RESUMO
Reprogramming human somatic cells into a pluripotent state, achieved through the activation of well-defined transcriptional factors known as OSKM factors, offers significant potential for regenerative medicine. While OSKM factors are a robust reprogramming method, efficiency remains a challenge, with only a fraction of cells undergoing successful reprogramming. To address this, we explored genes related to genomic integrity and cellular survival, focusing on iPSCs (A53T-PD1) that displayed enhanced colony stability. Our investigation had revealed three candidate genes CCN3, POSTN, and PTHLH that exhibited differential expression levels and potential roles in iPSC stability. Subsequent analyses identified various protein interactions for these candidate genes. POSTN, significantly upregulated in A53T-PD1 iPSC line, showed interactions with extracellular matrix components and potential involvement in Wnt signaling. CCN3, also highly upregulated, demonstrated interactions with TP53, CDKN1A, and factors related to apoptosis and proliferation. PTHLH, while upregulated, exhibited interactions with CDK2 and genes involved in cell cycle regulation. RT-qPCR validation confirmed elevated CCN3 and PTHLH expression in A53T-PD1 iPSCs, aligning with RNA-seq findings. These genes' roles in preserving pluripotency and cellular stability require further exploration. In conclusion, we identified CCN3, POSTN, and PTHLH as potential contributors to genomic integrity and pluripotency maintenance in iPSCs. Their roles in DNA repair, apoptosis evasion, and signaling pathways could offer valuable insights for enhancing reprogramming efficiency and sustaining pluripotency. Further investigations are essential to unravel the mechanisms underlying their actions.
RESUMO
The septal perforation is a challenging condition that faces the otolaryngologist. The aim of our work was to evaluate this endoscopic repair of this septal perforation using a unilateral anterior ethmoid artery flap with or without a cartilage graft. Patients and methods: The authors conducted a retrospective cohort study between June 2020 and June 2022. Our study included all adult patients with septal perforation due to trauma (operative and self-induced) lasting for more than one year. Patients underwent an endoscopic repair of a perforation and a questionnaire regarding subjective quality of life was completed at 3 months postoperatively. Results: A total of 18 patients were included in our study. The main symptoms were crusting (100%), bleeding (38.85%), whistling (16.6%), anosmia (16.6), and nasal obstruction sensation (11%). The mean perforation size was 13.6 mm, ranging between 4 mm and 28 mm. Number of years with the perforation (ranged between 2 and 16 years) with a mean of 4.876±1.645 years and a mode of 2 years. All cases were repaired using an endoscopic unilateral anterior ethmoid artery flap with or without cartilage.There were no intraoperative complications but postoperatively, these included pain, ranging between a score of 2 and 8 on the pain score chart, (the mean score was five and mode was four, appeared in six patients), which was treated with over-the-counter painkillers. In addition, there was one patient (5%) with a residual small perforation (2 mm). All patients were happy to fill out postoperative patient satisfaction questionnaires after 3 months. The mean was 21.8889 ±1.655 points and the mode, 25 points (highest possible score), appeared four times. The lowest scoring questionnaire summated to 15 points. Conclusions: The endoscopic unilateral anterior ethmoid artery nasal flap with or without cartilage graft has proven to be a reliable and a valuable graft that, with proper planning, can provide excellent results with minimal morbidity for nasal septal perforation repair.