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1.
HNO ; 67(1): 36-44, 2019 Jan.
Article in German | MEDLINE | ID: mdl-30324556

ABSTRACT

BACKGROUND: Hearing-impairment can lead to a reduced quality of life and thus represents a vulnerability factor for mental disorders. OBJECTIVE: This study represents the first psychiatric analysis of subjective quality of life and depression in people with hearing-impairment in Germany. MATERIALS AND METHODS: The patient group included 30 hearing-impaired participants (27 women, 3 men) with a current or previous mental disorder and/or psychiatric/psychotherapeutic treatment (age: mean, M = 49.67 years; standard deviation, SD = 13.54 years). The control group consisted of 22 hearing-impaired participants (16 women, 6 men) without mental disorders or treatment (age: M = 52.41 years, SD = 17.30 years). Besides sociodemographic variables, we registered onset/extent of the various hearing-impairments and hearing aid provision. Both groups underwent extensive diagnostic assessment comprising subjective functional impairment (Sheehan Disability Scale, SDS), health-related quality of life (SF-36 Health Survey), and depressive symptoms (Beck Depression Inventory, BDI-II). RESULTS: Groups did not differ significantly in terms of sociodemographic variables such as age, gender, or intelligence. Participants of the patient group had a significantly greater subjective impairment, a lower quality of life, and more pronounced symptoms of depression. The invasiveness of the hearing aid (i. e., cochlear implant) as well as the timepoint of hearing-impairment onset (postlingually) appear to serve as vulnerability factors for mental health problems in this group. CONCLUSION: Our results indicate that besides delivering high-quality acoustic care, practitioners should continuously check patients' requirements for psychosocial treatment due to a loss of quality of life. The development of a specific psychotherapeutic treatment for hearing-impaired clients requires additional research focused on protective and vulnerability factors which may influence the emergence of mental disorders in these patients.


Subject(s)
Depression , Persons With Hearing Impairments/psychology , Quality of Life , Depression/epidemiology , Female , Germany , Hearing Aids , Humans , Male , Middle Aged , Surveys and Questionnaires
2.
Clin Radiol ; 72(12): 1038-1046, 2017 Dec.
Article in English | MEDLINE | ID: mdl-28851490

ABSTRACT

AIM: To investigate the technical success rate and procedure-related complications of computed tomography (CT)-guided needle biopsy of lung lesions and to identify the factors that are correlated with the occurrence of procedure-related complications. MATERIALS AND METHODS: This was a single- institution retrospective study of 867 consecutive CT-guided needle biopsies of lung lesions performed on 772 patients in a tertiary cancer centre. The technical success rate and complications were correlated with patient, lung lesion, and procedure-related variables. RESULTS: The technical success rate was 87.2% and the mortality rate was 0.12%. Of the 867 total biopsies 25.7% were associated with pneumothorax, and 6.5% required chest tube drainage. The haemothorax rate was 1.8%. There was positive correlation between the development of pneumothorax and smaller lesion diameter (p<0.001), longer transparenchymal distance (p<0.001), and prone position (p=0.027). There was positive correlation between the need for chest tube placement and longer transparenchymal distance (p=0.007) and smaller lesion diameter (p=0.018). Lesions in the left lower lobe had the lowest rates of pneumothorax (p=0.008) and chest tube drainage (p=0.018). Patients whose pneumothoraces were diagnosed on the follow-up chest X-ray, but not on the immediate post-procedural CT scan had significantly higher requirement for chest tube drainage (p=0.039). CONCLUSION: CT-guided lung biopsy has a high rate of technical success and a low rate of major complications. The present study has revealed several variables that can be used to identify high-risk procedures. A post-procedural chest X-ray within hours after the procedure is highly recommended to identify high-risk patients who require chest tube placement.


