Intravital Multiphoton Microscopy Analysis of Spatial Relationships in Murine Skull Bone Marrow - a podcast by Ludwig-Maximilians-Universität München

The BM is a key organ of hematopoiesis and also has an important role in the immune system. The BM microenvironment is a complex, highly vascularized 3D structure composed of different cell types and extracellular matrix. Intense cellular traffic takes place from the peripheral blood to the BM and vice versa. However, the precise arrangement and microscopic dimensions of this environment have only been inferred so far from static imaging of sectioned tissue. We developed a new model to characterize and analyze the 3D microanatomy of murine skull BM in its physiological state using intravital MPM. This technology offers deep tissue penetration, low phototoxicity, superior image contrast and 3D resolution compared to other microscopy techniques. This makes MPM a powerful tool to investigate the BM, overcoming its anatomic inaccessibility. To quantify the dimensions of the BM compartment, we used high molecular weight FITC-dextran and Rhodamine 6G, which delineated the intra- and extravascular space, respectively. Measurements were generated using the 3D visualization and measurement software VoxBlast 3.1 after using a thresholding technique carried out by Adobe Photoshop 6.0. Results were expressed as the ratio of intravascular to extravascular space for different microvascular segments. Moreover, we performed adoptive transfer experiments with isolated naïve B-cells and TCM and studied their location within the BM compartment. The new approach presented here will be a useful tool for further in vivo investigations of cell behavior, trafficking and interactions in the BM.

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