Gemeprost

Medical termination of pregnancy, also known as medication abortion, is a safe and effective method of terminating pregnancies in the early stages. It involves using medications, such as mifepristone and prostaglandin, to induce a miscarriage. The success rates of medical abortion vary depending on factors such as gestational age and the specific medications used. For pregnancies that are 49 days or less, the success rates range from 92% to 98%. The choice between misoprostol and gemeprost, both prostaglandins, does not significantly impact the outcomes. It is important to note that various factors, including study design, definitions of success, and prior experience with medical abortion may influence success rates. Strict criteria for success and limited familiarity with the procedure may result in lower reported success rates. Medical termination of pregnancy should be carried out under the guidance and supervision of healthcare professionals. It is crucial to consult a healthcare provider to receive accurate information, personalized guidance, and appropriate support throughout the process. Each situation is unique, and decisions regarding medical termination of pregnancy should be made in collaboration with a trusted healthcare provider.

Prostaglandin E2 (PGE₂) and 16,16-dimethyl-PGE₂ (dmPGE₂) are important regulators of hematopoietic stem and progenitor cell (HSPC) fate and offer potential to enhance stem cell therapies [C. Cutler et al. Blood 122, 3074-3081(2013); W. Goessling et al. Cell Stem Cell 8, 445-458 (2011); W. Goessling et al. Cell 136, 1136-1147 (2009)]. Here, we report that PGE₂-induced changes in chromatin at enhancer regions through histone-variant H2A.Z permit acute inflammatory gene induction to promote HSPC fate. We found that dmPGE₂-inducible enhancers retain MNase-accessible, H2A.Z-variant nucleosomes permissive of CREB transcription factor (TF) binding. CREB binding to enhancer nucleosomes following dmPGE₂ stimulation is concomitant with deposition of histone acetyltransferases p300 and Tip60 on chromatin. Subsequent H2A.Z acetylation improves chromatin accessibility at stimuli-responsive enhancers. Our findings support a model where histone-variant nucleosomes retained within inducible enhancers facilitate TF binding. Histone-variant acetylation by TF-associated nucleosome remodelers creates the accessible nucleosome landscape required for immediate enhancer activation and gene induction. Our work provides a mechanism through which inflammatory mediators, such as dmPGE₂, lead to acute transcriptional changes and modify HSPC behavior to improve stem cell transplantation.