摘要：Human olfactory mucosa mesenchymal-like stem cells (hOM-MSCs) secrete paracrine factors that may exert a protective effect on the cerebral ischemia. This study was done to determine the hypoxic and ischemic effects on the mRNA and protein expression level of paracrine factors by hOM-MSCs. The hOM-MSCs were cultured with 5% or 20% serum and under either normoxic (21% O2) or hypoxic (3% O2) conditions. Expression levels of mRNA and protein for vascular endothelial growth factor (VEGF), nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), glial cell line-derived neurotrophic factor (GDNF) and matrix metalloproteinase-2 (MMP-2) were determined by quantitative reverse transcription polymerase chain reaction and Western blot, respectively. Hypoxia reduced gene expression for VEGF (5% serum), GDNF, BDNF (5% serum) and NGF (5% serum) and increased it for BDNF (20% serum), MMP-2 (5% serum) and NGF (20% serum). Ischemia lowered gene expression for VEGF (hypoxia), GDNF, BDNF (hypoxia), MMP-2 (normoxia) and NGF (hypoxia) and increased it for VEGF (normoxia), BDNF (normoxia), MMP-2 (hypoxia) and NGF (normoxia).The protein level of these factors was almost in line with the gene level. These data demonstrate that serum and oxygen levels have a significant effect on the gene and protein expression levels of paracrine factors by hOM-MSCs, which will affect how hOM-MSCs interact in vivo during cerebral ischemia.
