RESUMEN
BACKGROUND: Parenting an adolescent with borderline personality disorder (BPD) features can be challenging due to, for example, emotional dysregulation, impulsivity and/or self-destructive behavior. Parents confronted with challenging behavior of their child, may experience less parental-self-efficacy (PSE). Subsequently this lower PSE might strengthen the relationship between low parental support and BPD features. AIM: To increase our understanding of the association between parenting related factors and features of BPD in adolescents. METHOD: The sample consisted of 81 adolescents, in the age of 13-21, from a clinical population and their parents. Parents completed (online) questionnaires on parental self-efficacy and adolescents reported on parental support and BPD features. RESULTS: Adolescents who experienced lower parental support reported more BPD features. Lower parental self-efficacy was not related to BPD features in adolescence, but (more) self-efficacy was related to (older) age. Subsequently no evidence was found for a combined effect of perceived parental support and parental self-efficacy on adolescent BPD features. CONCLUSION: Adolescents in a clinical population with higher levels of BPD perceived lower levels of parental support. Parental self-efficacy was not related to levels of BPD. This research is a first step in understanding parenting related factors and BPD features. Longitudinal research is needed to gain more insight in transactions between parenting related factors and symptoms of adolescent BPD.
Asunto(s)
Trastorno de Personalidad Limítrofe , Adolescente , Niño , Emociones , Humanos , Responsabilidad Parental , Padres , AutoeficaciaRESUMEN
BACKGROUND For a long time there was controversy and reservations with regards to diagnosing borderline personality disorder (BPD) under the age of eighteen. Progress in scientific knowledge has shown that adolescence is a key phase in the understanding of the development of the disorder.
AIM: To contribute to the understanding of the developmental trajectory of BPD by studying associations between BPD and the interpersonal functioning in adolescence.
METHOD: To study associations between personality, cluster B personality pathology and BPD and associations between BPD and interpersonal functioning, specified in social information processing and relationship quality with parents and peers.
RESULTS: Personality dimensions and social information processing, both independently and together, are related to cluster B personality pathology and BPD. Furthermore, the importance of quality of relationships with parents in relation to BPD is confirmed..
CONCLUSION: The role of social environment is complex in the development of BPD. The results underpin the interpersonal nature of BPD in adolescence as a crucial phase within the psychosocial development.
Asunto(s)
Trastorno de Personalidad Limítrofe/diagnóstico , Trastornos de la Personalidad/diagnóstico , Adolescente , Diagnóstico Diferencial , Emociones , Femenino , Humanos , Relaciones Interpersonales , Masculino , Conducta Social , Percepción Social , Estrés PsicológicoRESUMEN
BACKGROUND: Energy homeostasis and body weight are regulated by a highly complex network involving the brain, the digestive tract, and white adipose tissue (WAT). Knowledge about signaling pathways connecting digestive tract and WAT is limited. Gut hormone ghrelin and adipokine adiponectin are both decreased in obesity and they share a potent effect on insulin sensitivity: both adiponectin and the combination of acylated (AG) and unacylated ghrelin (UAG) improve insulin sensitivity. AIM: In the present study, we evaluated whether acute administration of UAG alone or combined with AG affects adiponectin concentrations. SUBJECTS AND METHODS: Eight morbidly obese non-diabetic subjects were treated with either UAG 200 µg, UAG 100 µg + AG 100 µg (Comb), or placebo in 3 episodes in a double blind randomized cross-over design. Study medication was administered as single iv bolus injections at 09:00 h after an overnight fast. High molecular weight (HMW) and total adiponectin, glucose, insulin, and total ghrelin and AG were measured up to 1 h after administration. RESULTS: HMW and total adiponectin concentrations did not change after administration of either UAG or Comb, nor were they different from placebo. Insulin concentrations decreased significantly after acute administration of Comb, reaching a minimum at 20 min: 58.2 ± 3.9% of baseline. CONCLUSIONS: Acute iv administration of UAG and the combination of UAG and AG in morbidly obese non-diabetic subjects without overt diabetes does not affect total or HMW adiponectin concentrations, neither directly nor indirectly by changing insulin concentrations.
