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Expression of the Abca-subfamily of genes in Abcc6-/- mice--upregulation of Abca4.

ABSTRACT: Pseudoxanthoma elasticum (PXE), a heritable multi-system disorder, is caused by mutations in the ABCC6 gene primarily expressed in the liver. Recent analysis of cultured fibroblasts from patients with PXE has suggested compensatory alterations in the expression of the ABCA-subfamily of genes. We have now determined by quantitative RT-PCR the level of expression of Abca-family of genes in a mouse model of PXE developed by targeted ablation of Abcc6. The results indicated variable levels of mRNA for different Abca genes in the liver; however, only one of them, Abca4, was significantly, ?6.5-fold, upregulated in the Abcc6(-/-) mice in comparison with wild-type mice. In the same mice, Abca4 was not upregulated in the eyes or the kidney, suggesting that the upregulation of Abca4 in the liver is a tissue-specific compensatory consequence of the 'knock-out' of Abcc6.

SUBMITTER: Li Q

PROVIDER: S-EPMC3079327 | biostudies-literature | 2011 May

REPOSITORIES: biostudies-literature

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Expression of the Abca-subfamily of genes in Abcc6-/- mice--upregulation of Abca4.

Li Qiaoli Q Uitto Jouni J

Experimental dermatology 20110322 5

Pseudoxanthoma elasticum (PXE), a heritable multi-system disorder, is caused by mutations in the ABCC6 gene primarily expressed in the liver. Recent analysis of cultured fibroblasts from patients with PXE has suggested compensatory alterations in the expression of the ABCA-subfamily of genes. We have now determined by quantitative RT-PCR the level of expression of Abca-family of genes in a mouse model of PXE developed by targeted ablation of Abcc6. The results indicated variable levels of mRNA f ...[more]

PMID: 21435020

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Project description:BACKGROUND:ATP-binding cassette (ABC) transporters play various roles in cancer biology and drug resistance, but their association with outcomes in serous epithelial ovarian cancer (EOC) is unknown. METHODS:The relationship between clinical outcomes and ABC transporter gene expression in two independent cohorts of high-grade serous EOC tumors was assessed with real-time quantitative polymerase chain reaction, analysis of expression microarray data, and immunohistochemistry. Associations between clinical outcomes and ABCA transporter gene single nucleotide polymorphisms were tested in a genome-wide association study. Impact of short interfering RNA-mediated gene suppression was determined by colony forming and migration assays. Association with survival was assessed with Kaplan-Meier analysis and log-rank tests. All statistical tests were two-sided. RESULTS:Associations with outcome were observed with ABC transporters of the "A" subfamily, but not with multidrug transporters. High-level expression of ABCA1, ABCA6, ABCA8, and ABCA9 in primary tumors was statistically significantly associated with reduced survival in serous ovarian cancer patients. Low levels of ABCA5 and the C-allele of rs536009 were associated with shorter overall survival (hazard ratio for death = 1.50; 95% confidence interval [CI] =1.26 to 1.79; P = 6.5e-6). The combined expression pattern of ABCA1, ABCA5, and either ABCA8 or ABCA9 was associated with particularly poor outcome (mean overall survival in group with adverse ABCA1, ABCA5 and ABCA9 gene expression = 33.2 months, 95% CI = 26.4 to 40.1; vs 55.3 months in the group with favorable ABCA gene expression, 95% CI = 49.8 to 60.8; P = .001), independently of tumor stage or surgical debulking status. Suppression of cholesterol transporter ABCA1 inhibited ovarian cancer cell growth and migration in vitro, and statin treatment reduced ovarian cancer cell migration. CONCLUSIONS:Expression of ABCA transporters was associated with poor outcome in serous ovarian cancer, implicating lipid trafficking as a potentially important process in EOC.

Dataset Information

Expression of the Abca-subfamily of genes in Abcc6-/- mice--upregulation of Abca4.

Publications

Expression of the Abca-subfamily of genes in Abcc6-/- mice--upregulation of Abca4.

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