Preface |
|
v | |
|
|
1 | (186) |
|
Chapter 1 Cell Mechanics as a Framework |
|
|
3 | (16) |
|
1.1 Cell mechanics and human disease |
|
|
4 | (4) |
|
Specialized cells in the ear allow you to hear |
|
|
5 | (1) |
|
Hemodynamic forces regulate endothelial cells |
|
|
6 | (1) |
|
To keep bone healthy, bone cells need mechanical stimulation |
|
|
6 | (1) |
|
The cells that line your lungs sense stretch |
|
|
7 | (1) |
|
Pathogens can alter cell mechanical properties |
|
|
7 | (1) |
|
Other pathogens can use cell mechanical structures to their advantage |
|
|
7 | (1) |
|
Cancer cells need to crawl to be metastatic |
|
|
8 | (1) |
|
Viruses transfer their cargo into cells they infect |
|
|
8 | (1) |
|
1.2 The cell is an applied mechanics grand challenge |
|
|
8 | (1) |
|
Computer simulation of cell mechanics requires state-of-the-art approaches |
|
|
9 | (1) |
|
1.3 Model problem: micropipette aspiration |
|
|
9 | (10) |
|
What is a typical experimental setup for micropipette aspiration? |
|
|
9 | (2) |
|
The liquid-drop model is a simple model that can explain some aspiration results |
|
|
11 | (1) |
|
The Law of Laplace can be applied to a spherical cell |
|
|
12 | (1) |
|
Micropipette aspiration experiments can be analyzed with the Law of Laplace |
|
|
12 | (1) |
|
How do we measure surface tension and areal expansion modulus? |
|
|
13 | (2) |
|
|
15 | (1) |
|
Cells can behave as elastic solids or liquid drops |
|
|
16 | (1) |
|
|
16 | (1) |
|
|
17 | (1) |
|
|
17 | (2) |
|
Chapter 2 Fundamentals in Cell Biology |
|
|
19 | (34) |
|
2.1 Fundamentals in cell and molecular biology |
|
|
19 | (11) |
|
Proteins are polymers of amino acids |
|
|
20 | (2) |
|
DNA and RNA are polymers of nucleic acids |
|
|
22 | (2) |
|
Polysaccharides are polymers of sugars |
|
|
24 | (1) |
|
Fatty acids store energy but also form structures |
|
|
24 | (1) |
|
Correspondence between DNA-to-RNA-to-protein is the central dogma of modern cell biology |
|
|
25 | (2) |
|
Phenotype is the manifestation of genotype |
|
|
27 | (1) |
|
Transcriptional regulation is one way that phenotype differs from genotype |
|
|
28 | (1) |
|
Cell organelles perform a variety of functions |
|
|
29 | (1) |
|
2.2 Receptors are cells' primary chemical sensors |
|
|
30 | (6) |
|
Cells communicate by biochemical signals |
|
|
30 | (1) |
|
Signaling between cells can occur through many different mechanisms |
|
|
31 | (1) |
|
Intracellular signaling occurs via small molecules known as second messengers |
|
|
32 | (2) |
|
Large molecule signaling cascades have the potential for more specificity |
|
|
34 | (1) |
|
Receptors use several mechanisms to initiate signaling |
|
|
35 | (1) |
|
|
36 | (10) |
|
Optical techniques can display cells clearly |
|
|
37 | (1) |
|
Fluorescence visualizes cells with lower background |
|
|
38 | (1) |
|
Fluorophores can highlight structures |
|
|
39 | (1) |
|
Fluorophores can probe function |
|
|
40 | (1) |
|
Atomic force microscopy can elucidate the mechanical behavior of cells |
|
|
40 | (1) |
|
Gel electrophoresis can separate molecules |
|
|
41 | (1) |
|
Visualizing gel-separated products employs a variety of methods |
|
|
42 | (1) |
|
PCR amplifies specific DNA regions exponentially |
|
|
43 | (3) |
|
2.4 Experimental design in biology |
|
|
46 | (7) |
|
Reductionist experiments are powerful but limited |
|
|
46 | (2) |
|
Modern genetics has advanced our ability to study in situ |
|
|
48 | (1) |
|
Bioinformatics allows us to use vast amounts of genomic data |
|
|
49 | (1) |
|
Systems biology is integration rather than reduction |
|
|
49 | (1) |
|
Biomechanics and mechanobiology are integrative |
|
|
49 | (1) |
|
|
50 | (1) |
|
|
50 | (2) |
|
|
52 | (1) |
|
Chapter 3 Solid Mechanics Primer |
|
|
53 | (36) |
|
3.1 Rigid-body mechanics and free-body diagrams |
|
|
53 | (2) |
|
|
53 | (1) |
|
One of the most powerful, but underused, tools is a free-body diagram |
