Revista alergia Mexico (Tecamachalco, Puebla, Mexico : 1993)最新文献

Background: Hymenoptera stings can produce IgE-mediated reactions, toxic reactions, or atypical reactions, which are rare. Cold urticaria has been described among the cutaneous manifestations in the atypical ones, but there is only one case of chronic urticaria.

Case report: A 56-year-old female patient experienced palmoplantar pruritus and generalized urticaria 60 minutes after two vespid stings, requiring medical assistance and several cycles of home treatment with oral antihistamines and corticosteroids for resolution in 12 weeks. Allergological studies showed normal tryptase and primary sensitization to Polistes dominula venom. Given the patient's profession, venom immunotherapy was started with Polistes dominula 100% without recurrence of urticaria after its administration.

Conclusions: We present a case of IgE-mediated systemic reaction followed by self-limited chronic urticaria, related chronologically to the same vespid sting trigger.

Severe asthma is an entity with a complex diagnosis, requiring an adequate differential diagnosis and identification of endotypes for a correct approach and therapeutic process. In the present review, we show a synthesis of the current literature on the diagnosis, pathophysiology, and management of severe asthma, having critically analyzed the evidence in search engines such as Medline, Scopus, and Embase.

Objective: To identify through In Silico analysis the possible molecular mimicry between Der p 23 and antigens from allergenic sources.

Methods: Identity was sought between Der p 23 and proteins from the mite families Pyroglyphidae, Acaridae, Chortoglyphidae and Echimyopodidae, through PSI-BLAST and They used PRALINE and EMBOSS for the alignments. Antigens with resolved experimental structure were obtained from Protein Data Bank and those not reported were generated using Swiss Model server and ALPHAFOLD 2. Epitope prediction was carried out with the Ellipro server and Pymol 2.3 was used to visualize the 3D models.

Results: The analysis between Pyroglyphidae allergens and Der p 23 showed identity with the endochitinase-like protein of D. pteronyssinus, and the type 2 chitin binding domain of D. farinae, with identities between 85 and 100%, with coverage of 100%, and 75% respectively. The allergens Der f 23 and Der p 23 of D. farinae and D. pteronyssinus had 100% coverage with identities of 85.42% and 79.59%, respectively. Among the allergens of Tyrophagus putrescentiae, binding to chitin, oviduct-specific glycoprotein and Cda4p were included, which had identity values corresponding to 40%, 42.22% and 34.78%, with coverage values that did not exceed the 55%. No results were found for Chortoglyphidae and Echimyopodidae.

Conclusion: There is molecular mimicry and structural homology between Der P 23 and allergens from allergic sources of the Pyroglyphidae and Acaridae families. Potential epitopes were identified in Der p 23, which could present cross-reactivity with the proteins of the allergenic sources studied, which must be demonstrated in In vitro and In vivo studies. In vitro and in vivo work is needed to demonstrate the results obtained in the In Silico analysis.

Methods: We took Peripheral blood samples from adult patients over 60 years of age with a confirmed diagnosis of IPF through biopsy or clinical criteria. Plasma separation was performed, and proinflammatory cytokines were measured using CBA. This study received approval from the ethics and research committee of the Colombian Pulmonological Foundation.

Results: Patients with IPF exhibited an increase in cytokines such as IL-4, INFy, and IL-6 compared to healthy older adults.

Conclusion: Inflammatory disease has been associated with the development and coexistence of multiple chronic non-communicable diseases that have a higher incidence after 65 years of age. The involvement of adaptive immunity in the pathogenesis of IPF has been described as an imbalance in the Th1/Th2 lymphocyte response. Further studies are required to identify additional markers of immunosenescence that correlate with IPF.

Objective: The objective is to describe the HLA allelic frequency in PsA and correlate it with demographic and clinical variables.

Methods: Retrospective study of adult patients with a diagnosis of PsA (n=23) and healthy controls (n=46), all with a request for HLA-A, B, C, DR. Typing was performed using HLA-PCR/SSO LifeCodes and analyzed on the LUMINEX IS100/200 xMAP^® system. (Ethics/Code HMC2022-014).

