The effect of the local delivery of alendronate on human adipose-derived stem cell-based bone regeneration.
Recent studies have shown that alendronate (Aln) enhances the osteogenesis of osteoblasts and bone marrow mesenchymal stem cells. In this study, we hypothesize that Aln may act as an osteo-inductive factor to stimulate the osteogenic differentiation of human adipose-derived stem cells (hADSCs) for bone regeneration. The in vitro effect of Aln (1-10 μM) on the osteogenic ability of hADSCs was evaluated by examining mineralization and alkaline phosphatase (ALP) activity. Bone morphogenetic protein 2 (BMP2) expression was measured using a real-time polymerase chain reaction and western blot analysis. Our results indicated that 5 μM Aln was sufficient to enhance BMP2 expression, ALP activity and mineralization in hADSCs. The in vivo effect of locally administered Aln on bone repair was examined in a rat critical-sized (7-mm) calvarial defect that was implanted with a hADSC-seeded poly(lactic-co-glycolic acid) (PLGA) scaffold. Aln (5 μM/100 μl/day) was injected locally into the defect site for one week. New bone formation was evaluated by radiographic and histological analyses at 8 and 12 weeks post-implantation. The expression levels of human BMP2 (hBMP2) and hADSC localization in defect sites were examined using immunohistochemistry analysis and fluorescent in situ hybridization, respectively. Results showed that local treatment of Aln on hADSC-seeded PLGA scaffolds at week 12 had a maximal effect on bone regeneration, enhancing mineralization and bone matrix formation. In addition, hADSCs and hBMP2 were also detected at the defect sites. These results demonstrated that local delivery of Aln, a potent osteo-inductive factor, enhances hADSC osteogenesis and bone regeneration.
Wang
Chau-Zen
CZ
Department of Physiology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
Chen
Shih-Mao
SM
Chen
Chung-Hwan
CH
Wang
Chih-Kuang
CK
Wang
Gwo-Jaw
GJ
Chang
Je-Ken
JK
Ho
Mei-Ling
ML
D000273:Adipose Tissue / Q000166:cytology*; D019386:Alendronate / Q000494:pharmacology*; D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D055396:Bone Morphogenetic Protein 2 / Q000378:metabolism; D001861:Bone Regeneration / Q000187:drug effects*; D002113:Calcification, Physiologic / Q000187:drug effects; D002478:Cells, Cultured; D016503:Drug Delivery Systems; D006801:Humans; D007150:Immunohistochemistry; D020007:Implants, Experimental; D017404:In Situ Hybridization, Fluorescence; D019344:Lactic Acid / Q000494:pharmacology; D008297:Male; D010012:Osteogenesis / Q000187:drug effects; D011100:Polyglycolic Acid / Q000494:pharmacology; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D051381:Rats; D017207:Rats, Sprague-Dawley; D012886:Skull / Q000187:drug effects / Q000473:pathology; D013234:Stem Cells / Q000166:cytology / Q000187:drug effects* / Q000201:enzymology; D014945:Wound Healing / Q000187:drug effects
D055396:Bone Morphogenetic Protein 2; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D000469:Alkaline Phosphatase; D019386:Alendronate