Chemotaxis - Knowledge

372:, which adds methyl residues to the same glutamate residues. If the level of an attractant remains high, the level of phosphorylation of CheA (and, therefore, CheY and CheB) will remain low, the cell will swim smoothly, and the level of methylation of the MCPs will increase (because CheB-P is not present to demethylate). The MCPs no longer respond to the attractant when they are fully methylated; therefore, even though the level of attractant might remain high, the level of CheA-P (and CheB-P) increases and the cell begins to tumble. The MCPs can be demethylated by CheB-P, and, when this happens, the receptors can once again respond to attractants. The situation is the opposite with regard to repellents: fully methylated MCPs respond best to repellents, while least-methylated MCPs respond worst to repellents. This regulation allows the bacterium to 'remember' chemical concentrations from the recent past, a few seconds, and compare them to those it is currently experiencing, thus 'know' whether it is traveling up or down a gradient. that bacteria have to chemical gradients, other mechanisms are involved in increasing the absolute value of the sensitivity on a given background. Well-established examples are the ultra-sensitive response of the motor to the CheY-P signal, and the clustering of chemoreceptors. 180: 868: 878: 699: 283: 396: 573:. Eukaryotic chemotaxis involves detecting a concentration gradient spatially by comparing the asymmetric activation of these receptors at the different ends of the cell. Activation of these receptors results in migration towards chemoattractants, or away from chemorepellants. In mating yeast, which are non-motile, patches of polarity proteins on the cell cortex can relocate in a chemotactic fashion up pheromone gradients. 5862: 347: 1137: 838: 22: 939:). Investigations of the three-dimensional structures of chemokines provided evidence that a characteristic composition of beta-sheets and an alpha helix provides expression of sequences required for interaction with the chemokine receptors. Formation of dimers and their increased biological activity was demonstrated by crystallography of several chemokines, e.g. IL-8. 1186:) pathogens itself represents a significant clinical target. Modification of endogenous chemotactic ability of these microorganisms by pharmaceutical agents can decrease or inhibit the ratio of infections or spreading of infectious diseases. Apart from infections, there are some other diseases wherein impaired chemotaxis is the primary etiological factor, as in 584:(MCPs). This results in their desensitization and allows prokaryotes to "remember" and adapt to a chemical gradient. In contrast, chemotactic memory in eukaryotes can be explained by the Local Excitation Global Inhibition (LEGI) model. LEGI involves the balance between a fast excitation and delayed inhibition which controls downstream signaling such as 544: 1959: 338:, and it is a common form of signal transduction in bacteria. CheY induces tumbling by interacting with the flagellar switch protein FliM, inducing a change from counter-clockwise to clockwise rotation of the flagellum. Change in the rotation state of a single flagellum can disrupt the entire flagella bundle and cause a tumble. 657:

chemoattractant. However, these molecules apparently are activated independently of the motility of the cell. That is, even an immnobilized cell is still able to detect the direction of a chemoattractant. There appear to be mechanisms by which an external chemotactic gradient is sensed and turned into an intracellular Ras and

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in the 1950s. In the 1960s and 1970s, the revolution of modern cell biology and biochemistry provided a series of novel techniques that became available to investigate the migratory responder cells and subcellular fractions responsible for chemotactic activity. The availability of this technology led

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are di-, tri-, tetrapeptides of bacterial origin, formylated on the N-terminus of the peptide. They are released from bacteria in vivo or after decomposition of the cell, a typical member of this group is the N-formylmethionyl-leucyl-phenylalanine (abbreviated fMLF or fMLP). Bacterial fMLF is a key

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bacteria will chemotax, or direct their overall motion based on the gradient. If the bacterium senses that it is moving in the correct direction (toward attractant/away from repellent), it will keep swimming in a straight line for a longer time before tumbling; however, if it is moving in the wrong