Subject(s)
Biopsy, Needle , Lung/pathology , Adult , Aged , Aged, 80 and over , Biopsy, Needle/adverse effects , Biopsy, Needle/methods , Chest Tubes/statistics & numerical data , Female , Humans , Male , Middle Aged , Pneumothorax/etiology , Radiology, Interventional/methods , Retrospective Studies , Young Adult
3.
Acta Psychiatr Scand ; 135(6): 506-514, 2017 06.
Article in English | MEDLINE | ID: mdl-28276052

ABSTRACT

OBJECTIVE: Attention deficit hyperactivity disorder (ADHD) is associated with social conflicts. The purpose of this study was to explore domains of social cognition in adult patients with ADHD. METHODS: The assessment of social cognition was based on established neuropsychological tests: the Tübinger Affect Battery (TAB) for prosody and the Cambridge Behaviour Scale (CBS) for empathy. The performance of adults with ADHD (N = 28) was compared with the performance of a control group (N = 29) matched according to basic demographic variables. RESULTS: Treatment-naïve adults with ADHD showed deficits in emotional prosody (P = 0.02) and in the ability to empathize (P < 0.02) independent of executive functioning. In particular, their ability to perceive angry feelings was found to be compromised (P = 0.04). When emotional prosody was considered in relation to facial expressions, patients and controls showed no impairments (P > 0.2). No gender differences concerning social cognitive skills were detected. CONCLUSIONS: ADHD is associated with social cognition impairments involving both emotional prosody and empathy.


Subject(s)
Attention Deficit Disorder with Hyperactivity/psychology , Emotional Intelligence , Adult , Case-Control Studies , Empathy , Executive Function , Facial Expression , Female , Humans , Male , Middle Aged , Neuropsychological Tests , Social Perception , Young Adult
4.
Nervenarzt ; 87(1): 74-81, 2016 Jan.
Article in German | MEDLINE | ID: mdl-26105163

ABSTRACT

Unemployment is related to a higher risk for psychological distress and mental disorders, which cause individual suffering and socioeconomic costs for society in general. This selective review surveys the relationship between unemployment and psychological well-being and mental disorders. The most important programs for the improvement of the mental health of the unemployed are summarized: 1. Interventions for the unemployed with the aim of improving coping strategies reduce the risk of developing depressive symptoms. 2. The SUPPORT liaison outpatient unit collaborates closely with the unemployment agency and offers a low-threshold screening for mental disorders for unemployed subjects as well as counseling for those in need of treatment. 3. A group training based on cognitive behavioral therapy improves the psychological well-being of unemployed participants. 4. Supported employment is an effective means of placing severely mentally ill patients in a work-place accompanied by an extensive professional support.


Subject(s)
Ambulatory Care/methods , Cognitive Behavioral Therapy/methods , Mental Disorders/psychology , Mental Disorders/therapy , Psychotherapy, Group/methods , Unemployment/psychology , Combined Modality Therapy/methods , Germany , Humans , Mental Disorders/diagnosis
6.
Eur Psychiatry ; 29(4): 239-45, 2014 May.
Article in English | MEDLINE | ID: mdl-23845531

ABSTRACT

OBJECTIVES: Increased levels of anxiety, depression and alcohol abuse are associated with unemployment. This study compares both DSM-IV-TR Axis-I and Axis-II mental disorders between a representative and a referred sample of unemployed youths aged 16.0 to 24.9. METHODS: One hundred subjects were randomly recruited on the premises of the vocational services centre in the urban region of Essen, Germany (representative sample, RS). One hundred and sixty-five subjects constituting the 'clinical sample' (CS) were preselected and referred by case managers to the on-site psychiatric liaison service. Structured Clinical Interviews for DSM-IV (SCID-I and -II), measures of psychopathology and health service utilization were administered. RESULTS: Ninety-eight percent and 43% of CS and RS subjects fulfilled DSM-IV criteria for mental disorders. Mood-, anxiety- and substance-related disorders were the most common Axis-I disorders in both samples. Personality disorders were diagnosed significantly more frequently in the CS. Despite the more severe psychopathology in subjects with mental disorders from the CS compared to the RS, no differences were found for recent mental health service utilisation. CONCLUSION: Because the sample of unemployed youths referred by case managers was significantly more disturbed in psychiatric terms, such a pre-selection is deemed useful in conjunction with a psychiatric liaison service on the premise of a job centre.


