Initial In Vitro Development of a Potassium-Based Intra-Articular Injection for Osteoarthritis

Tissue Eng Part A. 2018 Sep;24(17-18):1390-1392. doi: 10.1089/ten.TEA.2017.0390. Epub 2018 Jun 4.


The long-term goal of this work is to develop a potassium (K+)-based intra-articular (IA) injection for osteoarthritis treatment. Within this context, the objectives of this study were to (1) demonstrate that hyperosmolar K+ solutions can suppress proinflammatory macrophage activation and (2) evaluate the therapeutic potential of a hyperosmolar K+ solution relative to a clinically utilized drug-based (methylprednisolone acetate [MPA]-a corticosteroid) or cell-based (human mesenchymal stem cell [hMSC]) IA injectable. A 3D in vitro model with poly(ethylene glycol) diacrylate hydrogels encapsulated with proinflammatory interferon-gamma (IFN)-stimulated macrophages (M(IFN)s) was utilized. Long-term changes in cell phenotype in response to short-term stimulation (i.e., mimicking an IA injection) were assessed following treatment with 80 mM K+ gluconate, hMSCs, or MPA. Addition of 80 mM K+ gluconate to culture media significantly reduced iNOS and TNF protein levels in M(IFN)s. Furthermore, short-term stimulation with K+ gluconate elicited a significant increase in the anti/proinflammatory cytokine profile in M(IFN)s, a response that is not noticed with either clinically utilized MPA or an hMSC injectable. Hyperosmolar K+ solutions are capable of attenuating proinflammatory macrophage activation. Moreover, when evaluated in an in vitro setting mimicking an IA injection, K+ performed significantly better than hMSCs or the corticosteroid MPA. Cumulatively, these results support further development and application of a K+-based IA injection toward osteoarthritis research.

Keywords: intra-articular injection; macrophage activation; osteoarthritis; potassium.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Cells, Immobilized* / metabolism
  • Cells, Immobilized* / pathology
  • Cells, Immobilized* / transplantation
  • Gluconates / pharmacology
  • Humans
  • Macrophage Activation
  • Macrophages* / metabolism
  • Macrophages* / pathology
  • Macrophages* / transplantation
  • Mesenchymal Stem Cell Transplantation*
  • Mesenchymal Stem Cells* / metabolism
  • Mesenchymal Stem Cells* / pathology
  • Methylprednisolone / pharmacology
  • Models, Biological*
  • Osteoarthritis* / metabolism
  • Osteoarthritis* / pathology
  • Osteoarthritis* / therapy
  • Potassium / pharmacology*


  • Gluconates
  • Potassium
  • Methylprednisolone