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1.
Taiwan J Obstet Gynecol ; 61(2): 317-322, 2022 Mar.
Article in English | MEDLINE | ID: mdl-35361394

ABSTRACT

OBJECTIVE: Cesarean deliveries must be optimally timed to minimize their effects on mothers and neonates. This study aimed to determine the optimal timing of elective repeat cesarean deliveries to reduce the incidence of neonatal respiratory disorders and of emergent cesarean deliveries. MATERIALS AND METHODS: This multi-center, cross-sectional, retrospective analysis evaluated data on the maternal and neonatal outcomes of 856 singleton pregnancies scheduled for elective repeat cesarean deliveries at 37-39 weeks' gestation. The emergent cesarean delivery and neonatal respiratory disorder risks were analyzed according to the scheduled cesarean delivery times. RESULTS: The elective cesarean delivery rates were 91.0% during the first and 92.6% during the second half of the 37th week of gestation, 88.7% during the first and 82.9% during the second half of the 38th week of gestation, and 62.5% during the first and 33.3% during the second half of the 39th week of gestation. The neonatal respiratory disorder rates were 21.8% for elective cesarean deliveries during the first half of the 37th week of gestation and approximately 8% for elective cesarean deliveries during the second half of the 37th week until the first half of the 38th week of gestation. No neonatal respiratory disorders occurred among the babies delivered by elective cesarean deliveries during the 39th week of gestation. CONCLUSION: For improved maternal and neonatal outcomes in the Asian population, it may be better to perform scheduled elective repeat cesarean deliveries from the second half of the 37th week of gestation until the 38th week of gestation following confirmation of gestational age by early first trimester ultrasonography.


Subject(s)
Elective Surgical Procedures , Cross-Sectional Studies , Female , Gestational Age , Humans , Infant, Newborn , Pregnancy , Pregnancy Trimester, Third , Retrospective Studies
2.
J Epidemiol ; 32(3): 117-124, 2022 03 05.
Article in English | MEDLINE | ID: mdl-33132283

ABSTRACT

BACKGROUND: There have been few community-based epidemiological studies in which the prevalence of exogenous hormone use, including the use of oral contraceptives (OCs) and hormone replacement therapy (HRT), has been accurately assessed in Japan. METHODS: We have been conducting repeated surveys of participants in the Japan Nurses' Health Study (JNHS), as a nationwide prospective cohort study, since 2001. We determined the prevalence of exogenous hormone use at baseline and during a 10-year follow-up period. A total of 15,019 female nurses participated in the JNHS follow-up cohort. We determined the prevalence of OC use in 14,839 women <60 years of age at baseline and the prevalence of HRT use in 7,915 women, excluding premenopausal women, at the last time they answered a questionnaire. The duration of HRT use was estimated using the Kaplan-Meier method. RESULTS: Six percent of the participants used OCs. The proportion of HRT users who stopped HRT before the baseline survey, the proportion of women using HRT during the follow-up period, and the proportion of all of the participants who had used HRT were 3.2%, 10.6%, and 13.8%, respectively. The median duration of HRT use was 2 years. CONCLUSIONS: The lifetime prevalences of exogenous hormone use during this prospective study conducted in Japanese nurses were 6.0% for OCs and 13.8% for HRT. The information obtained in this study will be useful for clarification of the association between exogenous estrogen exposure and estrogen-related diseases as future research.


Subject(s)
Contraceptives, Oral , Nurses , Estrogen Replacement Therapy/adverse effects , Female , Hormone Replacement Therapy , Humans , Japan/epidemiology , Prevalence , Prospective Studies
3.
J Community Health ; 46(3): 603-608, 2021 06.
Article in English | MEDLINE | ID: mdl-32914314

ABSTRACT

This study clarifies the prevalence of rear seat belt use among university students and explores the factors that influence seat belt use on general roads and expressways. Questionnaires were distributed to 1,091 students who attended health education lectures: 893 students (81.9%) agreed to participate and met the criteria; among them, 660 (73.9%) provided complete responses. While one-third (33.0%) of rear seat passengers "always" used seat belts on general traffic roads, three-fourths (73.2%) "always" used them on expressways. Multivariate analysis revealed that being male and the perception of obligation and recognition of the benefits of rear seat belt use were associated with use on general roads, whereas the possession of a driver's license and recognition of benefits were associated with use on expressways. Finally, we suggest that educational programs on seat belt use be developed and delivered to general road and expressway users to promote seat belt use.


