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                <title xml:lang="en">Stage- and region-specific expression of estrogen receptor alpha isoforms during ontogeny of the pituitary gland.</title>
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                    <surname>Vincent</surname>
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                <title level="j">Endocrinology</title>
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              <classCode scheme="mesh">Age Factors</classCode>
              <classCode scheme="mesh">Alternative Splicing</classCode>
              <classCode scheme="mesh">RNA, Messenger</classCode>
              <classCode scheme="mesh">Rats</classCode>
              <classCode scheme="mesh">Rats, Wistar</classCode>
              <classCode scheme="mesh">Receptors, Estrogen</classCode>
              <classCode scheme="mesh">Animals</classCode>
              <classCode scheme="mesh">Animals, Newborn</classCode>
              <classCode scheme="mesh">COS Cells</classCode>
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              <p>The expression time course of estrogen receptor alpha (ER alpha) was analyzed by RT-PCR in fetal and newborn rat pituitaries. In addition to the classical ER alpha messenger RNA (mRNA), three shorter transcripts were detected and subsequently cloned. Sequence analysis showed that they corresponded to ER alpha mRNAs lacking exon 3 (which encodes a zinc finger in the DNA-binding domain), exon 4 (which encodes the nuclear localization signal and part of the steroid-binding domain), or both exons 3 and 4. As analyzed by RT-PCR and ribonuclease protection assay, the respective expression levels of the different transcripts varied dramatically during pituitary development; short forms appeared 4 days before full-length ER alpha mRNA. On Western blots from rat pituitaries of different ages, an ER alpha-specific antiserum labeled four protein bands of the expected molecular weights, revealing that all four ER alpha mRNAs are translated in vivo. Immunocytochemistry, using the same antiserum, showed the ER alpha to be present first in the cytosol of intermediate lobe cells (around embryonic day 16). Only 5 days later, nuclear staining became detectable in the anterior lobe. We argue that the observed cytosolic staining will be essentially due to short ER alpha isoforms, which are indeed more abundantly expressed in the intermediate lobe. These data suggest that during pituitary development, the activity of the ER alpha might be specifically regulated by differential splicing of its primary transcript, resulting in a differential subcellular localization of the isoforms.</p>
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