[Effects of apolipoprotein A5 on adipogenic differentiation of human adipose mesenchymal stem cells].

Objective: To verify whether Apo A5 could inhibit the adipogenic differentiation of adipose mesenchymal stem cells (AMSCs). Methods: We isolated AMSCs by collagenase digestion method from the adipocyte tissue of patients underwent abdominal surgery in our hospital from February to July 2015. AMSCs were differentiated into mature adipocytes and incubated with Apo A5 (600 and 1 200 ng/ml) for 7, 14 and 21 days. Morphological changes, TG content, and gene expression levels of adipogenic differentiation markers were determined. Results: (1) The results of detecting the oil red O absorbance by spectrophotometer are as follows: At the 7th, 14th and 21st days after intervention, the absorbance of oil red O with 600 and 1 200 ng/ml Apo A5 intervention was lower than that of the control group (Day 7: 145.6±21.1, 110.5±31.5 vs. 195.4±35.7; Day 14: 289.2±24.2, 250.4±45.2 vs. 341.6±34.5; Day 21: 431.9±33.2, 374.7±26.4 vs. 488.2±22.5, all P< 0.05). (2) The intracellular TG content after Apo A5 intervention were detected by TG quantitative detection kit detection. At the 7th, 14th and 21st days, intracellular TG contents in 600 and 1 200 ng/ml Apo A5 groups were lower than that in the control group (Day 7:(203.1±22.6), (174.2±25.8)nmol/mg protein in Apo A5 intervention group vs. (266.25±23.7)nmol/mg protein in control group; Day 14: (332.5±23.2), (231.1±22.2)nmol/mg protein in Apo A5 intervention group vs. (452.2±16.4)nmol/mg protein in control group; Day 21: (482.8±21.2), (294.2±29.9)nmol/mg protein vs. (597.2±22.1)nmol/mg protein in control group, P< 0.05). (3) aP2 gene expression detected by real-time PCR and intracellular fatty acid synthase and lipid droplets coated protein gene expression levels determined by Western blot on day 7, 14 and 21 were significantly lower in Apo A5 groups than in control group (all P< 0.05). Conclusions: Apo A5 significantly reduced intracellular TG content and modulated the gene expression levels of adipogenic differentiation marker, thus, Apo A5 treatment can inhibit the adipogenic differentiation of adipose mesenchymal stem cells.