|
|
53 | (1) |
|
Identifying the forces is the first step in drawing a free-body diagram |
|
|
54 | (1) |
|
Influences are identified by applying the equations of motion |
|
|
54 | (1) |
|
Free-body diagrams can be drawn for parts of objects |
|
|
55 | (1) |
|
3.2 Mechanics of deformable bodies |
|
|
55 | (23) |
|
Rigid-body mechanics is not very useful for analyzing deformable bodies |
|
|
55 | (1) |
|
Mechanical stress is analogous to pressure |
|
|
56 | (1) |
|
Normal stress is perpendicular to the area of interest |
|
|
56 | (1) |
|
Strain represents the normalized change in length of an object to load |
|
|
57 | (1) |
|
The stress-strain plot for a material reveals information about its stiffness |
|
|
57 | (1) |
|
Stress and pressure are not the same thing, because stress has directionality |
|
|
58 | (1) |
|
Shear stress describes stress when forces and areas are perpendicular to each other |
|
|
59 | (1) |
|
Shear strain measures deformation resulting from shear stress |
|
|
59 | (1) |
|
Torsion in the thin-walled cylinder can be modeled with shear stress relations |
|
|
60 | (1) |
|
Torsion of a solid cylinder can be modeled as a torsion of a series of shells of increasing radius |
|
|
61 | (1) |
|
Kinematics, equilibrium, and constitutive equations are the foundation of solid mechanics |
|
|
62 | (1) |
|
Kinematics in a beam are the strain-displacement relationship |
|
|
62 | (2) |
|
Equilibrium in a beam is the stress-moment relationship |
|
|
64 | (1) |
|
The constitutive equation is the stress-strain relationship |
|
|
65 | (1) |
|
The second moment of inertia is a measure of bending resistance |
|
|
65 | (1) |
|
The cantilevered beam can be solved from the general beam equations |
|
|
66 | (1) |
|
Buckling loads can be determined from the beam equations |
|
|
67 | (1) |
|
Transverse strains occur with axial loading |
|
|
68 | (1) |
|
The general continuum equations can be developed from our simple examples |
|
|
68 | (1) |
|
Equilibrium implies conditions on stress |
|
|
69 | (2) |
|
Kinematics relate strain to displacement |
|
|
71 | (2) |
|
The constitutive equation or stress-strain relation characterizes the material behavior |
|
|
73 | (1) |
|
Vector notation is a compact way to express equations in continuum mechanics |
|
|
74 | (2) |
|
Stress and strain can be expressed as matrices |
|
|
76 | (1) |
|
In the principal directions shear stress is zero |
|
|
76 | (2) |
|
3.3 Large deformation mechanics |
|
|
78 | (5) |
|
The deformation gradient tensor describes large deformations |
|
|
78 | (1) |
|
Stretch is another geometrical measure of deformation |
|
|
79 | (1) |
|
Large deformation strain can be defined in terms of the deformation gradient |
|
|
80 | (2) |
|
The deformation gradient can be decomposed into rotation and stretch components |
|
|
82 | (1) |
|
3.4 Structural elements are defined by their shape and loading mode |
|
|
83 | (6) |
|
|
84 | (1) |
|
|
84 | (3) |
|
|
87 | (2) |
|
Chapter 4 Fluid Mechanics Primer |
|
|
89 | (30) |
|
|
89 | (3) |
|
Hydrostatic pressure results from gravitational forces |
|
|
89 | (2) |
|
Hydrostatic pressure is isotropic |
|
|
91 | (1) |
|
Resultant forces arising from hydrostatic pressure can be calculated through integration |
|
|
92 | (1) |
|
|
92 | (6) |
|
Fluids obey mass conservation |
|
|
93 | (1) |
|
Fluid flows can be laminar or turbulent |
|
|
94 | (1) |
|
Many laminar flows can be solved analytically |
|
|
95 | (2) |
|
Many biological fluids can exhibit non-Newtonian behavior |
|
|
97 | (1) |
|
4.3 The Navier-Stokes equations |
|
|
98 | (5) |
|
Derivation of the Navier-Stokes equations begins with Newton's second law |
|
|
99 | (3) |
|
Constitutive relations and the continuity equation are necessary to make Navier's equations solvable |
|
|
102 | (1) |
|
Navier-Stokes equations: putting it all together |
|
|
103 | (1) |
|
|
