An Improved, Chemically Modified RNA Encoding BMP-2 Enhances Osteogenesis In Vitro and In Vivo

Wen Zhang, Rodolfo E De La Vega, Michael J Coenen, Sebastian A Müller, Carlos J Peniche Silva, Manish K Aneja, Christian Plank, Martijn van Griensven, Christopher H Evans, Elizabeth R Balmayor

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The first therapeutic application of messenger RNA (mRNA) was suggested more than two decades ago. However, its application was constrained by the ability of mRNA to activate the innate immune response, cytotoxicity, and poor potency. We and others recently demonstrated that these undesirable properties of mRNA may be overcome by alterating its structure. In this study, we developed a new chemically modified mRNA coding for BMP-2 with improved osteogenic features. To develop this new construct, we removed from the mRNA sequence the following undesirable elements: an upstream open reading frame in the 5-untranslated region (UTR) and a polyadenylation element together with an AU-rich tract in the 3UTR. In addition, a translation initiator of short UTRs (TISU) was introduced together with 5-iodo modified pyrimidine nucleotides. The new TISU BMP-2 chemically modified RNA (cmRNA) showed robust BMP-2 production in vitro in cell lines (HEK293 and MC3T3) and primary cells (muscle-derived mesenchymal stem cells). Stem cells additionally showed upregulation of osteogenic and angiogenic genes as a result of the TISU BMP-2 cmRNA transfection. The in vivo osteogenic properties of TISU BMP-2 cmRNA were explored in a critical-sized femoral defect in the rat. For this, the TISU BMP-2 cmRNA was loaded into collagen sponges to form transcript-activated matrices. Animals treated with TISU BMP-2 cmRNA showed superior bone formation that seemed to recapitulate endochondral ossification. The higher of the two doses examined in this model showed more robust new tissue formation. Finally, improved vascularization was detected in the healing area for animals treated with TISU BMP-2 cmRNA.

Original languageEnglish
Pages (from-to)131-144
Number of pages14
JournalTissue Engineering. Part A
Volume25
Issue number1-2
DOIs
Publication statusPublished - 1 Jan 2019
Externally publishedYes

Keywords

  • Animals
  • Bone Morphogenetic Protein 2/biosynthesis
  • Gene Transfer Techniques
  • HEK293 Cells
  • Humans
  • Male
  • Mesenchymal Stem Cells/cytology
  • Mice
  • Osteogenesis/drug effects
  • RNA, Messenger/genetics
  • Rats
  • Rats, Inbred F344
  • MATRIX
  • STEM-CELLS
  • transcript therapy
  • mRNA
  • BMP-2
  • TRANSLATION
  • DELIVERY
  • MODIFIED MESSENGER-RNA
  • bone healing
  • modified mRNA
  • vascularization
  • DIFFERENTIATION

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