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  • Title: Prolactin has a pathogenic role in systemic lupus erythematosus.
    Author: Jara LJ, Medina G, Saavedra MA, Vera-Lastra O, Torres-Aguilar H, Navarro C, Vazquez Del Mercado M, Espinoza LR.
    Journal: Immunol Res; 2017 Apr; 65(2):512-523. PubMed ID: 28130617.
    Abstract:
    Prolactin, a 23-kDa peptide hormone, is produced by the anterior pituitary gland and extrapituitary sites including the immune cells. Prolactin (PRL) participates in innate and adaptive immune response. PRL stimulates the immune cells by binding to receptor (PRL-R). Binding of PRL to its receptor activates the Janus kinase-signal transducer (JAK-STAT). Activation of these cascades results in endpoints such as immunoestimulator and immunosupressor action. Prolactin belongs to the network of immune-neuroendocrine interaction. Hyperprolactinemia has been found in patients with systemic lupus erythematosus (SLE), and new evidence has confirmed a significant correlation between serum PRL levels and disease activity. PRL participates in activation of SLE during pregnancy and in pathogenesis of lupus nephritis, neuropsychiatric, serosal, hematologic, articular, and cutaneous involvement. Hyperprolactinemia was associated with increase IgG concentrations, anti-DNA antibodies, immune complex, glomerulonephritis, and accelerated mortality in murine lupus. Bromocriptine, a dopamine analog that suppresses PRL secretion, was associated with decreased lupus activity, prolonged lifespan, and restoration of immune competence in experimental model. In clinical trials, bromocriptine and derivative drugs showed beneficial therapeutic effect in treating human lupus, including pregnancy. Taken together, clinical and experimental results leave little doubt that PRL indeed contributes to the pathogenesis and clinical expression of SLE.
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