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A growing body of evidence indicates the role of melatonin (MT) in the pathogenesis of multiple sclerosis (MS): It modulates immune function, alleviates oxidative stress and it is linked to seasonality of MS relapse. This report addresses the potential clinical relevance of circadian MT rhythms in relapsing-remitting MS (RRMS) patients. The study sample comprised of fifty-five RRMS patients and fifty age- and sex-matched healthy control (HC) subjects. Circadian salivary MT was measured non-invasively at 12 time points over day in participants' home environment. 6-Hydroxy-melatoninsulfate (MT sulfate) concentration in night-time urine was assessed as an estimate for nocturnal MT. Ratings for neurological disability, health-related quality of life (HrQoL), fatigue, depressive symptoms and sleep patterns were additionally obtained. There was no evidence for an overall disturbed MT rhythm in RRMS patients. However, lower MT levels within the first hour after awakening were associated with longer disease duration. MT levels only correlated moderately with neurological disability. Sleep disruptions were more common in patients than in controls and were associated with lower nocturnal MT sulfate levels. MT also correlated moderately with fatigue and HrQoL. We did not find evidence for a generally disturbed circadian MT rhythm in RRMS patients but longer disease duration was associated with significantly lower MT levels. Moreover, MT correlated with a series of clinical features. The exact nature of this relationship remains unclear and future studies are needed in order to determine whether MT could serve as a potential therapeutic target in MS. KEY MESSAGES: Melatonin acts as a free radical scavenger and modulates immune function. In multiple sclerosis, low melatonin levels were associated with acute exacerbations. Melatonin levels are not generally disturbed in multiple sclerosis patients. But lower levels are associated with disease duration and clinical aspects. Salivary melatonin after awakening might serve as a good measure of melatonin.
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Ritmo Circadiano/fisiología , Melatonina/metabolismo , Esclerosis Múltiple/metabolismo , Esclerosis Múltiple/fisiopatología , Adulto , Femenino , Depuradores de Radicales Libres/metabolismo , Humanos , Masculino , Persona de Mediana Edad , Calidad de Vida , Glándulas Salivales/metabolismoRESUMEN
The analysis of volatiles released by marine Salinispora bacteria uncovered a new class of natural compounds displaying an unusual bicyclic [3.1.0]-lactone skeleton. Although only sub-µg quantities of the compounds were available, the combination of analytical methods, computational spectroscopy, and synthesis allowed unambiguous structural identification of the compounds, called salinilactones, without the need for isolation. Orthogonal hyphenated methods, GC/MS and solid-phase GC/IR allowed to propose a small set of structures consistent with the data. A candidate structure was selected by comparison of DFT-calculated IR spectra and the experimental IR-spectrum. Synthesis confirmed the structure and absolute configuration of three bicyclic lactones, salinilactones A-C. The salinilactones are structurally closely related to the A-factor class of compounds, autoregulators from streptomycete bacteria. They exhibited inhibitory activity against Salinispora and Streptomyces strains.