Results: One hundred thirty-eight alleles were included from 69 individuals, 43,5% women, aged 44,5±16,5 years in patients with PsA, with a mean age of disease onset of 33.4±14 years. Only 9.5% had a high Body Mass Index and dyslipidemia was the most frequent comorbidity (34.8%), followed by high blood pressure (26,1%). 82% debuted with skin manifestation and once the joint disease was established, the predominance was peripheral (74%) due to arthritis/arthralgia in 74%, enthesitis in 30% and dactylitis in 13%. The allele frequencies were for HLA*A 2402 (13%), 3201 (13%) and 2427 (8,7%), for HLA*B 1402 (17,4%), 4002 (17,4%), 3801 (13%) and HLA*DR 0404 (17,4%), 0407 (13%). No HLA*B27 was identified and HLA*C0602 was only 2,2%. HLA A*0201 and DR*1301 were less frequent in controls versus PsA (p=0.024 and 0,029, respectively), while HLA*B1302 was frequent in PsA (p=0,035).

Conclusions: Curiously, there were no positive results for HLAB*27, which may be related to the population mix. HLA Cw6 is traditionally associated with psoriasis. However, its absence has been linked to nail disorders and PsA; consequently, in our study, it had a low frequency (2,2%). On the other hand, HLA*B1302 has been related to the disease and its early onset; in the healthy Colombian population, it has been described in 0,92%; in our group, it is found to be significant in patients without establishing a clinical association. Few previous studies report HLA results in PsA in Colombia.

Background: Brief erythematous-papular skin rashes suggest the diagnosis of urticaria; However, it may be another type of dermatitis, and complementary examinations must be carried out to establish its diagnosis.

Case report: 53-year-old female patient, diagnosed in 2016 with diffuse large B cell lymphoma, in complete remission. Since 2010, he has had episodes of erythematous-papular lesions lasting 24-36 hours. He received antihistamines, corticosteroids and omalizumab without clinical improvement. The ANA determination was positive (1/320), nuclear mitotic pattern. The skin biopsy was compatible with dermatitis herpetiformis. The study of celiac and locus antibodies showed positivity for HLA-DQ2 and DQ2.5 in heterozygosity. The diagnosis of dermatitis herpetiformis was established. Treatment consisted of a gluten-free diet and prescription of dapsone, with satisfactory results.

Conclusion: It is important to establish the differential diagnosis of patients with chronic urticaria who do not respond to the reference treatment, in addition to carrying out a thorough clinical examination and physical examination before starting treatment and relying on a multidisciplinary team to establish an accurate diagnosis and treatment. appropriate. Due to the side effects of dapsone, subsequent follow-up of patients is essential.

Objective: To carry out a preliminary analysis on the Treg lymphocyte counts present in the peripheral blood of allergic asthmatic children from the city of Cartagena, Colombia, compared to healthy controls.

Methods: We compared cytometry counts of ten asthmatic patients (age 7-16 years) and seven healthy controls (6-12 years), recruited in the city of Cartagena. Peripheral blood samples were stained using Cytek's 14-color cFluor Immunoprofiling kit (Cytek^® cFluor^® Immunoprofiling Kit 14 Color RUO kit), and analyzed on a Northern Lights™ spectral cytometer (Cytek^® Biosciences, Fremont, CA, USA), to read 50.000 events per sample. The data obtained were analyzed in SpectroFlo^® and FlowJo. The study was approved by the ethics committee of the University of Cartagena (SGR, Grant BPIN2020000100405).

Results: The frequency of CD3+, CD4+, CD25+, CD127- Tregs was 11% of all CD4+ T cells, with a range of minimum 8,1% and maximum 17,7%. There was no significant difference in the proportion of Tregs between allergic asthmatic patients and healthy controls (P = 0,2).

Conclusions: With this preliminary sample size, no significant differences were found in the Treg lymphocyte population between allergic asthmatic patients and healthy controls. The 14-color multiplexed panel is a useful tool not only to count CD3+ and CD4+ populations, but also to obtain the percentage of regulatory T cells using cell surface markers.

Objective: Analyze phylogenetic relationships and molecular mimicry of Cit s 2 and other plant profilins.

Methods: Online bioinformatics tools including Basic Local Alignment Search Tool (BLASTP), PRALINE and MEGA were used for multiple alignments and phylogenetic analysis. A 3D-homology model of Cit s 2 was predicted. Models were calculated with MODELLER. The best model was selected with the model scoring option of MAESTRO. Conserved regions between Cit s 2 and other profilins were located on the 3D model and antigenic regions were predicted by ElliPro server (3-5).