Subject(s)
Seat Belts , Universities , Accidents, Traffic , Humans , Japan , Male , Students , Surveys and Questionnaires
4.
J Med Invest ; 66(3.4): 297-302, 2019.
Article in English | MEDLINE | ID: mdl-31656293

ABSTRACT

The change in follicle-stimulating hormone (FSH) during the menopausal transition and associations of FSH with various diseases have been assessed by using blood samples. We examined cross-sectionally the variation of FSH levels, associations of estrone and estradiol with FSH, and associations of BMI with these hormones by using urinary samples from peri- and postmenopausal women in Japan. Of 4472 participants in the Urinary Isoflavone Concentration Survey of the Japan Nurses' Health Study, we analyzed urinary levels of estrone, estradiol and FSH in 547 women aged from 45 to 54 years. Urinary FSH levels varied widely in postmenopausal women and the pattern of change in urinary FSH levels seems to be similar to that in blood FSH levels in previous studies. There were no significant differences in age, body mass index (BMI), estradiol, estrone and estradiol/estrone ratio among three groups according to the tertile of FSH. In postmenopausal women, there were significant associations of BMI with levels of estrone and estradiol, but there was no significant association of BMI with FSH. Studies using urinary samples will allow us to establish a study project as a large-scale population-based study to determine associations between FSH and various diseases after menopause. J. Med. Invest. 66 : 297-302, August, 2019.


Subject(s)
Follicle Stimulating Hormone/urine , Menopause/urine , Body Mass Index , Cross-Sectional Studies , Estradiol/urine , Estrone/urine , Female , Humans , Middle Aged , Nurses
5.
J Interprof Care ; 33(4): 356-360, 2019.
Article in English | MEDLINE | ID: mdl-31431108

ABSTRACT

Lao People's Democratic Republic (Lao PDR) with a population of 6.8 million is a low middle-income country in Southeast Asia. Despite economic development, Lao PDR is still characterized by a weak health system. The Ministry of Health has launched health reforms to provide better health services and University of Health Sciences (UHS) plays an essential role in Human Resources for Health (HRH) reform. Especially, the importance of its role in training health professionals from entry-level to continuing education has been increased. In 2016, the UHS embedded an Interprofessional Education (IPE) concept into a pre-qualifying course, in collaboration with the World Health Organization and the Gunma University Centre for Research and Training on IPE. As a pilot study, some students from faculties of Medicine, Pharmacy, Dentistry, Nursing, and Medical Technology participated in a community-based IPE program. Results suggested that students participating in the IPE program showed more positive attitudes toward collaborative practice than students who did not participate in the IPE program. Based on the results, the UHS is planning to develop an IPE program for health workers. In this article, we describe the strategic international collaboration and discuss the keys to successful IPE planning and implementation in line with HRH reform.


Subject(s)
Clinical Competence/standards , Health Occupations/education , Health Personnel/education , Interprofessional Relations , Curriculum , Developing Countries , Humans , Laos , Pilot Projects , Program Development , Students, Health Occupations/statistics & numerical data , Universities/organization & administration
6.
J Interprof Care ; 33(6): 689-696, 2019.
Article in English | MEDLINE | ID: mdl-31020873

