Mechanical biomarkers of oocyte maturation

Zarnescu, Livia; Han, Jinnuo; Behr, Barry; Pera, Renee Reijo; Camarillo, David B.

doi:10.1016/j.fertnstert.2014.07.292

Cited by 1 publication

(1 citation statement)

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“…Ideally, a compelling accurate cell model is expected to describe the roles of different components. However, a majority of studies regarding the mechanical properties of oocytes have assumed that it is homogeneous [ 1 , 4 ], partly due to the technical difficulty in mechanical characterization of the subcellular structures. The limited documents of ZP and cytoplasm show a disparity in Young’s modulus of ZP and the viscosity of the cytoplasm.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization and Modelling of Subcellular Components of Oocytes

Chen

Zhang

et al. 2022

Micromachines

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The early steps of embryogenesis are controlled exclusively by the quality of oocyte that linked closely to its mechanical properties. The mechanical properties of an oocyte were commonly characterized by assuming it was homogeneous such that the result deviated significantly from the true fact that it was composed of subcellular components. In this work, we accessed and characterized the subcellular components of the oocytes and developed a layered high-fidelity finite element model for describing the viscoelastic responses of an oocyte under loading. The zona pellucida (ZP) and cytoplasm were isolated from an oocyte using an in-house robotic micromanipulation platform and placed on AFM to separately characterizing their mechanical profiling by analyzing the creep behavior with the force clamping technique. The spring and damping parameters of a Kelvin–Voigt model were derived by fitting the creeping curve to the model, which were used to define the shear relaxation modulus and relaxation time of ZP or cytoplasm in the ZP and cytoplasm model. In the micropipette aspiration experiment, the model was accurate sufficiently to deliver the time-varying aspiration depth of the oocytes under the step negative pressure of a micropipette. In the micropipette microinjection experiment, the model accurately described the intracellular strain introduced by the penetration. The developed oocyte FEM model has implications for further investigating the viscoelastic responses of the oocytes under different loading settings.

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Section: Introductionmentioning

confidence: 99%