Abstract
The biological activities of thyroid hormones are thought to be mediated by receptors generated by the TRalpha and TRbeta loci. The existence of several receptor isoforms suggests that different functions are mediated by specific isoforms and raises the possibility of functional redundancies. We have inactivated both TRalpha and TRbeta genes by homologous recombination in the mouse and compared the phenotypes of wild-type, and single and double mutant mice. We show by this method that the TRbeta receptors are the most potent regulators of the production of thyroid stimulating hormone (TSH). However, in the absence of TRbeta, the products of the TRalpha gene can fulfill this function as, in the absence of any receptors, TSH and thyroid hormone concentrations reach very high levels. We also show that TRbeta, in contrast to TRalpha, is dispensable for the normal development of bone and intestine. In bone, the disruption of both TRalpha and TRbeta genes does not modify the maturation delay observed in TRalpha -/- mice. In the ileum, the absence of any receptor results in a much more severe impairment than that observed in TRalpha -/- animals. We conclude that each of the two families of proteins mediate specific functions of triiodothyronin (T3), and that redundancy is only partial and concerns a limited number of functions.
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- Abu E. O., Bord S., Horner A., Chatterjee V. K., Compston J. E. The expression of thyroid hormone receptors in human bone. Bone. 1997 Aug;21(2):137–142. doi: 10.1016/s8756-3282(97)00097-5. [DOI] [PubMed] [Google Scholar]
- Bradley D. J., Towle H. C., Young W. S., 3rd Spatial and temporal expression of alpha- and beta-thyroid hormone receptor mRNAs, including the beta 2-subtype, in the developing mammalian nervous system. J Neurosci. 1992 Jun;12(6):2288–2302. doi: 10.1523/JNEUROSCI.12-06-02288.1992. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Bradley D. J., Young W. S., 3rd, Weinberger C. Differential expression of alpha and beta thyroid hormone receptor genes in rat brain and pituitary. Proc Natl Acad Sci U S A. 1989 Sep;86(18):7250–7254. doi: 10.1073/pnas.86.18.7250. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Chassande O., Fraichard A., Gauthier K., Flamant F., Legrand C., Savatier P., Laudet V., Samarut J. Identification of transcripts initiated from an internal promoter in the c-erbA alpha locus that encode inhibitors of retinoic acid receptor-alpha and triiodothyronine receptor activities. Mol Endocrinol. 1997 Aug;11(9):1278–1290. doi: 10.1210/mend.11.9.9972. [DOI] [PubMed] [Google Scholar]
- Feng P., Li Q. L., Satoh T., Wilber J. F. Ligand (T3) dependent and independent effects of thyroid hormone receptors upon human TRH gene transcription in neuroblastoma cells. Biochem Biophys Res Commun. 1994 Apr 15;200(1):171–177. doi: 10.1006/bbrc.1994.1430. [DOI] [PubMed] [Google Scholar]
- Flamant F., Samarut J. Involvement of thyroid hormone and its alpha receptor in avian neurulation. Dev Biol. 1998 May 1;197(1):1–11. doi: 10.1006/dbio.1998.8872. [DOI] [PubMed] [Google Scholar]
- Forrest D., Hallbök F., Persson H., Vennström B. Distinct functions for thyroid hormone receptors alpha and beta in brain development indicated by differential expression of receptor genes. EMBO J. 1991 Feb;10(2):269–275. doi: 10.1002/j.1460-2075.1991.tb07947.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Forrest D., Hanebuth E., Smeyne R. J., Everds N., Stewart C. L., Wehner J. M., Curran T. Recessive resistance to thyroid hormone in mice lacking thyroid hormone receptor beta: evidence for tissue-specific modulation of receptor function. EMBO J. 1996 Jun 17;15(12):3006–3015. [PMC free article] [PubMed] [Google Scholar]
