Int J Stem Cells.  2025 Feb;18(1):59-71. doi.org/10.15283/ijsc24097.

The Effect of Nerve Growth Factor on Cartilage Fibrosis and Hypertrophy during In Vitro Chondrogenesis Using Induced Pluripotent Stem Cells

Affiliations
  • 1Catholic iPSCs Research Center, CiSTEM Laboratory, Department of Medical Sciences, Graduate School The Catholic University of Korea, Seoul, Korea
  • 2Department of Medical Sciences, Graduate School of The Catholic University of Korea, Seoul, Korea
  • 3Division of Rheumatology, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea

Abstract

Nerve growth factor (NGF) is a neurotrophic factor usually involved in the survival, differentiation, and growth of sensory neurons and nociceptive function. Yet, it has been suggested to play a role in the pathogenesis of osteoarthritis (OA). Previous studies suggested a possible relationship between NGF and OA; however, the underlying mechanisms remain unknown. Therefore, we investigated the impact of NGF in chondrogenesis using human induced pluripotent stem cells (hiPSCs)-derived chondrogenic pellets. To investigate how NGF affects the cartilage tissue, hiPSC-derived chondrogenic pellets were treated with NGF on day 3 of differentiation, expression of chondrogenic, hypertrophic, and fibrotic markers was confirmed. Also, inflammatory cytokine arrays were performed using the culture medium of the NGF treated chondrogenic pellets. As a result, NGF treatment decreased the expression of pro-chondrogenic markers by approximately 2∼4 times, and hypertrophic (pro-osteogenic) markers and fibrotic markers were increased by approximately 3-fold or more in the NGF-treated cartilaginous pellets. In addition, angiogenesis was upregulated by approximately 4-fold or more, bone formation by more than 2-fold, and matrix metalloproteinase induction by more than 2-fold. These inflammatory cytokine array were using the NGF-treated chondrogenic pellet cultured medium. Furthermore, it was confirmed by Western blot to be related to the induction of the glycogen synthase kinase-3 beta (GSK3β) pathway by NGF. In Conclusions, these findings provide valuable insights into the multifaceted role of NGF in cartilage hypertrophy and fibrosis, which might play a critical role in OA progression.

Keyword

Nerve growth factor; Induced pluripotent stem cells; Chondrogenesis; Hypertrophy; Chondrocalcinosis; Osteoarthritis

Figure

  • Fig. 1 Nerve growth factor (NGF) expression in osteoarthritis (OA) cartilage tissues and chondrogenic pellets treated with synovial fluid (SF) of OA patients. (A) Immunofluorescence staining was performed to determine NGF expression in the cartilage tissues of patients (n=3). It was confirmed that the damaged area is different in the same patient's articular cartilage tissue, and the less damaged area is shown in the left panel, and the severely damaged area is shown in the lower panel. Scale bar=40 μm. (B) Schematic of treatment of chondrogenic pellets with human SF (n=3). (C) Morphology of induced pluripotent stem cells (iPSCs), embryoid bodies (EBs), outgrowth cells (OGCs), and chondrogenic pellets during differentiation. Scale bar=100 μm. Images of EBs and OGCs are shown at 100 μm magnification. (D) Images of normal and OA-SF-treated pellets. (E) Relative gene expression of NGF and NTRK1 in normal group and SF-treated pellets. (F) Protein levels of NGF and TrkA confirmed through western blot analysis using pellet extracts. (G) Quantitative analysis of band intensity using western blotting. (H) NGF and TrkA expression determined via immunofluorescence (IFA) staining in OA-SF-treated pellets on days 7. (I) Quantitative measurements of IFA staining area by ImageJ software (National Institutes of Health). Scale bar=200 μm magnification. Expression of proteins was normalized to that of GAPDH. Statistical analysis was performed using the t-test (*p<0.05, **p<0.01) and Mann–Whitney U-test (#p<0.05). Data are represented as mean±SEM. NC: normal control.

  • Fig. 2 Characterization of nerve growth factor (NGF)-treated chondrogenic pellets at day 7 and 14. (A) Scheme of chondrogenic differentiation with NGF treatment. (B) Pellets morphology of normal control (NC) and NGF treated group. (C) Relative mRNA levels of NGF and NTRK1 in pellets. (D, E) Western blot image and quantitative evaluation of NGF and TrkA in normal and NGF-treated pellets. (F) Relative gene expression of chondrogenic markers SOX9, ACAN, and COL2A1 on days 7 and 14 along with COL10A1, VEGFA, and MMP13 as hypertrophic markers. Statistical analysis using t-test (*p<0.05, **p<0.01, ***p<0.001) and Mann–Whitney U-test (#p<0.05, ##p<0.01, ###p<0.001) are represented as mean±SEM. Gene expression was normalized to that of GAPDH. (G) Pellet images after Toluidine blue staining, Safranin O staining and Alcian blue staining. (H, I) Pellets images after immunohistological staining of Collagen Type II and Collagen Type X. Scale bar=200 μm magnification. hiPSCs: human induced pluripotent stem cells, EB: embryoid body, OG: outgrowth.

  • Fig. 3 Inflammatory cytokine expression in nerve growth factor (NGF)-treated chondrogenic pellet culture medium. (A) Cytokine array results showing the most altered expression of markers related to (B) angiogenesis (angiogenin, RBP-4, VCAM-1), (C) osteogenesis (IGFBP-2, IGFBP-3, IP-10, HGF), (D) MMP induction (MIF, EMMRPIN), and (E) Osteopontin (OPN), which has showed a highly significant reduction. NC: normal control. *p<0.05, **p<0.01, ***p<0.001.

  • Fig. 4 Induction of cartilage hypertrophy and fibrosis by nerve growth factor (NGF) treatment in chondrogenic pellets. (A) Relative gene expression of hypertrophy markers, ALP, OCN, and RUNX2. (B) Relative gene expression of fibrosis markers, COL1A1, COL3A1, and α-SMA. (C) The protein expression levels of alkaline phosphatase (ALP), RUNX2, Collagen Type III (COL3), and α-SMA. (D) Quantitative evaluation of Western blot. (E) Alizarin red S and Von Kossa staining images of normal control (NC) and NGF-treated pellets. Scale bar=100 μm magnification. (F) Protein expression of fibrotic marker Collagen Type I and hypertrophic marker osteocalcin in NGF-treated pellets on day 14 and (G) quantitative evaluation. Image scale bar=200 μm magnification. Statistical significance is shown as t-test (*p<0.05, **p<0.01, ***p<0.001) and Mann–Whitney U-test (#p<0.05, ##p<0.01, ###p<0.001). (H) Western blot image of GSK3β and p-GSK3β. (I) Quantitative analysis of the western blot image of GSK3β and p-GSK3β.


Reference

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