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of soil microorganisms is a function of their chemotactic sensitivities towards substrate and fellow organisms. The chemotactic behavior of the bacteria was proven to lead to non-trivial population patterns even in the absence of environmental heterogeneities. The presence of structural pore scale

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The specific molecule/s that allow a eukaryotic cells detect a gradient of chemoattractant ligands (that is, a sort of the molecular compass that detects the direction of a chemoattractant) seems to change depending on the cell and chemoattractant receptor involved or even the concentration of the

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Chemoattractants or chemorepellents bind MCPs at its extracellular domain; an intracellular signaling domain relays the changes in concentration of these chemotactic ligands to downstream proteins like that of CheA which then relays this signal to flagellar motors via phosphorylated CheY (CheY-P).

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are intermediate products of the complement cascade. Their synthesis is joined to the three alternative pathways (classical, lectin-dependent, and alternative) of complement activation by a convertase enzyme. The main target cells of these derivatives are neutrophil granulocytes and monocytes as

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Capillary tube assay for chemotaxis. Motile prokaryotes sense chemicals in their environment and change their motility accordingly. Absent chemicals, movement is completely random. When an attractant or repellent is present, runs become longer and tumbles become less frequent. The result is net

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that use artificial chemotaxis to navigate autonomously have been designed. Applications include targeted delivery of drugs in the body. More recently, enzyme molecules have also shown positive chemotactic behavior in the gradient of their substrates. The thermodynamically favorable binding of

296:, called methyl-accepting chemotaxis proteins (MCPs), which vary in the molecules that they detect. Thousands of MCP receptors are known to be encoded across the bacterial kingdom. These receptors may bind attractants or repellents directly or indirectly through interaction with proteins of 258:

This biased random walk is a result of simply choosing between two methods of random movement; namely tumbling and straight swimming. The helical nature of the individual flagellar filament is critical for this movement to occur. The protein structure that makes up the flagellar filament,

330:, CheA, at a single highly conserved histidine residue. CheA, in turn, transfers phosphoryl groups to conserved aspartate residues in the response regulators CheB and CheY; CheA is a histidine kinase and it does not actively transfer the phosphoryl group, rather, the response regulator 1761: 1360:

Although interactions of the factors listed above make the behavior of the solutions of mathematical models of chemotaxis rather complex, it is possible to describe the basic phenomenon of chemotaxis-driven motion in a straightforward way. Indeed, let us denote with

274:, are monoflagellated and have a single flagellum at one pole of the cell. Their method of chemotaxis is different. Others possess a single flagellum that is kept inside the cell wall. These bacteria move by spinning the whole cell, which is shaped like a corkscrew. 461:

cause MCPs to have lower affinity to chemoattractants which causes increased activity of CheA and CheY-P resulting in tumbles. In this way cells are able to adapt to the immediate chemoattractant concentration and detect further changes to modulate cell motility.

104:. The aberrant chemotaxis of leukocytes and lymphocytes also contribute to inflammatory diseases such as atherosclerosis, asthma, and arthritis. Sub-cellular components, such as the polarity patch generated by mating yeast, may also display chemotactic behavior. 2535:

Planagumà A, Domènech T, Pont M, Calama E, García-González V, López R, et al. (October 2015). "Combined anti CXC receptors 1 and 2 therapy is a promising anti-inflammatory treatment for respiratory diseases by reducing neutrophil migration and activation".

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Levels of receptors, intracellular signalling pathways and the effector mechanisms all represent diverse, eukaryotic-type components. In eukaryotic unicellular cells, amoeboid movement and cilium or the eukaryotic flagellum are the main effectors (e.g.,

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and the beat of the 9 + 2 microtubules within cilia. The orchestrated beating of hundreds of cilia is synchronized by a submembranous system built between basal bodies. The details of the signaling pathways are still not totally clear.