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Adiponectina/sangre , Glucemia/metabolismo , Ghrelina/administración & dosificación , Insulina/metabolismo , Obesidad Mórbida/sangre , Acilación , Adulto , Método Doble Ciego , Femenino , Estudios de Seguimiento , Humanos , Resistencia a la Insulina , Masculino , Persona de Mediana Edad , Peso Molecular , Obesidad Mórbida/tratamiento farmacológico , Obesidad Mórbida/patología , PronósticoRESUMEN
OBJECTIVE: Transsphenoidal surgery (TS) is the primary therapy for Cushing's disease (CD). The aims of this retrospective study were twofold: (i) investigate early and late results of TS for CD, and (ii) evaluate various postoperative tests in order to predict the outcome of TS. METHODS: We reviewed the long-term outcome in 79 patients with CD who underwent TS (median follow-up 84 months, range 6-197). Within 2 weeks after surgery, morning serum cortisol concentrations were obtained (n = 78) and corticotropin-releasing hormone (CRH) (n = 53) and metyrapone tests (n = 72) were performed. Three groups of outcome were identified: sustained remission, early failure (persistent CD), and late relapse. RESULTS: Immediate postoperative remission was achieved in 51 patients (65%), whereas 28 patients (35%) had persistent CD after TS. Ten patients developed recurrent CD after initial remission (20%). Morning cortisol: all relapses but one recorded serum cortisol >50 nmol/l. A cortisol threshold value of 200 nmol/l has a positive predictive value of 79% for immediate surgical failure (negative predictive failure [NPV] 97%). CRH test: CRH-stimulated peak cortisol > or =600 nmol/l predicted early failure in 78% (NPV 100%). All relapses recorded CRH-stimulated peak cortisol >or =485 nmol/l. Metyrapone test: 11-deoxycortisol >or =345 nmol/l predicted an early failure in 86% of cases (NPV 94%). CONCLUSION: Predictive factors of surgical failure are morning cortisol >or =200 nmol/l, 11-deoxycortisol >or =345 nmol/l after metyrapone and CRH-stimulated cortisol >or =600 nmol/l. CRH and/or metyrapone testing are not superior to morning cortisol concentration in the prediction of outcome of TS. Careful long-term follow-up remains necessary independent of the outcome of biochemical testing.
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Hipersecreción de la Hormona Adrenocorticotrópica Pituitaria (HACT)/diagnóstico , Hipersecreción de la Hormona Adrenocorticotrópica Pituitaria (HACT)/cirugía , Pruebas de Función Hipofisaria , Hipófisis/cirugía , Adulto , Hormona Liberadora de Corticotropina , Supervivencia sin Enfermedad , Femenino , Estudios de Seguimiento , Humanos , Hidrocortisona/sangre , Hidrocortisona/orina , Estimación de Kaplan-Meier , Masculino , Metirapona , Hipersecreción de la Hormona Adrenocorticotrópica Pituitaria (HACT)/mortalidad , Complicaciones Posoperatorias , Valor Predictivo de las Pruebas , Cuidados Preoperatorios , Estudios Retrospectivos , Sensibilidad y Especificidad , Resultado del TratamientoRESUMEN
Ectopic adrenocorticotropin (ACTH) secretion accounts for less than 10% of all causes of endogenous Cushing's syndrome (CS) and is usually associated with neuroendocrine tumors and small cell carcinoma of the lung. We report the case of a 62-year-old man with CS due to ectopic ACTH production by small cell carcinoma of the prostate. He presented with severe hypercortisolism and associated symptoms. Plasma neuron specific enolase (NSE) was grossly elevated. Despite performing a laparoscopic bilateral adrenalectomy, the patient died as a result of sepsis with multi-organ failure. Post-mortem immunohistochemical staining of prostate tumor tissue showed ACTH expression. ACTH staining was also performed in four additional patients with small cell carcinoma of the urinary tract without CS. None of these additional cases showed a positive staining for ACTH. Although a rare cause of ectopic ACTH production, neuroendocrine prostate carcinoma should be considered in male patients with Cushing's syndrome, in particular in those with an occult source of ACTH overproduction.
Asunto(s)
Hormona Adrenocorticotrópica/metabolismo , Síndrome de Cushing/etiología , Síndrome de Cushing/metabolismo , Neoplasias de la Próstata/complicaciones , Neoplasias de la Próstata/metabolismo , Carcinoma Pulmonar de Células Pequeñas/metabolismo , Síndrome de Cushing/patología , Resultado Fatal , Humanos , Masculino , Persona de Mediana EdadRESUMEN
BACKGROUND: A growing interest exists in mechanisms involved in behaviour problems in children with mild intellectual disabilities and borderline intelligence (MID/BI). Social problem solving difficulties have been found to be an explanatory mechanism for aggressive behaviour in these children. However, recently a discrepancy was found between automatic and reflective responding in social situations. We hypothesise that low impulse control and aggressive social problem solving strategies together may explain mechanisms involved in aggressive behaviour by children with MID/BI. METHOD: In a clinical sample of 130 children with MID/BI receiving intramural treatment, main, moderating and mediating effects of impulse control and aggressive response generation on aggressive behaviour were examined by conducting hierarchical linear multiple regression analyses. RESULTS: Independent main effects of both impulse control and aggressive response generation on aggressive behaviour were found. Results indicated that low impulse control and aggressive response generation each explain unique variance in aggressive behaviour. CONCLUSIONS: As this study is the first that has shown both impulse control and aggressive response generation to be important predictors for aggressive behaviour in children with MID/BI, future research should further examine the nature of relations between low impulse control and social problem solving.
