Biology:Sodium-iodide symporter

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Generic protein structure example

A sodium/iodide symporter (NIS), also known as a sodium/iodide cotransporter[1] or solute carrier family 5, member 5 (SLC5A5) is a protein that in humans is encoded by the SLC5A5 gene.[2][3][4] It is a transmembrane glycoprotein with a molecular weight of 87 kDa and 13 transmembrane domains, which transports two sodium cations (Na+) for each iodide anion (I−) into the cell.[5] NIS mediated uptake of iodide into follicular cells of the thyroid gland is the first step in the synthesis of thyroid hormone.[5]

Iodine uptake

Iodine uptake mediated by thyroid follicular cells from the blood plasma is the first step for the synthesis of thyroid hormones. This ingested iodine is bound to serum proteins, especially to albumins.[citation needed] The rest of the iodine which remains unlinked and free in bloodstream, is removed from the body through urine (the kidney is essential in the removal of iodine from extracellular space).

Iodine uptake is a result of an active transport mechanism mediated by the NIS protein, which is found in the basolateral membrane of thyroid follicular cells. As a result of this active transport, iodide concentration inside follicular cells of thyroid tissue is 20 to 50 times higher than in the plasma. The transport of iodide across the cell membrane is driven by the electrochemical gradient of sodium (the intracellular concentration of sodium is approximately 12 mM and extracellular concentration 140 mM). Once inside the follicular cells, the iodide diffuses to the apical membrane, where it is metabolically oxidized through the action of thyroid peroxidase to iodinium (I+) which in turn iodinates tyrosine residues of the thyroglobulin proteins in the follicle colloid. Thus, NIS is essential for the synthesis of thyroid hormones (T3 and T4).

Thyroid hormone synthesis, with the Na/I symporter seen at right.

Apart from thyroid cells NIS can also be found, although less expressed, in other tissues such as the salivary glands, the gastric mucosa, the kidney, the placenta, the ovaries and the mammary glands during pregnancy and lactation. NIS expression in the mammary glands is quite a relevant fact since the regulation of iodide absorption and its presence in the breast milk is the main source of iodine for a newborn. Note that the regulation of NIS expression in thyroid is done by the thyroid-stimulating hormone (TSH), whereas in breast is done by a combination of three molecules: prolactin, oxytocin and β-estradiol.

Inhibition by Environmental Chemicals

Some anions like perchlorate, pertechnetate and thiocyanate, can affect iodide capture by competitive inhibition because they can use the symporter when their concentration in plasma is high, even though they have less affinity for NIS than iodide has. Many plant cyanogenic glycosides, which are important pesticides, also act via inhibition of NIS in a large part of animal cells of herbivores and parasites and not in plant cells.

Using a validated in vitro radioactive iodide uptake (RAIU) assay,[6] the Besides the traditionally known anions such as perchlorate, organic chemicals may also pose inhibition of iodide uptake via NIS.[7]

Regulation in iodine uptake

The iodine transport mechanisms are closely submitted to the regulation of NIS expression. There are two kinds of regulation on NIS expression: positive and negative regulation. Positive regulation depends on TSH, which acts by transcriptional and posttranslational mechanisms. On the other hand, negative regulation depends on the plasmatic concentrations of iodide.

Transcriptional regulation

At a transcriptional level, TSH regulates the thyroid's function through cAMP. TSH first binds to its receptors which are joined to G proteins, and then induces the activation of the enzyme adenylate cyclase, which will raise the intracellular levels of cAMP. This can activate the CREB transcription factor (cAMP Response Element-Binding) that will bind to the CRE (cAMP Responsive Element). However, this might not occur and, instead, the increase in cAMP can be followed by PKA (Protein kinase A) activation and, as a result, the activation of the transcription factor Pax8 after phosphorylation.

