TMPRSS4 Overexpression Lysate

HEK293T cells in 10-cm dishes were transiently transfected with a non-lipid polymer transfection reagent specially designed and manufactured for large volume DNA transfection. Transfected cells were cultured for 48hrs before collection. The cells were lysed in modified RIPA buffer (25mM Tris-HCl pH7.6, 150mM NaCl, 1% NP-40, 1mM EDTA, 1xProteinase inhibitor cocktail mix, 1mM PMSF and 1mM Na3VO4, and then centrifuged to clarify the lysate. Protein concentration was measured by BCA protein assay kit.

TMPRSS4, previously known as TMPRSS3, is a 437 amino acid type II transmembrane serine protease located on human chromosome 11q23.3 that encodes 5 isoforms containing a complete coding sequence. This serine protease has a predicted molecular weight of 48 kDa with 2 glycosylation sites and the cleaved soluble protease domain has been detected in cell culture media. Functions of TMPRSS4 include embryo development, viral infection, and cancer. TMPRSS4 plays a role in the epithelial-mesenchymal transition (EMT) process and mediates cell invasion, migration, proliferation and metastasis. Overexpression of TMPRSS4 has been reported for multiple solid tumors including pancreatic, ovarian, thyroid, colorectal, lung, breast, cervical, gallbladder, gastric, and liver cancer, and has been associated with poor overall survival and reduced time to tumor progression (1,2).
TMPRSS4 has also been shown to play a role in the process of viral entry for coronaviruses and influenza viruses thru proteolytic activation of key viral glycoproteins. One pathway for SARS-CoV-2 infection, which causes the COVID-19 disease, involves binding of the SARS-CoV-2 Spike 'S' glycoprotein to the human ACE2 receptor and cleavage of S by TMPRSS2 or potentially by TMPRSS4 at the cell surface to facilitate viral entry (3).
References

1. L de Aberasturi A, Calvo A. (2015) TMPRSS4: An Emerging Potential Therapeutic Target in Cancer. Br J Cancer. 112(1):4-8. PMID: 25203520

2. Zeng P., Zhang P., Zhou L., Tang M., Shen Y., Jin J., Zhu Y., Chen M. (2016) TMPRSS4 as an emerging potential poor prognostic factor for solid tumors: A systematic review and meta-analysis. Oncotarget. 7:76327-76336. PMID: 27344186

3. Zang F, Castro MFG, McCune BT, Zeng Q, Rothlauf PW, Sonnek NM, Liu Z, Brulois KF, Wang X, Greenberg HB, Diamond MS, Ciorba MA, Whelan SPJ, and Ding S. (2020) TMPRSS2 and TMPRSS4 promote SARS-CoV-2 infection of human small intestinal enterocytes. Sci Immunol. 5(47): eabc3582. PMID: 32404436

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Lysates are guaranteed for 6 months from date of receipt.

Images	Ratings	Applications	Species	Date	Details
Enlarge	5 reviewed by: Ming Lu	WB	Human	08/15/2014	View Summary Application Western Blot Sample Tested lysates from Novusbio Cat# NBP2-04784 Species Human Lot 2EE45A

Array NBP2-04784

• TMPRSS4 Antibodies
• TMPRSS4 ELISA Kits
• TMPRSS4 Lysates