Noninvasive 3D vital imaging and characterization of notochordal cells of the intervertebral disc by femtosecond near-infrared two-photon laser scanning microscopy and spatial-volume rendering

Microscopy Research and Technique
Thorsten GuehringUday K Tirlapur

Abstract

The central region of the intervertebral disc (IVD) in infant humans is made and maintained by notochordal cells (NCs). These cells disappear during maturation to be replaced by mature chondrocyte-like cells. NCs are completely different morphologically from the mature chondrocyte-like IVD cells and have complex and essential functions but little is known about them. Recently, two-photon laser scanning microscopy (TPLSM) using near-infrared (NIR) femtosecond pulsed lasers has emerged as a promising noninvasive optical technique for observing unfixed living 3D biological specimens in situ and in vitro. Several lines of evidence suggest that compared with conventional laser scanning confocal microscopy (LSCM), femtosecond NIR laser-based TPLSM has any number of advantages including 3D resolution without a spatial filter (confocal pinhole), minimal photobleaching, and photodamage above and below the focal plane, and importantly, greater depth penetration. We have thus taken advantage of these unique features of femtosecond laser-based TPLSM for vital 3D imaging in conjunction with advanced spatial-volume rendering modalities to compare morphologies of NCs/clusters from pig caudal discs with chondrocyte-like IVD cells from bovine c...Continue Reading

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