ABSTRACT

Communication underpinning well-functioning teamwork is a key mechanism for patient safety. Undergraduate interprofessional education (IPE) provides students with a basic understanding of the psychological factors contributing to teamwork. To develop IPE fostering a collaborative mindset for patient safety, attitudinal changes of students for patient safety were evaluated. Changes in the scores of the modified attitudes toward health care teams scale (ATHCTS) and the modified teamwork attitudes questionnaire (T-TAQ) of students pre- and post-IPE program were evaluated in the 2017 academic year. One hundred and fifty-one students (n=151) of five health professions (medicine, nursing, laboratory science, physiotherapy and occupational therapy) and 125 students of a possible 167 completed the survey before and after the IPE program, respectively. In the modified ATHCTS, 11 out of 14 items showed a significant change. The "quality of care delivery" and "patient-centered care" subscales showed significant increases in the regression factor score. In contrast, only 7 out of 30 items showed a significant increase in the modified T-TAQ. Four out of five categories, however, showed a significant increase, although the factor structure did not correspond to the T-TAQ category structure. The IPE program may have significant capacity to cultivate competencies to collaborate for patient safety. However, development of IPE may require preceding subjects providing concrete knowledge for patient safety, especially for communication and leadership.


Subject(s)
Health Occupations/education , Interprofessional Relations , Patient Safety , Students, Health Occupations/psychology , Cooperative Behavior , Cross-Sectional Studies , Curriculum , Female , Humans , Japan , Male , Patient Care Team , Surveys and Questionnaires , Young Adult
7.
Maturitas ; 121: 41-47, 2019 Mar.
Article in English | MEDLINE | ID: mdl-30704564

ABSTRACT

Results of studies on the associations of soy food intake with urinary estrogen levels in premenopausal women and in postmenopausal women have been inconsistent. We examined the associations of urinary isoflavone levels as well as soy food intake with estrone (E1) and estradiol (E2) in pre- and postmenopausal women. In addition, we compared the levels of isoflavones, E1 and E2 across current hormone users such as those receiving hormone replacement therapy and those using oral contraceptives and non-users among both pre- and postmenopausal women. Urinary levels of isoflavones, E1 and E2 in 498 women (36 hormone users and 462 non-users) were analyzed. Premenopausal women with a higher frequency of soy food intake had higher urinary isoflavone levels, but there were no significant associations between E1 and E2 levels and urinary isoflavone levels. Levels of E1 and E2 in hormone users were significantly lower than those in hormone non-users among premenopausal women, but levels of E1 and E2 in hormone users were significantly higher than those in hormone non-users among postmenopausal women. Postmenopausal women with a higher frequency of soy food intake had higher urinary isoflavone levels, and postmenopausal women with high urinary isoflavone levels had significantly higher E1 and E2 levels. In conclusion, the associations of urinary isoflavone levels with urinary estrogen levels differed with menopausal status. Urinary levels of E1 and E2 were high in postmenopausal women with high urinary isoflavone levels but not in premenopausal women with high urinary isoflavone levels.


Subject(s)
Contraceptives, Oral/therapeutic use , Estrogens/urine , Hormone Replacement Therapy , Isoflavones/urine , Postmenopause/urine , Premenopause/urine , Soy Foods , Estradiol/urine , Estrone/urine , Female , Humans , Middle Aged
8.
J Interprof Care ; 32(2): 196-202, 2018 Mar.
Article in English | MEDLINE | ID: mdl-29161164

ABSTRACT

There have been few studies comparing the attitudes towards healthcare teams between different universities. This study analysed the differences in attitudes towards healthcare teams between health science students at Gunma University, Japan, which implements a comprehensive interprofessional education (IPE) programme, and Kanazawa University, a similar national university. Study populations were first- and third-year students at the Gunma University School of Health Sciences and the Kanazawa University School of Health Sciences. The present study was performed just after the IPE and multi-professional education subjects at Gunma University in the first term of the 2012 academic year. The first-year students were different cohort from the third-year students. The modified Attitudes Toward Health Care Teams Scale (ATHCTS) was used to measure attitudes towards healthcare teams. The overall mean score on the modified ATHCTS of students at Gunma University was significantly higher than that of those at Kanazawa University. In both first- and third-year students, the regression factor score of "patient-centred care" was significantly higher at Gunma University than at Kanazawa University. Based on the present study, it can be stated that IPE may foster the value of collaborative practice (CP) among health science students.


