RGD Reference Report - L-type amino acid transporter 1 expression is upregulated and associated with cellular proliferation in colorectal cancer. - Rat Genome Database

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L-type amino acid transporter 1 expression is upregulated and associated with cellular proliferation in colorectal cancer.

Authors: Hayase, Suguru  Kumamoto, Kensuke  Saito, Katsuharu  Kofunato, Yasuhide  Sato, Yu  Okayama, Hirokazu  Miyamoto, Kotaro  Ohki, Shinji  Takenoshita, Seiichi 
Citation: Hayase S, etal., Oncol Lett. 2017 Dec;14(6):7410-7416. doi: 10.3892/ol.2017.7148. Epub 2017 Oct 6.
RGD ID: 151361284
Pubmed: PMID:29344181   (View Abstract at PubMed)
PMCID: PMC5755048   (View Article at PubMed Central)
DOI: DOI:10.3892/ol.2017.7148   (Journal Full-text)

Previous studies have shown that the L-type amino acid transporter 1 (LAT1) is highly expressed in many types of cancer. Upregulated LAT1 expression is considered to be associated with cancer cell proliferation. In the present study, we investigated LAT1 expression in 210 patients with colorectal cancer (CRC) and 40 patients with colonic adenoma using an immunohistochemical method, and analyzed the associations between LAT1 expression and clinicopathological factors and prognosis. The biological significance of LAT1 was also examined under conditions with sub-normal amounts of essential amino acids using colon cancer cell lines. High expression of LAT1 was observed in 152 of 210 CRC patients (72.4%) and 12 of 40 patients with colonic adenoma (30%), and this difference in the frequency of LAT1 expression between CRC and adenoma was significant (P<0.001). High expression of LAT1 was associated with venous invasion (P=0.027). The restriction of amino acids suppressed cell proliferation in CRC cells with higher LAT1 expression, while cellular proliferation was not suppressed in the cells expressing lower levels of LAT1. Mammalian target of rapamycin (mTOR) expression was also downregulated under restricted availability of amino acids, suggesting that the restriction of amino acids induced an antitumor effect through inhibition of the LAT1/mTOR pathway. In summary, the present study demonstrated that LAT1 expression is frequently upregulated in CRC and is associated with cancer cell proliferation via the mTOR pathway.



RGD Manual Disease Annotations    Click to see Annotation Detail View

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
SLC7A5Humancolorectal cancer severityIEP  RGD 
Slc7a5Ratcolorectal cancer severityISOSLC7A5 (Homo sapiens) RGD 
Slc7a5Mousecolorectal cancer severityISOSLC7A5 (Homo sapiens) RGD 

Objects Annotated

Genes (Rattus norvegicus)
Slc7a5  (solute carrier family 7 member 5)

Genes (Mus musculus)
Slc7a5  (solute carrier family 7 (cationic amino acid transporter, y+ system), member 5)

Genes (Homo sapiens)
SLC7A5  (solute carrier family 7 member 5)


Additional Information