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Flores-Fernández R, Aponte-López A, Suárez-Arriaga MC, Gorocica-Rosete P, Pizaña-Venegas A, Chávez-Sanchéz L, Blanco-Favela F, Fuentes-Pananá EM, Chávez-Rueda AK. Prolactin Rescues Immature B Cells from Apoptosis-Induced BCR-Aggregation through STAT3, Bcl2a1a, Bcl2l2, and Birc5 in Lupus-Prone MRL/lpr Mice. Cells 2021; 10:cells10020316. [PMID: 33557010 PMCID: PMC7913714 DOI: 10.3390/cells10020316] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Revised: 01/23/2021] [Accepted: 01/24/2021] [Indexed: 12/30/2022] Open
Abstract
Self-reactive immature B cells are eliminated through apoptosis by tolerance mechanisms, failing to eliminate these cells results in autoimmune diseases. Prolactin is known to rescue immature B cells from B cell receptor engagement-induced apoptosis in lupus-prone mice. The objective of this study was to characterize in vitro prolactin signaling in immature B cells, using sorting, PCR array, RT-PCR, flow cytometry, and chromatin immunoprecipitation. We found that all B cell maturation stages in bone marrow express the prolactin receptor long isoform, in both wild-type and MRL/lpr mice, but its expression increased only in the immature B cells of the latter, particularly at the onset of lupus. In these cells, activation of the prolactin receptor promoted STAT3 phosphorylation and upregulation of the antiapoptotic Bcl2a1a, Bcl2l2, and Birc5 genes. STAT3 binding to the promoter region of these genes was confirmed through chromatin immunoprecipitation. Furthermore, inhibitors of prolactin signaling and STAT3 activation abolished the prolactin rescue of self-engaged MRL/lpr immature B cells. These results support a mechanism in which prolactin participates in the emergence of lupus through the rescue of self-reactive immature B cell clones from central tolerance clonal deletion through the activation of STAT3 and transcriptional regulation of a complex network of genes related to apoptosis resistance.
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Affiliation(s)
- Rocio Flores-Fernández
- UIM en Inmunologia, Hospital de Pediatría, CMN SIGLO XXI, Instituto Mexicano del Seguro Social, Mexico City 06720, Mexico; (R.F.-F.); (L.C.-S.); (F.B.-F.)
| | - Angélica Aponte-López
- Unidad de Investigación en Virología y Cáncer, Hospital Infantil de Mexico Federico Gómez, Mexico City 06720, Mexico; (A.A.-L.); (M.C.S.-A.)
- Programa de Doctorado en Ciencias Biomédicas, Universidad Nacional Autónoma de Mexico, Mexico City 04510, Mexico
| | - Mayra C. Suárez-Arriaga
- Unidad de Investigación en Virología y Cáncer, Hospital Infantil de Mexico Federico Gómez, Mexico City 06720, Mexico; (A.A.-L.); (M.C.S.-A.)
- Laboratorio de Biotecnología y Bioinformática Genómica, ENCB, Instituto Politécnico Nacional, Mexico City 11340, Mexico
| | - Patricia Gorocica-Rosete
- Departamento de Investigación en Bioquímica, Instituto Nacional de Enfermedades Respiratorias “Ismael Cosió Villegas”, Mexico City 14080, Mexico;
| | - Alberto Pizaña-Venegas
- Unidad de Investigación y Bioterio, Instituto Nacional de Enfermedades Respiratorias “Ismael Cosió Villegas”, Mexico City 14080, Mexico;
| | - Luis Chávez-Sanchéz
- UIM en Inmunologia, Hospital de Pediatría, CMN SIGLO XXI, Instituto Mexicano del Seguro Social, Mexico City 06720, Mexico; (R.F.-F.); (L.C.-S.); (F.B.-F.)
| | - Francico Blanco-Favela
- UIM en Inmunologia, Hospital de Pediatría, CMN SIGLO XXI, Instituto Mexicano del Seguro Social, Mexico City 06720, Mexico; (R.F.-F.); (L.C.-S.); (F.B.-F.)
| | - Ezequiel M. Fuentes-Pananá
- Unidad de Investigación en Virología y Cáncer, Hospital Infantil de Mexico Federico Gómez, Mexico City 06720, Mexico; (A.A.-L.); (M.C.S.-A.)
- Correspondence: or (E.M.F.-P.); or (A.K.C.-R.); Tel.: +52-5544349663 (E.M.F.-P.); +52-555627694 (A.K.C.-R.)
| | - Adriana K. Chávez-Rueda
- UIM en Inmunologia, Hospital de Pediatría, CMN SIGLO XXI, Instituto Mexicano del Seguro Social, Mexico City 06720, Mexico; (R.F.-F.); (L.C.-S.); (F.B.-F.)
- Correspondence: or (E.M.F.-P.); or (A.K.C.-R.); Tel.: +52-5544349663 (E.M.F.-P.); +52-555627694 (A.K.C.-R.)
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