Subject(s)
Mental Disorders/epidemiology , Unemployment/psychology , Adolescent , Anxiety Disorders/epidemiology , Female , Germany/epidemiology , Humans , Interview, Psychological , Male , Mental Health Services/statistics & numerical data , Mood Disorders/epidemiology , Personality Disorders/epidemiology , Prevalence , Substance-Related Disorders/epidemiology , Unemployment/statistics & numerical data , Young Adult
7.
Acta Psychiatr Scand ; 128(2): 142-8, 2013 Aug.
Article in English | MEDLINE | ID: mdl-23581825

ABSTRACT

OBJECTIVE: Adults with attention deficit hyperactivity disorder (ADHD) have difficulties processing affective prosody, and research evidence demonstrates the importance of brain serotonin (5-HT) in the neurobiology of ADHD. This study aimed to investigate whether diminished brain 5-HT synthesis, as achieved by acute tryptophan depletion (ATD), can impair the processing of affective prosody in adults with ADHD. METHOD: Twenty male patients with ADHD and twenty male healthy controls received ATD and a tryptophan-balanced control condition on separate days in a double-blind within-subject repeated measures crossover design. In both conditions, the Tübingen Affect Battery was administered in which subjects had to name the affective prosody of sentences with neutral, congruent, or incongruent semantic content. RESULTS: Participants in the group of patients with ADHD perceived affective prosody less accurately than controls. Participants with ADHD showed compromised processing of sentences, committing more errors than healthy controls when identifying affect in instances of incongruent semantic content (P = 0.031). ATD did not contribute to this effect (all P > 0.5). CONCLUSION: The difficulties male adults with ADHD have in accurately processing affective prosody may result from impairments in their ability to inhibit unwanted stimuli and impulses. No clear evidence implicates 5-HT as a cause of these impairments.


Subject(s)
Affect , Attention Deficit Disorder with Hyperactivity , Diet Therapy/methods , Serotonin/biosynthesis , Tryptophan , Adult , Affect/drug effects , Affect/physiology , Attention Deficit Disorder with Hyperactivity/diagnosis , Attention Deficit Disorder with Hyperactivity/metabolism , Attention Deficit Disorder with Hyperactivity/psychology , Attention Deficit Disorder with Hyperactivity/therapy , Central Nervous System/metabolism , Cross-Over Studies , Double-Blind Method , Humans , Male , Psychological Techniques , Psychotropic Drugs/metabolism , Psychotropic Drugs/pharmacology , Reaction Time/drug effects , Sex Factors , Synaptic Transmission/drug effects , Synaptic Transmission/physiology , Treatment Outcome , Tryptophan/metabolism , Tryptophan/pharmacology
8.
Acta Psychiatr Scand ; 128(2): 124-32, 2013 Aug.
Article in English | MEDLINE | ID: mdl-23419004

ABSTRACT

OBJECTIVE: To date, the impact of the neurotransmitter serotonin (5-HT) on different neuropsychological functions in adults with attention deficit hyperactivity disorder (ADHD) is underinvestigated. We aimed to examine the effects of acute tryptophan depletion (ATD) and the resulting reduction in central nervous 5-HT synthesis on target/non-target discrimination ability and sustained attention in adults with ADHD using an AX-Continuous Performance Test (AX-CPT). METHOD: Twenty male patients with ADHD (age: M = 30.25 SD = 9.37) and twenty male healthy controls (age: M = 27.90 SD = 6.01) received ATD on one day and a tryptophan-balanced control condition (BAL) on another day in a double-blind within-subject crossover design. A continuous performance test (AX-CPT) with three conditions (AX, AY, and BX) was administered on both days under depleted and sham-depleted conditions. RESULTS: In patients omissions increased after ATD when compared with BAL. Patient's reaction time decreased after ATD when compared with BAL, which was contrasted by opposite effects in controls. Patients showed fewer correct responses (AX condition) and showed a higher rate of errors (condition AXE ) independent of ATD or BAL intake. CONCLUSION: The present preliminary results are indicative of the contribution of serotonergic neurotransmission to attentional processes in adults with ADHD.


Subject(s)
Attention Deficit Disorder with Hyperactivity , Attention/drug effects , Diet Therapy/methods , Serotonin/biosynthesis , Tryptophan , Adult , Attention Deficit Disorder with Hyperactivity/diagnosis , Attention Deficit Disorder with Hyperactivity/metabolism , Attention Deficit Disorder with Hyperactivity/psychology , Attention Deficit Disorder with Hyperactivity/therapy , Central Nervous System/metabolism , Cross-Over Studies , Double-Blind Method , Humans , Male , Psychological Techniques , Psychotropic Drugs/metabolism , Psychotropic Drugs/pharmacology , Reaction Time/drug effects , Sex Factors , Synaptic Transmission/drug effects , Synaptic Transmission/physiology , Treatment Outcome , Tryptophan/metabolism , Tryptophan/pharmacology
9.
Gesundheitswesen ; 75(8-9): e113-8, 2013 Aug.
Article in German | MEDLINE | ID: mdl-23299576

