Effect of IGF-I in the chondrogenesis of bone marrow mesenchymal stem cells in the presence or absence of TGF-β signaling

Lara Longobardi, Lynda O'Rear, Srikanth Aakula, Brian Johnstone, Kimberly Shimer, Anna Chytil, William A. Horton, Harold L. Moses, Anna Spagnoli

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Abstract

A novel role for IGF-I in MSC chondrogenesis was determined. IGF-I effects were evaluated in the presence or absence of TGF-β signaling by conditionally inactivating the TGF-β type II receptor. We found that IGF-I had potent chondroinductive actions on MSCs. IGF-I effects were independent from and additive to TGF-β. Introduction: Mesenchymal stem cells (MSCs) can be isolated from adult bone marrow (BM), expanded, and differentiated into several cell types, including chondrocytes. The role of IGF-I in the chondrogenic potential of MSCs is poorly understood. TGF-β induces MSC chondrogenic differentiation, although its actions are not well defined. The aim of our study was to define the biological role of IGF-I on proliferation, chondrogenic condensation, apoptosis, and differentiation of MSCs into chondrocytes, alone or in combination with TGF-β and in the presence or absence of TGF-β signaling. Materials and Methods: Mononuclear adherent stem cells were isolated from mouse BM. Chondrogenic differentiation was induced by culturing high-density MSC pellets in serum- and insulin-free defined medium up to 7 days, with or without IGF-I and/or TGF-β. We measured thymidine incorporation and stained 2-day-old pellets with TUNEL, cleaved caspase-3, peanut-agglutinin, and N-cadherin. Seven-day-old pellets were measured in size, stained for proteoglycan synthesis, and analyzed for the expression of collagen II and Sox-9 by quantitative real time PCR. We obtained MSCs from mice in which green fluorescent protein (GFP) was under the Collagen2 promoter and determined GFP expression by confocal microscopy. We conditionally inactivated the TGF-β type II receptor (TβRII) in MSCs using a cre-lox system, generating TβRII knockout MSCs (RIIKO-MSCs). Results and Conclusions: IGF-I modulated MSC chondrogenesis by stimulating proliferation, regulating cell apoptosis, and inducing expression of chondrocyte markers. IGF-I chondroinductive actions were equally potent to TGF-β1, and the two growth factors had additive effects. Using RIIKO-MSCs, we showed that IGF-I chondrogenic actions are independent from the TGF-β signaling. We found that the extracellular signal-related kinase 1/2 mitogen-activated protein kinase (Erk1/2 MAPK) pathway mediated the TGF-β1 mitogenic response and in part the IGF-I proliferative action. Our data, by showing the role of IGF-I and TGF-β1 in the critical steps of MSC chondrogenesis, provide critical information to optimize the therapeutic use of MSCs in cartilage disorders.

Original languageEnglish (US)
Pages (from-to)626-636
Number of pages11
JournalJournal of Bone and Mineral Research
Volume21
Issue number4
DOIs
StatePublished - Apr 1 2006

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Chondrogenesis
Mesenchymal Stromal Cells
Insulin-Like Growth Factor I
Bone Marrow
Chondrocytes
Green Fluorescent Proteins
MAP Kinase Kinase 2
MAP Kinase Kinase 1
Apoptosis
Peanut Agglutinin
In Situ Nick-End Labeling
Therapeutic Uses
Proteoglycans
Cadherins

Keywords

  • Bone marrow
  • Chondrocytes
  • Growth factors
  • Molecular pathways
  • Stem cells

ASJC Scopus subject areas

  • Surgery

Cite this

Effect of IGF-I in the chondrogenesis of bone marrow mesenchymal stem cells in the presence or absence of TGF-β signaling. / Longobardi, Lara; O'Rear, Lynda; Aakula, Srikanth; Johnstone, Brian; Shimer, Kimberly; Chytil, Anna; Horton, William A.; Moses, Harold L.; Spagnoli, Anna.

In: Journal of Bone and Mineral Research, Vol. 21, No. 4, 01.04.2006, p. 626-636.

Research output: Contribution to journalArticle

Longobardi, Lara ; O'Rear, Lynda ; Aakula, Srikanth ; Johnstone, Brian ; Shimer, Kimberly ; Chytil, Anna ; Horton, William A. ; Moses, Harold L. ; Spagnoli, Anna. / Effect of IGF-I in the chondrogenesis of bone marrow mesenchymal stem cells in the presence or absence of TGF-β signaling. In: Journal of Bone and Mineral Research. 2006 ; Vol. 21, No. 4. pp. 626-636.
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AU - Longobardi, Lara

AU - O'Rear, Lynda

AU - Aakula, Srikanth

AU - Johnstone, Brian

AU - Shimer, Kimberly

AU - Chytil, Anna

AU - Horton, William A.

AU - Moses, Harold L.

