Antiatherosclerotic phenotype of perivascular adipose tissue surrounding the saphenous vein in coronary artery bypass grafting

冠動脈バイパス術（CABG）で大伏在静脈（SV）グラフトの血管周囲脂肪組織（PVAT）を温存したまま使用するNo-touch法が良好な成績を収め注目されている．本研究では術中に各種PVATを採取して組織性状と遺伝子発現を比較検討した．SV-PVATは冠動脈や大動脈のPVATに比してM1マクロファージの浸潤や炎症性サイトカイン発現が低く，No-touch法の成績向上に寄与している可能性が示唆された

Strain dependent differences in glucocorticoid-induced bone loss between C57BL/6J and CD-1 mice

We have investigated the effect of long-term glucocorticoid (GC) administration on bone turnover in two frequently used mouse strains; C57BL/6J and CD1, in order to assess the influence of their genetic background on GC-induced osteoporosis (GIO). GIO was induced in 12 weeks old female C57BL/6J and CD1 mice by subcutaneous insertion of long-term release prednisolone or placebo pellets. Biomechanical properties as assessed by three point bent testing revealed that femoral elasticity and strength significantly decreased in CD1 mice receiving GC, whereas C57BL/6J mice showed no differences between placebo and prednisolone treatment. Bone turnover assessed by microcomputer tomography revealed that contrary to C57BL/6J mice, prednisolone treated CD1 mice developed osteoporosis. In vitro experiments have underlined that, at a cellular level, C57BL/6J mice osteoclasts and osteoblasts were less responsive to GC treatment and tolerated higher doses than CD1 cells. Whilst administration of long-term release prednisolone pellets provided a robust GIO animal model in 12 weeks old CD1 mice, age matched C57BL/6J mice were not susceptible to the bone changes associated with GIO. This study indicates that for the induction of experimental GIO, the mouse strain choice together with other factors such as age should be carefully evaluated