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Actinobacteria/química , Lactonas/química , 4-Butirolactona/análogos & derivados , 4-Butirolactona/química , Actinobacteria/efectos de los fármacos , Antibacterianos/síntesis química , Antibacterianos/química , Antibacterianos/farmacología , Compuestos Bicíclicos con Puentes/síntesis química , Compuestos Bicíclicos con Puentes/química , Compuestos Bicíclicos con Puentes/farmacología , Cromatografía de Gases y Espectrometría de Masas , Lactonas/síntesis química , Lactonas/farmacología , Espectrofotometría Infrarroja , Streptomyces/química , Streptomyces/efectos de los fármacosRESUMEN
We performed a longitudinal case-control study on patients with clinically isolated syndrome (CIS) with the aid of quantitative whole-brain myelin imaging. The aim was (1) to parse early myelin decay and to break down its distribution pattern, and (2) to identify an imaging biomarker of the conversion into clinically definite Multiple Sclerosis (MS) based on in vivo measurable changes of myelination. Imaging and clinical data were collected immediately after the onset of first neurological symptoms and follow-up explorations were performed after 3, 6, and, 12â¯months. The multi-component Driven Equilibrium Single Pulse Observation of T1/T2 (mcDESPOT) was applied to obtain the volume fraction of myelin water (MWF) in different white matter (WM) regions at every time-point. This measure was subjected to further voxel-based analysis with the aid of a comparison of the normal distribution of myelination measures with an age and sex matched healthy control group. Both global and focal relative myelination content measures were retrieved. We found that (1) CIS patients at the first clinical episode suggestive of MS can be discriminated from healthy control WM conditions (pâ¯<â¯0.001) and therewith reproduced our earlier findings in late CIS, (2) that deficient myelination in the CIS group increased in T2 lesion depending on the presence of gadolinium enhancement (pâ¯<â¯0.05), and (3) that independently the CIS T2 lesion relative myelin content provided a risk estimate of the conversion to clinically definite MS (Odds Ratio 2.52). We initially hypothesized that normal appearing WM myelin loss may determine the severity of early disease and the subsequent risk of clinically definite MS development. However, in contrast we found that WM lesion myelin loss was pivotal for MS conversion. Regional myelination measures may thus play an important role in future clinical risk stratification.
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Enfermedades Desmielinizantes/diagnóstico por imagen , Progresión de la Enfermedad , Imagen por Resonancia Magnética/tendencias , Esclerosis Múltiple/diagnóstico por imagen , Fibras Nerviosas Mielínicas/patología , Adulto , Estudios de Casos y Controles , Estudios de Cohortes , Enfermedades Desmielinizantes/fisiopatología , Femenino , Humanos , Estudios Longitudinales , Imagen por Resonancia Magnética/métodos , Masculino , Persona de Mediana Edad , Esclerosis Múltiple/fisiopatología , Valor Predictivo de las Pruebas , Adulto JovenRESUMEN
BACKGROUND: Multiple sclerosis (MS) patients suffer very often from MS fatigue and sleep problems. Despite the detrimental impact on the activities of daily living, a short and objective quantification of fatigue and sleep problems is currently lacking. OBJECTIVE: The objective of the study was to systematically investigate tonic, intrinsic, and phasic alertness and the relationship of these performance-based measures with self-report measures of fatigue and quality of sleep. METHODS: Thirty-three MS patients without (MS-) and 26 with selected comorbid disorders (MS+) and 43 healthy controls (HCs) performed the pupillographic sleepiness test (measuring tonic alertness) and the alertness subtest of the Test of Attentional Performance (measuring intrinsic and phasic alertness). RESULTS: Self-reported and performance-based measures revealed poorer performance for both MS groups compared to HC. MS+ patients presented higher rates of MS fatigue, sleep problems and depressive symptoms but similar alertness scores compared to MS- patients. However, tonic alertness was only higher in MS- patients compared to HC. Intrinsic and phasic alertness correlated moderately with fatigue ratings. CONCLUSION: In the diagnostic process of MS fatigue and quality of sleep comorbid disorders (depression, anemia, thyroid dysfunction) and performance-based measures such as alertness should be considered in daily clinical practice.