- Forrest D., Sjöberg M., Vennström B. Contrasting developmental and tissue-specific expression of alpha and beta thyroid hormone receptor genes. EMBO J. 1990 May;9(5):1519–1528. doi: 10.1002/j.1460-2075.1990.tb08270.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Fraichard A., Chassande O., Plateroti M., Roux J. P., Trouillas J., Dehay C., Legrand C., Gauthier K., Kedinger M., Malaval L. The T3R alpha gene encoding a thyroid hormone receptor is essential for post-natal development and thyroid hormone production. EMBO J. 1997 Jul 16;16(14):4412–4420. doi: 10.1093/emboj/16.14.4412. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Koenig R. J., Lazar M. A., Hodin R. A., Brent G. A., Larsen P. R., Chin W. W., Moore D. D. Inhibition of thyroid hormone action by a non-hormone binding c-erbA protein generated by alternative mRNA splicing. Nature. 1989 Feb 16;337(6208):659–661. doi: 10.1038/337659a0. [DOI] [PubMed] [Google Scholar]
- Laudet V., Hänni C., Coll J., Catzeflis F., Stéhelin D. Evolution of the nuclear receptor gene superfamily. EMBO J. 1992 Mar;11(3):1003–1013. doi: 10.1002/j.1460-2075.1992.tb05139.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lazar M. A., Hodin R. A., Chin W. W. Human carboxyl-terminal variant of alpha-type c-erbA inhibits trans-activation by thyroid hormone receptors without binding thyroid hormone. Proc Natl Acad Sci U S A. 1989 Oct;86(20):7771–7774. doi: 10.1073/pnas.86.20.7771. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lezoualc'h F., Hassan A. H., Giraud P., Loeffler J. P., Lee S. L., Demeneix B. A. Assignment of the beta-thyroid hormone receptor to 3,5,3'-triiodothyronine-dependent inhibition of transcription from the thyrotropin-releasing hormone promoter in chick hypothalamic neurons. Mol Endocrinol. 1992 Nov;6(11):1797–1804. doi: 10.1210/mend.6.11.1480171. [DOI] [PubMed] [Google Scholar]
- Macchia E., Nakai A., Janiga A., Sakurai A., Fisfalen M. E., Gardner P., Soltani K., DeGroot L. J. Characterization of site-specific polyclonal antibodies to c-erbA peptides recognizing human thyroid hormone receptors alpha 1, alpha 2, and beta and native 3,5,3'-triiodothyronine receptor, and study of tissue distribution of the antigen. Endocrinology. 1990 Jun;126(6):3232–3239. doi: 10.1210/endo-126-6-3232. [DOI] [PubMed] [Google Scholar]
- Mangelsdorf D. J., Thummel C., Beato M., Herrlich P., Schütz G., Umesono K., Blumberg B., Kastner P., Mark M., Chambon P. The nuclear receptor superfamily: the second decade. Cell. 1995 Dec 15;83(6):835–839. doi: 10.1016/0092-8674(95)90199-x. [DOI] [PMC free article] [PubMed] [Google Scholar]
- McCabe C. J., Yarwood N. J., Gurr J. A., Gittoes N. J., Sheppard M. C., Franklyn J. A. Differential regulation of the human thyrotropin alpha-subunit promoter by thyroid hormone receptors alpha1 and beta1. Thyroid. 1998 Jul;8(7):601–608. doi: 10.1089/thy.1998.8.601. [DOI] [PubMed] [Google Scholar]
- Rousset B., Cure M., Jordan D., Kervran A., Bornet H., Mornex R. Metabolic alterations induced by chronic heat exposure in the rat: the involvement of thyroid function. Pflugers Arch. 1984 May;401(1):64–70. doi: 10.1007/BF00581534. [DOI] [PubMed] [Google Scholar]