103 | (7) |
|
The mechanical behavior of viscoelastic materials can be decomposed into elastic and viscous components |
|
|
104 | (2) |
|
Complex moduli can be defined for viscoelastic materials |
|
|
106 | (2) |
|
Power laws can be used to model frequency-dependent changes in storage and loss moduli |
|
|
108 | (2) |
|
|
110 | (9) |
|
Dimensional analysis requires the determination of base parameters |
|
|
110 | (1) |
|
The Buckingham Pi Theorem gives the number of dimensionless parameters that can be formed from base parameters |
|
|
111 | (1) |
|
Dimensionless parameters can be found through solving a system of equations |
|
|
111 | (2) |
|
Similitude is a practical use of dimensional analysis |
|
|
113 | (1) |
|
Dimensional parameters can be used to check analytical expressions |
|
|
114 | (1) |
|
|
115 | (1) |
|
|
116 | (1) |
|
|
117 | (2) |
|
Chapter 5 Statistical Mechanics Primer |
|
|
119 | (32) |
|
Statistical mechanics relies on the use of probabilistic distributions |
|
|
119 | (1) |
|
Statistical mechanics can be used to investigate the influence of random molecular forces on mechanical behavior |
|
|
119 | (1) |
|
|
120 | (4) |
|
Potential energy can be used to make predictions of mechanical behavior |
|
|
120 | (2) |
|
Strain energy is potential energy stored in elastic deformations |
|
|
122 | (1) |
|
Equilibrium in continuum mechanics is a problem of strain energy minimization |
|
|
123 | (1) |
|
Changes in mechanical state alter internal energy |
|
|
123 | (1) |
|
|
124 | (4) |
|
Entropy is directly defined within statistical mechanics |
|
|
124 | (1) |
|
Microstates, macrostates, and density of states can be exemplified in a three-coin system |
|
|
124 | (3) |
|
Microstates, macrostates, and density of states provide insight to macroscopic system behavior |
|
|
127 | (1) |
|
Ensembles are collections of microstates sharing a common property |
|
|
127 | (1) |
|
Entropy is related to the number of microstates associated with a given macrostate |
|
|
127 | (1) |
|
|
128 | (3) |
|
Equilibrium behavior for thermodynamic systems can be obtained via free energy minimization |
|
|
128 | (1) |
|
Temperature-dependence of end-to-end length in polymers arises out of competition between energy and entropy |
|
|
129 | (2) |
|
5.4 Microcanonical ensemble |
|
|
131 | (5) |
|
The hairpinned polymer as a non-interacting two-level system |
|
|
132 | (1) |
|
A microcanonical ensemble can be used to determine constant energy microstates |
|
|
132 | (1) |
|
Entropy can be calculated via combinatorial enumeration of the density of states |
|
|
133 | (1) |
|
Entropy is maximal when half the sites contain hairpins |
|
|
133 | (1) |
|
S(W) can be used to predict equilibrium behavior |
|
|
133 | (1) |
|
The number of hairpins at equilibrium is dependent on temperature |
|
|
134 | (1) |
|
Equilibrium obtained via the microcanonical ensemble is identical to that obtained via free energy minimization |
|
|
135 | (1) |
|
|
136 | (7) |
|
Canonical ensemble starting from the microcanonical ensemble |
|
|
136 | (2) |
|
Probability distribution from the canonical ensemble gives Boltzmann's law |
|
|
138 | (1) |
|
The free energy at equilibrium can be found using the partition function |
|
|
139 | (2) |
|
The internal energy at equilibrium can be determined using the partition function |
|
|
141 | (1) |
|
Using the canonical approach may be preferable for analyzing thermodynamic systems |
|
|
142 | (1) |
|
|
143 | (8) |
|
A simple random walk can be demonstrated using soccer |
|
|
143 | (2) |
|
The diffusion equation can be derived from the random walk |
|
|
145 | (2) |
|
|
147 | (1) |
|
|
148 | (1) |
|
|
149 | (2) |
|
Chapter 6 Cell Mechanics in the Laboratory |
|
|
151 | (36) |
|
6.1 Probing the mechanical behavior of cells through cellular micromanipulation |
|
|
151 | (9) |
|
Known forces can be applied to cells through the use of cell-bound beads and an electromagnet |