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OBJECTIVE: Psychosocial stress has frequently been associated with disease activity and acute exacerbations in multiple sclerosis (MS). Despite this well established finding, strikingly little is known about the acute hypothalamic-pituitary-adrenal (HPA) and sympathetic-adrenal-medullary (SAM) stress response in MS. METHODS: Twenty-six early relapsing-remitting MS (RRMS) patients and seventeen age- and sex-matched healthy control subjects (CS) took part in the Trier Social Stress Test (TSST), a well validated psycho-social laboratory stress protocol. Repeated blood samples were analyzed for stress-related cortisol and catecholamine levels as well as for glucocorticoid sensitivity (GCS) of target immune cells. Chronic and acute stress appraisals were assessed by self-report measures. RESULTS: RRMS patients and CS did not differ in stress-related cortisol/catecholamine levels, GCS or stress appraisal in response to the TSST. However, cortisol release as well as GCS was strongly correlated with time since diagnosis but not with neurological disability. Patients with shorter disease duration (2-12 months) expressed a significantly higher cortisol stress response while MS patients with longer disease duration (14-36 months) showed a significantly diminished HPA response as well as lower post-stress GCS. DISCUSSION: There is evidence for a time-dependent variability in the HPA stress system with an increased cortisol stress response in the first year after diagnosis along with a more blunted HPA stress response and a diminished GCS in subsequent disease stages. Data underscore the highly dynamic nature of HPA axis regulation in the MS disease process, which could possibly relate to compensatory mechanisms within a cytokine-HPA axis feedback circuit model.
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Citocinas/biosíntesis , Dexametasona/farmacología , Hidrocortisona/farmacología , Sistema Hipotálamo-Hipofisario/fisiopatología , Leucocitos/efectos de los fármacos , Lipopolisacáridos/farmacología , Esclerosis Múltiple Recurrente-Remitente/fisiopatología , Neuroinmunomodulación/fisiología , Sistema Hipófiso-Suprarrenal/fisiopatología , Estrés Psicológico/etiología , Adulto , Estudios de Casos y Controles , Catecolaminas/sangre , Depresión/sangre , Depresión/etiología , Depresión/fisiopatología , Depresión/psicología , Femenino , Humanos , Hidrocortisona/sangre , Concentración 50 Inhibidora , Leucocitos/metabolismo , Masculino , Matemática , Esclerosis Múltiple Recurrente-Remitente/sangre , Esclerosis Múltiple Recurrente-Remitente/psicología , Habla/fisiología , Estrés Psicológico/sangre , Estrés Psicológico/fisiopatología , Adulto JovenRESUMEN
OBJECTIVE: To evaluate the efficacy of an evidence-based patient information programme aiming to increase informed choice in patients with early multiple sclerosis (MS). BACKGROUND: Patients with early MS face a number of uncertainties concerning diagnosis, prognosis and effectiveness of immunotherapy. Prior studies suggest that evidence-based patient information combined with group education can promote informed choice in MS patients. METHODS: A 12-month, six-centre, double-blind randomised controlled clinical trial with 192 patients with a diagnosis of confirmed relapsing-remitting MS or clinical isolated syndrome in Germany. A 4-h interactive evidence-based educational programme was compared with a 4-h MS-specific stress management programme. The primary endpoint was informed choice after 6 months comprising risk knowledge and congruency between attitude towards immunotherapy and actual immunotherapy uptake. Secondary endpoints included autonomy preference, decision autonomy, decisional conflict and satisfaction, anxiety and depression, and number of immunotherapies. RESULTS: For the primary endpoint, a significant difference was shown with 50 of 85 (59%) participants in the intervention group achieving informed choice after 6 months compared with 18 of 89 (20%) in the control group (OR 0.2 (95% CI 0.1 to 0.4), p<0.001). Four weeks after the intervention, more participants in the intervention group showed good risk knowledge (difference between groups 39% (95% CI 26% to 53%), p<0.001). There were no significant differences between groups for attitude towards immunotherapy and for immunotherapy uptake. There were trends towards increased autonomy preference after the intervention and increased adherence to immunotherapies in the intervention group. CONCLUSIONS: The intervention significantly increased informed choice and relevant risk knowledge without negative side effects.
