ABSTRACT
Objective:To analyze clinical and immunoserological features of patients with anti-p200 pemphigoid.Methods:Clinical data were collected from patients with confirmed anti-p200 pemphigoid in Hospital of Dermatology, Chinese Academy of Medical Sciences from January 2015 to October 2021, and their clinical and immunoserological characteristics were retrospectively analyzed.Results:Seven patients with anti-p200 pemphigoid were included. Indirect immunofluorescence on salt-split skin (IIF-SSS) showed that serum IgG antibodies of the 7 patients were located in the dermis of the salt-split skin, and Western blot analysis with dermal extracts as substrates revealed a protein band with a relative molecular mass of 200 000. Four patients presented with classic bullous pemphigoid-like skin lesions, 2 initially presented with eczematous lesions, and 1 presented with linear IgA bullous dermatosis-like skin lesions. Circulating IgG antibodies could recognize the recombinant laminin γ1 C-terminal region in 6 cases. Four patients received different doses of systemic glucocorticoids, 1 of whom was resistant to high-dose systemic glucocorticoids (equivalent to 1.4 mg·kg -1·d -1 prednisone) ; 2 responded well to minocycline and dapsone; 1 was lost to follow-up. Four patients achieved complete remission and discontinued the treatment at a mean follow-up of 22.5 months; 2 received complete remissiona on minimal therapy at a mean follow-up of 8 months. Conclusion:Patients with anti-p200 pemphigoid presented with heterogeneous clinical manifestations, and the recombinant C-terminal fragment of laminin γ1 can serve as a reliable antigen substrate for the detection of autoantibodies in patients with anti-p200 pemphigoid; some patients can eventually achieve complete remission off treatment.
ABSTRACT
We examined the neural correlates of the statistical learning of orthographic-semantic connections in Chinese adult learners. Visual event-related potentials (ERPs) were recorded while participants were exposed to a sequence of artificial logographic characters containing semantic radicals carrying low, moderate, or high levels of semantic consistency. The behavioral results showed that the mean accuracy of participants' recognition of previously exposed characters was 63.1% that was significantly above chance level (50%), indicating the statistical learning of the regularities of semantic radicals. The ERP data revealed a temporal sequence of the neural process of statistical learning of orthographic-semantic connections, and different brain indexes were found to be associated with this processing, i.e., a clear N170-P200-N400 pattern. For N170, the larger negative amplitudes were evoked by the high and moderate consistency than the low consistency. For P200, the mean amplitudes elicited by the moderate and low consistency were larger than the high consistency. In contrast, a larger N400 amplitude was observed in the low than moderate and high consistency; and more negative amplitude was elicited by the moderate than high consistency. We propose that the initial potential shifts (N170 and P200) may reflect orthographic or graphic form identification, while the later component (N400) may be associated with semantic information analysis.
ABSTRACT
Many event-related potentials (ERPs) studies have been performed in major depressive disorder. ERPs include P50, N170, loudness dependence of auditory evoked potentials (LDAEP), P300, and mismatch negativity (MMN). These ERPs have good time-resolution as noninvasive methods, so they can be used easily in clinical practice and research. For example, ERPs can be used to differentiate patients from healthy people, as well as for assessing the subtype and severity, investigating the psychopathology, and predicting the treatment response in mental disorders. This review focuses on P50, N170, LDAEP, P300, and MMN in major depressive disorders.
Subject(s)
Humans , Depressive Disorder, Major , Evoked Potentials , Evoked Potentials, Auditory , Mental Disorders , PsychopathologyABSTRACT
Affective states influence subsequent attention allocation. We evaluated emotional negativity bias modulation by reappraisal in patients with generalized anxiety disorder (GAD) relative to normal controls. Event-related potential (ERP) recordings were obtained, and changes in P200 and P300 amplitudes in response to negative or neutral words were noted after decreasing negative emotion or establishing a neutral condition. We found that in GAD patients only, the mean P200 amplitude after negative word presentation was much higher than after the presentation of neutral words. In normal controls, after downregulation of negative emotion, the mean P300 amplitude in response to negative words was much lower than after neutral words, and this was significant in both the left and right regions. In GAD patients, the negative bias remained prominent and was not affected by reappraisal at the early stage. Reappraisal was observed to have a lateralized effect at the late stage.
