Prothymosin Alpha: A Novel Contributor to Estradiol Receptor Alpha–Mediated CD8+ T-Cell Pathogenic Responses and Recognition of Type 1 Collagen in Rheumatic Heart Valve Disease

Rheumatic heart valve disease (RHVD) is a leading cause of cardiovascular death in low- and middle-income countries and affects predominantly women. The underlying mechanisms of chronic valvular damage remain unexplored and regulators of sex predisposition are unknown. Proteomics analysis of human h...

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Published in:Circulation (New York, N.Y.) Vol. 145; no. 7; pp. 531 - 548
Main Authors: Passos, Livia S.A., Jha, Prabhash K., Becker-Greene, Dakota, Blaser, Mark C., Romero, Dayanna, Lupieri, Adrien, Sukhova, Galina K., Libby, Peter, Singh, Sasha A., Dutra, Walderez O., Aikawa, Masanori, Levine, Robert A., Nunes, Maria C.P., Aikawa, Elena
Format: Journal Article
Language:English
Published: United States Lippincott Williams & Wilkins 15-02-2022
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Abstract Rheumatic heart valve disease (RHVD) is a leading cause of cardiovascular death in low- and middle-income countries and affects predominantly women. The underlying mechanisms of chronic valvular damage remain unexplored and regulators of sex predisposition are unknown. Proteomics analysis of human heart valves (nondiseased aortic valves, nondiseased mitral valves [NDMVs], valves from patients with rheumatic aortic valve disease, and valves from patients with rheumatic mitral valve disease; n=30) followed by system biology analysis identified ProTα (prothymosin alpha) as a protein associated with RHVD. Histology, multiparameter flow cytometry, and enzyme-linked immunosorbent assay confirmed the expression of ProTα. In vitro experiments using peripheral mononuclear cells and valvular interstitial cells were performed using multiparameter flow cytometry and quantitative polymerase chain reaction. In silico analysis of the RHVD and proteomes were used to identify mimic epitopes. A comparison of NDMV and nondiseased aortic valve proteomes established the baseline differences between nondiseased aortic and mitral valves. Thirteen unique proteins were enriched in NDMVs. Comparison of NDMVs versus valves from patients with rheumatic mitral valve disease and nondiseased aortic valves versus valves from patients with rheumatic aortic valve disease identified 213 proteins enriched in rheumatic valves. The expression of the 13 NDMV-enriched proteins was evaluated across the 213 proteins enriched in diseased valves, resulting in the discovery of ProTα common to valves from patients with rheumatic mitral valve disease and valves from patients with rheumatic aortic valve disease. ProTα plasma levels were significantly higher in patients with RHVD than in healthy individuals. Immunoreactive ProTα colocalized with CD8 T cells in RHVD. Expression of ProTα and estrogen receptor alpha correlated strongly in circulating CD8 T cells from patients with RHVD. Recombinant ProTα induced expression of the lytic proteins perforin and granzyme B by CD8 T cells as well as higher estrogen receptor alpha expression. In addition, recombinant ProTα increased human leukocyte antigen class I levels in valvular interstitial cells. Treatment of CD8 T cells with specific estrogen receptor alpha antagonist reduced the cytotoxic potential promoted by ProTα. In silico analysis of RHVD and proteomes revealed molecular mimicry between human type 1 collagen epitope and bacterial collagen-like protein, which induced CD8 T-cell activation in vitro. ProTα-dependent CD8 T-cell cytotoxicity was associated with estrogen receptor alpha activity, implicating ProTα as a potential regulator of sex predisposition in RHVD. ProTα facilitated recognition of type 1 collagen mimic epitopes by CD8 T cells, suggesting mechanisms provoking autoimmunity.