240:; in other words, bacteria "forget" the direction in which they are going. By repeatedly evaluating their course, and adjusting if they are moving in the wrong direction, bacteria can direct their random walk motion toward favorable locations. 158:. The significance of chemotaxis in biology and clinical pathology was widely accepted in the 1930s, and the most fundamental definitions underlying the phenomenon were drafted by this time. The most important aspects in quality control of 1059:-eicosatrirenoid acid); they stimulate leukocyte chemotaxis through the oxoeicosanoid receptor 1 with 5-oxoeicosatrienoic acid being as potent as its arachidonic acid-derived analog, 5-oxo-eicosatetraenoic acid, in stimulating human blood 26:

movement towards or away from the chemical (i.e., up or down the chemical gradient). The net movement can be seen in the beaker, where the bacteria accumulate around the origin of the attractant, and away from the origin of the repellent.

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cannot directly detect a concentration gradient. Instead, they employ temporal gradient sensing, where they move over larger distances several times their own width and measure the rate at which perceived chemical concentration changes.

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Rodríguez-Fernández JL, Criado-García O (October 2022). "A meta-analysis indicates that the regulation of cell motility is a non-intrinsic function of chemoattractant receptors that is governed independently of directional sensing".

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Apart from active enzymes, non-reacting molecules also show chemotactic behavior. This has been demonstrated by using dye molecules that move directionally in gradients of polymer solution through favorable hydrophobic interactions.

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refers to an increase in cellular motility in response to chemicals in the surrounding environment. Unlike chemotaxis, the migration stimulated by chemokinesis lacks directionality, and instead increases environmental scanning

1708:. This general equation applies to both the cell density and the chemo-attractant. Therefore, incorporating a diffusion flux into the total flux term, the interactions between these quantities are governed by a set of coupled 731:

of the chemoattractant is expressed or bound on a surface, in contrast to the classical model of chemotaxis, in which the gradient develops in a soluble fluid. The most common biologically active haptotactic surface is the

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component of inflammation has characteristic chemoattractant effects in neutrophil granulocytes and monocytes. The chemotactic factor ligands and receptors related to formyl peptides are summarized in the related article,

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The number of molecules capable of eliciting chemotactic responses is relatively high, and we can distinguish primary and secondary chemotactic molecules. The main groups of the primary ligands are as follows:

1954:{\displaystyle {\begin{aligned}{\partial C \over {\partial t}}&=f(C)+\nabla \cdot \left\\{\partial \varphi \over {\partial t}}&=g(\varphi ,C)+\nabla \cdot (D_{\varphi }\nabla \varphi )\end{aligned}}} 254:

use temporal sensing to decide whether their situation is improving or not, and in this way, find the location with the highest concentration of attractant, detecting even small differences in concentration.

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A wide range of techniques is available to evaluate chemotactic activity of cells or the chemoattractant and chemorepellent character of ligands. The basic requirements of the measurement are as follows:

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Rana AK, Li Y, Dang Q, Yang F (December 2018). "Monocytes in rheumatoid arthritis: Circulating precursors of macrophages and osteoclasts and, their heterogeneity and plasticity role in RA pathogenesis".

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is still not available, there are several protocols and pieces of equipment that offer good correspondence with the conditions described above. The most commonly used are summarised in the table below:

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eicosanoids are arachidonic acid metabolites also formed by ALOX5. Three members of the family form naturally and have prominent chemotactic activity. These, listed in order of decreasing potency, are:

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filaments. The growing distal end of actin filaments develops connections with the internal surface of the plasma membrane via different sets of peptides and results in the formation of anterior

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in the presence of the ligand. The diverse features of the chemotaxis receptors and ligands allows for the possibility of selecting chemotactic responder cells with a simple chemotaxis assay By

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While some chemotaxis receptors are expressed in the surface membrane with long-term characteristics, as they are determined genetically, others have short-term dynamics, as they are assembled

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C chemokines) represent structurally related molecules with a special arrangement of disulfide bridges but also their target cell specificity is diverse. CC chemokines act on monocytes (e.g.,

488:, causing movement toward infection sites. Non-acylated methioninyl peptides do not act as chemoattractants to neutrophils and macrophages. Leukocytes also move toward chemoattractants C5a, a 5441:

Kohidai L, Lang O and Csaba G (2003). "Chemotactic-range-fitting of amino acids and its correlations to physicochemical parameters in Tetrahymena pyriformis - Evolutionary consequences".