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Práctica Clínica Basada en la Evidencia/métodos , Conocimientos, Actitudes y Práctica en Salud , Esclerosis Múltiple Recurrente-Remitente , Educación del Paciente como Asunto , Adolescente , Adulto , Toma de Decisiones , Método Doble Ciego , Femenino , Humanos , Masculino , Persona de Mediana Edad , Esclerosis Múltiple Recurrente-Remitente/diagnóstico , Esclerosis Múltiple Recurrente-Remitente/psicologíaRESUMEN
BACKGROUND: Multiple sclerosis (MS) is associated with high rates of early retirement (ER). OBJECTIVES: A German cohort of MS patients and healthy control subjects (HCs) were compared cross-sectionally to investigate disease- and non-disease-specific factors that are associated with employment status (ES) in MS and to identify predictors of ES in MS. METHODS: A total of 39 ER MS patients, 48 employed MS patients, and 37 HCs completed a brief neuropsychological battery and questionnaires related to depressive symptoms, fatigue, health-related quality of life (HrQoL) and health locus of control (HLC). Neurological disability was assessed by the Expanded Disability Status Scale (EDSS) and the Multiple Sclerosis Functional Composite (MSFC). RESULTS: ER compared with employed MS patients scored significantly higher in neurological disability, depressive symptoms and fatigue and significantly lower in cognitive functioning and HrQoL. Further, both groups differed with regard to age, education, disease course and duration but not in HLC. Neurological disability, age and fatigue were identified as significant predictors of ES in MS. CONCLUSIONS: ES in MS was associated with demographic aspects, neurological and cognitive status, depressive symptoms, fatigue and HrQoL but was not associated with HLC. Findings confirm neurological disability, age and fatigue as independent predictors of ES in MS.
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Empleo/estadística & datos numéricos , Esclerosis Múltiple/economía , Esclerosis Múltiple/epidemiología , Adulto , Factores de Edad , Cognición/fisiología , Estudios de Cohortes , Estudios Transversales , Depresión/complicaciones , Depresión/psicología , Evaluación de la Discapacidad , Escolaridad , Fatiga/complicaciones , Fatiga/psicología , Femenino , Alemania/epidemiología , Humanos , Control Interno-Externo , Modelos Logísticos , Masculino , Persona de Mediana Edad , Esclerosis Múltiple/psicología , Examen Neurológico , Pruebas Neuropsicológicas , Valor Predictivo de las Pruebas , Psicometría , Calidad de Vida , Factores Sexuales , Factores Socioeconómicos , Encuestas y CuestionariosRESUMEN
OBJECTIVES: Dysregulation of the hypothalamus-pituitary-adrenal (HPA) axis has frequently been reported in multiple sclerosis (MS). So far, HPA axis function in MS has predominantly been studied under pharmacological stimulation which is associated with a series of methodological caveats. Knowledge of circadian cortisol patterns and cortisol awakening response (CAR) is still limited. METHODS: A total of 77 MS patients (55 relapsing-remitting MS (RRMS)/22 secondary-progressive MS (SPMS)) as well as 34 healthy control (HC) subjects were enrolled. Diurnal cortisol release was assessed by repeated salivary cortisol sampling. Neurological disability was rated by the Kurtzke's Expanded Disability Status Scale (EDSS). Depressive symptoms and perceived stress were assessed by self-report measures. RESULTS: RRMS but not SPMS patients differed in circadian cortisol release from HC subjects. Differences in cortisol release were restricted to CAR. Treated and treatment naïve RRMS patients did not differ in CAR. In a RRMS follow-up cohort (nine months follow-up), RRMS patients with EDSS progression (≥0.5) expressed a significantly greater CAR compared to HC subjects. RRMS patients with a stable EDSS did not differ from HC subjects. Neither depressive symptoms nor perceived stress ratings were associated with CAR in RRMS patients. In a step-wise regression analysis, EDSS at baseline and CAR were predictive of EDSS at follow-up (R(2)â=â67%) for RRMS patients. CONCLUSIONS: Circadian cortisol release, in particular CAR, shows a course specific pattern with most pronounced release in RRMS. There is also some evidence for greater CAR in RRMS patients with EDSS progression. As a consequence, CAR might be of predictive value in terms of neurological disability in RRMS patients. The possible role of neuroendocrine-immune interactions in MS pathogenesis is further discussed.