AbstractList Rheumatic heart valve disease (RHVD) is a leading cause of cardiovascular death in low- and middle-income countries and affects predominantly women. The underlying mechanisms of chronic valvular damage remain unexplored and regulators of sex predisposition are unknown. Proteomics analysis of human heart valves (nondiseased aortic valves, nondiseased mitral valves [NDMVs], valves from patients with rheumatic aortic valve disease, and valves from patients with rheumatic mitral valve disease; n=30) followed by system biology analysis identified ProTα (prothymosin alpha) as a protein associated with RHVD. Histology, multiparameter flow cytometry, and enzyme-linked immunosorbent assay confirmed the expression of ProTα. In vitro experiments using peripheral mononuclear cells and valvular interstitial cells were performed using multiparameter flow cytometry and quantitative polymerase chain reaction. In silico analysis of the RHVD and proteomes were used to identify mimic epitopes. A comparison of NDMV and nondiseased aortic valve proteomes established the baseline differences between nondiseased aortic and mitral valves. Thirteen unique proteins were enriched in NDMVs. Comparison of NDMVs versus valves from patients with rheumatic mitral valve disease and nondiseased aortic valves versus valves from patients with rheumatic aortic valve disease identified 213 proteins enriched in rheumatic valves. The expression of the 13 NDMV-enriched proteins was evaluated across the 213 proteins enriched in diseased valves, resulting in the discovery of ProTα common to valves from patients with rheumatic mitral valve disease and valves from patients with rheumatic aortic valve disease. ProTα plasma levels were significantly higher in patients with RHVD than in healthy individuals. Immunoreactive ProTα colocalized with CD8 T cells in RHVD. Expression of ProTα and estrogen receptor alpha correlated strongly in circulating CD8 T cells from patients with RHVD. Recombinant ProTα induced expression of the lytic proteins perforin and granzyme B by CD8 T cells as well as higher estrogen receptor alpha expression. In addition, recombinant ProTα increased human leukocyte antigen class I levels in valvular interstitial cells. Treatment of CD8 T cells with specific estrogen receptor alpha antagonist reduced the cytotoxic potential promoted by ProTα. In silico analysis of RHVD and proteomes revealed molecular mimicry between human type 1 collagen epitope and bacterial collagen-like protein, which induced CD8 T-cell activation in vitro. ProTα-dependent CD8 T-cell cytotoxicity was associated with estrogen receptor alpha activity, implicating ProTα as a potential regulator of sex predisposition in RHVD. ProTα facilitated recognition of type 1 collagen mimic epitopes by CD8 T cells, suggesting mechanisms provoking autoimmunity.
BACKGROUNDRheumatic heart valve disease (RHVD) is a leading cause of cardiovascular death in low- and middle-income countries and affects predominantly women. The underlying mechanisms of chronic valvular damage remain unexplored and regulators of sex predisposition are unknown. METHODSProteomics analysis of human heart valves (nondiseased aortic valves, nondiseased mitral valves [NDMVs], valves from patients with rheumatic aortic valve disease, and valves from patients with rheumatic mitral valve disease; n=30) followed by system biology analysis identified ProTα (prothymosin alpha) as a protein associated with RHVD. Histology, multiparameter flow cytometry, and enzyme-linked immunosorbent assay confirmed the expression of ProTα. In vitro experiments using peripheral mononuclear cells and valvular interstitial cells were performed using multiparameter flow cytometry and quantitative polymerase chain reaction. In silico analysis of the RHVD and Streptococcuspyogenes proteomes were used to identify mimic epitopes. RESULTSA comparison of NDMV and nondiseased aortic valve proteomes established the baseline differences between nondiseased aortic and mitral valves. Thirteen unique proteins were enriched in NDMVs. Comparison of NDMVs versus valves from patients with rheumatic mitral valve disease and nondiseased aortic valves versus valves from patients with rheumatic aortic valve disease identified 213 proteins enriched in rheumatic valves. The expression of the 13 NDMV-enriched proteins was evaluated across the 213 proteins enriched in diseased valves, resulting in the discovery of ProTα common to valves from patients with rheumatic mitral valve disease and valves from patients with rheumatic aortic valve disease. ProTα plasma levels were significantly higher in patients with RHVD than in healthy individuals. Immunoreactive ProTα colocalized with CD8+ T cells in RHVD. Expression of ProTα and estrogen receptor alpha correlated strongly in circulating CD8+ T cells from patients with RHVD. Recombinant ProTα induced expression of the lytic proteins perforin and granzyme B by CD8+ T cells as well as higher estrogen receptor alpha expression. In addition, recombinant ProTα increased human leukocyte antigen class I levels in valvular interstitial cells. Treatment of CD8+ T cells with specific estrogen receptor alpha antagonist reduced the cytotoxic potential promoted by ProTα. In silico analysis of RHVD and Spyogenes proteomes revealed molecular mimicry between human type 1 collagen epitope and bacterial collagen-like protein, which induced CD8+ T-cell activation in vitro. CONCLUSIONSProTα-dependent CD8+ T-cell cytotoxicity was associated with estrogen receptor alpha activity, implicating ProTα as a potential regulator of sex predisposition in RHVD. ProTα facilitated recognition of type 1 collagen mimic epitopes by CD8+ T cells, suggesting mechanisms provoking autoimmunity.