|
|
152 | (1) |
|
The dependence of force on distance from the magnet tip can be calibrated through Stokes' law |
|
|
152 | (1) |
|
Magnetic twisting and multiple-pole micromanipulators can apply stresses to many cells simultaneously |
|
|
153 | (1) |
|
Optical traps generate forces on particles through transfer of light momentum |
|
|
153 | (1) |
|
Ray tracing elucidates the origin of restoring forces in optical tweezers |
|
|
154 | (1) |
|
What are the magnitudes of forces in an optical trap? |
|
|
155 | (1) |
|
How does optical trapping compare with magnetic micromanipulation? |
|
|
156 | (1) |
|
Atomic force microscopy involves the direct probing of objects with a small cantilever |
|
|
157 | (1) |
|
Cantilever deflection is detected using a reflected laser beam |
|
|
157 | (1) |
|
Scanning and tapping modes can be used to obtain cellular topography |
|
|
158 | (1) |
|
A Hertz model can be used to estimate mechanical properties |
|
|
158 | (2) |
|
6.2 Measurement of forces produced by cells |
|
|
160 | (7) |
|
Traction force microscopy measures the forces exerted by a cell on its underlying surface |
|
|
160 | (1) |
|
Cross-correlation can be used for particle tracking |
|
|
160 | (3) |
|
Determining the forces that produced a displacement is an inverse problem |
|
|
163 | (2) |
|
Microfabricated micropillar arrays can be used to measure traction forces directly |
|
|
165 | (1) |
|
Surface modification can help determine how a cell interacts with its surroundings |
|
|
166 | (1) |
|
6.3 Applying forces to cells |
|
|
167 | (6) |
|
Flow chambers are used for studying cellular responses to fluid shear stress |
|
|
167 | (1) |
|
The transition between laminar and turbulent flow is governed by the Reynolds number |
|
|
168 | (1) |
|
Parallel plate flow devices can be designed for low Reynolds number shear flow |
|
|
168 | (1) |
|
Fully developed flow occurs past the entrance length |
|
|
169 | (1) |
|
Cone-and-plate flow can be used to study responses to shear |
|
|
170 | (1) |
|
Diverse device designs can be used to study responses to fluid flow |
|
|
171 | (1) |
|
Flexible substrates are used for subjecting cells to strain |
|
|
172 | (1) |
|
Confined uniaxial stretching can lead to multiaxial cellular deformations |
|
|
172 | (1) |
|
Cylindrically symmetric deformations generate uniform biaxial stretch |
|
|
172 | (1) |
|
6.4 Analysis of deformation |
|
|
173 | (8) |
|
Viscoelastic behavior in micromanipulation experiments can be parameterized through spring-dashpot models |
|
|
173 | (1) |
|
Combinations of springs and dashpots can be used to model viscoelastic behavior |
|
|
174 | (3) |
|
Microscopy techniques can be adapted to visualize cells subject to mechanical loading |
|
|
177 | (1) |
|
Cellular deformations can be inferred from image sequences through image correlation-based approaches |
|
|
178 | (1) |
|
Intracellular strains can be computed from displacement fields |
|
|
179 | (2) |
|
6.5 Blinding and controls |
|
|
181 | (6) |
|
|
182 | (1) |
|
|
183 | (1) |
|
|
184 | (3) |
|
|
187 | (150) |
|
Chapter 7 Mechanics of Cellular Polymers |
|
|
189 | (34) |
|
|
189 | (5) |
|
Microfilaments are polymers composed of actin monomers |
|
|
189 | (1) |
|
F-actin polymerization is influenced by the molecular characteristics of G-actin |
|
|
189 | (2) |
|
Microtubules are polymers composed of tubulin dimers |
|
|
191 | (1) |
|
MT polymerization is affected by polarity and GTP/GDP binding |
|
|
191 | (1) |
|
Intermediate filaments are polymers with a diverse range in composition |
|
|
192 | (1) |
|
Intermediate filaments possess a coiled-coil structure |
|
|
192 | (1) |
|
Intermediate filaments have diverse functions in cells |
|
|
192 | (2) |
|
7.2 Polymerization kinetics |
|
|
194 | (4) |
|
Actin and MT polymerization can be modeled as a bimolecular reaction |
|
|
195 | (1) |