Results: Cit s 2 amino acid sequence (Uniprot code:P84177) was compared with other 30 profilins from different allergenic sources. The identity between Cit s 2 and other profilins ranged between 82 and 99%. The highest identity was observed with Cucumis melo (99%) followed by Prunus persica (98%) and Malus domestica (92%). High conserved antigenic regions were observed on the 3D predicted model. Seven lineal and six discontinuous epitopes were found in Cit s 2.

Conclusion: High conserved antigenic regions were observed on the 3D predicted model of Cit s 2, which might involve potential cross-reactivity between Cit s 2 and other profilins. Future studies are needed to further analyze these results.

Epstein-Barr virus (EBV) is an gamma of herpes virus affecting exclusively humans, was the first oncogenic virus described and is associated with over seven different cancers. Curiously, the exchange of genes during viral infections has enabled the evolution of other cellular organisms, favoring new functions and the survival of the host. EBV has been co-evolving with mammals for hundreds of millions of years, and more than 95% of adults have been infected in one moment of their life. The infection is acquired primarily during childhood, in most cases as an asymptomatic infection. However, during adolescence or young adulthood, around 10 to 30% develop infectious mononucleosis. The NK and CD8+ T cells are the cytotoxic cells of the immune system that focus on antiviral responses. Importantly, an essential role of NK and CD8+ T cells has been demonstrated during the control and elimination of EBV-infected cells. Nonetheless, when the cytotoxic function of these cells is compromised, the infection increases the risk of developing lymphoproliferative diseases and cancer, often fatal. In this review, we delineate EBV infection and the importance of cytotoxic responses by NK and CD8+ T cells during the control and elimination of EBV-infected cells. Furthermore, we briefly discuss the main inborn errors of immunity that compromise cytotoxic responses by NK and CD8+ T cells, and how this scenario affects the antiviral response during EBV infection. Finally, we conclude the review by underlying the need for an effective EBV vaccine capable of preventing infection and the consequent development of malignancies and autoimmune diseases.

Objective: To quantify the production of Th1/Th2/Th17 cytokines induced by Ascaris lumbricoides antigens in peripheral blood mononuclear cells (PBMCs) using a multiplex technique.

Methods: PBMCs were cultured from individuals with mild A. lumbricoides infection (n = 20) and uninfected individuals (n = 21) and stimulated with A. lumbricoides extract (ExtAscaris), a mix of anti-CD2/CD3/CD28 (CDmix) as a positive control, and only medium (negative control). Cytokines in the supernatants were measured using the BD™ Cytometric Bead Array Human Th1/Th2/Th17 kit, to identify IFN-γ, TNF, IL-10, IL-6, IL-4, IL-2, and IL-17A. Readings were taken on a spectral cytometer (Northern Lights, Cytek, USA), and analysis was performed using R software with packages "tidyverse," "beadplexr," "flowCore," and "arsenal." Cytokine concentrations were calculated using a 5-parameter logistic curve. The t-test was used to compare cases and controls, and statistical significance was set at p < 0.05. The study was approved by the Ethics Committee of the University of Cartagena and the participants provided informed consent. This study was financially supported by the Colombian Sistema General de Regalías under the BPIN2020000100405 - BPIN2020000100364.

Results: Efficient fluorescence intensity extraction for each cytokine was achieved using detection channel R8 and the "mclust" clustering model (Figure 1). No significant differences were found in the levels of the seven cytokines between cases and controls (Figure 2). Although the IFN-γ response to ExtAscaris was higher in cases than in controls (252.5 ng/mL vs. 173.1 ng/mL), the difference was not significant. IL-17A (detection limit: 18.9 pg/mL) was more detectable in cases than controls (5 cases, 23% vs. 2 controls, 9.5%). IL-4 was only detected in the supernatants from CDmix-stimulated cultures but not with the Ascaris extract (Figure 2).

Conclusions: The multiplex technique using spectral flow cytometry combined with open-source software analysis proved applicable for quantifying cytokines induced by A. lumbricoides antigens in PBMCs. However, a more sensitive method is needed to evaluate IL-4 response in the context of ascariasis. The results did not reveal significant differences in cytokine production between cases and controls for the evaluated stimuli.