Dynamics of in silico leukocyte rolling, activation, and adhesion

Tang, Jonathan; Ley, Klaus F; Hunt, C Anthony

doi:10.1186/1752-0509-1-14

BMC Systems Biology

Table 4 Model parameter values for the LEUKOCYTE MEMBRANE and LIGANDS along with corresponding in vitro values

From: Dynamics of in silico leukocyte rolling, activation, and adhesion

Parameter Name	Description		Model Parameter Value	Experimental Value	Reference
LeukTotalWidth	LEUKOCYTE MEMBRANE width (in the y [east-west] dimension)		20 MEMBRANE UNITS	Avg. Human Leukocyte Diameters (μm): Lymphocyte: 6.2; Neutrophil: 7; Monocyte: 7.5	[48]
LeukTotalLength	LEUKOCYTE MEMBRANE length (in the x [north-south] dimension)		30 MEMBRANE UNITS
LeukExposedWidth	CONTACT ZONE width (in the y dimension)		8 MEMBRANE UNITS	NA	NA
LeukExposedLength	CONTACT ZONE length (in the x dimension)		10 MEMBRANE UNITS	NA	NA
PSGL1DensityMean ± PSGL1DensitySTDev	Mean number of PSGL-1 molecules (± SD) represented by each PSGL1 agent	Experiment 1: Neutrophils	150 ± 5^a molecules	~18,000/Human Neutrophil	[54]
		Experiment 3: Monocytes	150 ± 5^b molecules	N/A	N/A
VLA4DensityMean ± VLA4DensitySTDev	Mean number of VLA-4 molecules (± SD) represented by each VLA4 agent	Experiment 2: T-lymphocytes	45 ± 5 molecules	3,000/Human T-Lymphocyte	[55]
		Experiment 3: Monocytes	60 ± 5 molecules	6,000/Human Monocyte
CXCR2DensityMean ± CXCR2DensitySTDev	Number of CXCR-2 molecules (± standard deviation) represented by each CXCR2 agent		1 ± 0 molecules	NA	NA
VLA4MaxPercHighAff	Maximum percent of VLA-4 integrins on the leukocyte membrane that can be induced into a high affinity state^c		12.5%	10%	[49]
Pon (PSGL1-PSELECTIN1)	Probability of forming a PSGL1-PSELECTIN1 BOND		0.001	NA^d	[56]
Pon (LOW AFFINITY VLA4-VCAM1)	Probability of forming a LOW AFFINITY VLA4-VCAM1 BOND		0.001	NA^d	[55]
Pon (HIGH AFFINITY VLA4-VCAM1)	Probability of forming a HIGH AFFINITY VLA4-VCAM1 BOND		0.005	NA^d	[55]
Pon (CXCR2-GROA)	Probability of forming a CXCR2-GROA BOND		1.0^c	NA	NA
Poff (CXCR2-GROA)	Probability of breaking a CXCR2-GROA BOND		1.0^c	NA	NA

^a PSGL1DensityMean ± PSGL1DensitySTDev parameter values used for simulating Experiment 1, neutrophil rolling, were originally 25 ± 5. They were changed to the values currently listed to more closely reflect the experimental values of PSGL-1 density reported in the literature. No significant differences were observed when using these new parameter values.
^b Values for PSGL-1 sites/human monocyte were not found in the literature and were assumed to be similar to values reported for human neutrophils.
^c See Methods.
^d Pon and Kon are intended to map to aspects of the same in vitro phenomena. However, there is no direct mapping between these parameters because the parent models belong to fundamentally different classes [57].

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ISSN: 1752-0509

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