|
The critical concentration is the only concentration at which the polymer does not change length |
|
|
195 | (1) |
|
Polarity leads to different kinetics on each end |
|
|
196 | (1) |
|
Polymerization kinetics are affected by ATP/ADP in actin and GTP/GDP binding in tubulin |
|
|
197 | (1) |
|
Subunit polarity and ATP hydrolysis lead to polymer treadmilling |
|
|
197 | (1) |
|
|
198 | (5) |
|
Persistence length gives a measure of flexibility in a thermally fluctuating polymer |
|
|
198 | (2) |
|
Persistence length is related to flexural rigidity for an elastic beam |
|
|
200 | (2) |
|
Polymers can be classified as stiff, flexible, or semi-flexible by the persistence length |
|
|
202 | (1) |
|
|
203 | (7) |
|
The ideal chain is a polymer model for flexible polymers |
|
|
203 | (1) |
|
The probability for the chain to have different end-to-end lengths can be determined from the random walk |
|
|
204 | (3) |
|
The free energy of the ideal chain can be computed from its probability distribution function |
|
|
207 | (1) |
|
Force is the gradient of free energy in thermodynamic systems |
|
|
208 | (1) |
|
The behavior of polymers tends toward that of an ideal chain in the limit of long contour length |
|
|
209 | (1) |
|
7.5 Freely jointed chain (FJC) |
|
|
210 | (4) |
|
The FJC model places a limit on polymer extension |
|
|
210 | (1) |
|
The force-displacement relation for the FJC can be found by the canonical ensemble |
|
|
211 | (2) |
|
Differences between the ideal chain and the FJC emerge at large forces |
|
|
213 | (1) |
|
7.6 Worm-like chain (WLC) |
|
|
214 | (9) |
|
The WLC incorporates energetic effects of bending |
|
|
214 | (2) |
|
The force-displacement relation for the WLC can be found by the canonical ensemble |
|
|
216 | (1) |
|
Differences in the WLC and FJC emerge when they are fitted to experimental data for DNA |
|
|
217 | (1) |
|
Persistence length is related to Kuhn length |
|
|
218 | (1) |
|
|
219 | (1) |
|
|
220 | (1) |
|
|
221 | (2) |
|
Chapter 8 Polymer Networks and the Cytoskeleton |
|
|
223 | (26) |
|
|
223 | (2) |
|
Polymer networks have many degrees of freedom |
|
|
223 | (1) |
|
Effective continuums can be used to model polymer networks |
|
|
223 | (2) |
|
|
225 | (4) |
|
Cellular solids theory implies scaling relationships between effective mechanical properties and network volume fraction |
|
|
225 | (1) |
|
Bending-dominated deformation results in a nonlinear scaling of the elastic modulus with volume fraction |
|
|
225 | (2) |
|
Deformation dominated by axial strain results in a linear scaling of the elastic modulus with volume fraction |
|
|
227 | (1) |
|
The stiffness of tensegrity structures scales linearly with member prestress |
|
|
228 | (1) |
|
|
229 | (7) |
|
Affine deformations assume the filaments deform as if they are embedded in a continuum |
|
|
229 | (1) |
|
Flexible polymer networks can be modeled using rubber elasticity |
|
|
230 | (3) |
|
Anisotropic affine networks can be modeled using strain energy approaches |
|
|
233 | (1) |
|
Elastic moduli can be computed from strain energy density |
|
|
233 | (2) |
|
Elastic moduli of affine anisotropic networks can be calculated from appropriate strain energy density and angular distribution functions |
|
|
235 | (1) |
|
8.4 Biomechanical function and cytoskeletal structure |
|
|
236 | (13) |
|
Filopodia are cross-linked bundles of actin filaments involved in cell motility |
|
|
236 | (1) |
|
Actin filaments within filopodia can be modeled as elastic beams undergoing buckling |
|
|
236 | (2) |
|
The membrane imparts force on the ends of filopodia |
|
|
238 | (1) |
|
The maximum filopodium length before buckling in the absence of cross-linking is shorter than what is observed in vivo |
|
|
238 | (1) |
|
Cross-linking extends the maximum length before buckling |
|
|
238 | (1) |
|
Is the structure of the red blood cell's cytoskeleton functionally advantageous? |
