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Am J Physiol Endocrinol Metab 285: E1223-E1229, 2003; doi:10.1152/ajpendo.00172.2003
0193-1849/03 $5.00
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MCT1 and its accessory protein CD147 are differentially regulated by TSH in rat thyroid cells

Albertina Fanelli,1 Evelyn F. Grollman,1 Dian Wang,2 and Nancy J. Philp2

1Laboratory of Biochemical Pharmacology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892; and 2Department of Pathology, Anatomy, and Cell Biology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania 19107

Submitted 16 April 2003 ; accepted in final form 18 August 2003

In thyroid cells, basal and TSH-stimulated glycolysis is associated with lactic acid efflux. In this report, we address whether monocarboxylate transporters (MCTs) are present in thyroid tissue for exporting excess lactic acid generated by aerobic glycolysis. Using immunostaining techniques, we show that MCT4 localizes with its accessory protein CD147 in the basolateral membrane of rat thyroid follicular cells. In cultured rat thyroid (FRTL-5) cells, MCT1 rather than MCT4 is expressed. CD147 colocalizes and coimmunoprecipitates with MCT1. TSH upregulates MCT1/CD147 expression as a function of time through a cAMP-dependent mechanism as forskolin reproduces the effect of TSH. TSH enhances protein expression of both MCT1 and CD147 in FRTL-5 cells. Whereas MCT1 protein expression is controlled at the level of transcription, CD147 protein expression is regulated by a posttranscriptional mechanism. Results of these studies suggest that hormone stimulation of lactate transport is mediated by regulating MCT1 transcription.

monocarboxylate transporter 1; monocarboxylate transporter 4; thyroid gland; thyroid-stimulating hormone; FRTL-5 cells; glycolysis; lactate


Address for reprint requests and other correspondence: N. J. Philp, Dept. of Pathology, Anatomy, and Cell Biology, Jefferson Medical College Thomas Jefferson University, 1021 Locust St., Rm. 534, Philadelphia, PA 19107–6799 (E-mail: Nancy.Philp{at}jefferson.edu).




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