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Published on: December 10, 2010
Pea protein-derived tripeptide LRW shows osteoblastic activity on MC3T3-E1 cells via the activation of the Akt/Runx2
Harshita Arora1, Nan Shang, Khushwant S Bhullar
1Department of Agricultural, Food & Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada. jwu3@ualberta.ca.
Abstract:
Osteoporosis is a bone disease affecting more than 2 million people comprising 1 in 3 women and 1 in 5 men in Canada. One possible approach to prevent this disease is to stimulate the activity of osteoblasts (bone-forming cells) using food protein-derived bioactive peptides. In our previous study, an ACE inhibitory tripeptide LRW (Leu-Arg-Trp) was identified from pea protein. This work aims to investigate the effect of tripeptide LRW on promoting osteoblastic activity. The tripeptide LRW treatment (50 μM) in MC3T3-E1 cells increased cell proliferation (4-fold increase) as indicated by BrdU incorporation assay. Moreover, we found that tripeptide LRW stimulated osteoblastic differentiation by increasing the levels of type 1 collagen (COL1A2; 3-fold increase), alkaline phosphatase (ALP; 4-fold increase), and runt-related transcription factor 2 (Runx2; 2-fold increase) and the activation of the protein kinase B (Akt) signaling pathway. Furthermore, tripeptide LRW increased matrix mineralization as evidenced by Alizarin-S red staining and nodule formation, osteoprotegerin levels (OPG; 2-fold increase), and wound healing based on cell migration assay. Overall, pea protein-derived bioactive peptide LRW can positively modulate the activity of osteoblasts probably via the Akt/Runx2 pathway, indicating its potential use for the prevention of osteoporosis.
Insights
Pea protein peptide LRW promotes osteoblast activity, enhancing bone formation markers and mineralization. This bioactive peptide shows potential for preventing osteoporosis.
Area of Science:
- Biochemistry
- Cell Biology
- Nutritional Science
Background:
- Osteoporosis affects millions globally, with significant impact on women and men.
- Stimulating osteoblasts (bone-forming cells) with food protein-derived peptides is a potential preventive strategy.
- A previously identified ACE inhibitory tripeptide, Leu-Arg-Trp (LRW), derived from pea protein.
Purpose of the Study:
- To investigate the effect of the tripeptide LRW on promoting osteoblastic activity.
- To explore LRW's potential role in osteoporosis prevention.
Main Methods:
- MC3T3-E1 cells were treated with 50 μM tripeptide LRW.
- Assays included BrdU incorporation for proliferation, gene/protein analysis for differentiation markers (COL1A2, ALP, Runx2), Alizarin-S staining for mineralization, and cell migration assays.
- Western blotting assessed the Akt signaling pathway activation.
Main Results:
- LRW treatment significantly increased MC3T3-E1 cell proliferation (4-fold).
- Osteoblastic differentiation markers (COL1A2, ALP, Runx2) and osteoprotegerin (OPG) levels were elevated.
- LRW enhanced matrix mineralization and cell migration, suggesting improved bone healing potential.
- Activation of the Akt signaling pathway was observed.
Conclusions:
- The pea protein-derived peptide LRW positively modulates osteoblast activity.
- LRW likely acts via the Akt/Runx2 pathway to promote osteogenesis.
- LRW demonstrates potential as a therapeutic agent for osteoporosis prevention.