|
|
239 | (1) |
|
Thin structures can be analyzed using the two-dimensional shear modulus and the areal strain energy density |
|
|
240 | (2) |
|
Sixfold connectivity facilitates resistance to shear |
|
|
242 | (3) |
|
Fourfold connectivity does not sustain shear as well as sixfold |
|
|
245 | (1) |
|
|
246 | (1) |
|
|
246 | (1) |
|
|
247 | (2) |
|
Chapter 9 Mechanics of the Cell Membrane |
|
|
249 | (30) |
|
|
249 | (3) |
|
Water is a polar molecule |
|
|
249 | (1) |
|
Cellular membranes form by interacting with water |
|
|
250 | (1) |
|
The saturation of the lipid tails determines some properties of the membrane |
|
|
251 | (1) |
|
The cell membrane distinguishes inside and outside |
|
|
251 | (1) |
|
The fluid mosaic model of the cell membrane describes its physical properties |
|
|
252 | (1) |
|
9.2 Phospholipid self-assembly |
|
|
252 | (3) |
|
Critical micelle concentration depends on amphiphile molecular structure |
|
|
253 | (1) |
|
Aggregate shape can be understood from packing constraints |
|
|
254 | (1) |
|
9.3 Membrane barrier function |
|
|
255 | (4) |
|
The diffusion equations relate concentration to flux per unit area |
|
|
256 | (1) |
|
Fick's second law shows how spatial concentration changes as a function of time |
|
|
257 | (2) |
|
9.4 Membrane mechanics I: In-plane shear and tension |
|
|
259 | (8) |
|
Thin structures such as membranes can be treated as plates or shells |
|
|
260 | (1) |
|
Kinematic assumptions help describe deformations |
|
|
260 | (2) |
|
A constitutive model describes material behavior |
|
|
262 | (1) |
|
The equilibrium condition simplifies for in-plane tension and shear |
|
|
262 | (3) |
|
Equilibrium simplifies in the case of shear alone |
|
|
265 | (1) |
|
Equilibrium simplifies in the case of equibiaxial tension |
|
|
266 | (1) |
|
Areal strain can be a measure of biaxial deformation |
|
|
267 | (1) |
|
9.5 Membrane mechanics II: Bending |
|
|
267 | (5) |
|
In bending the kinematics are governed by membrane rotation |
|
|
268 | (1) |
|
Linear elastic behavior is assumed for the constitutive model |
|
|
269 | (1) |
|
Equilibrium places conditions on resultant forces and moments |
|
|
269 | (3) |
|
Which dominates, tension or bending? |
|
|
272 | (1) |
|
9.6 Measurement of bending rigidity |
|
|
272 | (7) |
|
Membranes undergo thermal undulations similar to polymers |
|
|
272 | (1) |
|
Membranes straighten out with tension |
|
|
273 | (2) |
|
|
275 | (1) |
|
|
275 | (2) |
|
|
277 | (2) |
|
Chapter 10 Adhesion, Migration, and Contraction |
|
|
279 | (32) |
|
|
279 | (13) |
|
Cells can form adhesions with the substrate |
|
|
279 | (2) |
|
Fluid shear can be used to measure adhesion strength indirectly |
|
|
281 | (1) |
|
Detachment forces can be measured through direct cellular manipulation |
|
|
281 | (1) |
|
The surface tension/liquid-drop model can be used to describe simple adhesion |
|
|
282 | (2) |
|
Adhesive peeling can be modeled using continuum mechanics |
|
|
284 | (2) |
|
Adhesion energy density can be obtained through consideration of strain energy |
|
|
286 | (1) |
|
Targeting of white blood cells during inflammation involves the formation of transient and stable intercellular adhesions |
|
|
287 | (1) |
|
Kinetics of receptor-ligand binding can be described with the law of mass action |
|
|
288 | (2) |
|
The Bell model describes the effect of force on dissociation rate |
|
|
290 | (1) |
|
Shear enhances neutrophil adhesion---up to a point |
|
|
291 | (1) |
|
|
292 | (6) |
|
Cell migration can be studied in vitro and in vivo |
|
|
292 | (1) |
|
Cell locomotion occurs in distinct steps |
|
|
292 | (1) |
|
Protrusion is driven by actin polymerization |
|
|
293 | (1) |
|
Actin polymerization at the leading edge: involvement of Brownian motion? |
|
|
294 | (1) |
|
Cell motion can be directed by external cues |
|
|
295 | (1) |
|
