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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

ClC-5 Does Not Affect Megalin Expression and Function in the Thyroid.

Megalin is an endocytic receptor responsible for thyroglobulin ( Tg) transcytosis, a process that favors hormone release. Accordingly, megalin KO mice have primary hypothyroidism. In the kidney, megalin expression is reduced when the gene encoding the chloride transporter ClC-5 is mutated. We investigated whether megalin expression and function in the thyroid are affected by ClC-5 using a ClC-5 KO mouse model. By Western blotting, ClC-5 was found in thyroid tissue extracts of WT, but not of ClC-5 KO mice. In addition, ClC-5 was found to be expressed by cultured thyroid cells (FRTL-5). The thyroid size, weight, and histology were similar in ClC- 5 KO and WT mice, as were the amounts of megalin in thyroid extracts. Accordingly, serum Tg, a measure of megalin-mediated transcytosis, was similar in WT and ClC-5 KO mice, suggesting that megalin function was unaffected. Thus, unlike in megalin KO mice, in ClC-5 KO mice thyroid function was unchanged, as indicated by the normal serum FT4 and TSH. We concluded that in the thyroid, unlike in the kidney, ClC-5 does not affect megalin expression and function, suggesting that megalin is differentially regulated in these two organs.[1]


  1. ClC-5 Does Not Affect Megalin Expression and Function in the Thyroid. Maritzen, T., Lisi, S., Botta, R., Pinchera, A., Fanelli, G., Viacava, P., Marcocci, C., Marinò, M. Thyroid (2006) [Pubmed]
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