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A changed migratory potential of cells has relatively high importance in the development of several clinical symptoms and syndromes. Altered chemotactic activity of extracellular (e.g.,

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enzymes to their specific substrates is recognized as the origin of enzymatic chemotaxis. Additionally, enzymes in cascades have also shown substrate-driven chemotactic aggregation.

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cells. Depending on the chemical character of released substances, necrotaxis can accumulate or repel cells, which underlines the pathophysiological significance of this phenomenon.

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Lin Y, Pal DS, Banerjee P, Banerjee T, Qin G, Deng Y, et al. (July 2024). "Ras suppression potentiates rear actomyosin contractility-driven cell polarization and migration".

3690:"A multi-scale model of Escherichia coli chemotaxis from intracellular signaling pathway to motility and nutrient uptake in nutrient gradient and isotropic fluid environments" 1702: 1402: 1111:

is a non-eicosanoid metabolite of arachidonic acid made by cyclooxygenase 1 or cyclooxygenase 2 that stimulates leukocyte chemotaxis though the leukotriene B4 receptor, BLT2.

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Köhidai L, Csaba G (July 1998). "Chemotaxis and chemotactic selection induced with cytokines (IL-8, RANTES and TNF-alpha) in the unicellular Tetrahymena pyriformis".

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modernized Pfeffer's capillary assay and represented a significant turning point in understanding the whole process of intracellular signal transduction of bacteria.

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Chemotaxis refers to the directional migration of cells in response to chemical gradients; several variations of chemical-induced migration exist as listed below.

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infections. After leaving nearby blood vessels, these cells recognize chemicals produced by bacteria in a cut or scratch and migrate "toward the smell".

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is also used to designate a technique that separates eukaryotic or prokaryotic cells according to their chemotactic responsiveness to selector ligands.

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Mechanisms concerning chemorepellents are less known than chemoattractants. Although chemorepellents work to confer an avoidance response in organisms,

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Zhao X, Palacci H, Yadav V, Spiering MM, Gilson MK, Butler PJ, et al. (March 2018). "Substrate-driven chemotactic assembly in an enzyme cascade".

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Kedrin D, van Rheenen J, Hernandez L, Condeelis J, Segall JE (September 2007). "Cell motility and cytoskeletal regulation in invasion and metastasis".

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Clockwise rotation breaks the flagella bundle apart such that each flagellum points in a different direction, causing the bacterium to tumble in place.

3493:"The two-component signaling pathway of bacterial chemotaxis: a molecular view of signal transduction by receptors, kinases, and adaptation enzymes" 4312:

Kutscher B, Devreotes P, Iglesias PA (February 2004). "Local excitation, global inhibition mechanism for gradient sensing: an interactive applet".

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It has also been shown that both prokaryotic and eukaryotic cells are capable of chemotactic memory. In prokaryotes, this mechanism involves the

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is the kinetics/source term for the chemo-attractant, and the diffusion coefficients for cell density and the chemo-attractant are respectively

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Gharasoo M, Centler F, Fetzer I, Thullner M (2014). "How the chemotactic characteristics of bacteria can determine their population patterns".

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are unable to choose the direction in which they swim, and are unable to swim in a straight line for more than a few seconds due to rotational

2771:"Interactions of the complement system with endotoxic lipopolysaccharide. Generation of a factor chemotactic for polymorphonuclear leukocytes" 5822:

Guha R, Mohajerani F, Collins M, Ghosh S, Sen A, Velegol D (November 2017). "Chemotaxis of Molecular Dyes in Polymer Gradients in Solution".