ABSTRACT

OBJECTIVES: The aim of this study is to implement and examine the feasibility of a cross-institutional mental health intervention to comprehend and advance mental health of elderly long-term unemployed persons. METHODS: Report on the procedure and on the observational study utilisation in a 14-month period. RESULTS: The structure and processes chosen could be implemented into practice successfully. Utilisation was high but 30% dropped out during the procedure. Of the unemployed persons surveyed, 96% received a psychiatric diagnosis. 85% were not having psychiatric treatment. CONCLUSION: The method chosen is feasible and was accepted by the target group. Project structure and processes proved to be applicable for the implementation of the project aims. The method chosen reaches an up to now "psychiatry-inexperienced" target group characterised by frequent incidence of mental disorders and low utilisation of psychiatric care. Thus, vocational reintegration programmes should be supported by psychiatric services.


Subject(s)
Mental Disorders/epidemiology , Mental Disorders/rehabilitation , Psychotherapy/statistics & numerical data , Rehabilitation, Vocational/methods , Rehabilitation, Vocational/statistics & numerical data , Unemployment/statistics & numerical data , Aged , Female , Germany/epidemiology , Humans , Male , Mental Disorders/diagnosis , Middle Aged , Pilot Projects , Prevalence , Program Evaluation , Risk Factors , Treatment Outcome
10.
Eur Psychiatry ; 27(5): 321-8, 2012 Jul.
Article in English | MEDLINE | ID: mdl-21392946

ABSTRACT

BACKGROUND: The German version of the Conners Adult ADHD Rating Scales (CAARS) has proven to show very high model fit in confirmative factor analyses with the established factors inattention/memory problems, hyperactivity/restlessness, impulsivity/emotional lability, and problems with self-concept in both large healthy control and ADHD patient samples. This study now presents data on the psychometric properties of the German CAARS-self-report (CAARS-S) and observer-report (CAARS-O) questionnaires. METHODS: CAARS-S/O and questions on sociodemographic variables were filled out by 466 patients with ADHD, 847 healthy control subjects that already participated in two prior studies, and a total of 896 observer data sets were available. Cronbach's-alpha was calculated to obtain internal reliability coefficients. Pearson correlations were performed to assess test-retest reliability, and concurrent, criterion, and discriminant validity. Receiver Operating Characteristics (ROC-analyses) were used to establish sensitivity and specificity for all subscales. RESULTS: Coefficient alphas ranged from .74 to .95, and test-retest reliability from .85 to .92 for the CAARS-S, and from .65 to .85 for the CAARS-O. All CAARS subscales, except problems with self-concept correlated significantly with the Barrett Impulsiveness Scale (BIS), but not with the Wender Utah Rating Scale (WURS). Criterion validity was established with ADHD subtype and diagnosis based on DSM-IV criteria. Sensitivity and specificity were high for all four subscales. CONCLUSION: The reported results confirm our previous study and show that the German CAARS-S/O do indeed represent a reliable and cross-culturally valid measure of current ADHD symptoms in adults.


Subject(s)
Attention Deficit Disorder with Hyperactivity/diagnosis , Psychiatric Status Rating Scales , Adult , Attention Deficit Disorder with Hyperactivity/psychology , Cross-Sectional Studies , Diagnostic Self Evaluation , Factor Analysis, Statistical , Female , Humans , Male , Middle Aged , Psychometrics , Reproducibility of Results , Sensitivity and Specificity
11.
Br J Radiol ; 85(1010): 187-92, 2012 Feb.
Article in English | MEDLINE | ID: mdl-22128126

ABSTRACT

Desmoplastic small round cell tumour (DSRCT) belongs to the histological descriptive category of small round blue cell tumours. DSRCT primarily occurs in adolescents and young adults between the ages of 15 and 25 years and has a male predominance. DSRCT is an aggressive disease with a poor prognosis; timely diagnosis is therefore critical to the management of these patients. Although their radiographic appearances overlap with other aggressive malignancies, there are certain imaging features that can suggest the diagnosis and expedite the initiation of appropriate therapy. The aim of our pictorial review is to describe the imaging findings of primary and metastatic DSRCT in adults.


