Suppression of circulating AP001429.1 long non‑coding RNA in obese patients with breast cancer

Abstract

Long non-coding RNAs (lncRNAs), a type of cellular RNA, play a critical regulatory role in several physiological developments and pathological processes, such as tumorigenesis and tumor progression. Obesity is a risk factor for a number of serious health conditions, including breast cancer (BC). However, the underlying mechanisms behind the association between obesity and increased BC incidence and mortality remain unclear. Several studies have reported changes in lncRNA expression due to obesity and BC, independently encouraging further investigation of the relationship between the two in connection with lncRNAs. The present study was designed to first screen for the expression of 29 selected lncRNAs that showed a link to cancer or obesity in the blood of a selected cohort of 6 obese and 6 non-obese patients with BC. The expression levels of significantly expressed lncRNAs, AP001429.1, PCAT6, P5549, P19461 and P3134 , were further investigated in a larger cohort of 69 patients with BC (36 obese and 33 non-obese), using reverse transcription-quantitative polymerase chain reaction. Results showed not only that AP001429.1 remained significantly downregulated in the larger cohort (P=0.002), but also that it was associated with several clinicopathological characteristics, such as negative HER2 status, negative E-cadherin expression, negative vascular invasion, negative margin invasion and LCIS. These findings suggest that obesity may have a role in inhibiting AP001429.1 expression, which may serve as a novel potential biomarker and therapeutic target for BC.

Herpesvirus entry mediator as a potential biomarker in breast cancer compared with conventional cytotoxic T‑lymphocyte‑associated antigen 4

“…The participants were provided with information concerning the study and requested to sign a consent form. Clinicopathological data were acquired from the Department of Laboratory Medicine and Pathology, KAUH ( 23 ).…”

Epigenetic modifications in obesity‐associated diseases

“…Recent study has indicated that obesity can reduce the expression of lncRNA AP001429.1 in patients with BC, thus promoting cancer progression. 123 Downregulation of lncRNA five prime to Xist (FTX) and overexpression of lncRNA small nucleolar RNA host gene 20 (SNHG20) promoted the development of nonalcoholic fatty liver disease (NAFLD) into HCC by modulating the polarization of Kupffer cells. 124,125 The leptin and estradiol levels in postmenopausal obese women are high, and the two hormones contribute to angiogenesis, survival, cell proliferation, and migration.…”

“…In the context of BC, lncRNA AP001429.1 can target multiple miRNAs, potentially exerting anticancer effects. Recent study has indicated that obesity can reduce the expression of lncRNA AP001429.1 in patients with BC, thus promoting cancer progression 123 . Downregulation of lncRNA five prime to Xist (FTX) and overexpression of lncRNA small nucleolar RNA host gene 20 (SNHG20) promoted the development of nonalcoholic fatty liver disease (NAFLD) into HCC by modulating the polarization of Kupffer cells 124,125 .…”

Role of long non-coding RNAs in adipose tissue metabolism and associated pathologies

“…AP001429.1 882 is a lncRNA that may have a protective role against breast cancer. Its expression was measured in obese 883 and non-obese individuals with breast cancer and it was found that AP001429.1 is downregulated in 884 obese patients with breast cancer compared with non-obese individuals with breast cancer [255]. 885 lncRNA-small nucleolar RNA host gene 9 (LncRNA-SNHG9) 886…”