Author Becker-Greene, Dakota
Singh, Sasha A.
Jha, Prabhash K.
Blaser, Mark C.
Dutra, Walderez O.
Nunes, Maria C.P.
Aikawa, Elena
Levine, Robert A.
Sukhova, Galina K.
Libby, Peter
Passos, Livia S.A.
Romero, Dayanna
Lupieri, Adrien
Aikawa, Masanori
AuthorAffiliation Center for Interdisciplinary Cardiovascular Sciences (M.C.B., S.A.S., M.A., E.A.), Division of Cardiovascular Medicine, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
Center for Excellence in Vascular Biology (L.S.A.P., P.K.J., D.B.-G., D.R., A.L., G.K.S., P.L., M.A., E.A.), Division of Cardiovascular Medicine, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
Departamento de Morfologia, Instituto de Ciências Biológicas (W.O.D.), Federal University of Minas Gerais, Belo Horizonte, Brazil
Hospital das Clinicas, School of Medicine (M.C.P.N.), Federal University of Minas Gerais, Belo Horizonte, Brazil
Cardiac Ultrasound Laboratory, Massachusetts General Hospital, Harvard Medical School, Boston (R.A.L.)
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Keywords T-lymphocytes
heart valve diseases
rheumatic diseases
autoimmunity
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Author contributions: Conceptualization, L.S.A.P., and E.A.; Methodology, L.S.A.P., S.A.S., M.C.B., P.K.J., G.S., W.D., M.C.N., M.A. and E.A.; Investigation, L.S.A.P., P.K.J., D.R., A.L., D.B.G. and M.B.; Writing – Original Draft, L.S.A.P; Writing – Review and Editing, E.A., M.A., P.L., S.A.S., R.A.L., M.C.P, W.O.D. and M.C.B.; Funding, E.A. and R.A.L.
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Snippet Rheumatic heart valve disease (RHVD) is a leading cause of cardiovascular death in low- and middle-income countries and affects predominantly women. The...
BACKGROUNDRheumatic heart valve disease (RHVD) is a leading cause of cardiovascular death in low- and middle-income countries and affects predominantly women....
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SubjectTerms Amino Acid Sequence
CD8-Positive T-Lymphocytes - immunology
CD8-Positive T-Lymphocytes - metabolism
Collagen Type I - chemistry
Collagen Type I - metabolism
Computational Biology - methods
Disease Susceptibility
Epitopes, T-Lymphocyte - immunology
Estrogen Receptor alpha - metabolism
Heart Valve Diseases - diagnosis
Heart Valve Diseases - etiology
Heart Valve Diseases - metabolism
Histocompatibility Antigens Class I - chemistry
Histocompatibility Antigens Class I - genetics
Histocompatibility Antigens Class I - immunology
Humans
Leukocytes, Mononuclear - immunology
Leukocytes, Mononuclear - metabolism
Models, Biological
Models, Molecular
Protein Binding
Protein Precursors - chemistry
Protein Precursors - genetics
Protein Precursors - metabolism
Proteome
Proteomics - methods
Rheumatic Heart Disease - diagnosis
Rheumatic Heart Disease - etiology
Rheumatic Heart Disease - metabolism
Structure-Activity Relationship
Thymosin - analogs & derivatives
Thymosin - chemistry
Thymosin - genetics
Thymosin - metabolism
Title Prothymosin Alpha: A Novel Contributor to Estradiol Receptor Alpha–Mediated CD8+ T-Cell Pathogenic Responses and Recognition of Type 1 Collagen in Rheumatic Heart Valve Disease
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