Subject(s)
Interprofessional Relations , Patient Care Team/organization & administration , Patient-Centered Care/organization & administration , Students, Health Occupations/psychology , Adult , Cooperative Behavior , Cross-Sectional Studies , Female , Humans , Japan , Male , Young Adult
9.
J Obstet Gynaecol Res ; 44(1): 117-123, 2018 Jan.
Article in English | MEDLINE | ID: mdl-29063724

ABSTRACT

AIM: The aim of this study was to clarify the prevalence and influencing factors of rear seat belt use among pregnant women. METHODS: Questionnaires were given to 1546 pregnant women who visited obstetrics clinics and hospitals for prenatal checkups from October to December 2013. A total of 1494 pregnant women (96.6%) agreed to participate in this study and completed the questionnaire. RESULTS: Fewer than 20% of the rear-seat passengers 'always' used seat belts before and during pregnancy, whereas a third 'never' used a seat belt before or during pregnancy. There was no significant decrease in seat belt use by rear-seat passengers during compared to before pregnancy. Multivariate analysis revealed that age, knowledge of how to use a seat belt during pregnancy, belief in the compulsory use of a rear seat belt and driver behavioral characteristics before pregnancy were associated with rear seat belt use during pregnancy. CONCLUSIONS: The prevalence of fastening seat belts was substantially low. The provision of information regarding proper seat belt use and its role in protecting the fetus may increase use.


Subject(s)
Automobile Driving/statistics & numerical data , Health Knowledge, Attitudes, Practice , Pregnancy/statistics & numerical data , Seat Belts/statistics & numerical data , Adult , Female , Humans , Japan , Prevalence
10.
J Interprof Care ; 30(3): 401-3, 2016 May.
Article in English | MEDLINE | ID: mdl-27152546

ABSTRACT

An interprofessional education (IPE) initiative was recently launched at the University of Health Sciences in the Lao People's Democratic Republic, a country located in southeast Asia. During the process of reviewing the current curriculum, it was realised that the university has been providing a kind of IPE programme for more than a decade. Medical, pharmacy, dentistry, and nursing students were participating together in a community education programme. After identifying the programme's strengths and challenges, a 4-year plan for embedding the IPE concept into the programme was developed. The plan was divided into four phases-sharing the key concepts of IPE, designing the programme, organising the interprofessional programme committee, and evaluating the effectiveness of the programme. In this short article, we describe the process that led to the plan's creation and the experiences from the first two phases already completed.


Subject(s)
Health Personnel/education , Interprofessional Relations , Cooperative Behavior , Humans , Laos , Program Development
11.
J Interprof Care ; 30(2): 175-83, 2016.
Article in English | MEDLINE | ID: mdl-26930464

ABSTRACT

The mandatory interprofessional education (IPE) programme at Gunma University, Japan, was initiated in 1999. A questionnaire of 10 items to assess the students' understanding of the IPE training programme has been distributed since then, and the factor analysis of the responses revealed that it was categorised into four subscales, i.e. "professional identity", "structure and function of training facilities", "teamwork and collaboration", and "role and responsibilities", and suggested that these may take into account the development of IPE programme with clinical training. The purpose of this study was to examine the professional identity acquisition process (PIAP) model in IPE using structural equation modelling (SEM). Overall, 1,581 respondents of a possible 1,809 students from the departments of nursing, laboratory sciences, physical therapy, and occupational therapy completed the questionnaire. The SEM technique was utilised to construct a PIAP model on the relationships among four factors. The original PIAP model showed that "professional identity" was predicted by two factors, namely "role and responsibilities" and "teamwork and collaboration". These two factors were predicted by the factor "structure and function of training facilities". The same structure was observed in nursing and physical therapy students' PIAP models, but it was not completely the same in laboratory sciences and occupational therapy students' PIAP models. A parallel but not isolated curriculum on expertise unique to the profession, which may help to understand their professional identity in combination with learning the collaboration, may be necessary.