Subject(s)
Desmoplastic Small Round Cell Tumor/diagnosis , Adult , Contrast Media , Diagnosis, Differential , Female , Fluorodeoxyglucose F18 , Humans , Magnetic Resonance Imaging/methods , Male , Multimodal Imaging/methods , Positron-Emission Tomography , Radiopharmaceuticals , Tomography, X-Ray Computed/methods
13.
Eur Psychiatry ; 26(2): 100-7, 2011 Mar.
Article in English | MEDLINE | ID: mdl-20619613

ABSTRACT

BACKGROUND: Attention-deficit/hyperactivity disorder (ADHD) often persists into adulthood. Instruments for diagnosing ADHD in childhood are well validated and reliable, but diagnosis of ADHD in adults remains problematic. Attempts have been made to develop criteria specific for adult ADHD, resulting in the development of self-report and observer-rated questionnaires. To date, the Conners Adult ADHD Rating Scales (CAARS) are the international standard for questionnaire assessment of ADHD. The current study evaluates a German version of the CAARS self-report (CAARS-S). METHODS: Eight hundred and fifty healthy German control subjects were recruited to fill out the CAARS-S and to answer questions on sociodemographic variables. Explorative and confirmative factor analyses were conducted to obtain the factor structure for the German model and to replicate the factor structure of the original American model. Analyses on gender, age, and education level were calculated for normative data. RESULTS: The explorative factor analysis of the German sample results in a six-factor solution that explained 52% of the variance. A confirmative analysis that was based on the 42 items of the original American model showed a high model-fit. Analyses of normative data showed significant influences of age, gender, and education level on the emerging subscales. CONCLUSION: Even though the explorative factor analysis yields a solution different from the American original, the confirmative factor analysis results in such a high model-fit that use of the American version is justified with respect to international multicenter studies, for which this instrument will be highly valuable.


Subject(s)
Attention Deficit Disorder with Hyperactivity/classification , Attention Deficit Disorder with Hyperactivity/diagnosis , Mass Screening/standards , Personality Inventory/statistics & numerical data , Personality Inventory/standards , Self Report/standards , Adult , Age of Onset , Factor Analysis, Statistical , Female , Germany , Humans , Male , Middle Aged , Psychiatric Status Rating Scales/standards , ROC Curve , Sensitivity and Specificity , Severity of Illness Index , Translating , Young Adult
14.
Neurosci Biobehav Rev ; 34(5): 734-43, 2010 Apr.
Article in English | MEDLINE | ID: mdl-19857516

ABSTRACT

UNLABELLED: Attention-deficit hyperactivity disorder (ADHD) is associated with a range of cognitive deficits and social cognition impairments, which might be interpreted in the context of fronto-striatal dysfunction. So far only few studies have addressed the issue of social cognition deficits in ADHD. METHOD: Medline and Psyclit searches were performed for a 30-year period (1979-2009) using the words 'ADHD' and 'social cognition', 'theory of mind', 'prosody', 'face perception', 'humour' or 'social information processing'. Inclusion criteria consisted of a diagnosis according to DSM as well as the inclusion of a control group or a follow-up assessment following the treatment with methylphenidate. RESULTS: ADHD is clearly associated with social cognition impairments involving emotional face and prosody perception. Although the database is sparse so far, there is some evidence for theory of mind deficits and reduced empathy in ADHD. CONCLUSIONS: In summary, the social cognition impairments are consistent with fronto-striatal dysfunction in ADHD, but other functional networks of brain areas also appear to be implicated.


Subject(s)
Attention Deficit Disorder with Hyperactivity/physiopathology , Cognition/physiology , Social Perception , Animals , Attention Deficit Disorder with Hyperactivity/psychology , Brain/growth & development , Brain/physiopathology , Humans
15.
Cerebrovasc Dis ; 24(4): 343-8, 2007.
Article in English | MEDLINE | ID: mdl-17690546

ABSTRACT

BACKGROUND: Spontaneous cervical artery dissection (sCAD) is a common cause of stroke in patients below 55 years. Dermal connective tissue abnormalities have been observed in up to 60% of patients. A chromosomal locus for connective tissue abnormalities associated with sCAD has been mapped to chromosome 15q24 to a candidate region containing the lysyl oxidase-like 1 gene (LOXL1). LOXL1 an excellent candidate susceptibility gene for non-familial sCAD was investigated by mutation analysis and a genetic association study. METHODS: We sequenced the whole coding region of the LOXL1 gene in 15 sCAD patients and performed a genetic association study in 157 sCAD patients using 12 single nucleotide polymorphisms (SNP). RESULTS: The SNP rs3825942 (Gly153Asp) showed marginal association with sCAD on an allele basis and in the dominant genetic model, and intronic SNP rs893817 under a recessive model only. None of the SNP haplotypes was associated with sCAD. CONCLUSIONS: Genetic variation in LOXL1 might play a role as a risk factor for sCAD.