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Hidrocortisona/metabolismo , Esclerosis Múltiple/metabolismo , Adulto , Estudios de Casos y Controles , Relojes Circadianos/fisiología , Femenino , Humanos , Sistema Hipotálamo-Hipofisario/metabolismo , Masculino , Persona de Mediana Edad , Esclerosis Múltiple/fisiopatología , Sistema Hipófiso-Suprarrenal/metabolismo , Saliva/química , Adulto JovenRESUMEN
Many investigators have hypothesized that brain response to cortisol is altered in depression. However, neural activation in response to exogenously manipulated cortisol elevations has not yet been directly examined in depressed humans. Animal research shows that glucocorticoids have robust effects on hippocampal function, and can either enhance or suppress neuroplastic events in the hippocampus depending on a number of factors. We hypothesized that depressed individuals would show 1) altered hippocampal response to exogenous administration of cortisol, and 2) altered effects of cortisol on learning. In a repeated-measures design, 19 unmedicated depressed and 41 healthy individuals completed two fMRI scans. Fifteen mg oral hydrocortisone (i.e., cortisol) or placebo (order randomized and double-blind) was administered 1 h prior to encoding of emotional and neutral words during fMRI scans. Data analysis examined the effects of cortisol administration on 1) brain activation during encoding, and 2) subsequent free recall for words. Cortisol affected subsequent recall performance in depressed but not healthy individuals. We found alterations in hippocampal response to cortisol in depressed women, but not in depressed men (who showed altered response to cortisol in other regions, including subgenual prefrontal cortex). In both depressed men and women, cortisol's effects on hippocampal function were positively correlated with its effects on recall performance assessed days later. Our data provide evidence that in depressed compared to healthy women, cortisol's effects on hippocampal function are altered. Our data also show that in both depressed men and women, cortisol's effects on emotional memory formation and hippocampal function are related.
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Depresión , Hipocampo/efectos de los fármacos , Hidrocortisona/farmacología , Hidrocortisona/uso terapéutico , Trastornos de la Memoria/tratamiento farmacológico , Trastornos de la Memoria/etiología , Adulto , Análisis de Varianza , Depresión/complicaciones , Depresión/tratamiento farmacológico , Depresión/patología , Método Doble Ciego , Emociones/efectos de los fármacos , Femenino , Hipocampo/irrigación sanguínea , Humanos , Hidrocortisona/metabolismo , Procesamiento de Imagen Asistido por Computador/métodos , Imagen por Resonancia Magnética/métodos , Masculino , Recuerdo Mental/efectos de los fármacos , Pruebas Neuropsicológicas , Oxígeno/sangre , Escalas de Valoración Psiquiátrica , Saliva/metabolismo , Estadística como Asunto , Adulto JovenRESUMEN
OBJECTIVES: Electromagnetic field therapy has been reported to be beneficial in patients with multiple sclerosis (MS) with significant fatigue. This study was designed to evaluate the long-term effects of Bio-Electro-Magnetic-Energy-Regulation (BEMER) on MS-related fatigue. DESIGN: This was a monocenter, patient- and rater-blinded, placebo-controlled trial. PATIENTS: There were 37 relapsing-remitting patients with MS with significant fatigue in the study. INTERVENTION: The intervention consisted of BEMER magnetic field treatment for 8 minutes twice daily in comparison to placebo for 12 weeks. OUTCOME MEASURES: The primary outcome criterion was change in the Modified Fatigue Impact Scale (MFIS) between baseline and 12 weeks. The secondary outcome criteria were changes of the Fatigue Severity Scale (FSS), a general depression scale-long version (ADS-L), Multiple Sclerosis Functional Scale (MSFC), and the Expanded Disability Status Scale (EDSS). RESULTS: There was evidence of a significant difference of MFIS value (primary outcome criterion) after 12 weeks in favor of the verum group (26.84 versus 36.67; p = 0.024). In addition, FSS values were significantly lower in the verum group after 12 weeks (3.5 versus 4.7; p = 0.016). After 6 weeks' follow-up, verum and placebo groups did not differ in experienced fatigue (MFIS, FSS). Regarding the subscales of the MFIS, there was a significant decrease in physical (p = 0.018) and cognitive (p = 0.041), but not in psychologic subscales only in the verum group regarding the timepoints baseline and 12 weeks. BEMER therapy was well tolerated. DISCUSSION: In this pilot study, we were able to demonstrate a beneficial effect of BEMER intervention on MS fatigue. As this was only a pilot study, trials with more patients and longer duration are mandatory to describe long-term effects.