Asunto(s)
Trastornos Disruptivos, del Control de Impulso y de la Conducta/epidemiología , Discapacidad Intelectual/epidemiología , Inteligencia , Discapacidades para el Aprendizaje/epidemiología , Adolescente , Niño , Comorbilidad , Estudios Transversales , Trastornos Disruptivos, del Control de Impulso y de la Conducta/diagnóstico , Trastornos Disruptivos, del Control de Impulso y de la Conducta/terapia , Educación de las Personas con Discapacidad Intelectual , Femenino , Hospitalización , Humanos , Incidencia , Discapacidad Intelectual/diagnóstico , Discapacidad Intelectual/terapia , Discapacidades para el Aprendizaje/diagnóstico , Discapacidades para el Aprendizaje/psicología , Masculino , Países Bajos , Solución de Problemas , Trastorno de la Conducta Social/diagnóstico , Trastorno de la Conducta Social/epidemiología , Trastorno de la Conducta Social/terapia , Medio SocialRESUMEN
BACKGROUND: Dysregulation of the hypothalamic-pituitary-adrenal axis has been suggested as an independent risk factor for ischemic heart disease. The aim of our study was to evaluate whether two markers of the hypothalamic-pituitary-adrenal axis activity, the level of salivary cortisol and the diurnal salivary cortisol pattern, are associated with atherosclerosis of the carotid arteries in an elderly population. METHODS AND RESULTS: A total of 1866 participants of the Rotterdam Study, a population-based cohort study in the elderly, provided four salivary cortisol samples throughout 1 d, and underwent ultrasonography to examine the presence of plaques in the common, internal, and bifurcation sites of both carotid arteries. Two summary measures of the separate cortisol values were computed: area under the curve (AUC), which is a measure of total cortisol exposure while awake; and the slope, which is a measure of diurnal cortisol decline. RESULTS: Total cortisol exposure while awake (AUC) was associated with higher plaque scores (beta = 0.08 per sd of AUC, 95% confidence interval 0.00-0.16; P = 0.04) in a fully adjusted linear regression model. Persons with an AUC in the highest tertile had a higher number of plaques of carotid arteries compared with those in the lowest tertile (3.08 vs. 2.80, 95% confidence interval of difference 0.09-0.48; P = 0.005). There was no relation between diurnal cortisol decline and plaque score. CONCLUSION: Our results support the hypothesis that increased total cortisol exposure is independently associated with atherosclerosis of the carotid arteries.
Asunto(s)
Aterosclerosis/diagnóstico por imagen , Enfermedades de las Arterias Carótidas/diagnóstico por imagen , Hidrocortisona/análisis , Saliva/química , Anciano , Anciano de 80 o más Años , Aterosclerosis/epidemiología , Aterosclerosis/patología , Aterosclerosis/fisiopatología , Enfermedades de las Arterias Carótidas/epidemiología , Enfermedades de las Arterias Carótidas/patología , Enfermedades de las Arterias Carótidas/fisiopatología , Ritmo Circadiano , Estudios de Cohortes , Femenino , Humanos , Sistema Hipotálamo-Hipofisario/fisiología , Masculino , Persona de Mediana Edad , Sistema Hipófiso-Suprarrenal/fisiología , Ultrasonografía , Vigilia/fisiologíaRESUMEN
OBJECTIVE: The objective of the study was to assess whether weekly administration of 40 mg pegvisomant (PEG-V) improves quality of life (QoL) and metabolic parameters in acromegalic patients with normal age-adjusted IGF-I concentrations during long-acting somatostatin analog (SSA) treatment. DESIGN: This was a prospective, investigator-initiated, double blind, placebo-controlled, crossover study. Twenty acromegalic subjects received either PEG-V or placebo for two consecutive treatment periods of 16 wk, separated by a washout period of 4 wk. Efficacy was assessed as change between baseline and end of each treatment period. QoL was assessed by the Acromegaly Quality of Life Questionnaire (AcroQoL) and the Patient-Assessed Acromegaly Symptom Questionnaire (PASQ). RESULTS: The AcroQoL (P = 0.008) and AcroQoL physical (P = 0.002) improved significantly after PEG-V was added. The addition of PEG-V also significantly improved the PASQ (P = 0.038) and the single PASQ questions, perspiration (P = 0.024), soft tissue swelling (P = 0.036), and overall health status (P = 0.035). No significant change in Z-score of IGF-I (P = 0.34) was observed during addition of PEG-V. Transient liver enzyme elevations were observed in five subjects (25%). CONCLUSION: Improvement in quality of life was observed without significant change in IGF-I after the addition of 40 mg pegvisomant weekly to monthly SSA therapy in acromegalic patients who had normalized IGF-I on SSA monotherapy. These data question the current recommendations in how to assess disease activity in acromegaly. Moreover, the findings question the validity of the current approach of medical treatment in which pegvisomant is used only when SSA therapy has failed to normalize IGF-I.
