Alexander F Fiedler, Ruth Leben, Herbert Stürmer, Robert Günther, Romano Matthys, Reto Nützi, Anja E Hauser, Raluca A Niesner
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引用次数: 0
Abstract
Intravital imaging of bone marrow provides a unique opportunity to study cellular dynamics and their interaction with the tissue microenvironment, which governs cell functions and metabolic profiles. To optically access the deep marrow of long bones, we previously developed a microendoscopy system for longitudinal two-photon fluorescence imaging of the murine femur. However, this does not provide information on cell functions or metabolism, for which quantification fluorescence lifetime imaging (FLIM) has proven to be a versatile tool. We present and characterize FLIMB, an adapted GRIN-based microendoscopic system capable of performing reliable, co-registered TCSPC-based two-photon excited FLIM and fluorescence imaging in the femur of fluorescent reporter mice, at sub-cellular resolution. Using FLIMB, we demonstrate metabolic imaging via NAD(P)H-FLIM and intracellular Ca2+ signaling via FRET-FLIM in immune cell subsets, in the femoral marrow. This method retains the power to study molecular mechanisms underlying various cell functions in tissue context thus providing new insights into bone biology.
期刊介绍:
The journal''s scope encompasses fundamental research, technology development, biomedical studies and clinical applications. BOEx focuses on the leading edge topics in the field, including:
Tissue optics and spectroscopy
Novel microscopies
Optical coherence tomography
Diffuse and fluorescence tomography
Photoacoustic and multimodal imaging
Molecular imaging and therapies
Nanophotonic biosensing
Optical biophysics/photobiology
Microfluidic optical devices
Vision research.