- Sap J., Muñoz A., Damm K., Goldberg Y., Ghysdael J., Leutz A., Beug H., Vennström B. The c-erb-A protein is a high-affinity receptor for thyroid hormone. Nature. 1986 Dec 18;324(6098):635–640. doi: 10.1038/324635a0. [DOI] [PubMed] [Google Scholar]
- Selmi-Ruby S., Rousset B. Analysis of the functional state of T3 nuclear receptors expressed in thyroid cells. Mol Cell Endocrinol. 1996 May 17;119(1):95–104. doi: 10.1016/0303-7207(96)03801-4. [DOI] [PubMed] [Google Scholar]
- Strait K. A., Schwartz H. L., Perez-Castillo A., Oppenheimer J. H. Relationship of c-erbA mRNA content to tissue triiodothyronine nuclear binding capacity and function in developing and adult rats. J Biol Chem. 1990 Jun 25;265(18):10514–10521. [PubMed] [Google Scholar]
- Strait K. A., Schwartz H. L., Seybold V. S., Ling N. C., Oppenheimer J. H. Immunofluorescence localization of thyroid hormone receptor protein beta 1 and variant alpha 2 in selected tissues: cerebellar Purkinje cells as a model for beta 1 receptor-mediated developmental effects of thyroid hormone in brain. Proc Natl Acad Sci U S A. 1991 May 1;88(9):3887–3891. doi: 10.1073/pnas.88.9.3887. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Tata J. R. Gene expression during metamorphosis: an ideal model for post-embryonic development. Bioessays. 1993 Apr;15(4):239–248. doi: 10.1002/bies.950150404. [DOI] [PubMed] [Google Scholar]
- Weinberger C., Thompson C. C., Ong E. S., Lebo R., Gruol D. J., Evans R. M. The c-erb-A gene encodes a thyroid hormone receptor. Nature. 1986 Dec 18;324(6098):641–646. doi: 10.1038/324641a0. [DOI] [PubMed] [Google Scholar]
- Weiss R. E., Forrest D., Pohlenz J., Cua K., Curran T., Refetoff S. Thyrotropin regulation by thyroid hormone in thyroid hormone receptor beta-deficient mice. Endocrinology. 1997 Sep;138(9):3624–3629. doi: 10.1210/endo.138.9.5412. [DOI] [PubMed] [Google Scholar]
- Weiss R. E., Murata Y., Cua K., Hayashi Y., Seo H., Refetoff S. Thyroid hormone action on liver, heart, and energy expenditure in thyroid hormone receptor beta-deficient mice. Endocrinology. 1998 Dec;139(12):4945–4952. doi: 10.1210/endo.139.12.6412. [DOI] [PubMed] [Google Scholar]
- Wikström L., Johansson C., Saltó C., Barlow C., Campos Barros A., Baas F., Forrest D., Thorén P., Vennström B. Abnormal heart rate and body temperature in mice lacking thyroid hormone receptor alpha 1. EMBO J. 1998 Jan 15;17(2):455–461. doi: 10.1093/emboj/17.2.455. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wondisford F. E., Farr E. A., Radovick S., Steinfelder H. J., Moates J. M., McClaskey J. H., Weintraub B. D. Thyroid hormone inhibition of human thyrotropin beta-subunit gene expression is mediated by a cis-acting element located in the first exon. J Biol Chem. 1989 Sep 5;264(25):14601–14604. [PubMed] [Google Scholar]
- Wood W. M., Kao M. Y., Gordon D. F., Ridgway E. C. Thyroid hormone regulates the mouse thyrotropin beta-subunit gene promoter in transfected primary thyrotropes. J Biol Chem. 1989 Sep 5;264(25):14840–14847. [PubMed] [Google Scholar]
- Yamada M., Saga Y., Shibusawa N., Hirato J., Murakami M., Iwasaki T., Hashimoto K., Satoh T., Wakabayashi K., Taketo M. M. Tertiary hypothyroidism and hyperglycemia in mice with targeted disruption of the thyrotropin-releasing hormone gene. Proc Natl Acad Sci U S A. 1997 Sep 30;94(20):10862–10867. doi: 10.1073/pnas.94.20.10862. [DOI] [PMC free article] [PubMed] [Google Scholar]