Asunto(s)
Acromegalia/tratamiento farmacológico , Antagonistas de Hormonas/administración & dosificación , Hormona de Crecimiento Humana/análogos & derivados , Calidad de Vida , Somatostatina/análogos & derivados , Acromegalia/psicología , Adulto , Anciano , Estudios Cruzados , Método Doble Ciego , Esquema de Medicación , Combinación de Medicamentos , Femenino , Antagonistas de Hormonas/efectos adversos , Hormona de Crecimiento Humana/administración & dosificación , Hormona de Crecimiento Humana/efectos adversos , Humanos , Masculino , Persona de Mediana Edad , Placebos , Somatostatina/administración & dosificación , Somatostatina/efectos adversos , Factores de TiempoRESUMEN
CONTEXT: Increased mortality in patients with pituitary tumors after surgical treatment has been reported. However, it is unknown to what extent excess mortality is caused by pituitary tumors and their treatment in general and to what extent by previous exposure to hormonal overproduction. OBJECTIVE: The aim of the study was to compare mortality between patients treated for Cushing's disease and nonfunctioning pituitary macroadenomas (NFMAs). DESIGN: This was a follow-up study. PATIENTS: We included 248 consecutive patients with pituitary adenomas treated by transsphenoidal surgery in our hospital for NFMAs (n = 174) and ACTH-producing adenomas (n = 74). The mean duration of follow-up after surgery was 10.1 +/- 7.2 yr for the whole cohort. OUTCOME MEASURES: The standardized mortality ratio (SMR) was calculated for the whole cohort and also for the two diseases separately. Cox regression analysis was used to compare mortality in patients with Cushing's disease with NFMA patients. RESULTS: Patients with Cushing's disease (39.1 +/- 16.1 yr) were significantly younger at time of operation than NFMA patients (55.3 +/- 13.4 yr). The SMR for the whole cohort was 1.41 [95% confidence interval (CI), 1.05-1.86]. The SMR in NFMA patients was 1.24 (95% CI, 0.85-1.74) vs. 2.39 (95% CI, 1.22-3.9) in patients with Cushing's disease. In patients with Cushing's disease, compared with NFMAs, the age-adjusted mortality was significantly increased: hazard ratio 2.35 (95% CI, 1.13-4.09, P = 0.008). CONCLUSIONS: Mortality in patients previously treated for Cushing's disease is increased, compared with patients treated for NFMAs. This implies that previous, transient overexposure to cortisol is associated with increased mortality.
Asunto(s)
Adenoma/mortalidad , Hipersecreción de la Hormona Adrenocorticotrópica Pituitaria (HACT)/mortalidad , Neoplasias Hipofisarias/mortalidad , Adenoma/terapia , Adulto , Anciano , Estudios de Cohortes , Estudios de Seguimiento , Humanos , Persona de Mediana Edad , Hipersecreción de la Hormona Adrenocorticotrópica Pituitaria (HACT)/terapia , Neoplasias Hipofisarias/terapia , Análisis de Supervivencia , Resultado del TratamientoRESUMEN
We report on a patient with acromegaly who developed severe drug-induced hepatitis during combined treatment with the long-acting somatostatin-analog octreotide and the GH receptor antagonist pegvisomant. The hepatic enzyme disturbances normalized after discontinuation of pegvisomant. After rechallenge with monotherapy pegvisomant, however, the hepatic enzyme disturbances reappeared within a few weeks, indicating that most likely pegvisomant alone and not the long-acting somatostatin analog or the combination of these two drugs was responsible for this case of drug-induced hepatitis. Clinicians should be aware of this potential severe adverse drug reaction and therefore frequent control of hepatic enzymes is mandatory during treatment with pegvisomant.