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Fatiga/terapia , Magnetoterapia , Esclerosis Múltiple Recurrente-Remitente/terapia , Adulto , Evaluación de la Discapacidad , Método Doble Ciego , Fatiga/etiología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Esclerosis Múltiple Recurrente-Remitente/complicaciones , Índice de Severidad de la EnfermedadRESUMEN
OBJECTIVES: Treatment of multiple sclerosis patients with glatiramer acetate has been demonstrated a beneficial effect on disease activity. The objective of this prospective naturalistic study was to evaluate the impact of glatiramer acetate on fatigue and work absenteeism. METHODS: 291 treatment-naïve patients with relapsing remitting multiple sclerosis were included and treated with glatiramer acetate for twelve months. Relapse rates, disability, fatigue symptoms, days of absence from work and adverse events were monitored. Fatigue was measured with the MFIS scale and with a visual analogue scale. RESULTS: Total MFIS scores decreased by 7.6 +/- 16.4 from 34.6 to 27.0 (p < or = 0.001). Significant reductions were observed on all three subscales of the MFIS. Fatigue symptoms, assessed using a visual analogue scale, decreased by 1.04 +/- 2.88 cm from 4.47 cm to 3.43 cm (p < or = 0.001). The proportion of patients absent from work at least once was reduced by a factor of two from 65.1% to 30.1% (p < or = 0.001). Tolerance to treatment was rated as very good or good in 78.3% of patients. Adverse effects, most frequently local injection site reactions, were reported in 15.1% of patients. CONCLUSION: Treatment with glatiramer acetate was associated with a significant improvement in fatigue symptoms and a marked reduction in absence from work. Treatment was well-tolerated. Such benefits are of relevance to overall patient well-being.
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Absentismo , Fatiga/tratamiento farmacológico , Inmunosupresores/uso terapéutico , Esclerosis Múltiple Recurrente-Remitente/tratamiento farmacológico , Péptidos/uso terapéutico , Adulto , Evaluación de la Discapacidad , Fatiga/clasificación , Fatiga/etiología , Femenino , Alemania , Acetato de Glatiramer , Humanos , Inmunosupresores/efectos adversos , Masculino , Esclerosis Múltiple Recurrente-Remitente/complicaciones , Observación , Péptidos/efectos adversos , Estudios Prospectivos , Perfil de Impacto de Enfermedad , Encuestas y Cuestionarios , Resultado del TratamientoRESUMEN
The prefrontal cortex (PFC) has been well known for its role in higher order cognition, affect regulation and social reasoning. Although the precise underpinnings have not been sufficiently described, increasing evidence also supports a prefrontal involvement in the regulation of the hypothalamus-pituitary-adrenal (HPA) axis. Here we investigate the PFC's role in HPA axis regulation during a psychosocial stress exposure in 14 healthy humans. Regional brain metabolism was assessed using positron emission tomography (PET) and injection of fluoro-18-deoxyglucose (FDG). Depending on the exact location within the PFC, increased glucose metabolic rate was associated with lower or higher salivary cortisol concentration in response to a psychosocial stress condition. Metabolic glucose rate in the rostral medial PFC (mPFC) (Brodman area (BA) 9 and BA 10) was negatively associated with stress-induced salivary cortisol increases. Furthermore, metabolic glucose rate in these regions was inversely coupled with changes in glucose metabolic rate in other areas, known to be involved in HPA axis regulation such as the amygdala/hippocampal region. In contrast, metabolic glucose rate in areas more lateral to the mPFC was positively associated with saliva cortisol. Subjective ratings on task stressfulness, task controllability and self-reported dispositional mood states also showed positive and negative associations with the glucose metabolic rate in prefrontal regions. These findings suggest that in humans, the PFC is activated in response to psychosocial stress and distinct prefrontal metabolic glucose patterns are linked to endocrine stress measures as well as subjective ratings on task stressfulness, controllability as well as dispositional mood states.