Subject(s)
Amino Acid Oxidoreductases/genetics , Aortic Dissection/genetics , Cervical Vertebrae/blood supply , Polymorphism, Single Nucleotide , Adult , Aortic Dissection/enzymology , DNA Mutational Analysis , Exons , Female , Gene Frequency , Genetic Predisposition to Disease , Humans , Introns , Linkage Disequilibrium , Male , Middle Aged , Models, Genetic , Odds Ratio , Retrospective Studies , Risk Assessment , Risk Factors
16.
AJNR Am J Neuroradiol ; 28(2): 371-7, 2007 Feb.
Article in English | MEDLINE | ID: mdl-17297015

ABSTRACT

BACKGROUND AND PURPOSE: We report our experiences in the treatment of intracranial arteriovenous malformations (AVMs) with Onyx embolization before neuro- or radiosurgery, focusing on the embolization technique with Onyx. METHODS: Ninety-three patients (40 women and 53 men, mean age 38 years) with 94 intracranial AVMs with a mean volume of 9.2 mL were embolized with Onyx. The following features of all AVMs were evaluated before the treatment: type of nidus and shunt, draining veins, and feeding arteries. RESULTS: Complete obliteration rates were 20% at the end of all embolization steps and 53% after embolization and surgery. In 21% of patients the final control angiography is not yet available (after surgery 9%, after radiosurgery 12%). In 4% of patients, radiosurgery was planned due to a persistent arteriovenous shunt. The injection of Onyx resulted in high occlusion rates (volume reduction >90%) when the AVM was in a supratentorial and cortical location, the nidus was compact and plexiform, and when there was a small number of supplying (direct) feeders and one superficial draining vein. Access device-related complications (stuck catheter, vessel perforation) occurred during the embolization of 220 feeding arteries in 6% of patients, with all such instances having had no clinical consequences. CONCLUSION: With knowledge of the morphologic characteristics of AVMs that are suitable for a treatment with Onyx, high occlusion rates and low complication rates in treating a small number of feeders are feasible. Superselective intranidal or perinidal catheter positions and slow, controlled injections that protect the draining veins make the therapy safe even in complex AVMs and critical locations.


Subject(s)
Dimethyl Sulfoxide/therapeutic use , Embolization, Therapeutic/methods , Intracranial Arteriovenous Malformations/therapy , Polyvinyls/therapeutic use , Adolescent , Adult , Aged , Cerebral Angiography , Child , Female , Humans , Intracranial Arteriovenous Malformations/diagnostic imaging , Male , Middle Aged , Treatment Outcome
17.
Inflamm Res ; 55(7): 274-8, 2006 Jul.
Article in English | MEDLINE | ID: mdl-16955389

ABSTRACT

OBJECTIVES: To clone and sequence cyclooxygenase-1b (COX-1b, also known as COX-3) mRNA and to generate an antibody against the mouse COX-1b protein and to demonstrate its existence in vivo in mouse tissues. ANIMALS: 10 C57BL/6 mice, 4 COX-1 knockout mice and 4 COX-1 wild type mice were used. METHODS: COX-1b mRNA sequence was determined by RT-PCR amplification using specific primers followed by DNA sequencing. COX-1b protein expression was determined by Western blotting. RESULTS: The mouse COX-1b mRNA is a splice variant of the COX-1 mRNA generated by the retention of intron-1. COX-1b mRNA encodes a 127 amino acid protein with no similarity with known COX sequences. We generated an anti-mouse COX-1b antibody and demonstrated the existence of COX-1b protein in vivo with the highest expression in kidney, heart, and neuronal tissues. We also detected COX-1b mRNA and protein expression in COX-1 knockout mice. CONCLUSIONS: In mouse, COX-1b encodes a protein with a completely different amino acid sequence than COX-1 or COX-2; therefore it is improbable that COX-1b in this species plays a role in prostaglandin-mediated fever and pain. In addition, the COX-1(-/-) mouse is not a COX-1b(-/-) mouse, therefore it cannot be used to elucidate the function of the COX-1b protein.


