Three-dimensional geometric modeling of membrane-bound organelles in ventricular myocytes: bridging the gap between microscopic imaging and mathematical simulation.
A general framework of image-based geometric processing is presented to bridge the gap between three-dimensional (3D) imaging that provides structural details of a biological system and mathematical simulation where high-quality surface or volumetric meshes are required. A 3D density map is processed in the order of image pre-processing (contrast enhancement and anisotropic filtering), feature extraction (boundary segmentation and skeletonization), and high-quality and realistic surface (triangular) and volumetric (tetrahedral) mesh generation. While the tool-chain described is applicable to general types of 3D imaging data, the performance is demonstrated specifically on membrane-bound organelles in ventricular myocytes that are imaged and reconstructed with electron microscopic (EM) tomography and two-photon microscopy (T-PM). Of particular interest in this study are two types of membrane-bound Ca(2+)-handling organelles, namely, transverse tubules (T-tubules) and junctional sarcoplasmic reticulum (jSR), both of which play an important role in regulating the excitation-contraction (E-C) coupling through dynamic Ca(2+) mobilization in cardiomyocytes.
Department of Mathematics, University of California, San Diego, La Jolla, CA 92093, USA. yuz@uwm.edu
Zeyun
Z
Yu
Michael J
MJ
Holst
Takeharu
T
Hayashi
Chandrajit L
CL
Bajaj
Mark H
MH
Ellisman
J Andrew
JA
McCammon
Masahiko
M
Hoshijima
D000818:Animals; D003952:Diagnostic Imaging; D006352:Heart Ventricles / Q000378:metabolism; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008433:Mathematics; D032342:Muscle Cells / Q000378:metabolism; D032383:Myocytes, Cardiac / Q000378:metabolism / Q000648:ultrastructure*; D015388:Organelles / Q000378:metabolism; D012508:Sarcolemma / Q000378:metabolism; D012519:Sarcoplasmic Reticulum / Q000378:metabolism* / Q000648:ultrastructure*