proteoglycan 5 controlled study 4 Animals 3 Proteoglycans 3 animal 3 animal cell 3 male 3 mouse 3 nonhuman 3 Article 2 Cartilage repair 2 Male 2 Mice 2 article 2 cell differentiation 2 cell proliferation 2 cell structure 2 comparative study 2 cytology 2 dental pulp stem cell 2 drug effect 2 extracellular matrix 2 gene expression 2 genetics 2 in vitro study 2 mesenchymal stem cell 2 metabolism 2 protein expression 2 reverse transcription polymerase chain reaction 2 staining 2