Rendering of the source text

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<!--
This CellML file was generated on 23/11/2009 at 4:22:19 at p.m. using:

COR (0.9.31.1333)
Copyright 2002-2009 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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		<article>
			<articleinfo>
				<title>Low dose of dopamine may stimulate prolactin secretion by increasing fast potassium currents</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>
            The authors highlight that the original code they wrote for this model can be downloaded <ulink url="http://www.math.fsu.edu/~bertram/software/pituitary/JCNS_07.ode">here</ulink>.  This particular CellML version of the model has the A-type potassium current switched off.  For the alternative model which has the A-type current switched on and the BK-type potassium current switched off (gBK=0.2). This CellML model runs in PCEnv and COR to replicate the published results (figure 2B).  Please note that the model needs to be run for at least 3000ms to allow the model to reach stability.
          </para>
			</section>	
			<sect1 id="sec_structure">
				<title>Model Structure</title>
				<para>
ABSTRACT: Dopamine (DA) released from the hypothalamus tonically inhibits pituitary lactotrophs. DA (at micromolar concentration) opens potassium channels, hyperpolarizing the lactotrophs and thus preventing the calcium influx that triggers prolactin hormone release. Surprisingly, at concentrations ~1000 lower, DA can stimulate prolactin secretion. Here, we investigated whether an increase in a K+ current could mediate this stimulatory effect. We considered the fast K+ currents flowing through large-conductance BK channels and through A-type channels. We developed a minimal lactotroph model to investigate the effects of these two currents. Both I BK and I A could transform the electrical pattern of activity from spiking to bursting, but through distinct mechanisms. I BK always increased the intracellular Ca2+ concentration, while I A could either increase or decrease it. Thus, the stimulatory effects of DA could be mediated by a fast K+ conductance which converts tonically spiking cells to bursters. In addition, the study illustrates that a heterogeneous distribution of fast K+ conductances could cause heterogeneous lactotroph firing patterns.
</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 model.</caption>
</informalfigure>
				
				<para>
The original paper reference is cited below:
</para>
				<para>
					Low dose of dopamine may stimulate prolactin secretion by increasing fast potassium currents, Joel Tabak, Natalia Toporikova, Marc E. Freeman, and Richard Bertram, 2007,
						<emphasis>Journal of Computational Neuroscience</emphasis>
					, 22, 211-222. <ulink url="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&amp;cmd=Retrieve&amp;dopt=AbstractPlus&amp;list_uids=17058022&amp;query_hl=1&amp;itool=pubmed_docsum">PubMed ID: 17058022</ulink>
				</para>

			</sect1>
		</article>
	</documentation>
	
	
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            Low dose of dopamine may stimulate prolactin secretion by increasing fast potassium currents (BK-Type K Current)
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            Low dose of dopamine may stimulate prolactin secretion by increasing fast potassium currents
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