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Cluzel P, Surette M, Leibler S (March 2000). "An ultrasensitive bacterial motor revealed by monitoring signaling proteins in single cells".

2744: 561:; however, sensing of chemical gradients is still a crucial step in the process. Due to their small size and other biophysical constraints, 93:

during injury or infection). In addition, it has been recognized that mechanisms that allow chemotaxis in animals can be subverted during

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In general, eukaryotic cells sense the presence of chemotactic stimuli through the use of 7-transmembrane (or serpentine) heterotrimeric

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organisms direct their movements according to certain chemicals in their environment. This is important for bacteria to find food (e.g.,

2275: 589: 514: 263:, is conserved among all flagellated bacteria. Vertebrates seem to have taken advantage of this fact by possessing an immune receptor ( 179: 6335: 969:, which elicits adhesion, chemotaxis, and aggregation of leukocytes. The chemoattractant action of LTB4 is induced via either of two 543: 5726:

Mohajerani F, Zhao X, Somasundar A, Velegol D, Sen A (October 2018). "A Theory of Enzyme Chemotaxis: From Experiments to Modeling".

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Other environmental effects possessing direct or indirect influence on the migration (lighting, temperature, magnetic fields, etc.)

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Counter-clockwise rotation aligns the flagella into a single rotating bundle, causing the bacterium to swim in a straight line; and

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Sengupta S, Dey KK, Muddana HS, Tabouillot T, Ibele ME, Butler PJ, et al. (January 2013). "Enzyme molecules as nanomotors".

473: 3414:"A census of membrane-bound and intracellular signal transduction proteins in bacteria: bacterial IQ, extroverts and introverts" 2818:

Adler J, Tso WW (June 1974). ""Decision"-making in bacteria: chemotactic response of Escherichia coli to conflicting stimuli".

1434: 6148: 6059: 6040: 6021: 5982: 5903: 5493: 5093: 5056: 4014: 3472: 3344: 3108: 1122: 855:, we can determine whether a still-uncharacterized molecule acts via the long- or the short-term receptor pathway. The term 392:

create chemical concentration gradients that organisms, prokaryotic and eukaryotic, move toward or away from, respectively.

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Assay systems applied to evaluate chemotaxis (see incubation times, development, and stability of concentration gradients)

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also contributed to the study of the field during 1882 to 1886, with investigations of the process as an initial step of

624:) a large group of cells—considered previously to be fixed into tissues—are also motile in special physiological (e.g., 535:. These organisms avoid these molecules by producing avoiding reactions to re-orient themselves away from the gradient. 6086: 5552: 5394:"Stimulating properties of 5-oxo-eicosanoids for human monocytes: synergism with monocyte chemotactic protein-1 and -3" 6298: 5892:"Bacterial Chemotaxis Depends on a Two-Component Signaling Pathway Activated by Histidine-Kinase-associated Receptors" 451:

the binding of chemoattractants to MCPs inhibit CheA and therefore CheY-P activity, resulting in smooth runs, but for

6175: 4924: 3576: 2892: 282: 2689: 877: 6538: 1107: 331: 134:, a Caltech lecture regarding chemotaxis propounds that 'erudite description of chemotaxis was only first made by 3997:

Köhidai L (2016). "Chemotaxis as an Expression of Communication of Tetrahymena". In Witzany G, Nowacki M (eds.).

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Roberts B, Chung E, Yu SH, Li SZ, et al. (Mathematical Method of Bioengineering Group Presentation) (2012).

2390:"An excitable Ras/PI3K/ERK signaling network controls migration and oncogenic transformation in epithelial cells" 1071: 335: 214:

The directions of rotation are given for an observer outside the cell looking down the flagella toward the cell.

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Miller LD, Russell MH, Alexandre G (2009). "Diversity in bacterial chemotactic responses and niche adaptation".