Subject(s)
Adult , Female , Humans , Male , Anxiety Disorders/pathology , Attention/physiology , Emotions/physiology , Evoked Potentials/physiology , Behavior Control/methods , Case-Control Studies , Down-Regulation , Manifest Anxiety Scale , Photic Stimulation , Reaction Time/physiologyABSTRACT
OBJECTIVES: The purpose of this study was to examine the automatic attentional bias to disease/body-related stimuli in individuals exhibiting somatization tendencies using Event-Related Potential (ERP). METHODS: The participants were classified according to somatization and control groups based on the somatization symptom scales of the Symptom Checklist-90-Revised and Somatosensory Amplification Scale scores. ERP were recorded in the somatization and control groups while participants were performing the task to respond with neutral (standard stimuli) or disease/body-related words (target stimuli). We compared N100, P200, and P300 ERP components between the two groups. RESULTS: In the somatization group, the reaction times to disease/body-related words were faster than for neutral words. In ERP analysis, N100 to standard stimuli was not observed in the somatization group. The somatization group showed higher P200 and P300 amplitudes to target stimuli than standard stimuli. On the contrary, in the control group, no difference in P200 and P300 amplitudes was observed between target and standard stimuli. CONCLUSION: It is suggested that individuals exhibiting somatization tendencies have automatic attentional bias to disease/body-related stimuli and interpret disease/body-related stimuli as self-relevant stimuli.
Subject(s)
Bias , Evoked Potentials , Reaction Time , Weights and MeasuresABSTRACT
A 55-year-old male patient presented with tense bullae on the extremities and trunk.Histological examination revealed subepidermal vesicles and superficial dermal infiltration of eosinophils and lymphocytes.The patient was primarily diagnosed with bullous pemphigoid.However,serum autoantibodies of the patient bound to the dermal side of salt-split skin,and no serum antibodies against BP180,BP230 or type Ⅶ collagen were detected by enzyme-linked immunosorbent assay.Hence,the diagnoses of bullous pemphigoid and epidermolysis bullosa acquisita were excluded.As Western blot and immunoprecipitation analysis showed,there existed antibodies capable of binding to a dermal antigen with a relative molecular mass of 200 000 in the serum of the patient.Based on the above findings,the patient was diagnosed as anti-laminin γ1 (p200) pemphigoid.
ABSTRACT
Anti-p200 pemphigoid is an autoimmune subepidermal bullous disease characterized by circulating and tissue-bound autoantibodies directed against a 200 kD protein of the human dermis. We report a 78-year-old male who was presented with bullous eruptions on the trunk, extremities, which clinically resemble bullous pemphigoid, epidermolysis bullosa aquisita, linear IgA dermatosis or dermatitis herpetiformis. Oral muscosa of the lower lip was also affected. Histopathological examination of a skin biopsy specimen from the trunk revealed subepidermal blister and infiltration predominantly by neutrophils. Direct immunofluorescence revealed linear deposits of IgG, C3 and IgA at the basement membrane zone. Indirect immunofluorescence using salt-split skin showed that IgG antibodies bound on the dermal side. Immunoblotting with dermal extracts showed that the patient's IgG autoantibodies reacted with a 200 kD protein. The patient showed good response to dapsone.
Subject(s)
Aged , Humans , Male , Antibodies , Autoantibodies , Basement Membrane , Biopsy , Blister , Dapsone , Dermatitis Herpetiformis , Dermis , Epidermolysis Bullosa , Extremities , Fluorescent Antibody Technique, Direct , Fluorescent Antibody Technique, Indirect , Immunoblotting , Immunoglobulin A , Immunoglobulin G , Linear IgA Bullous Dermatosis , Lip , Neutrophils , Pemphigoid, Bullous , SkinABSTRACT
Anti-p200 pemphigoid is an autoimmune subepidermal bullous disease characterized by circulating and tissue-bound autoantibodies directed against a 200 kD protein of the human dermis. We report a 78-year-old male who was presented with bullous eruptions on the trunk, extremities, which clinically resemble bullous pemphigoid, epidermolysis bullosa aquisita, linear IgA dermatosis or dermatitis herpetiformis. Oral muscosa of the lower lip was also affected. Histopathological examination of a skin biopsy specimen from the trunk revealed subepidermal blister and infiltration predominantly by neutrophils. Direct immunofluorescence revealed linear deposits of IgG, C3 and IgA at the basement membrane zone. Indirect immunofluorescence using salt-split skin showed that IgG antibodies bound on the dermal side. Immunoblotting with dermal extracts showed that the patient's IgG autoantibodies reacted with a 200 kD protein. The patient showed good response to dapsone.