Asunto(s)
Acromegalia/tratamiento farmacológico , Enfermedad Hepática Inducida por Sustancias y Drogas/etiología , Hormona de Crecimiento Humana/análogos & derivados , Octreótido/uso terapéutico , Acromegalia/complicaciones , Alanina Transaminasa/sangre , Aspartato Aminotransferasas/sangre , Hormona de Crecimiento Humana/efectos adversos , Humanos , Hígado/enzimología , Masculino , Persona de Mediana Edad , gamma-Glutamiltransferasa/sangreRESUMEN
Over the past few years, new diagnostic tests for Cushing's syndrome have become available. Some of the other, older diagnostic tests have fallen into discredit as they could not distinguish conditions from one another sufficiently well. New biochemical tests include midnight salivary cortisol measurement and the combined dexamethasone-corticotropin releasing hormone (CRH) test. The high dose dexamethasone test and the CRH-stimulation test have been abandoned as they were unable to differentiate between hypophysial and ectopic secretion of adrenocorticotropic hormone (ACTH). For the detection of ectopic ACTH-secreting tumours new imaging techniques, such as somatostatin receptor scintigraphy and positron emission tomography with 5-hydroxytryptophan, have become available.
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5-Hidroxitriptófano , Síndrome de Cushing/diagnóstico , Imagen por Resonancia Magnética/métodos , Tomografía de Emisión de Positrones/métodos , Hormona Liberadora de Corticotropina , Dexametasona , Diagnóstico Diferencial , Humanos , Hidrocortisona/análisis , Sensibilidad y EspecificidadRESUMEN
Several new therapeutic options both medicinal and surgical, have emerged for the treatment of Cushing's syndrome. In Cushing's disease caused by an adrenocorticotropin (ACTH) secreting pituitary adenoma, the introduction ofendoscopic pituitary surgery offers better visualization of the sella than does the traditional explorative surgery. However, at present it is unclear whether this will result in a better outcome. New drugs under investigation include universal somatostatin analogues such as SOM230, and a combination of a somatostatin analogue and dopamine agonist known as dopastatin. These agents may also be effective for the medicinal treatment of ectopic ACTH-secretion. Treatment with radioactive-labelled somatostatin-analogues such as 177lutetium octreotate is another option for these patients. The primary treatment for ACTH-independent Cushing's syndrome is laparoscopic adrenalectomy. In rare cases of bilateral adrenal hyperplasia, medicinal treatment aimed at new regulatory pathways of cortisol secretion can be applied.
Asunto(s)
Adenoma Hipofisario Secretor de ACTH/terapia , Adenoma/terapia , Síndrome de Cushing/terapia , Adenoma Hipofisario Secretor de ACTH/tratamiento farmacológico , Adenoma Hipofisario Secretor de ACTH/cirugía , Adenoma/tratamiento farmacológico , Adenoma/cirugía , Adrenalectomía , Antagonistas Adrenérgicos/uso terapéutico , Síndrome de Cushing/tratamiento farmacológico , Síndrome de Cushing/cirugía , Humanos , Hipófisis/cirugía , Resultado del TratamientoRESUMEN
To evaluate the pathophysiology of altered cortisol secretion in patients with primary adrenal hypercortisolism, cortisol secretion was investigated in 12 patients, seven with a unilateral adenoma and five with ACTH-independent macronodular adrenal hyperplasia compared with age- and gender-matched controls and with patients with pituitary-dependent hypercortisolism. Pulsatile secretion was increased 2-fold (P = 0.04), attributable to increased event frequency (P = 0.002). All patients showed a significant diurnal rhythm with a delay in phase shift of 3 h (P = 0.01). Approximate entropy ratio, a feedback-sensitive measure, was increased compared with controls (P = 0.00003) but similar to that of pituitary-dependent hypercortisolism (P = 0.77), denoting loss of autoregulation. Cortisol burst-mass tended to be smaller in patients with ACTH-independent macronodular adrenal hyperplasia than in unilateral adenoma (P = 0.06). In conclusion, increased cortisol secretion in patients with primary adrenal Cushing's syndrome is caused by amplified pulsatile secretion via event frequency modulation. We speculate that partial preservation of secretory regularity and diurnal rhythmicity point to incomplete autonomy of these tumors.