Subject(s)
Attitude of Health Personnel , Health Personnel/education , Interprofessional Relations , Social Identification , Students, Health Occupations/psychology , Cooperative Behavior , Female , Group Processes , Humans , Japan , Male , Models, Educational , Patient Care Team/organization & administration , Professional Role
12.
J Interprof Care ; 29(5): 518-9, 2015.
Article in English | MEDLINE | ID: mdl-26091372

ABSTRACT

A previous survey distributed to medical school deans in the Western Pacific Region (WPR) showed positive attitudes toward collaborative practice and interprofessional education (IPE). This study aimed to clarify the present state of IPE and the attitudes of nursing school deans in the WPR. The modified Attitudes Toward Health Care Teams Scale (ATHCTS) and the modified Readiness of healthcare students for Interprofessional Learning Scale (RIPLS) were used. Unexpectedly, the response rate was less than 20%. Deans of nursing schools with IPE courses showed significantly more positive attitudes than those of schools without IPE courses. The mean score of the modified ATHCTS and RIPLS of deans of nursing schools in rural areas were significantly higher than those in urban areas. Compared with medical schools, nursing schools in the WPR pay less attention to IPE and this may be one of the present characteristics of the region.


Subject(s)
Attitude of Health Personnel , Education, Nursing/organization & administration , Health Occupations/education , Interprofessional Relations , Nurse Administrators/psychology , Schools, Nursing/standards , Students, Nursing/psychology , Cooperative Behavior , Health Knowledge, Attitudes, Practice , Humans , Interdisciplinary Studies
13.
J Obstet Gynaecol Res ; 40(12): 2201-3, 2014 Dec.
Article in English | MEDLINE | ID: mdl-25130255

ABSTRACT

A 43-year-old woman (gravida 0, para 0) was diagnosed with thyroid carcinoma and had been receiving radioactive iodine for remnant ablation. Eventually, her pregnant status became apparent; during radiation, she was at 5 gestational weeks. She decided to continue the pregnancy and delivered a boy of 2362 g at 37 gestational weeks. The infant did not present thyroid dysfunction or developmental abnormalities at 2 months of age. The patient was in the early pregnancy stage during radiation, so the fetus did not develop radiation-related damage of the thyroid gland because at this stage, the fetal thyroid does not concentrate iodine. Although the mother had received radioactive iodine during the critical organogenesis period, the fetus did not develop teratogenicity because the radiation was administered at the borderline threshold for teratogenicity. This case suggests the importance of iodine thyroid absorption when considering radiation-related damage to the fetal thyroid gland during early pregnancy.


Subject(s)
Fetal Development/radiation effects , Iodine/adverse effects , Prenatal Exposure Delayed Effects , Radiopharmaceuticals/adverse effects , Adult , Female , Humans , Infant, Newborn , Iodine Radioisotopes/adverse effects , Male , Pregnancy , Pregnancy Trimester, First , Term Birth
14.
J Interprof Care ; 28(4): 285-91, 2014 Jul.
Article in English | MEDLINE | ID: mdl-24646205

ABSTRACT

The interprofessional education (IPE) program at Gunma University, Maebashi, Japan, uses a lecture style for first-year students and a training style for third-year students. To investigate the comprehensive implications of IPE, the change pattern of attitudes toward health care teams was examined longitudinally in pre-qualified students. The modified Attitudes Toward Health Care Teams Scale (mATHCTS) was used. The overall mean score of the mATHCTS improved significantly after the training-style IPE in their third year. Two individual items in the factor "quality of care delivery" decreased significantly during the first year. In contrast, two individual items in the factor "patient-centered care" increased significantly during the third year. These changes over time were confirmed by analyses using regression factor scores. There are at least two independent attitudes toward collaborative practice (CP) or IPE in response to IPE interventions: the attitude toward "value of IPE for health care providers" may response negatively to IPE in the early stages, and the attitude toward "value of IPE for health care receivers" positively in the later stages. These findings suggest that the continuation of mandatory IPE, which must be designed on the basis of students' high expectations for IPE and CP on entry, may result in profound changes in attitudes amongst participating students.


