Temporal expression of thyroid hormone receptor ?1 in the liver of the lizardPodarcis sicula

✍ Scribed by Virgilio, Francesca ;Sciarrillo, Rosaria ;De Falco, Maria ;Comitato, Raffaella ;Laforgia, Vincenza ;Varano, Lorenzo ;Cardone, Anna

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 165 KB
• Volume: 301A
• Category: Article
• ISSN: 0022-104X
• DOI: 10.1002/jez.a.20031

✦ Synopsis

Abstract

The effects of thyroid hormones on metabolism and development are mediated by thyroid hormone receptors (TRs). To gain a better understanding of the potential role of thyroid hormone receptors in the liver of the lizard Podarcis sicula, we have evaluated the expression of TRs during the more critical periods of the annual variations of thyroid activity. The results obtained have indicated that in the liver of the lizard P. sicula there are three transcripts: mRNA of 5.0 kb for TRα1, mRNA of 2.6 kb for TRα2, and 6.0 kb band, which represent unprocessed heteronuclear RNA, encoding unspliced primary transcripts of RNA prior to their processing into the mature TRα1 and TRα2. By means of slot‐blot, we are able to determine that there is a change in the expression of TRs that occurs in the liver during the annual cycle of thyroid activity. A major expression registers in May, when the lizard thyroid gland shows the maximal activity. The combination of molecular biology with immunohistochemistry revealed that hepatic cells were also TRα IR positive. Particularly intense immunostaining was present in the cell nuclei of animals sacrified in May. These observations suggest that in lizard P. sicula the thyroid hormone (T3) might regulate hepatic activity, modulating TR mRNA levels. J. Exp. Zool. 301A:212–217, 2004. © 2004 Wiley‐Liss, Inc.