1237: 1187: 1005: 970: 698: 6328: 6195:"Design and diversity in bacterial chemotaxis: a comparative study in Escherichia coli and Bacillus subtilis" 5596: 4473:

Köhidai L (1999). "Chemotaxis: the proper physiological response to evaluate phylogeny of signal molecules".

1712: 1709: 989: 867: 5480:. Interdisciplinary Applied Mathematics. Vol. 17 (3rd ed.). New York: Springer. pp. 395–417. 4999:"Antagonists of chemoattractants reveal separate receptors for cAMP, folic acid and pterin in Dictyostelium" 681:

of eukaryotic cells can also produce chemotaxis; in this case, it is mainly a Ca-dependent induction of the

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to the discovery of C5a, a major chemotactic factor involved in acute inflammation. The pioneering works of

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Berg HC, Brown DA (October 1972). "Chemotaxis in Escherichia coli analysed by Three-dimensional Tracking".

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with relatively straight swims interrupted by random tumbles that reorient the bacterium. Bacteria such as

100:, and the aberrant change of the overall property of these networks, which control chemotaxis, can lead to 5877: 1125:). The receptor or other mechanism by which this metabolite stimulates chemotaxis has not been elucidated. 995: 270:

As in many instances in biology, there are bacteria that do not follow this rule. Many bacteria, such as

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Eukaryotic cells are much larger than prokaryotes and have receptors embedded uniformly throughout the

346: 1678: 1384: 1140: 1025:, which like the receptors for leukotriene B4, is a G protein-coupled receptor. Aside from the skin, 661:

gradients, which results in a gradient and the activation of a signaling pathway, culminating in the

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Migration (e.g., basic differences of bacterial swimming, movement of unicellular eukaryotes with

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Although migration of cells was detected from the early days of the development of microscopy by

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Concentration gradients can develop relatively quickly and persist for a long time in the system

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interactions vary with the concentration of the ligand. Investigations of ligand families (e.g.

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The overall movement of a bacterium is the result of alternating tumble and swim phases, called

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chemotaxis occurs if the movement is toward a higher concentration of the chemical in question;

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The proteins CheW and CheA bind to the receptor. The absence of receptor activation results in

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Sozzani S, Zhou D, Locati M, Bernasconi S, Luini W, Mantovani A, et al. (November 1996).

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Sourjik V (December 2004). "Receptor clustering and signal processing in E. coli chemotaxis".

3285:"Flagellin: a unique microbe-associated molecular pattern and a multi-faceted immunomodulator" 1738: 1364: 965:(also termed 5-lipoxygenase). Their most prominent member with chemotactic factor activity is 73:). In multicellular organisms, chemotaxis is critical to early development (e.g., movement of 6523: 5620: 5073: 1147: 852: 223: 4667:"Actuation of single downstream nodes in growth factor network steers immune cell migration" 1542:

is often not constant, but a decreasing function of the chemo-attractant. For some quantity

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Becker EL (October 1977). "Stimulated neutrophil locomotion: chemokinesis and chemotaxis".

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embodies a special type of chemotaxis when the chemoattractant molecules are released from

733: 226:. As a result, the trajectory of a bacterium swimming in a uniform environment will form a 54: 4825:"Social senses: G-protein-coupled receptor signaling pathways in Dictyostelium discoideum" 4665:

Pal DS, Banerjee T, Lin Y, de Trogoff F, Borleis J, Iglesias PA, et al. (July 2023).

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Wadhams GH, Armitage JP (December 2004). "Making sense of it all: bacterial chemotaxis".