Subject(s)
Attitude of Health Personnel , Cooperative Behavior , Education, Medical, Undergraduate , Health Knowledge, Attitudes, Practice , Interdisciplinary Communication , Cross-Sectional Studies , Humans , Japan , Surveys and Questionnaires
15.
J Interprof Care ; 27(3): 261-8, 2013 May.
Article in English | MEDLINE | ID: mdl-23273387

ABSTRACT

The goal of effective interprofessional education (IPE) is high-quality patient-care delivery and attaining a high level of patient satisfaction in clinical settings. We aimed to examine if alumni who have studied in an IPE program at a pre-licensure stage maintain a positive attitude toward collaborative practice (CP) in the postgraduate clinical experience. This paper presents a cross-sectional descriptive study which employed the modified attitudes toward health care teams scale (ATHCTS) to examine the relationship between exposure to clinical practice and the attitudes toward interprofessional healthcare teams. Results indicated that the overall mean score of alumni was significantly lower than that of undergraduate students on the modified ATHCTS. Only "team efficacy" had a significantly lower regression factor score in alumni than undergraduate students. Our findings suggest that changes in professional identity in a team may be due to contact with patients after graduation in the postgraduate clinical healthcare experience. The reduction of attitudes toward healthcare teams in the postgraduate clinical experience may be related to "team efficacy". We emphasize the need for in-service IPE for sustaining attitudes and providing a useful CP, which results in good clinical outcome.


Subject(s)
Attitude of Health Personnel , Health Personnel/psychology , Interprofessional Relations , Patient Care Team/organization & administration , Students, Health Occupations/psychology , Cross-Sectional Studies , Humans
17.
J Interprof Care ; 26(2): 100-7, 2012 Mar.
Article in English | MEDLINE | ID: mdl-22251234

ABSTRACT

The interprofessional education (IPE) program at Gunma University, Maebashi, Japan, implements a lecture style for the first-year students and a training style for the third-year students. Changes in the scores of modified Attitudes Toward Health Care Teams Scale (ATHCTS) and those of modified Readiness of health care students for Interprofessional Learning Scale (RIPLS) at the beginning and the end of the term were evaluated in the 2008 academic year. Two hundred and eighty-five respondents of a possible 364 completed the survey. In both the scales, the overall mean scores declined significantly after the lecture-style learning in the first-year students, while the scores improved significantly after the training-style learning in the third-year students. Exploratory factor analysis revealed that the modified ATHCTS was composed of three subscales, and the modified RIPLS two subscales. Analyses using regression factor scores revealed that the scores of "quality of care delivery" subscale in the modified ATHCTS and those of "expertise" subscale in the modified RIPLS declined significantly in the first-year students. Consequently, IPE programs may be introduced early in the undergraduate curriculum to prevent stereotyped perceptions for IPE, and comprehensive IPE curricula may result in profound changes in attitudes among participating students.


Subject(s)
Health Occupations/education , Interdisciplinary Studies , Patient Care Team/organization & administration , Quality of Health Care/organization & administration , Students, Health Occupations/psychology , Attitude , Humans , Interprofessional Relations , Japan , Patient Care Team/standards , Quality of Health Care/standards
18.
J Obstet Gynaecol Res ; 37(3): 267-9, 2011 Mar.
Article in English | MEDLINE | ID: mdl-21314806

ABSTRACT

Lymphangioleiomyomatosis (LAM) is a rare, systemic disorder that predominantly affects women. Although patients with LAM mostly present with pulmonary symptoms, some patients may present initially with extrapulmonary symptoms. We present a case of a 30-year-old Japanese female with abdominal pain during menstrual periods was suspected of having ovarian cancer due to exaggerated ascites observed at a local clinic. Subsequently, she was transferred to our hospital for further investigations, and was diagnosed with LAM. Three years after diagnosis, she had a girl by cesarean section to avoid the progression of pulmonary LAM by vaginal delivery. The patient is undergoing follow-up treatment with the administration of gonadotropin-releasing hormone-analog. Though LAM is rare, gynecologists should know about it because it may occur with gynecological symptoms in young women.


