Biology:Aquaporin 3

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A representation of the 3D structure of the protein myoglobin showing turquoise α-helices.
Generic protein structure example

Aquaporin 3 is the protein product of the human AQP3 gene.[1] It is found in the basolateral cell membrane of principal collecting duct cells and provides a pathway for water to exit these cells.[2] Aquaporin 3 is also permeable to glycerol, ammonia, urea, and hydrogen peroxide. It is expressed in various tissues including the skin, respiratory tract, and kidneys as well as various types of cancers.[3] In the kidney, aquaproin 3 is unresponsive to vasopressin (a.k.a. Antidiuretic Hormone), unlike Aquaporin 2.[4] This protein is also a determinant for the GIL blood group system.[5]

Suberoylanilide hydroxamic acid (SAHA) (a HDAC inhibitor) increases expression of aquaporin-3 in normal skin cells (keratinocytes).[6]

Clinical significance

Aquaporin 3 levels are often lower in psoriasis than in healthy skin.[6]

Aquaporin 3 is expressed more in atopic eczema.[7]

Recent studies indicate that aquaporin 3 is overexpressed in many types of malignancies such as melanoma[3] and primary effusion lymphomas[8] as well as cancers of the lung, colon, stomach, esophagus, mouth, liver, and pancreatic duct.[1][8] Based on these as well as cell culture studies, it is suggested that this overexpression contributes to the growth and spread of at least some of these cancers and therefore may be a therapeutic target for the treatment of these cancers.[1][3][8]

See also

References

  1. 1.0 1.1 1.2 "Aquaporin-3 in Cancer". International Journal of Molecular Sciences 18 (10): 2106. October 2017. doi:10.3390/ijms18102106. PMID 28991174. 
  2. "Aquaporin-2 and -3: representatives of two subgroups of the aquaporin family colocalized in the kidney collecting duct". Annu. Rev. Physiol. 60: 199–220. 1998. doi:10.1146/annurev.physiol.60.1.199. PMID 9558461. 
  3. 3.0 3.1 3.2 "Emergent Nanotechnological Strategies for Systemic Chemotherapy against Melanoma". Nanomaterials 9 (10): 1455. October 2019. doi:10.3390/nano9101455. PMID 31614947. 
  4. "Aquaporins (Water Channels): Role in Vasopressin-Activated Water Transport". Proc. Soc. Exp. Biol. Med. 219 (3): 183–99. 1998. doi:10.3181/00379727-219-44332. PMID 9824541. 
  5. "AQP3 deficiency in humans and the molecular basis of a novel blood group system, GIL". J. Biol. Chem. 277 (48): 45854–9. 2002. doi:10.1074/jbc.M208999200. PMID 12239222. 
  6. 6.0 6.1 Cancer therapy shows promise for psoriasis treatment
  7. "Increased expression of aquaporin 3 in atopic eczema.". Allergy 61 (9): 1132–7. 2006. doi:10.1111/j.1398-9995.2006.01151.x. PMID 16918518. 
  8. 8.0 8.1 8.2 "Biology and management of primary effusion lymphoma". Blood 132 (18): 1879–1888. November 2018. doi:10.1182/blood-2018-03-791426. PMID 30154110. 

Further reading

External links