Subject(s)
Prostaglandin-Endoperoxide Synthases/genetics , Alternative Splicing , Amino Acid Sequence , Animals , Base Sequence , Cloning, Molecular , Gene Expression Regulation, Enzymologic , Male , Mice , Mice, Inbred C57BL , Mice, Knockout , Molecular Sequence Data , Prostaglandin-Endoperoxide Synthases/biosynthesis , RNA, Messenger/metabolism , Sequence Analysis, DNA , Tissue Distribution
18.
Neuroscience ; 140(2): 723-30, 2006 Jun 30.
Article in English | MEDLINE | ID: mdl-16567054

ABSTRACT

We examined the role of cyclooxygenase-2 in the development of ischemic tolerance induced by cortical spreading depression against transient, focal brain ischemia. Cortical spreading depression was continuously induced for 2 h with topical KCl (13+/-1 depolarizations/2 h) in male Wistar rats. At 1, 2, 3, 4, and 5 days following recovery, the middle cerebral artery was transiently occluded for 120 min. Four days later, the animals were killed and infarct volume was determined. Additionally, cyclooxygenase-2 levels in the cerebral cortex and 15 deoxy-Delta(12, 14) PGJ2 levels in cerebrospinal fluid were determined at these times with Western blotting and immunoassay, respectively. Infarct volume was reduced compared with non-cortical spreading depression control animals (274.3+/-15.3 mm3) when cortical spreading depression was performed 3 and 4 days before middle cerebral artery occlusion (163.9+/-14.2 mm3, 154.9+/-14.2 mm3) but not at 1, 2 and 5 days (280.4+/-17.3 mm3, 276.3+/-16.9 mm3 and 268.5+/-17.3 mm3). Cyclooxygenase-2 levels increased most dramatically starting at 2 days, peaked at 3 days, and started to return toward baseline at 4 days after cortical spreading depression. 15 Deoxy-Delta(12, 14) PGJ2 levels increased from 134.7+/-83 pg/ml at baseline to 718+/-98 pg/ml at 3 days. Administration of N-[2-cyclohexyloxy-4-nitrophenyl] methanesulphonamide (10 mg/kg, i.v.), a selective cyclooxygenase-2 inhibitor, at 1 h prior to middle cerebral artery occlusion in cortical spreading depression preconditioned animals did not affect infarct volume (162.6+/-62.1 mm3). However, administration of N-[2-cyclohexyloxy-4-nitrophenyl] methanesulphonamide given three times prior to middle cerebral artery occlusion prevented the reduced infarct volume induced by cortical spreading depression preconditioning (272.9+/-63.2 mm3). Administration of L-nitro-arginine methyl ester (4 mg/kg, i.v.) prior to cortical spreading depression blocked increases in cyclooxygenase-2 normally seen at 3 and 4 days. We conclude that NO-mediated cyclooxygenase-2 upregulation by cortical spreading depression protects the brain against ischemic damage.


Subject(s)
Cerebral Cortex/enzymology , Cortical Spreading Depression/physiology , Cyclooxygenase 2/metabolism , Ischemic Attack, Transient/enzymology , Ischemic Preconditioning/methods , Nitric Oxide/metabolism , Animals , Cerebral Cortex/physiopathology , Cerebral Infarction/drug therapy , Cerebral Infarction/enzymology , Cerebral Infarction/physiopathology , Cyclooxygenase 2 Inhibitors/pharmacology , Cytoprotection/drug effects , Cytoprotection/physiology , Disease Models, Animal , Infarction, Middle Cerebral Artery/enzymology , Infarction, Middle Cerebral Artery/physiopathology , Ischemic Attack, Transient/physiopathology , Male , NG-Nitroarginine Methyl Ester/pharmacology , Nitric Oxide Synthase/antagonists & inhibitors , Nitric Oxide Synthase/metabolism , Potassium Chloride/pharmacology , Prostaglandin D2/analogs & derivatives , Prostaglandin D2/metabolism , Rats , Rats, Wistar , Up-Regulation/drug effects , Up-Regulation/physiology
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