Cell migration can be characterized by speed and persistence time |
|
|
296 | (2) |
|
Directional bias during cell migration can be obtained from cell trajectories |
|
|
298 | (1) |
|
|
298 | (13) |
|
Muscle cells are specialized cells for contractile force generation |
|
|
299 | (1) |
|
Studying cardiac function gave early insight into muscle function |
|
|
299 | (1) |
|
The skeletal muscle system generates skeletal forces for ambulation and mobility |
|
|
300 | (1) |
|
The Hill equation describes the relationship between muscle force and velocity |
|
|
300 | (1) |
|
Non-muscle cells can generate contractile forces within stress fibers |
|
|
301 | (1) |
|
Stress fiber pre-strain can be measured from buckling behavior |
|
|
302 | (1) |
|
Myosin cross-bridges generate sliding forces within actin bundles |
|
|
303 | (1) |
|
Myosin molecules work together to produce sliding |
|
|
304 | (1) |
|
The power-stroke model is a mechanical model of actomyosin interactions |
|
|
305 | (3) |
|
|
308 | (1) |
|
|
308 | (2) |
|
|
310 | (1) |
|
Chapter 11 Cellular Mechanotransduction |
|
|
311 | (26) |
|
|
311 | (7) |
|
Vascular endothelium experiences blood-flow-mediated shear stress |
|
|
312 | (1) |
|
Lumen-lining epithelial cells are subjected to fluid flow |
|
|
313 | (1) |
|
Fluid flow occurs in musculoskeletal tissues |
|
|
313 | (2) |
|
Fluid flow during embryonic development regulates the establishment of left-right asymmetry |
|
|
315 | (1) |
|
Strain and matrix deformation function as regulatory signals |
|
|
316 | (1) |
|
Smooth muscle cells and cardiac myocytes are subjected to strain in the cardiovascular system |
|
|
316 | (1) |
|
Cellular strain in the musculoskeletal system is dependent on tissue stiffness |
|
|
317 | (1) |
|
The lung and bladder are hollow elastic organs that are regulated by stretch |
|
|
317 | (1) |
|
Cells can respond to hydrostatic pressure |
|
|
317 | (1) |
|
11.2 Mechanosensing organelles and structures |
|
|
318 | (8) |
|
Stereocilia are the mechanosensors of the ear |
|
|
319 | (1) |
|
Specialized structures are used in touch sensation |
|
|
320 | (1) |
|
Primary cilia are nearly ubiquitous, but functionally mysterious |
|
|
320 | (1) |
|
Cellular adhesions can sense as well as transmit force |
|
|
321 | (1) |
|
The cytoskeleton can sense mechanical loads |
|
|
322 | (1) |
|
Mechanosensing can involve the glycoproteins covering the cell |
|
|
323 | (1) |
|
The cell membrane is ideally suited to sense mechanical loads |
|
|
324 | (1) |
|
Lipid rafts affect the behavior of proteins within the membrane |
|
|
325 | (1) |
|
11.3 Initiation of intracellular signaling |
|
|
326 | (4) |
|
Ion channels can be mechanosensitive |
|
|
326 | (1) |
|
Hydrophobic mismatches allow the mechanical gating of membrane channels |
|
|
327 | (1) |
|
Mechanical forces can expose cryptic binding sites |
|
|
328 | (1) |
|
Bell's equation describes protein unfolding kinetics |
|
|
329 | (1) |
|
Molecular conformation changes can be detected fluorescently |
|
|
329 | (1) |
|
11.4 Alteration of cellular function |
|
|
330 | (7) |
|
Intracellular calcium increases in response to mechanical stress |
|
|
330 | (1) |
|
Nitric oxide, inositol triphosphate, and cyclic AMP, like Ca2+, are second messenger molecules implicated in mechanosensation |
|
|
331 | (1) |
|
Mitogen-activated protein kinase activity is altered after exposure to mechanical stimulation |
|
|
332 | (1) |
|
Mechanically stimulated cells exhibit prostanglandin release |
|
|
332 | (1) |
|
Mechanical forces can induce morphological changes in cells |
|
|
332 | (1) |
|
Mechanical stimulation can induce extracellular matrix remodeling |
|
|
333 | (1) |
|
Cell viability and apoptosis are altered by different processes |
|
|
334 | (1) |
|
|
334 | (1) |
|
|
334 | (1) |
|
|
335 | (2) |
Abbreviations |
|
337 | (1) |
List of variables and units |
|
338 | (5) |
Index |
|
343 | |