Assessment of adhesion mechanisms and behaviors of P-selectin targeted microbubbles in inflammatory microcirculation model / 中华超声影像学杂志

ABSTRACT

Objective To evaluate the adhesion mechanisms and microvascular behaviors of P-selectin targeted microbubbles and isotype control microbubbles.Methods The targeted microbubbles with FITC fluorescence and antibodies of P-selectin (MBp), and the isotype control microbubbles with FITC fluorescence and isotype antibodies(MBiso) were constructed.MBp and MBiso were injected intravenously in random to wild-type mice with TNF-α stimulus.The mechanisms and behaviors of MBp and MBiso in cremasteric venules were assessed by fluorescence microscopy.And then velocity variation of ultrasound microbubbles in microvascular was analyzed by tracking fixed-point technology of image-pro-plus software.Results The retention of microbubbles directly to venular endothelium amounted to (8.4 ± 2.1 )/view in MBp-group,while it was only (0.8 ± 0.8)/view in MBiso-group.Difference was evident between of the two groups( P ＜0.01 ).The numbers of MBp and MBiso attachment to activated leukocytes were (3.6± 0.6)/view and (2.2± 0.8)/view separately.There was no obvious difference between the two groups( P ＞0.05).The variation curves of velocity in MBp and MBiso targeting to venular endothelium were different.The flowing rate decreased gradually in MBp-group,while it decreased rapidly in MBiso-group.Conclusions MBp and MBiso have different behaviors targeting to venular endothelium, MBp could adhere to vascular endothelial efficiently and specifically, these results suggest MBp may be used to assess inflammation of vascular endothelial or other tissue injury effectively.