- Author:
- pmr2.import <nobody@models.cellml.org>
- Date:
- 2006-07-09 07:57:31+12:00
- Desc:
- committing version01 of sarkar_lauffenburger_2003
- Permanent Source URI:
- http://models.cellml.org/workspace/sarkar_lauffenburger_2003/rawfile/c13296304afef77323430c1340d7e12e90a4032f/sarkar_lauffenburger_2003.cellml
<?xml version='1.0' encoding='utf-8'?>
<!-- FILE : sarkar_model_2003.xml
CREATED : 2nd October 2003
LAST MODIFIED : 27th April 2005
AUTHOR : Catherine Lloyd
Bioengineering Institute
The University of Auckland
MODEL STATUS : This model conforms to the CellML 1.0 Specification released on
10th August 2001, and the 16/1/02 CellML Metadata 1.0 Specification.
DESCRIPTION : This file contains a CellML description of Sarkar and Lauffenburger's 2003 computational model of GCSF endocytic trafficking dynamics.
CHANGES:
27/04/2005 - PJV - Corrected syntax error with base_units. Removed
unnecessary type. Changed initial values to make
them valid cellml.
--><model xmlns="http://www.cellml.org/cellml/1.0#" xmlns:cmeta="http://www.cellml.org/metadata/1.0#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bqs="http://www.cellml.org/bqs/1.0#" xmlns:cellml="http://www.cellml.org/cellml/1.0#" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:vCard="http://www.w3.org/2001/vcard-rdf/3.0#" cmeta:id="sarkar_lauffenburger_2003_version01" name="sarkar_lauffenburger_2003_version01">
<documentation xmlns="http://cellml.org/tmp-documentation">
<article>
<articleinfo>
<title>Computational Model of GCSF Endocytic Trafficking Dynamics</title>
<author>
<firstname>Catherine</firstname>
<surname>Lloyd</surname>
<affiliation>
<shortaffil>Bioengineering Institute, University of Auckland</shortaffil>
</affiliation>
</author>
</articleinfo>
<section id="sec_status">
<title>Model Status</title>
<para>
This is the original unchecked version of the model imported from the previous
CellML model repository, 24-Jan-2006.
</para>
</section>
<sect1 id="sec_structure">
<title>Model Structure</title>
<para>
Currently, drug design and development takes, on average, 12 years and costs more than 800 million US dollars. Much of this time and money is spent on experiments and drugs that fail. There is very little mechanistic understanding as to how the various levels of biological complexity - from molecular interactions, to cellular function, to tissue organisation, to whole organs and beyond - are integrated. Hierarchical mathematical models provide a method for integrating this data. Specifically, in the model described here, Sarkar and Lauffenburger focus on the case of granulocyte colony-stimulating factor (GCSF).
</para>
<para>
GCSF is of great clinical importance, especially for cancer patients undergoing chemotherapy. The drug is injected into the blood stream where it then diffuses to the bone marrow and binds to its receptor GCSFR on precursor cells, inducing them to replicate and differentiate into mature neutrophils. In this way, the neutrophil count of immunocompromised patients is significantly increased. However, the bone marrow precursor cells engulf and degrade the GCSF, a negative feedback mechanism that reduces its potency. In addition, mature bone cells express the receptor GCSFR, and they bind, engulf and degrade the drug from the bloodstream. Thus, there is a significant negative feedback loop that reduces the lifetime of the drug.
</para>
<para>
The mathematical model developed by Sarkar and Lauffenburger relates extracellular GCSF depletion to the molecular properties of the ligand and the cells expressing the GCSF receptor (see <xref linkend="fig_reaction_diagram"/> below). The authors then further integrated this cell-level model into a physiologically relevant pharmacokinetic/pharmacodynamic model.
</para>
<para>
The model has been described here in CellML (the raw CellML description of the Sarkar and Lauffenburger 2003 model can be downloaded in various formats as described in <xref linkend="sec_download_this_model"/>).
</para>
<para>
The complete original paper reference is cited below:
</para>
<para>
<ulink url="http://molpharm.aspetjournals.org/cgi/content/abstract/63/1/147">Cell-Level Pharmacokinetic Model of Granulocyte Colony-Stimulating Factor: Implications for Ligand Lifetime and Potency in Vivo</ulink>, Casim A. Sarkar and Douglas A. Lauffenburger, 2003, <ulink url="http://molpharm.aspetjournals.org/">
<emphasis>Molecular Pharmacology</emphasis>
</ulink>, 63, 147-158. (<ulink url="http://molpharm.aspetjournals.org/cgi/content/full/63/1/147">Full text (HTML)</ulink> and <ulink url="http://molpharm.aspetjournals.org/cgi/reprint/63/1/147.pdf">PDF</ulink> versions of the article are available on the <emphasis>Molecular Pharmacology</emphasis> website.) <ulink url="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12488547&dopt=Abstract">PubMed ID: 12488547</ulink>
</para>
<informalfigure float="0" id="fig_reaction_diagram">
<mediaobject>
<imageobject>
<objectinfo>
<title>reaction diagram</title>
</objectinfo>
<imagedata fileref="sarkar_2003.png"/>
</imageobject>
</mediaobject>
<caption>Cell-level trafficking model for the GCSF/GCSFR system.</caption>
</informalfigure>
</sect1>
</article>
</documentation>
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Cell-Level Pharmacokinetic Model of Granulocyte Colony-Stimulating
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