Asunto(s)
Ritmo Circadiano , Síndrome de Cushing/metabolismo , Síndrome de Cushing/fisiopatología , Hidrocortisona/sangre , Hidrocortisona/metabolismo , Adenoma/metabolismo , Adenoma/patología , Adenoma/fisiopatología , Neoplasias de las Glándulas Suprarrenales/metabolismo , Neoplasias de las Glándulas Suprarrenales/patología , Neoplasias de las Glándulas Suprarrenales/fisiopatología , Glándulas Suprarrenales/metabolismo , Glándulas Suprarrenales/patología , Adulto , Anciano , Síndrome de Cushing/patología , Entropía , Femenino , Humanos , Masculino , Persona de Mediana EdadRESUMEN
To evaluate the long-term impact of cured Cushing's disease on subjective well-being, we assessed quality of life by validated health-related questionnaires in 58 patients cured from Cushing's disease by transsphenoidal surgery (n = 58), some of whom received additional radiotherapy (n = 11) and/or bilateral adrenalectomy (n = 3). The mean duration of remission was 13.4 +/- 6.7 yr (range of 2-25 yr). Patient data were compared with a control group of 98 healthy subjects with the same age and sex distribution and with age-adjusted reference values available from the literature. General perceived well-being, measured by the Nottingham Health Profile and the Short Form, was reduced compared with controls for all subscales (P < 0.001). Patients with Cushing's disease had worse scores on subscales of fatigue Multidimensional Fatigue Index and anxiety and depression (Hospital Anxiety and Depression Scale). Compared with reference values from the literature, quality of life was also reduced in the patients according to all questionnaires and all items, except pain (Short Form), sleep (Nottingham Health Profile), and reduced activity (Multidimensional Fatigue Index). Despite conventional hormone replacement therapy, hypopituitarism was an important independent predictor of reduced quality of life. Patients without hypopituitarism (n = 28) showed reduced scores on physical items but normal scores on mental items compared with controls. In conclusion, despite long-term cure of Cushing's disease, patients experience a considerable decrease in quality of life, with physical and psychosocial impairments, especially in the presence of hypopituitarism.
Asunto(s)
Hipersecreción de la Hormona Adrenocorticotrópica Pituitaria (HACT)/fisiopatología , Hipersecreción de la Hormona Adrenocorticotrópica Pituitaria (HACT)/psicología , Calidad de Vida , Adrenalectomía , Femenino , Estudios de Seguimiento , Humanos , Hidrocortisona/orina , Hipopituitarismo/epidemiología , Masculino , Persona de Mediana Edad , Hipersecreción de la Hormona Adrenocorticotrópica Pituitaria (HACT)/terapia , Valores de Referencia , Encuestas y CuestionariosRESUMEN
The sex steroid 17beta-estradiol (17beta-E2) has a broad range of actions, including effects on calcium and bone metabolism. This study with 3-month-old Brown Norway rats was designed to investigate the role of 17beta-E2 in the regulation of calcium homeostasis. Rats were divided in four groups, sham-operated, ovariectomized (OVX), and OVX supplemented with either a 0.025-mg or 0.05-mg 17beta-E2 pellet implanted subcutaneously. After 4 weeks, in none of the groups was serum calcium, phosphate, or parathyroid hormone altered compared with the sham group, while only in the OVX rats was a significant reduction in urinary calcium found. Bone mineral density and osteocalcin were modified, as can be expected after OVX and 17beta-E2 supplementation. OVX resulted in a nonsignificant increase in serum 1,25-dihydroxyvitamin D3 (1,25(OH)2D3). Supplementation with either one of the 17beta-E2 dosages resulted in an 80% reduction of 1,25(OH)2D3 and only a 20% reduction in 25-hydroxyvitamin D3 levels. OVX, as well as supplementation with 17beta-E2, did not affect serum levels of vitamin D binding protein. As a consequence, the estimated free 1,25(OH)2D3 levels were also significantly decreased in the 17beta-E2-supplemented group compared with the sham and OVX groups. Next, the consequences for intestinal calcium absorption were analyzed by the in situ intestinal loop technique. Although the 1,25(OH)2D3 serum level was increased, OVX resulted in a significant decrease in intestinal calcium absorption in the duodenum. Despite the strongly reduced 1,25(OH)2D3 levels (18. 1 +/- 2.1 and 16.4 +/- 2.2 pmol/l compared with 143.5 +/- 29 pmol/l for the OVX group), the OVX-induced decrease in calcium absorption could partially be restored by supplementation with either 0.025 mg or 0.05 mg of 17beta-E2. None of the treatments resulted in a significant change in calcium handling in the jejunum, although the trends were similar as those observed in the duodenum. 17beta-E2 did not change the VDR levels in both the intestine and the kidney. In conclusion, the present study demonstrates that 17beta-E2 is positively involved in intestinal calcium absorption, and the data strengthen the assertion that 17beta-E2 exerts this effect independent of 1,25(OH)2D3. In general, 17beta-E2 not only affects bone turnover but also calcium homeostasis via an effect on intestinal calcium absorption. (J Bone Miner Res 1999;14:57-64)
