA specific IgM among SLE patients. Regarding organ involvement we find that besides anti-C1q IgG, low levels of dsDNA specific IgM and low complement C4 binding to C1q are also associated with renal injury. In summary, nucleic acids maintain a skewed complement deposition balance when bound by IgG and IgM, depleting the early classical complement pathway from other physiological processes. Dysfunction of the receptor responsible for complement-mediated apoptotic debris removal promotes the development of autoantibodies targeting nucleic acids. These observations provide serological and genetic evidence for complement-mediated clearance deficiency of apoptotic debris in lupus.

Dataset Information

Hs_Placenta

Publications

Mass-spectrometry-based draft of the human proteome.

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