AU - Spagnoli, Anna

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N2 - A novel role for IGF-I in MSC chondrogenesis was determined. IGF-I effects were evaluated in the presence or absence of TGF-β signaling by conditionally inactivating the TGF-β type II receptor. We found that IGF-I had potent chondroinductive actions on MSCs. IGF-I effects were independent from and additive to TGF-β. Introduction: Mesenchymal stem cells (MSCs) can be isolated from adult bone marrow (BM), expanded, and differentiated into several cell types, including chondrocytes. The role of IGF-I in the chondrogenic potential of MSCs is poorly understood. TGF-β induces MSC chondrogenic differentiation, although its actions are not well defined. The aim of our study was to define the biological role of IGF-I on proliferation, chondrogenic condensation, apoptosis, and differentiation of MSCs into chondrocytes, alone or in combination with TGF-β and in the presence or absence of TGF-β signaling. Materials and Methods: Mononuclear adherent stem cells were isolated from mouse BM. Chondrogenic differentiation was induced by culturing high-density MSC pellets in serum- and insulin-free defined medium up to 7 days, with or without IGF-I and/or TGF-β. We measured thymidine incorporation and stained 2-day-old pellets with TUNEL, cleaved caspase-3, peanut-agglutinin, and N-cadherin. Seven-day-old pellets were measured in size, stained for proteoglycan synthesis, and analyzed for the expression of collagen II and Sox-9 by quantitative real time PCR. We obtained MSCs from mice in which green fluorescent protein (GFP) was under the Collagen2 promoter and determined GFP expression by confocal microscopy. We conditionally inactivated the TGF-β type II receptor (TβRII) in MSCs using a cre-lox system, generating TβRII knockout MSCs (RIIKO-MSCs). Results and Conclusions: IGF-I modulated MSC chondrogenesis by stimulating proliferation, regulating cell apoptosis, and inducing expression of chondrocyte markers. IGF-I chondroinductive actions were equally potent to TGF-β1, and the two growth factors had additive effects. Using RIIKO-MSCs, we showed that IGF-I chondrogenic actions are independent from the TGF-β signaling. We found that the extracellular signal-related kinase 1/2 mitogen-activated protein kinase (Erk1/2 MAPK) pathway mediated the TGF-β1 mitogenic response and in part the IGF-I proliferative action. Our data, by showing the role of IGF-I and TGF-β1 in the critical steps of MSC chondrogenesis, provide critical information to optimize the therapeutic use of MSCs in cartilage disorders.

AB - A novel role for IGF-I in MSC chondrogenesis was determined. IGF-I effects were evaluated in the presence or absence of TGF-β signaling by conditionally inactivating the TGF-β type II receptor. We found that IGF-I had potent chondroinductive actions on MSCs. IGF-I effects were independent from and additive to TGF-β. Introduction: Mesenchymal stem cells (MSCs) can be isolated from adult bone marrow (BM), expanded, and differentiated into several cell types, including chondrocytes. The role of IGF-I in the chondrogenic potential of MSCs is poorly understood. TGF-β induces MSC chondrogenic differentiation, although its actions are not well defined. The aim of our study was to define the biological role of IGF-I on proliferation, chondrogenic condensation, apoptosis, and differentiation of MSCs into chondrocytes, alone or in combination with TGF-β and in the presence or absence of TGF-β signaling. Materials and Methods: Mononuclear adherent stem cells were isolated from mouse BM. Chondrogenic differentiation was induced by culturing high-density MSC pellets in serum- and insulin-free defined medium up to 7 days, with or without IGF-I and/or TGF-β. We measured thymidine incorporation and stained 2-day-old pellets with TUNEL, cleaved caspase-3, peanut-agglutinin, and N-cadherin. Seven-day-old pellets were measured in size, stained for proteoglycan synthesis, and analyzed for the expression of collagen II and Sox-9 by quantitative real time PCR. We obtained MSCs from mice in which green fluorescent protein (GFP) was under the Collagen2 promoter and determined GFP expression by confocal microscopy. We conditionally inactivated the TGF-β type II receptor (TβRII) in MSCs using a cre-lox system, generating TβRII knockout MSCs (RIIKO-MSCs). Results and Conclusions: IGF-I modulated MSC chondrogenesis by stimulating proliferation, regulating cell apoptosis, and inducing expression of chondrocyte markers. IGF-I chondroinductive actions were equally potent to TGF-β1, and the two growth factors had additive effects. Using RIIKO-MSCs, we showed that IGF-I chondrogenic actions are independent from the TGF-β signaling. We found that the extracellular signal-related kinase 1/2 mitogen-activated protein kinase (Erk1/2 MAPK) pathway mediated the TGF-β1 mitogenic response and in part the IGF-I proliferative action. Our data, by showing the role of IGF-I and TGF-β1 in the critical steps of MSC chondrogenesis, provide critical information to optimize the therapeutic use of MSCs in cartilage disorders.

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KW - Chondrocytes

KW - Growth factors

KW - Molecular pathways

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