Activity of the growth hormone-releasing hormone antagonist MIA602 and its underlying mechanisms of action in sarcoidosis-like granuloma

Chongxu Zhang, Runxia Tian, Emilee M. Dreifus, Abdolrazagh Hashemi Shahraki, Gregory Holt, Renzhi Cai, Anthony Griswold, Pablo A Bejarano, Robert Jackson, Andrew V Schally, Mehdi Mirsaeidi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Objectives: Growth hormone-releasing hormone (GHRH) is a potent stimulator of growth hormone (GH) secretion from the pituitary gland. Although GHRH is essential for the growth of immune cells, the regulatory effects of its antagonist in granulomatous disease remain unknown. Methods: Here, we report expression of GHRH receptor (R) in human tissue with sarcoidosis granuloma and demonstrate the anti-inflammatory effects of MIA602 (a GHRH antagonist) in two in vitro human granuloma models and an in vivo granuloma model using different methods including ELISA, immunohistochemistry, RNA-seq analysis and flow cytometry. Results: MIA602 decreases the levels of IL-2, IL-2R, IL-7, IL-12, IL-17A and TNF-α in an in vitro granuloma model. Further, we show that the anti-inflammatory effect of MIA602 appears to be mediated by a reduction in CD45+CD68+ cells in granulomatous tissue and upregulation in PD-1 expression in macrophages. Analysis of the expression of proteins involved in the mitochondrial stage of apoptosis showed that MIA602 increases the levels of caspase-3, BCL-xL/BAK dimer and MCl-1/Bak dimer in the granuloma. These findings indicate that MIA602 may not induce apoptosis. Conclusions: Our findings further suggest that GHRH-R is potentially a clinical target for the treatment of granulomatous disease and that MIA602 may be used as a novel therapeutic agent for sarcoidosis.

Original languageEnglish (US)
Article numbere1310
JournalClinical and Translational Immunology
Volume10
Issue number7
DOIs
StatePublished - 2021

Keywords

  • GHRH antagonist
  • granuloma
  • MIA602
  • sarcoidosis

ASJC Scopus subject areas

  • Nursing(all)
  • Immunology and Allergy
  • Immunology

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