Rendering of the source text

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This CellML file was generated on 23/03/2010 at 3:09:57 at p.m. using:

COR (0.9.31.1207)
Copyright 2002-2010 Dr Alan Garny
http://COR.physiol.ox.ac.uk/ - COR@physiol.ox.ac.uk

CellML 1.0 was used to generate this model
http://www.CellML.org/
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			<articleinfo>
				<title>Response to continuous and pulsatile PTH dosing: a mathematical model for parathyroid hormone receptor kinetics</title>
				<author>
					<firstname>Catherine</firstname>
					<surname>Lloyd</surname>
					<affiliation>
						<shortaffil>Auckland Bioengineering Institute, The University of Auckland</shortaffil>
					</affiliation>
				</author>
			</articleinfo>
			<section id="sec_status">
				<title>Model Status</title>
				<para>
        This CellML version of the model has been checked in COR and OpenCell.  The units have been checked and are correct and are consistent.  The model runs in COR and Opencell to it recreate the published results. This model recreates continuous PTH dosing model using low doses.</para>
			</section>
			<sect1 id="sec_structure">
				<title>Model Structure</title>
				<para>
ABSTRACT: In this paper, we propose a mathematical model for parathyroid hormone receptor (PTH1R) kinetics, focusing on the receptor's response to PTH dosing to discern bone formation responses from bone resorption. The PTH1R is a major target for new osteoporosis treatments, as pulsatile PTH dosing has been shown to induce net bone formation in both animals and humans, and PTH(1-34) was recently FDA approved for the treatment of post-menopausal osteoporosis. PTH has also been shown to cause net bone loss when given continuously, so that the net action of PTH on bone is dependent on the dosing pattern. We have developed a simplified two-state receptor kinetics model for the PTH1R, based on the concepts of Segel et al., to distinguish the activity of active and inactive receptor and receptor-ligand complexes. The goal is to develop a plausible model of the minimal essential biological relationships necessary for understanding the responses to PTH dosing. A two-state model is able to effectively discriminate between continuous and pulsatile PTH dosing using the active species as surrogates for the downstream anabolic response. For continuous PTH dosing, the model predicts a desensitized system dominated by the inactive receptor and complex, consistent with downstream net bone loss that has been demonstrated experimentally. Using pulsatile PTH dosing, the model system predicts a highly sensitized state dominated by the active receptor and complex, corresponding to net bone formation. These results are consistent with the hypothesis that the kinetics of the receptor plays a critical role in the downstream effects of PTH dosing. Moreover, these results indicate that within a range of biologically relevant PTH doses, the two-state model is able to capture the differential behavior of the system for both continuous and pulsatile PTH dosing. The development of such a model provides a rational basis for developing more biologically extensive models that may support the design of optimal dosing strategies for PTH-based anti-osteoporosis treatments. Moreover, this model provides a unique starting point from which to design experiments investigating PTH receptor biology.
</para>
				
				<informalfigure float="0" id="fig_reaction_diagram">
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								<title>model diagram</title>
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					<caption>Schematic diagram of the two-state model for PTHR1 binding kinetics  PTH is secreted and/or dosed at a rate D and binds to the active (Ra) and inactive (Ri) forms of the receptor.  PTH-PTHR1 binding results in the formation of the active (Ca) and inactive (Ci) complexes.  In addition, there is a conversion between the active and inactive forms of the receptor and complexes, while unbound PTH is cleared from the system.</caption>
				</informalfigure>
				
				<para>
The original paper reference is cited below:
</para>
				<para>
Response to continuous and pulsatile PTH dosing: a mathematical model for parathyroid hormone receptor kinetics, Laura K. Potter, Larry D. Greller, Carolyn R. Cho, Mark E. Nuttall, George B. Stroup, Larry J. Suva, and Frank L. Tobin, 2005, <emphasis>Bone</emphasis>, 37, 159-169.  <ulink url="http://www.ncbi.nlm.nih.gov/pubmed/15921971">PubMed ID: 15921971</ulink>
				</para>
				
			</sect1>
		</article>
	</documentation>
	
	
	
	
	
	
	
	   
	
