Influence of p75 neurotrophin receptor knockout on the regeneration of facial nerves after crush injury in mouse / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the role of p75 neurotrophin receptor (p75NTR) in the regeneration of facial nerve crush injury.</p><p><b>METHODS</b>In p75NTR knockout mice and wild type mice, the regenerating fibres in the facial nerve were also labelled by an anterograde tracer cholera toxin B (CTB). The next day after injury of facial nerve, CTB was injected into the trunk of the nerve in the proximal side of the crush, and then anterograde tracing and immunohistochemistry were used to examine the regeneration of axons after facial nerve crush injury. In p75NTR knockout mice and wild type mice, the facial nerves on one side were crushed and regenerating neurons in the facial nerve nucleus were labelled by Fast Blue. The facial nerve trunk was cut in the bifurcated region in the 4th day after injury and the stump was inserted into a small polymer tube containing Fast Blue. Retrograde tracing and labling motoneuron counting were used to examine the survival of motoneurons in the facial nerve nucleus after facial nerve crush injury.</p><p><b>RESULTS</b>The results showed that the axonal growth of injured axons in the facial nerve of p75NTR knockout mice was significantly retarded. The number of regenerated neurons in the facial nerve nucleus in p75NTR knockout mice was significantly reduced (P < 0.05). Immunohistochemical staining of regenerating axons also showed the reduction in nerve regeneration in p75NTR knockout mice (P < 0.01).</p><p><b>CONCLUSION</b>p75NTR plays an important role in the regeneration of injured peripheral nerves after injury.</p>

Isolation, identification, culture and bionomics of skeletal muscles satellite cells from green fluorescent protein transgenic mouse in vitro / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the green fluorescent protein (GFP) expression and the bionomics of skeletal muscles satellite cells (SMSCs) in vitro in GFP transgenic mouse.</p><p><b>METHODS</b>The newborn transgenic mice were acquired to separate skeletal muscles satellite cells with enzyme digestion method. Cells were cultured and subcultured in vitro. Morphological observation, growth curve were investigated to evaluate the proliferation and differentiation characteristics of skeletal muscles satellite cells, fluorescence microscope was used to observe the GFP expression. The cells were identified by immunocytochemical stain. In the basis of identification of anti-sarcometric actin anti-body, the combination of anti-desmin antibody and DAPI (4, 6-diamidino-2-phenylindole) were used to detect the purification of skeletal muscles satellite cells.</p><p><b>RESULTS</b>Immunocytofluorescence suggested the good retain of GFP fluorescence in skeletal muscles satellite cells. The cells showed strong proliferative ability and they were positive with immunocytochemical stain of anti-sarcometric actin antibody and anti-desmin antibody. The combination of anti-desmin and DAPI stain can be used to determine the purification of SMSCs.</p><p><b>CONCLUSION</b>Skeletal muscles satellite cells cultured in vitro showed strong proliferation and differentiation ability. They are fit to construct the cell bank of tissure engineering and to be a useful tool to explore cells fate after transplantation since these cells retain the expression of GFP.</p>

Ectopic bone induction in vivo after transplantation of skeletal satellite cells from green fluorescence protein transgenic mouse transfected by adenoviral vectors encoding bone morphogenetic protein-2 / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To observe the ability of induced ectopic bone using skeletal muscles satellite cells (SMSCs) from newborn green fluorescence protein (GFP) transgenic mice mediated by Ad-BMP2.</p><p><b>METHODS</b>Transplantation of SMSCs transduced with Ad-BMP2 into back lamb muscles of subfascia in wildtype 129sv mice with a complex of collagen scaffords, then the tissue histologic examination, X ray plain film, fluorescence microscopy were used.</p><p><b>RESULTS</b>Transplantation of SMSCs transfected with Ad-BMP2 into back lamb muscles of subfascia generated ectopic bone formation involving GFP-positive osteoblasts and osteocytes 2 weeks and mature bone formation 4 weeks after transplantation. SMSCs non-transfected with Ad-BMP2 failed to induce ectopic bone formation.</p><p><b>CONCLUSION</b>SMSCs retain differentiation potentitality into osteoblasts in response to Ad-BMP2. They are useful tools for analyzing the process of osteoblast differentiation in vivo after transplantation.</p>

Correlation between periodontal disease and coronary atherosclerotic heart disease / 中国医学科学院学报

<p><b>OBJECTIVE</b>To investigate the correlation between coronary atherosclerotic heart disease (CAD) and periodontal disease (PD).</p><p><b>METHOD</b>Forty-five patients with CAD (CAD group) and 40 patients without CAD (control group) were compared with their pathological changes of periodontal tissues and inflammatory markers [high sensitive C reactive protein (hsCRP), interleukin-1beta (IL-1beta), and tumor necrosis factor-alpha (TNF-alpha)].</p><p><b>RESULTS</b>Univariate analysis showed that the prevalence of PD was 84.44% in CAD group and 22.50% in control group (P < 0.01). The levels of hsCRP, IL-1beta, and TNF-alpha were (5.75 +/- 1.26) mg/L, (10.32 +/- 2.96) ng/L, and (9.17 +/- 2.14) ng/L in CAD group and (1.13 +/- 0.73) mg/ L, (2.87 +/- 1.45) ng/L, and (5.84 +/- 1.96) ng/L in control group (P < 0.01). Gingival index and plaque index were statistically different between two both groups (P < 0.01). Logistic regression analysis showed that in addition to pulse pressure and low density lipoprotein cholesterol, periodontal disease index was a higher risk factor of CAD. Its relative risk was 1.217 (95% CI was 1.120-1.805, P < 0.05).</p><p><b>CONCLUSION</b>PD can cause CAD. The improvement of public oral health plays an important role in the prevention and treatment of CAD.</p>