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Calcitriol/metabolismo , Calcio/farmacocinética , Estradiol/fisiología , Absorción Intestinal/fisiología , Animales , Transporte Biológico/fisiología , Densidad Ósea/fisiología , Huesos/metabolismo , Calbindinas , Femenino , Homeostasis , Riñón/metabolismo , Ovario/fisiología , Hormona Paratiroidea/fisiología , Ratas , Ratas Endogámicas BN , Proteína G de Unión al Calcio S100/metabolismoRESUMEN
Rat recipients of renal allografts and unilaterally nephrectomized control rats were studied to evaluate the response in blood pressure to prednisolone in diverse doses, and to determine the dosage required to achieve adequate immunosuppression without undue complication of hypertension. While a continuous infusion of 2 mg/kg/day or more of prednisolone proved effective in prolonging allograft survival time, this dosage increased the blood pressure of recipients as well as unilaterally nephrectomized control rats. In contrast to control rats, the recipients remained hypertensive after the cessation of prednisolone administration. This suggests that the high blood pressure observed during prednisolone administration was due to its hypertensive action. On the other hand, the high blood pressure remaining after cessation of the prednisolone administration is likely to be caused by an incomplete prevention of rejection. If recipients had received a transfusion of donor-strain blood prior to transplantation in combination with the infusion of 2 mg/kg/day or more of prednisolone, they became normotensive when the prednisolone infusion was ceased. By reducing the prednisolone dosage to 1 mg/kg/day in combination with donor-strain blood pretreatment, hypertension could also be eliminated during the first two weeks. In conclusion, effective immuno suppression can be achieved with prednisolone in rats, without inducing hypertension, provided prednisolone is administered at a low dosage in combination with adjuvant immunosuppression--i.e., donor-strain blood pretreatment.
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Hipertensión/etiología , Inmunosupresores/toxicidad , Trasplante de Riñón , Complicaciones Posoperatorias/etiología , Prednisolona/toxicidad , Animales , Transfusión Sanguínea , Tasa de Filtración Glomerular , Refuerzo Inmunológico de Injertos , Rechazo de Injerto/efectos de los fármacos , Hipertensión/inducido químicamente , Inmunosupresores/administración & dosificación , Masculino , Complicaciones Posoperatorias/inducido químicamente , Prednisolona/administración & dosificación , Ratas , Ratas Endogámicas BN/inmunología , Ratas Endogámicas/inmunología , Trasplante HomólogoRESUMEN
Little attention has been paid to the changes in renal function that occur after kidney transplantation when donor and recipient differ markedly in size. We studied this phenomenon after isogeneic kidney transplantation in rats of varying body weight (BW). Renal functional parameters, such as the glomerular filtration rate (GFR), the effective renal plasma flow (ERPF), and the plasma levels of creatinine (Pcr) and urea (Pur) were determined at regular intervals following transplantation. In the initial experimental series, juvenile (BW approximately 150 g) and adult (BW approximately 300 g) rats were used. Four groups of transplant recipients were studied. These consisted of 2 groups of adult recipients of juvenile or adult donor kidneys, and 2 groups of juvenile recipients of juvenile or adult donor kidneys. These 4 groups were compared with adult and juvenile control rats, as well as with unilaterally nephrectomized (NX) rats. A comparison between the 2 groups of juvenile recipients revealed no significant difference in the GFR, ERPF, Pcr, or Pur levels after the transplantation of adult or juvenile donor kidneys. Nor were any significant differences found when comparing the functional parameters of the 2 groups of adult recipients after transplantation of adult or juvenile donor kidneys. The transplanted kidneys generally functioned at a level amounting to 80-90% of the GFR and 90-100% of the ERPF of NX rats of comparable BW. These observations are a clear indication of functional adaptation after kidney transplantation. The compensatory functional response is augmented--in case of a young donor kidney transplanted into an adult recipient, or attenuated--in case of an adult donor kidney transplanted into a juvenile recipient. In an additional experiment, kidneys were transplanted from very young rats (BW approximately 50 g) to adult recipients. It appeared that as early as two weeks after transplantation, renal function had reached adult kidney levels, as observed in the first experimental series. In conclusion, after isogeneic kidney transplantation in rats, the transplanted kidney generally adapts rapidly to the size of the recipient and functions like an inherent part of the recipient's body.