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Glucemia/metabolismo , Mapeo Encefálico , Hidrocortisona/metabolismo , Corteza Prefrontal/metabolismo , Estrés Psicológico/metabolismo , Adaptación Fisiológica , Adaptación Psicológica/fisiología , Adolescente , Adulto , Amígdala del Cerebelo/metabolismo , Humanos , Sistema Hipotálamo-Hipofisario/metabolismo , Imagen por Resonancia Magnética , Masculino , Sistema Hipófiso-Suprarrenal/metabolismo , Tomografía de Emisión de Positrones , Valores de Referencia , Saliva/metabolismoRESUMEN
Psychoneuroimmunology is a relatively new field of study that investigates interactions between behaviour and the immune system, mediated by the endocrine and nervous systems. The immune and central nervous system (CNS) maintain extensive communication. On the one hand, the brain modulates the immune system by hardwiring sympathetic and parasympathetic nerves (autonomic nervous system) to lymphoid organs. On the other hand, neuroendocrine hormones such as corticotrophin-releasing hormone or substance P regulate cytokine balance. Vice versa, the immune system modulates brain activity including sleep and body temperature. Based on a close functional and anatomical link, the immune and nervous systems act in a highly reciprocal manner. From fever to stress, the influence of one system on the other has evolved in an intricate manner to help sense danger and to mount an appropriate adaptive response. Over recent decades, reasonable evidence has emerged that these brain-to-immune interactions are highly modulated by psychological factors which influence immunity and immune system-mediated disease.
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Sistema Inmunológico/fisiología , Fenómenos Fisiológicos del Sistema Nervioso , Psiconeuroinmunología/tendencias , Terapia Conductista , Historia del Siglo XX , Humanos , Inflamación , Dolor , Psiconeuroinmunología/historia , Estrés PsicológicoRESUMEN
BACKGROUND: There is substantial evidence that the hippocampus (HC) regulates the activity of the hypothalamic-pituitary-adrenocortical (HPA) axis. Damage to the HC in animals produces a transient alteration in diurnal and stress-related HPA activity. This study was designed to examine the effects of HC damage on basal cortisol secretion in humans. METHODS: Salivary cortisol was measured in 22 patients with HC damage (12 with bilateral damage and 10 with unilateral damage), 7 brain-damaged comparison participants, 10 healthy, age-matched comparison participants, and 6 of the patients' caregivers. Salivary cortisol samples were taken immediately after awakening, 30 min after awakening, at 8:00 am, 11:00 am, 3:00 pm, 6:00 pm, and at bedtime on a single day. Brain-injured patients underwent a structural magnetic resonance imaging scan to examine quantitative volumes of the HC. RESULTS: Both bilateral and unilateral HC damage abolished the cortisol response to awakening documented in the comparison groups. Caregivers of bilateral HC patients showed a reduced response to awakening. The remainder of the circadian pattern was not affected in the HC patients; all groups showed a significant diurnal variation. There was no association between HC volume and cortisol secretion. CONCLUSIONS: Hippocampal damage in humans abolishes the cortisol response to awakening, whereas the remainder of the diurnal cycle is unaffected in these patients. These data suggest a unique role of the HC in the control of basal cortisol secretion.