This paper is to investigate PS-ODN's (antisense-PS-ODN of hTR,sense-PS-ODN of hTR and random sequence) effects on telomerase activity and proliferation of P3 pancreatic cancer cells,and to find a novel method for gene therapy of pancreatic cancer. The results indicate that the anti-hTR complementary to the template region of hTR is sufficient to inhibit P3 cell telomerase activity and cell proliferation in vitro,and as a result, they can lead to a profound induction of programmed cell death. Telomerase represents an interesting and promising anticancer drug target and anti-telomerase technology may have potential significance in tumor therapy.
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Oral Oncol
January 2025
Department of Medical, Surgical and Health Sciences, University of Trieste, 34149 Trieste, Italy.
Head and neck squamous cell carcinomas (HNSCCs) represent a heterogeneous group of malignancies with multifactorial aetiologies. High-risk human papillomavirus (hrHPV) infections, particularly HPV16, and the dysregulation of telomerase activity, specifically through its catalytic subunit, telomerase reverse transcriptase (TERT) are among the key contributors to HNSCC development and progression. HPV promotes oncogenesis via the E6 and E7 oncoproteins, which inactivate tumour suppressors TP53 and RB1, leading to unchecked cellular proliferation.
View Article and Find Full Text PDFJ Pediatr Surg
December 2024
Department of Surgery, St. Jude Children's Research Hospital, Memphis, Tennessee, USA. Electronic address:
Background: Patients with diffuse anaplastic Wilms tumor (DAWT) experience relatively poor oncologic outcomes. Previous work has described mechanisms of telomerase upregulation in DAWT, posing a potential therapeutic target.
Methods: We assessed in vitro sensitivity to vincristine, irinotecan, and telomerase-targeting drug 6-thio-2'-deoxyguanosine (6 dG) in DAWT cell lines WiT49 and PDM115 and in spheroids derived from cell lines and four DAWT patient-derived xenografts (PDX).
Sci Adv
January 2025
Department of Biochemistry and Molecular Biology, Tulane University School of Medicine, Louisiana Cancer Research Center, 1700 Tulane Avenue, New Orleans, LA 70112, USA.
Unlike most species that use telomerase for telomere maintenance, many dipterans, including , rely on three telomere-specific retrotransposons (TRs)-, , and -to form tandem repeats at chromosome ends. Although TR transcription is crucial in their life cycle, its regulation remains poorly understood. This study identifies the Mediator complex, E2F1-Dp, and Scalloped/dTEAD as key regulators of TR transcription.
View Article and Find Full Text PDFSci Rep
December 2024
Department of Psychiatry and Behavioral Sciences and Weill Center for Neurosciences, University of California, San Francisco, CA, 94107, USA.
Telomere attrition is a hallmark of biological aging, contributing to cellular replicative senescence. However, few studies have examined the determinants of telomere attrition in vivo in humans. Mitochondrial Health Index (MHI), a composite marker integrating mitochondrial energy-transformation capacity and content, may be one important mediator of telomere attrition, as it could impact telomerase activity, a direct regulator of telomere maintenance.
View Article and Find Full Text PDFFront Endocrinol (Lausanne)
December 2024
Department of Obstetrics and Gynecology, Hefei Maternal and Child Health Hospital, Hefei, China.
Objective: Gestational diabetes mellitus (GDM) is a common complication during pregnancy and increases the risk of metabolic diseases in offspring. We hypothesize that the poor intrauterine environment in pregnant women with GDM may lead to chromosomal DNA damage and telomere damage in umbilical cord blood cells, providing evidence of an association between intrauterine programming and increased long-term metabolic disease risk in offspring.
Methods: We measured telomere length (TL), serum telomerase (TE) activity, and oxidative stress markers in umbilical cord blood mononuclear cells (CBMCs) from pregnant women with GDM (N=200) and healthy controls (Ctrls) (N=200) and analysed the associations of TL with demographic characteristics, biochemical indicators, and blood glucose levels.
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