Agonistic analogs of growth hormone releasing hormone (GHRH) promote wound healing by stimulating the proliferation and survival of human dermal fibroblasts through ERK and AKT pathways

Tengjiao Cui, Joaquin J. Jimenez, Norman L. Block, Evangelos V. Badiavas, Luis Rodriguez-Menocal, Ailin Vila Granda, Renzhi Cai, Wei Sha, Marta Zarandi, Roberto Perez, Andrew V. Schally

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Decreased or impaired proliferation capability of dermal fibroblasts interferes with successful wound healing. Several growth factors tested failed to fully restore the growth of fibroblasts, possibly due to their rapid degradation by proteases. It is therefore critical to find new agents which have stimulatory effects on fibroblasts while being highly resistant to degradation. In such a scenario, the activities of two agonistic analogs of growth hormone releasing hormone (GHRH), MR-409 and MR- 502, were evaluated for their impact on proliferation and survival of primary human dermal fibroblasts. In vitro, both analogs significantly stimulated cell growth by more than 50%. Under serum-depletion induced stress, fibroblasts treated with MR-409 or MR-502 demonstrated better survival rates than control. These effects can be inhibited by either PD98059 or wortmannin. Signaling through MEK/ERK1/2 and PI3K/AKT in an IGF-1 receptor-independent manner is required. In vivo, MR-409 promoted wound closure. Animals treated topically with MR-409 healed earlier than controls in a dosedependent manner. Histologic examination revealed better wound contraction and less fibrosis in treated groups. In conclusion, MR-409 is a potent mitogenic and antiapoptotic factor for primary human dermal fibroblasts. Its beneficial effects on wound healing make it a promising agent for future development.

Original languageEnglish (US)
Pages (from-to)52661-52672
Number of pages12
JournalOncotarget
Volume7
Issue number33
DOIs
StatePublished - Aug 1 2016

Keywords

  • AKT pathway
  • ERK pathway
  • GHRH agonists
  • Human dermal fibroblast
  • Pathology Section
  • Wound healing

ASJC Scopus subject areas

  • Oncology

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