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<title>UTas ePrints - Working to identify an exciting steroid in a viviparous skink, Tiliqua nigrolutea</title>
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<meta content="Edwards, Ashley" name="eprints.creators_name" />
<meta content="Jones, Susan M." name="eprints.creators_name" />
<meta content="Davies, N.W." name="eprints.creators_name" />
<meta content="Ashley.Edwards@utas.edu.au" name="eprints.creators_id" />
<meta content="S.M.Jones@utas.edu.au" name="eprints.creators_id" />
<meta content="Noel.Davies@utas.edu.au" name="eprints.creators_id" />
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<meta content="17-beta-estradiol (E2) is broadly believed to be the major circulating form of estrogen in almost all vertebrates. Its role in the stimulation of vitellogenesis in females is well established, and the assumption is that E2 stimulates other physiological and behavioural processes related, in particular, to reproduction. During incubation studies into steroid biosynthetic pathway preference in blue-tongued lizards, Tiliqua nigrolutea, we noted that while E2 was not produced, an alternative, highly polar steroid was synthesised in significant quantities. We have investigated this steroid further, using in vitro incubation with various steroid precursors, with products identified by a combination of TLC, HPLC with radiometric detection, UV spectrum comparisons and preliminary GC-MS. We know the steroid is more polar than E2, but less polar than estriol (E3). It is synthesised from pregnenolone (P5), probably via testosterone (T), but is not synthesised from androstenedione (AD). Gonadal production of this polar steroid varies with sex and reproductive condition: greater production is seen in both sexes during the spring reproductive period (greatest in vitellogenic females). We believe that this polar steroid is an alternative to E2 and could have important roles in reproductive physiology in this species." name="eprints.abstract" />
<meta content="2003-12" name="eprints.date" />
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<meta content="Edwards, Ashley and Jones, Susan M. and Davies, N.W. (2003) Working to identify an exciting steroid in a viviparous skink, Tiliqua nigrolutea. In: ANZSCPB, Hobart, Tasmania, Australia. (Unpublished)" name="eprints.citation" />
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<meta content="Davies, N.W." name="DC.creator" />
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<meta content="17-beta-estradiol (E2) is broadly believed to be the major circulating form of estrogen in almost all vertebrates. Its role in the stimulation of vitellogenesis in females is well established, and the assumption is that E2 stimulates other physiological and behavioural processes related, in particular, to reproduction. During incubation studies into steroid biosynthetic pathway preference in blue-tongued lizards, Tiliqua nigrolutea, we noted that while E2 was not produced, an alternative, highly polar steroid was synthesised in significant quantities. We have investigated this steroid further, using in vitro incubation with various steroid precursors, with products identified by a combination of TLC, HPLC with radiometric detection, UV spectrum comparisons and preliminary GC-MS. We know the steroid is more polar than E2, but less polar than estriol (E3). It is synthesised from pregnenolone (P5), probably via testosterone (T), but is not synthesised from androstenedione (AD). Gonadal production of this polar steroid varies with sex and reproductive condition: greater production is seen in both sexes during the spring reproductive period (greatest in vitellogenic females). We believe that this polar steroid is an alternative to E2 and could have important roles in reproductive physiology in this species." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Working to identify an exciting steroid in a viviparous skink, Tiliqua nigrolutea</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Edwards, Ashley</span> and <span class="person_name">Jones, Susan M.</span> and <span class="person_name">Davies, N.W.</span> (2003) <xhtml:em>Working to identify an exciting steroid in a viviparous skink, Tiliqua nigrolutea.</xhtml:em> In: ANZSCPB, Hobart, Tasmania, Australia. (Unpublished)</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_673' );" href="http://eprints.utas.edu.au/661/1/Hobart_poster.pdf" onmouseout="EPJS_HidePreview( event, 'doc_preview_673' );"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a><div class="ep_preview" id="doc_preview_673"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/661/thumbnails/1/preview.png" class="ep_preview_image" border="0" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/661/1/Hobart_poster.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />81Kb</td></tr></table><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">17-beta-estradiol (E2) is broadly believed to be the major circulating form of estrogen in almost all vertebrates. Its role in the stimulation of vitellogenesis in females is well established, and the assumption is that E2 stimulates other physiological and behavioural processes related, in particular, to reproduction. During incubation studies into steroid biosynthetic pathway preference in blue-tongued lizards, Tiliqua nigrolutea, we noted that while E2 was not produced, an alternative, highly polar steroid was synthesised in significant quantities. We have investigated this steroid further, using in vitro incubation with various steroid precursors, with products identified by a combination of TLC, HPLC with radiometric detection, UV spectrum comparisons and preliminary GC-MS. We know the steroid is more polar than E2, but less polar than estriol (E3). It is synthesised from pregnenolone (P5), probably via testosterone (T), but is not synthesised from androstenedione (AD). Gonadal production of this polar steroid varies with sex and reproductive condition: greater production is seen in both sexes during the spring reproductive period (greatest in vitellogenic females). We believe that this polar steroid is an alternative to E2 and could have important roles in reproductive physiology in this species.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Conference or Workshop Item (Poster)</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">conference poster</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270604.html">270000 Biological Sciences > 270600 Physiology > 270604 Comparative Physiology</a><br /><a href="http://eprints.utas.edu.au/view/subjects/270603.html">270000 Biological Sciences > 270600 Physiology > 270603 Animal Physiology - Systems</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">661</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Ashley Edwards</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">24 Jan 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=661;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=661">item control page</a></p>
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