BMP8A sustains spermatogenesis by activating both SMAD1/5/8 and SMAD2/3 in spermatogonia
Mutation in either of the genes encoding bone morphogenetic protein (BMP) 8A or 8B (Bmp8a or Bmp8b) causes postnatal depletion of spermatogonia in mice. We found that Bmp8a, but not Bmp8b, was expressed predominantly in the neonatal mouse spermatogonia. Although most BMPs induce activation of SMADs 1, 5, and 8 (SMAD1/5/8), but not SMADs 2 and 3 (SMAD2/3), we found that BMP8A induced signaling through both sets of transcription factors. In undifferentiated mouse spermatogonia, BMP8A activated SMAD1/5/8 through receptor complexes formed by ALK3 and either ACVR2A or BMPR2 and activated SMAD2/3 through receptor complexes formed by ALK5 and ACVR2A, ACVR2B, or TGFBR2. Signaling through SMAD2/3 promoted the proliferation of germ cells, whereas that through SMAD1/5/8 directed the subsequent differentiation of spermatogonia. BMP8A promoted spermatogenesis in cultured mouse testis explants, and the resulting spermatids were functionally competent for fertilization. These results suggest that the dual role of BMP8A in promoting proliferation and differentiation of spermatogonia may be exploited clinically to treat male infertility.
Condition: Infertility, Male Interventions: Dietary Supplement: Dietary Supplement with L-carnitine (FertilHom); Dietary Supplement: Control Dietary Supplement Sponsor: NATURAmedicatrix Sàrl Not yet recruiting
CONCLUSION: Despite a more frequent presentation with advanced disease, colorectal cancer has a similar prognosis in pregnancy when compared with the general population. Diagnostic interventions and treatment should not be delayed due to the pregnancy but a balance between maternal and foetal wellbeing must always be kept in mind. PMID: 30010511 [PubMed - as supplied by publisher]
[Nairobi News] Two in every 10 couples suffer from infertility, data has shown.
CONCLUSION: Trends favoring twice daily dosing are encouraging findings and require further investigation. PMID: 29999292 [PubMed - in process]
CONCLUSION: Expression of gap junction protein correlates with quantity of oocytes retrieved and might be related to pregnancy outcome. This study suggests that lack of connexin43 expression may contribute to poor ovarian response. PMID: 29999282 [PubMed - in process]
CONCLUSION: When selecting REI fellows for interviews, fellowship directors value candidates who have trained at competitive OB/GYN residency programs, who have clinical or basic science research experience, and who have contributed to scientific literature as first author. When subsequently ranking fellowship applicants, however, the most important factors are those found in the interview process, such as identification as a "team player". PMID: 29999279 [PubMed - in process]
Uterine myomas are common benign monoclonal tumors with extremely low potential for malignancy. They are estimated to be present in up to 70% of women of reproductive age , with a higher incidence in obese women and those of African American descent, and when symptomatic, a frequent indication for gynecologic surgery. Although the presence of myomas may be associated with a plethora of symptoms including pelvic pain, abnormal uterine bleeding, infertility/subfertility, and adverse pregnancy outcomes , the vast majority of women with uterine fibroids are asymptomatic.
Abstract Background: In the current society, infertility related to age has become a social problem. The in vitro fertilization (IVF) success rate in women with poor ovarian response (POR) is very low. Dandelion extract T-1 (DE-T1) is an effective component of the extract from the leaves and stems of Taraxacum officinale, which is one of the medicines used in some patients with POR, but its molecular mechanism remains unclear. Methods: Following IVF, ovarian granulosa cells (GCs) of sixty patients were extracted and divided into normal ovarian response (NOR) and POR groups. GCs were cultured in a dose-depende...
In conclusion, we showed a high incidence of sex chromosome DSD among Egyptian DSD patients with wide karyotype/phenotype diversity. The most frequent sex chromosome DSD detected among patients of the present study was Turner syndrome and variants (52.08%; 25/48) followed by Klinefelter syndrome and variants (43.75%; 21/48). Further long term studies are necessary for accurate detection of frequencies of different types of sex chromosomal anomalies and associated phenotypes. PMID: 30007989 [PubMed - as supplied by publisher]
β-arrestins and biased signalling in gonadotropin receptors. Minerva Ginecol. 2018 Jul 10;: Authors: De Pascali F, Reiter E Abstract Gonadotropin receptors include the follicle stimulating hormone receptor (FSHR) and the luteinizing hormone/choriogonadotropin receptor (LHCGR), both belong to the G protein- coupled receptor (GPCR) superfamily and being essential to reproduction. FSHR is activated by follicle stimulating hormone (FSH) while LHCGR is activated by either luteinizing hormone (LH) or choriogonadotropin (CG). Upon ligand binding, gonadotropin receptors undergo conformational changes that...