Subject(s)
Aged , Humans , Male , Antibodies , Autoantibodies , Basement Membrane , Biopsy , Blister , Dapsone , Dermatitis Herpetiformis , Dermis , Epidermolysis Bullosa , Extremities , Fluorescent Antibody Technique, Direct , Fluorescent Antibody Technique, Indirect , Immunoblotting , Immunoglobulin A , Immunoglobulin G , Linear IgA Bullous Dermatosis , Lip , Neutrophils , Pemphigoid, Bullous , SkinABSTRACT
Se efectúa una revisión del penfigoide ampollar anti-P200 desde el punto de vista clínico, histopatológico, inmunológico como su tratamiento y múltiples diagnósticos diferenciales.
A review of the anti-P200 pemphigoid from the clinical, histopathological, immunological are updated, as well assess to its treatment and various differentials diagnosis.
ABSTRACT
Anti-p200 pemphigoid is a recently defined subepidermal immunobullous disease. Most anti-p200 pemphigoid patients show the clinical features of bullous pemphigoid, dermatitis herpetiformis and linear IgA disease. It is characterized by the binding of circulating IgG autoantibodies to the dermal side of 1 M NaCl split skin, and by reactivity of these autoantibodies to a unique 200-kD antigen on immunoblot of dermal extract. On immunoelectron microscopic examination, these autoantibodies deposit at the lamina lucida-lamina densa interface. Herein, we report two cases of anti-p200 pemphigoid, as well as their favorable response to treatment with systemic corticosteroid, colchicine and dapsone.
Subject(s)
Humans , Autoantibodies , Colchicine , Dapsone , Dermatitis Herpetiformis , Immunoglobulin A , Immunoglobulin G , Pemphigoid, Bullous , SkinABSTRACT
Anti-p200 pemphigoid is a newly defined autoimmune subepidermal blistering disease, which is characterized by the presence of IgG autoantibodies to the dermal side of 1M NaCl split skin as well as by the reactivity of these antibodies to a novel 200-kDa antigen on immunoblot analysis of a dermal extract. We describe a 49-year-old Korean male who presented with a bullous eruption on the whole body, which clinically resembled bullous pemphigoid or epidermolysis bullosa acquisita. A histopathological examination of a lesional skin biopsy specimen showed an area of dermal-epidermal separation and mixed dermal inflammatory infiltrates consisting of lymphocytes, neutrophils, and eosinophils. Direct immunofluorescence showed a linear deposition of IgG and C3 along the basement membrane zone. Indirect immunofluorescence demonstrated circulating IgG autoantibodies directed against the dermal side of the 1M NaCl split skin. Immunoblot analysis of dermal extracts revealed the patient's sera recognized the 200-kDa antigen. This is the first Korean case of an anti-p200 pemphigoid who showed good response to the treatment with systemic corticosteroids and dapsone.
Subject(s)
Humans , Male , Middle Aged , Autoantibodies/immunology , Pemphigoid, Bullous/diagnosisABSTRACT
Objective:In order to determine the nature of P 200 autoantigen Methods:12 cases of anti-P 200 pemphigoid sera were collected The skin sections from 6 cases of recessive dystrophic epidermolysis bullosa were studied with these sera by indirect immunofluorescence Results:All the 12 anti-P 200 pemphigoid sera could react with basement membrane zone (BMZ)of 5 cases of recessive dystrophic epidermolysis bullosa, while epidermolysis bullosa acquisita sera were negative in these skins In addition, in a case of recessive dystrophic epidermolysis bullosa, epidermolysis bullosa acquisita sera react with both BMZ and intracytoplasmic deposition of type Ⅶ collagen, while no anti-P 200 pemphigoid sera showed this reactivity Conclusion:These results suggested that the 200 kD antigen is not a component of type Ⅶ collagen, but a specific autoantigen