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Query: UMLS:C0277787 (stigma)
 13,352 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Reports of Dalkon Shield-related pelvic inflammatory disease during the 1970s severely damaged public acceptance of all IUDs. This stigma persists, despite the proven safety and efficacy of newer IUDs, especially the ParaGard T 380A and the Progestasert--the only two IUDs approved for use in the US. The ParaGard may be advantageous for older women in whom hormonal contraception is contraindicated, while the Progestasert is a good choice for women who experienced heavy bleeding with copper IUDs. This article was prepared to improve the understanding of nurse practitioners in the US of the mechanism of action of the IUD and to correct misinformation about its side effects. A special section outlines insertion techniques for the ParaGard T 380A. Given rigid patient selection guidelines and strict aseptic insertion techniques, the IUD represents a safe, long-term, cost-effective, and highly efficacious contraceptive method for monogamous women. Current theory holds that the IUD can be inserted at any time during the menstrual cycle, as long as pregnancy can be reliably excluded.
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PMID:The intrauterine device: dispelling the myths. 983 5

Infertility is of particular concern in Africa because of the extent of the problem and the social stigma attached to it. The highest prevalence of infertility in Africa occurs south of the Sahara, but 5-8% of couples are estimated to experience infertility at some point in their reproductive lives (50-80 million people worldwide). The average infertility in Africa is 10.1% of couples, with a high of 32% in some countries, and certain tribes have high infertility rates. While primary infertility is higher in other regions of the world, secondary infertility is more common in Africa, and secondary infertility rates are very complicated to determine. The World Health Organization Task Force on the Diagnosis and Treatment of Infertility instituted a standardized approach to studies of infertility which was adopted in 33 countries. Between 1978 and 1982, a pilot study of this approach examined 8504 couples and found that less than 50% of male and female infertile partners were primarily infertile, and 66% did achieve a pregnancy within the union. The cause of infertility was not determined for 35% of the women and 50% of the infertile men in the sample. Infertility was accounted for by endocrine factors (usually menstrual or ovulatory disturbances) in 35% of infertile cases and tubal factors (such as unilateral or bilateral tubal occlusion, pelvic adhesion, and other abnormalities) in 32%. About 66% of African women experienced tubal factors compared to about 33% worldwide. About 9% of women reported a history of sexually transmitted disease (STD), and 8% reported abortion complications. 46% of men in sub-Saharan Africa reported a history of STDs. About 24% of women with primary infertility and 40% of women with secondary infertility had no previous history of pelvic inflammatory disease or STDs and had tubal disease. African infections are common due to inadequate health services, improper use of antibiotics, and penicillin-resistant strains of gonorrhea. Public health programs should be implemented to prevent infection-related infertility.
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PMID:Infertility in Africa. 1231 40

We investigated the biological roles of the Arabidopsis (Arabidopsis thaliana) GROWTH-REGULATING FACTOR (GRF) and GRF-INTERACTING FACTOR (GIF) transcriptional complex in the development of gynoecia and anthers. There are nine GRFs and three GIFs in Arabidopsis, and seven GRFs are posttranscriptionally silenced by microRNA396 (miR396). We found that overexpression of MIR396 in the gif1 gif2 double mutant background (gif1 gif2 35S:MIR396) resulted in neither ovary nor pollen. Histological and molecular marker-based analyses revealed that the mutant gynoecial primordia failed to develop carpel margin meristems and mature flowers lacked the ovary, consisting only of the stigma, style, and replum-like tissues. The mutant anther primordia were not able to form the pluripotent archesporial cells that produce pollen mother cells and microsporangia. Multiple combinations of GRF mutations also displayed the same phenotypes, indicating that the GRF-GIF duo is required for the formation of those meristematic and pluripotent cells. Most GRF proteins are localized and abundant in those cells. We also found that the weak gynoecial defects of pinoid-3 (pid-3) mutants were remarkably exacerbated by gif1 gif2 double mutations and 35S:MIR396, so that none of the gynoecia produced by gif1 gif2 pid-3 and 35S:MIR396 pid-3 developed ovaries at all. Moreover, gif1 gif2 double mutations and 35S:MIR396 also acted synergistically with 1-N-naphthylphthalamic acid in forming aberrant gynoecia. The results altogether suggest that the GRF-GIF duo regulates the meristematic and pluripotent competence of carpel margin meristems and the archesporial cell lineage and that this regulation is implemented in association with auxin action, ultimately conferring reproductive competence on Arabidopsis.
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PMID:GROWTH-REGULATING FACTOR and GRF-INTERACTING FACTOR Specify Meristematic Cells of Gynoecia and Anthers. 2911 79

The stigma is the entry point for sexual reproduction in plants, but the mechanisms underlying stigma development are largely unknown. Here, we disrupted putative auxin biosynthetic and signaling genes to evaluate their roles in rice (Oryza sativa) development. Disruption of the rice PINOID (OsPID) gene completely eliminated the development of stigmas, and overexpression of OsPID led to overproliferation of stigmas, suggesting that OsPID is a key determinant for stigma development. Interestingly, ospid mutants did not display defects in flower initiation, nor did they develop any pin-like inflorescences, a characteristic phenotype observed in pid mutants in Arabidopsis (Arabidopsis thaliana) and maize (Zea mays). We constructed double mutants of OsPID and its closest homolog, OsPIDb, yet the double mutants still did not develop any pin-like inflorescences, indicating that either ospid is compensated by additional homologous genes or OsPID has different functions in rice compared with PID in other organisms. We then knocked out one of the NAKED PINS IN YUC MUTANTS (NPY) genes, which cause the formation of pin-like inflorescences in Arabidopsis when compromised, in the ospid background. The ospid osnpy2 double mutants developed pin-like inflorescences, which were phenotypically similar to pid mutants in Arabidopsis and maize, demonstrating that the roles of OsPID in inflorescence development are likely masked by redundant partners. This work identified a key determinant for stigma development in rice and revealed a complex picture of the PID gene in rice development. Furthermore, the stigma-less ospid mutants are potentially useful in producing hybrid rice.
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PMID:PINOID Is Required for Formation of the Stigma and Style in Rice. 3091 83

Stigma and ovule initiation is essential for sexual reproduction in flowering plants. However, the mechanism underlying the initiation of stigma and ovule primordia remains elusive. We identified a stigma-less mutant of rice (Oryza sativa) and revealed that it was caused by the mutation in the PINOID (OsPID) gene. Unlike the pid mutant that shows typical pin-like inflorescences in maize (Zea mays) and Arabidopsis (Arabidopsis thaliana), the ospid mutant does not display any defects in inflorescence development and flower initiation, and fails to develop normal ovules in most spikelets. The auxin activity in the young pistil of ospid was lower than that in the wild-type pistil. Furthermore, the expression of most auxin response factor genes was down-regulated, and OsETTIN1, OsETTIN2, and OsMONOPTEROS lost their rearrangements of expression patterns during pistil and stamen primordia development in ospid Moreover, the transcription of the floral meristem marker gene, OSH1, was down-regulated and FLORAL ORGAN NUMBER4, the putative ortholog of Arabidopsis CLAVATA3, was up-regulated in the pistil primordium of ospid These results suggested that the meristem proliferation in the pistil primordium might be arrested prematurely in ospid Based on these results, we propose that the OsPID-mediated auxin signaling pathway plays a crucial role in the regulation of rice stigma and ovule initiation by maintaining the floral meristem.
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PMID:OsPINOID Regulates Stigma and Ovule Initiation through Maintenance of the Floral Meristem by Auxin Signaling. 3092 55