Computational Analysis of Ultra-Structural Images of Red Blood Cells

Das, M.; Das, Bishwajit; Das, Avishek; Chatterjee, Ishita; Majumder, Durjoy

doi:10.4172/2476-2261.1000104

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…The geometry of human RBCs has been studied extensively using a variety of different methods such as light microscopy [73,74], interference holography [75,76], resistive pulse spectroscopy [77], micropipette aspiration [78,79], and light scattering [80,81]. In Fig 2A, we summarize the reported values for the RBC geometrical parameters from the literature PLOS COMPUTATIONAL BIOLOGY [73,75,78,[81][82][83] in terms of the three characteristic lengths (h min , h max , and L) (Fig 1C), the volume (V), the surface area (A), and the sphericity index (SI). Several parametric models have been proposed to describe the biconcave morphology of the RBC [75,76,[84][85][86][87][88].…”

Section: Parameterization Of Rbc Biconcave Morphology and Shape Error Estimationmentioning

confidence: 99%

Non-uniform distribution of myosin-mediated forces governs red blood cell membrane curvature through tension modulation

et al. 2020

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The biconcave disk shape of the mammalian red blood cell (RBC) is unique to the RBC and is vital for its circulatory function. Due to the absence of a transcellular cytoskeleton, RBC shape is determined by the membrane skeleton, a network of actin filaments cross-linked by spectrin and attached to membrane proteins. While the physical properties of a uniformly distributed actin network interacting with the lipid bilayer membrane have been assumed to control RBC shape, recent experiments reveal that RBC biconcave shape also depends on the contractile activity of nonmuscle myosin IIA (NMIIA) motor proteins. Here, we use the classical Helfrich-Canham model for the RBC membrane to test the role of heterogeneous force distributions along the membrane and mimic the contractile activity of sparsely distributed NMIIA filaments. By incorporating this additional contribution to the Helfrich-Canham energy, we find that the RBC biconcave shape depends on the ratio of forces per unit volume in the dimple and rim regions of the RBC. Experimental measurements of NMIIA densities at the dimple and rim validate our prediction that (a) membrane forces must be nonuniform along the RBC membrane and (b) the force density must be larger in the dimple than the rim to produce the observed membrane curvatures. Furthermore, we predict that RBC membrane tension and the orientation of the applied forces play important roles in regulating this force-shape landscape. Our findings of heterogeneous force distributions on the plasma membrane for RBC shape maintenance may also have implications for shape maintenance in different cell types.

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Section: Parameterization Of Rbc Biconcave Morphology and Shape Error Estimationmentioning

confidence: 99%

Non-uniform distribution of myosin-mediated forces governs red blood cell membrane curvature through tension modulation

et al. 2020

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show abstract

“…In Fig. 2A, we summarize the reported values for the RBC geometrical parameters from the literature [67,69,72,[75][76][77] in terms of the three characteristic lengths ( h min , h max and L ) ( Fig. 1C), the volume (V), the surface area (A), and the sphericity index (SI).…”

Section: 3-parametrization Of Rbc Biconcave Morphology and Shape Ermentioning

confidence: 99%

Non-uniform distribution of myosin-mediated forces governs red blood cell membrane curvature through tension modulation

Alimohamadi

Smith

Nowak

et al. 2019

Preprint

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The biconcave disk shape of the mammalian red blood cell (RBC) is unique to the RBC and is vital for its circulatory function. Due to the absence of a transcellular cytoskeleton, RBC shape is determined by the membrane skeleton, a network of actin filaments cross-linked by spectrin and attached to membrane proteins. While the physical properties of a uniformly distributed actin network interacting with the lipid bilayer membrane have been assumed to control RBC shape, recent experiments reveal that RBC biconcave shape also depends on the contractile activity of nonmuscle myosin IIA (NMIIA) motor proteins. Here, we use the classical Helfrich-Canham model for the RBC membrane to test the role of heterogeneous force distributions along the membrane and mimic the contractile activity of sparsely distributed NMIIA filaments. By incorporating this additional contribution to the Helfrich-Canham energy, we find that the RBC biconcave shape depends on the ratio of forces per unit volume in the dimple and rim regions of the RBC. Experimental measurements of NMIIA densities at the dimple and rim validate our prediction that (a) membrane forces must be non-uniform along the RBC membrane and (b) the force density must be larger in the dimple than the rim to produce the observed membrane curvatures. Furthermore, we predict that RBC membrane tension and the orientation of the applied forces play important roles in regulating this force-shape landscape. Our findings of heterogeneous force distributions on the plasma membrane for RBC shape maintenance may also have implications for shape maintenance in different cell types.

show abstract

Computational Analysis of Ultra-Structural Images of Red Blood Cells

Cited by 2 publications

References 6 publications

Non-uniform distribution of myosin-mediated forces governs red blood cell membrane curvature through tension modulation

Non-uniform distribution of myosin-mediated forces governs red blood cell membrane curvature through tension modulation

Non-uniform distribution of myosin-mediated forces governs red blood cell membrane curvature through tension modulation

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