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        Potter et al's 2005 mathematical model for parathyroid hormone receptor kinetics.
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xmlns="http://purl.org/dc/terms/" xml:lang="en">inactive parathyroid hormone-parathyroid hormone Type 1 receptor</alternative><alternative xmlns="http://purl.org/dc/terms/" xml:lang="en">inactive PTH-PTH1R complex</alternative></rdf:Description><rdf:Description rdf:about="rdf:#684b35ff-660e-4116-b99f-3f61927cf031"><title xmlns="http://purl.org/dc/elements/1.1/" xml:lang="en">Response to continuous and pulsatile PTH dosing: a mathematical model for parathyroid hormone receptor kinetics</title><creator xmlns="http://purl.org/dc/elements/1.1/"><rdf:Description rdf:about="rdf:#538ba590-77a7-459f-8618-e29fb6ead251"/></creator><volume xmlns="http://www.cellml.org/bqs/1.0#" xml:lang="en">37</volume><last_page xmlns="http://www.cellml.org/bqs/1.0#" xml:lang="en">169</last_page><Journal xmlns="http://www.cellml.org/bqs/1.0#"><rdf:Description rdf:about="rdf:#76718c80-09bc-4978-aaa4-bc12279dbae4"/></Journal><first_page xmlns="http://www.cellml.org/bqs/1.0#" xml:lang="en">159</first_page><issued 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	  <dc:title>This model recreates continuous PTH dosing model using low doses</dc:title>
	  
	  <publisher xmlns="http://purl.org/dc/elements/1.1/" xml:lang="en">The University of Auckland, Auckland Bioengineering Institute</publisher><created xmlns="http://purl.org/dc/terms/"><rdf:Description rdf:about="rdf:#15ea001b-8e94-4d85-bdbc-bbbd1e8755a7"/></created><creator xmlns="http://purl.org/dc/elements/1.1/"><rdf:Description rdf:about="rdf:#b050c927-15d4-4342-9a16-95cceda067c0"/></creator><cmeta:comment><rdf:Description rdf:about="rdf:#e2e4e4cb-ff27-4aaf-b154-7bc9e8ccc10b"/></cmeta:comment></rdf:Description><rdf:Description rdf:about="rdf:#b845eb18-3c70-4e7f-8357-2e0cc8c99f1c"><JournalArticle xmlns="http://www.cellml.org/bqs/1.0#"><rdf:Description rdf:about="rdf:#684b35ff-660e-4116-b99f-3f61927cf031"/></JournalArticle><Pubmed_id xmlns="http://www.cellml.org/bqs/1.0#" xml:lang="en">15921971</Pubmed_id></rdf:Description><rdf:Description rdf:about="rdf:#76df011e-c390-4cc6-946f-cf70c87f2584"><N xmlns="http://www.w3.org/2001/vcard-rdf/3.0#"><rdf:Description rdf:about="rdf:#0de6dbcd-2d16-4312-bd6e-806649eee6f7"/></N><rdf:type><rdf:Description rdf:about="http://www.cellml.org/bqs/1.0#Person"/></rdf:type></rdf:Description><rdf:Description rdf:about="rdf:#a9c2a7d9-3251-4e65-adac-c2c58cc8b351"><subject_type xmlns="http://www.cellml.org/bqs/1.0#" xml:lang="en">keyword</subject_type><rdf:value><rdf:Description rdf:about="rdf:#a6198dfd-5c18-443a-98c0-4f702b4b14a8"/></rdf:value></rdf:Description><rdf:Description rdf:about="rdf:#65af3c19-8e1e-4f86-ae54-ee9604f3e065"><Family xmlns="http://www.w3.org/2001/vcard-rdf/3.0#" xml:lang="en">Cho</Family><Other xmlns="http://www.w3.org/2001/vcard-rdf/3.0#" xml:lang="en">R</Other><Given xmlns="http://www.w3.org/2001/vcard-rdf/3.0#" xml:lang="en">Carolyn</Given></rdf:Description><rdf:Description rdf:about="rdf:#94293cf0-b171-4cba-b4fb-a06e79454ce0"><W3CDTF xmlns="http://purl.org/dc/terms/" xml:lang="en">2005-08-00 00:00</W3CDTF></rdf:Description><rdf:Description rdf:about="rdf:#bd8f3f96-d59d-4336-8174-35ed3961ff02"><N xmlns="http://www.w3.org/2001/vcard-rdf/3.0#"><rdf:Description rdf:about="rdf:#522b5fc1-12ed-40f2-b274-94380706d65b"/></N><rdf:type><rdf:Description rdf:about="http://www.cellml.org/bqs/1.0#Person"/></rdf:type></rdf:Description></rdf:RDF></model>