These two transcription factors influence the activity of NUE (NIS Upstream Enhancer), which is essential for initiating transcription of NIS. NUE’s activity depends on 4 relevant sites which have been identified by mutational analysis. The transcriptional factor Pax8 binds in two of these sites. Pax8 mutations lead to a decrease in the transcriptional activity of NUE.[8] Another binding-site is the CRE, where the CREB binds, taking part in NIS transcription.

In contrast, growth factors such as IGF-1 and TGF-β (which is induced by the BRAF-V600E oncogene)[9] suppress NIS gene expression, not letting NIS localize in the membrane.

Posttranslational regulation

The TSH can also regulate the iodide uptake at a posttranslational level, since, if it’s absent, the NIS can be resorted from the basolateral membrane of the cell in to the cytoplasm where it is no longer functional. Therefore, the iodide uptake is reduced.

Thyroid diseases

The lack of iodide transport inside follicular cells tends to cause goitres. There are some mutations in the NIS DNA that cause hypothyroidism and thyroid dyshormonogenesis.

Moreover, antibodies anti-NIS have been found in thyroid autoimmune diseases. Using RT-PCR tests, it has been proved that there is no expression of NIS in cancer cells (which forms a thyroid carcinoma). Nevertheless, thanks to immunohistochemical techniques it is known that NIS is not functional in these cells, since it is mainly localized in the cytosol, and not in the basolateral membrane.

There is also a connection between the V600E mutation of the BRAF oncogene and papillary thyroid cancer that cannot concentrate iodine into its follicular cells.

Use with radioiodine (131I)

The main goal for the treatment of non-thyroid carcinoma is the research of less aggressive procedures that could also provide less toxicity. One of these therapies is based on transferring NIS in cancer cells of different origin (breast, colon, prostate…) using adenoviruses or retroviruses (viral vectors). This genetic technique is called gene targeting. Once NIS is transferred in these cells, the patient is treated with radioiodine (131I), being the result a low cancer cell survival rate. Therefore, a lot is expected from these therapies.

See also

References

  1. ↑ Glossary, UniProt Consortium
  2. ↑ "Entrez Gene: SLC5A5 solute carrier family 5 (sodium iodide symporter), member 5". https://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=6528. 
  3. ↑ "Cloning and characterization of the thyroid iodide transporter". Nature 379 (6564): 458–60. February 1996. doi:10.1038/379458a0. PMID 8559252. 
  4. ↑ "Expression, exon-intron organization, and chromosome mapping of the human sodium iodide symporter". Endocrinology 138 (8): 3555–8. August 1997. doi:10.1210/en.138.8.3555. PMID 9231811. 
  5. ↑ 5.0 5.1 "The sodium/iodide Symporter (NIS): characterization, regulation, and medical significance". Endocr. Rev. 24 (1): 48–77. February 2003. doi:10.1210/er.2001-0029. PMID 12588808. 
  6. ↑ "Development of a screening approach to detect thyroid disrupting chemicals that inhibit the human sodium iodide symporter (NIS)". Toxicology in Vitro 40: 66–78. April 2017. doi:10.1016/j.tiv.2016.12.006. PMID 27979590. https://doi.org/10.1016/j.tiv.2016.12.006. 
  7. ↑ "High-Throughput Screening and Quantitative Chemical Ranking for Sodium-Iodide Symporter Inhibitors in ToxCast Phase I Chemical Library". Environmental Science & Technology. April 2018. doi:10.1021/acs.est.7b06145. PMID 29611697. 
  8. ↑ "The paired-domain transcription factor Pax8 binds to the upstream enhancer of the rat sodium/iodide symporter gene and participates in both thyroid-specific and cyclic-AMP-dependent transcription". Mol. Cell. Biol. 19 (3): 2051–60. March 1999. PMID 10022892. 
  9. ↑ "The BRAFV600E oncogene induces transforming growth factor beta secretion leading to sodium iodide symporter repression and increased malignancy in thyroid cancer". Cancer Res. 69 (21): 8317–25. November 2009. doi:10.1158/0008-5472.CAN-09-1248. PMID 19861538. 

Further reading

External links




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