Subject(s)
Lymphangioleiomyomatosis/diagnosis , Adult , Chylous Ascites , Diagnosis, Differential , Female , Humans , Lung Diseases/diagnosis , Lung Diseases/therapy , Lymphangioleiomyomatosis/pathology , Lymphangioleiomyomatosis/therapy , Ovarian Neoplasms , Pelvis/pathology , Pregnancy , Pregnancy Complications , Pregnancy Outcome , Tomography, X-Ray Computed
19.
Gynecol Obstet Invest ; 69(3): 169-73, 2010.
Article in English | MEDLINE | ID: mdl-20016189

ABSTRACT

BACKGROUND: To estimate the normal level of adrenomedullin (AM) during multiple pregnancy. METHODS: The study population consisted of 5 women with normal cycles, 130 women with normal pregnancy between 6 and 40 weeks of gestation, 93 women with twin pregnancy and 42 women with triplet pregnancy. RESULTS: Total AM concentration in the first trimester (13.7 +/- 0.58 fmol/ml), second trimester (26.8 +/- 1.13 fmol/ml) and third trimester (37.8 +/- 1.32 fmol/ml) in pregnant women was significantly higher than that in nonpregnant women (8.0 +/- 0.71 fmol/ml). In each trimester, the maternal plasma concentrations of triplet-pregnant women were significantly higher than in twin and singleton-pregnant women. Umbilical venous AM levels (29.9 +/- 2.63 fmol/ml) were higher than umbilical arterial AM (20.2 +/- 2.04 fmol/ml). CONCLUSION: Since alterations in the AM concentration in maternal plasma may mediate compensatory vascular responses in the uterine circulation, it might be useful to know the normal level of AM during multiple pregnancy in order to detect abnormalities during multiple pregnancy.


Subject(s)
Adrenomedullin/blood , Placental Circulation/physiology , Pregnancy, Multiple/blood , Regional Blood Flow/physiology , Uterus/blood supply , Female , Humans , Pregnancy , Pregnancy Trimester, First/blood , Pregnancy Trimester, Second/blood , Pregnancy Trimester, Third/blood , Radioimmunoassay , Reference Values
20.
J Clin Endocrinol Metab ; 88(3): 1194-204, 2003 Mar.
Article in English | MEDLINE | ID: mdl-12629106

ABSTRACT

Activating mutations of the human lutropin/choriogonadotropin receptor (hLHR), a Gs-coupled receptor, have been identified in young boys with gonadotropin-independent precocious puberty (testotoxicosis). The properties of these mutants have typically been characterized in heterologous cells transfected with recombinant mutant receptor and compared with those expressing wild-type (wt) receptor. The affected individuals, however, are heterozygous and, therefore, express wt receptor in addition to the mutant receptor. The present studies were undertaken to determine what effects, if any, coexpression of a constitutively active hLHR might have on hLHR(wt). HEK 293 cells were cotransfected with hLHR(wt) and hLHR(L457R), a mutant that we have previously shown to be both constitutively active and unresponsive to further hormonal stimulation as determined in both intact cells and isolated membranes. When coexpressed at submaximal concentrations, L457R does not decrease the cell surface expression of hLHR(wt). Coexpression of L457R, however, causes an attenuation of human choriogonadotropin-stimulated cAMP production by hLHR(wt). We show that this attenuation is caused by an activation of the phosphodiesterase (PDE)4D3. Additional experiments demonstrate that the coexpression of L457R with the human beta(2)-adrenergic receptor causes an attenuation of isoproterenol-stimulated cAMP and that other activating mutations of the hLHR also induce PDE activation. Taken together, these data demonstrate that the activation of PDE is a compensatory mechanism common to hLHR constitutively active mutants and that cellular responses to agonists that stimulate Gs-coupled receptors may be blunted in tissues expressing these activating mutants. This novel desensitizing effect of constitutively active hLHRs on hormone-stimulated cAMP production has not been noticed before and would typically not be detected because of the routine inclusion of PDE inhibitors in experiments determining cAMP accumulation. Importantly, however, this mechanism of desensitization would be expected to occur in a physiological context in which PDE inhibitors are not present and thus may influence hormonal signaling in cells expressing the activating hLHR mutant.


Subject(s)
GTP-Binding Protein alpha Subunits, Gs/physiology , Receptors, LH/physiology , 3',5'-Cyclic-AMP Phosphodiesterases/metabolism , Cells, Cultured , Chorionic Gonadotropin/pharmacology , Cyclic AMP/biosynthesis , Cyclic Nucleotide Phosphodiesterases, Type 4 , Humans , Mutation , Receptors, LH/analysis
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