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Peso Corporal , Trasplante de Riñón , Envejecimiento , Animales , Creatinina/sangre , Tasa de Filtración Glomerular , Riñón/fisiología , Masculino , Ratas , Ratas Endogámicas , Circulación Renal , Urea/sangreRESUMEN
The renal handling of technetium-99m dimercaptosuccinic acid ([99mTc]DMSA) was studied in rats before and after treatment with Na-maleate (2 mmol/kg i.v.). In the control period, when measured 2 hr after the intravenous injection of [99mTc]DMSA, 39.9% of the injected dose was in the kidneys and 14.6% was in the bladder. After Na-maleate treatment, only 6.4% of the injected dose of [99mTc]DMSA was retained in the kidneys while 37.9% was found in the bladder. Subsequent studies revealed that Na-maleate produced a fall in the glomerular filtration rate, the effective renal plasma flow, and a generalized proximal tubular dysfunction. The latter was characterized by polyuria and an increased excretion of glucose, protein, albumin, calcium, and inorganic phosphate. It was concluded that proximal tubular dysfunction markedly alters the renal handling of [99mTc]DMSA. Whether this augmented urinary excretion is due to an inhibition of reabsorption or an enhanced cellular efflux of [99mTc]DMSA remains to be answered.
Asunto(s)
Síndrome de Fanconi/diagnóstico por imagen , Riñón/metabolismo , Succímero , Compuestos de Sulfhidrilo , Tecnecio , Animales , Síndrome de Fanconi/inducido químicamente , Síndrome de Fanconi/fisiopatología , Tasa de Filtración Glomerular , Riñón/diagnóstico por imagen , Masculino , Maleatos/toxicidad , Cintigrafía , Ratas , Ratas Endogámicas , Circulación Renal , Ácido Dimercaptosuccínico de Tecnecio Tc 99mRESUMEN
In a longitudinal study, Q-sort patterns of German preschool children were analyzed for personality prototypes and related to developmental outcomes up to age 12. Q-factor analyses confirmed 3 prototypic patterns that showed a high continuity and cross-judge consistency; were similar to those found for North American, Dutch, and Icelandic children; and can be interpreted as resilient, overcontrolled, and undercontrolled. Relations reported by R. W. Robins, O. P. John, A. Caspi, T. E. Moffitt, & M. Stouthamer-Loeber (1996) between these 3 patterns and the Big Five were fully replicated. Growth curve analyses showed that the 3 patterns predicted important developmental outcomes in both the social and the cognitive domains. Evidence was found for both traits and types: A continuous dimension of resiliency bifurcates in its lower part into two relatively discrete personality types, overcontrollers and undercontrollers.
Asunto(s)
Desarrollo de la Personalidad , Personalidad , Niño , Preescolar , Cognición/fisiología , Femenino , Estudios de Seguimiento , Humanos , Inteligencia , Pruebas de Inteligencia , Masculino , Psicología Infantil , Reproducibilidad de los Resultados , Autoimagen , Caracteres Sexuales , Encuestas y CuestionariosRESUMEN
Twenty-two patients with invasive cervical cancer had ovarian transposition. Fifteen patients received whole pelvic external radiation therapy via a teletherapy unit, and nine patients also received one or two intracavitary insertions. Ovarian function was measured by serum gonadotropins, FSH, and LH. We were unable to measure gonadotropin levels in four patients because they were lost to follow-up after completion of radiation therapy. Five patients developed postmenopausal symptoms; in two the ovaries were not shielded and they received radiation by lateral ports with an average dose above 2500 cGY. Therefore, ovarian function was preserved in seven of 11 patients (64%), all of whom received = 500 cGY with an average dose of 250 cGY to the ovaries via external radiation and intracavitary insertion(s). FSH values ranged from 3.3 to 38.8 mlU ml-1 (mean = 17.7 mlU ml-1). Two patients developed symptomatic ovarian cysts. Ovarian function can be preserved by transposing the ovaries at the time of surgery prior to radiation with adequate treatment planning which limits the radiation dose to the ovaries to =300 cGY.