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Biological characteristics of the ligands (attractant, neutral, and repellent molecules)

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takes the phosphoryl group from CheA. This mechanism of signal transduction is called a

151: 6264: 6239: 6122: 6097: 5956: 5921: 5761: 5735: 5673: 5632: 5570: 5423: 5334: 5307: 5283: 5258: 5234: 5209: 5178: 5154:"Ability of polymorphonuclear leukocytes to orient in gradients of chemotactic factors" 5153: 5134: 5029: 4974: 4949: 4889: 4805: 4584: 4541: 4498: 4450: 4415: 4391: 4356: 4337: 4289: 4254: 4227: 4202: 4183: 4128: 4095: 4064: 4031: 3974: 3949: 3925: 3898: 3625: 3517: 3492: 3440: 3413: 3394: 3309: 3284: 3260: 3233: 3150: 3125: 3076: 3051: 3032: 2952: 2917: 2898: 2851: 2795: 2770: 2654: 2619: 2597: 2512: 2487: 2463: 2438: 2414: 2389: 2365: 2341:"Cell motility in cancer invasion and metastasis: insights from simple model organisms" 2340: 2316: 2291: 1718: 1589: 1485: 1276: 1267: 800: 431:

CheY-P can then control flagellar rotation influencing the direction of cell motility.

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are activated. The Che proteins alter the tumbling frequency, and alter the receptors.

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Skoge M, Yue H, Erickstad M, Bae A, Levine H, Groisman A, et al. (October 2014).

4055: 3874: 3839: 3810: 3785: 3758: 3733: 3209: 3174: 2870: 407:(MCP). MCPs in E.coli include Tar, Tsr, Trg and Tap. Chemoattracttants to Trg include 6269: 6226: 6181: 6171: 6144: 6127: 6082: 6055: 6036: 6017: 5978: 5961: 5899: 5839: 5804: 5753: 5708: 5636: 5624: 5574: 5489: 5450: 5415: 5374: 5339: 5288: 5239: 5183: 5126: 5089: 5052: 5021: 5017: 4979: 4930: 4920: 4881: 4877: 4846: 4797: 4754: 4727: 4696: 4647: 4619: 4576: 4533: 4502: 4490: 4455: 4396: 4329: 4294: 4232: 4187: 4175: 4133: 4069: 4010: 3979: 3930: 3879: 3815: 3763: 3670: 3617: 3572: 3522: 3508: 3468: 3445: 3398: 3386: 3340: 3314: 3265: 3214: 3155: 3104: 3081: 3024: 2957: 2888: 2843: 2800: 2659: 2589: 2553: 2517: 2468: 2419: 2388:

Zhan H, Bhattacharya S, Cai H, Iglesias PA, Huang CH, Devreotes PN (September 2020).

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Yokomizo T (February 2015). "Two distinct leukotriene B4 receptors, BLT1 and BLT2".

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Solnica-Krezel L, Sepich DS (2012). "Gastrulation: making and shaping germ layers".

4545: 4357:"Cells navigate with a local-excitation, global-inhibition-biased excitable network" 3786:"Repellent response functions of the Trg and Tap chemoreceptors of Escherichia coli" 2902: 2601: 2114:

Migration of cells is free toward and away on the axis of the concentration gradient

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Kuruvilla H, Schmidt B, Song S, Bhajjan M, Merical M, Alley C, et al. (2016).

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substances possessing chemotaxis-inducer effect in motile cells. These chemotactic

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Several mathematical models of chemotaxis were developed depending on the type of

65:) by swimming toward the highest concentration of food molecules, or to flee from 6211: 5410: 5393: 5225: 4682: 4615: 3569:

An Introductory Text to Bioengineering (Advanced Series in Biomechanics - Vol. 4)

3103:(Expanded, rev. ed.). Princeton, NJ: Princeton Univ. Press. pp. 83–94. 2620:"Chemotactic movement of a polarity site enables yeast cells to find their mates" 2585: 2405: 2085: 1280: 1251: 1163: 905: 323: 301: 139: 5749: 5085: 4158:

Vladimirov N, Sourjik V (November 2009). "Chemotaxis: how bacteria use memory".

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which stimulates leukocyte chemotaxis through the leukotriene B4 receptor, BLT2.

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