Abstract
Ankylosing spondylitis (AS) is a chronic inflammatory arthritis of unknown origin. Its autoimmune origin has been suggested but never proven. Several reports have implicated Klebsiella pneumoniae as a triggering or perpetuating factor in AS; however, its role in the disease pathogenesis remains debated. Moreover, despite extensive investigations, a biomarker for AS has not yet been identified. To clarify these issues, we screened a random peptide library with pooled IgGs obtained from 40 patients with AS. A peptide (AS peptide) selected from the library was recognized by serum IgGs from 170 of 200 (85%) patients with AS but not by serum specimens from 100 healthy controls. Interestingly, the AS peptide shows a sequence similarity with several molecules expressed at the fibrocartilaginous sites that are primarily involved in the AS inflammatory process. Moreover, the peptide is highly homologous to a Klebsiella pneumoniae dipeptidase (DPP) protein. The antibody affinity purified against the AS peptide recognizes the autoantigens and the DPP protein. Furthermore, serum IgG antibodies against the Klebsiella DPP121-145 peptide epitope were detected in 190 of 200 patients with AS (95%), 3 of 200 patients with rheumatoid arthritis (1.5%) and only 1 of 100 (1%) patients with psoriatic arthritis. Such reactivity was not detected in healthy control donors. Our results show that antibodies directed against an epitope of a Klebsiella pneumoniae-derived protein are present in nearly all patients with AS. In the absence of serological biomarkers for AS, such antibodies may represent a useful tool in the diagnosis of the disease.
| Original language | English |
|---|---|
| Pages (from-to) | e0171073 |
| Journal | PLoS One |
| Volume | 12 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2017 |
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Keywords
- Amino Acid Sequence
- Antibodies, Bacterial/blood
- Autoantigens/immunology
- Bacterial Proteins/chemistry
- Epitopes/immunology
- Female
- Humans
- Inflammation/blood
- Klebsiella pneumoniae/immunology
- Male
- Middle Aged
- Peptide Library
- Peptides/chemistry
- Sequence Homology, Amino Acid
- Spondylitis, Ankylosing/blood
Cite this
Antibodies Directed against a Peptide Epitope of a Klebsiella pneumoniae-Derived Protein Are Present in Ankylosing Spondylitis. / Puccetti, Antonio; Dolcino, Marzia; Tinazzi, Elisa; Moretta, Francesca; D'Angelo, Salvatore; Olivieri, Ignazio; Lunardi, Claudio.
In: PLoS One, Vol. 12, No. 1, 2017, p. e0171073.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Antibodies Directed against a Peptide Epitope of a Klebsiella pneumoniae-Derived Protein Are Present in Ankylosing Spondylitis
AU - Puccetti, Antonio
AU - Dolcino, Marzia
AU - Tinazzi, Elisa
AU - Moretta, Francesca
AU - D'Angelo, Salvatore
AU - Olivieri, Ignazio
AU - Lunardi, Claudio
PY - 2017
Y1 - 2017
N2 - Ankylosing spondylitis (AS) is a chronic inflammatory arthritis of unknown origin. Its autoimmune origin has been suggested but never proven. Several reports have implicated Klebsiella pneumoniae as a triggering or perpetuating factor in AS; however, its role in the disease pathogenesis remains debated. Moreover, despite extensive investigations, a biomarker for AS has not yet been identified. To clarify these issues, we screened a random peptide library with pooled IgGs obtained from 40 patients with AS. A peptide (AS peptide) selected from the library was recognized by serum IgGs from 170 of 200 (85%) patients with AS but not by serum specimens from 100 healthy controls. Interestingly, the AS peptide shows a sequence similarity with several molecules expressed at the fibrocartilaginous sites that are primarily involved in the AS inflammatory process. Moreover, the peptide is highly homologous to a Klebsiella pneumoniae dipeptidase (DPP) protein. The antibody affinity purified against the AS peptide recognizes the autoantigens and the DPP protein. Furthermore, serum IgG antibodies against the Klebsiella DPP121-145 peptide epitope were detected in 190 of 200 patients with AS (95%), 3 of 200 patients with rheumatoid arthritis (1.5%) and only 1 of 100 (1%) patients with psoriatic arthritis. Such reactivity was not detected in healthy control donors. Our results show that antibodies directed against an epitope of a Klebsiella pneumoniae-derived protein are present in nearly all patients with AS. In the absence of serological biomarkers for AS, such antibodies may represent a useful tool in the diagnosis of the disease.
AB - Ankylosing spondylitis (AS) is a chronic inflammatory arthritis of unknown origin. Its autoimmune origin has been suggested but never proven. Several reports have implicated Klebsiella pneumoniae as a triggering or perpetuating factor in AS; however, its role in the disease pathogenesis remains debated. Moreover, despite extensive investigations, a biomarker for AS has not yet been identified. To clarify these issues, we screened a random peptide library with pooled IgGs obtained from 40 patients with AS. A peptide (AS peptide) selected from the library was recognized by serum IgGs from 170 of 200 (85%) patients with AS but not by serum specimens from 100 healthy controls. Interestingly, the AS peptide shows a sequence similarity with several molecules expressed at the fibrocartilaginous sites that are primarily involved in the AS inflammatory process. Moreover, the peptide is highly homologous to a Klebsiella pneumoniae dipeptidase (DPP) protein. The antibody affinity purified against the AS peptide recognizes the autoantigens and the DPP protein. Furthermore, serum IgG antibodies against the Klebsiella DPP121-145 peptide epitope were detected in 190 of 200 patients with AS (95%), 3 of 200 patients with rheumatoid arthritis (1.5%) and only 1 of 100 (1%) patients with psoriatic arthritis. Such reactivity was not detected in healthy control donors. Our results show that antibodies directed against an epitope of a Klebsiella pneumoniae-derived protein are present in nearly all patients with AS. In the absence of serological biomarkers for AS, such antibodies may represent a useful tool in the diagnosis of the disease.
KW - Amino Acid Sequence
KW - Antibodies, Bacterial/blood
KW - Autoantigens/immunology
KW - Bacterial Proteins/chemistry
KW - Epitopes/immunology
KW - Female
KW - Humans
KW - Inflammation/blood
KW - Klebsiella pneumoniae/immunology
KW - Male
KW - Middle Aged
KW - Peptide Library
KW - Peptides/chemistry
KW - Sequence Homology, Amino Acid
KW - Spondylitis, Ankylosing/blood
U2 - 10.1371/journal.pone.0171073
DO - 10.1371/journal.pone.0171073
M3 - Article
VL - 12
SP - e0171073
JO - PLoS One
JF - PLoS One
SN - 1932-6203
IS - 1
ER -