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1.
J Agric Food Chem ; 72(23): 13402-13414, 2024 Jun 12.
Artigo em Inglês | MEDLINE | ID: mdl-38821040

RESUMO

Scy p 8 (triosephosphate isomerase) as a crab allergen in inducing distinct T-helper (Th) cell differentiation and a linear epitope associated with allergenicity remain elusive. In this study, mice sensitized with Scy p 8 exhibited significantly upregulated levels of IgE, IgG1, and IL-4 release, inducing a Th2 immune response. Moreover, the release of IFN-γ (Th1) and the levels of Treg cells were downregulated, while IL-17A (Th17) was upregulated, indicating that Scy p 8 disrupted the Th1/Th2 balance and Th17/Treg balance in mice. Furthermore, bioinformatics prediction and serum samples from crab-allergic patients and mice enabled the discovery of 8 linear epitopes of Scy p 8. Meanwhile, the analysis of peptide similarity and tertiary superposition revealed that 8 epitopes of Scy p 8 exhibited conservation across various species, potentially resulting in cross-reactivity. These findings possess the potential to enhance the comprehension of crab allergens, thereby establishing a foundation for investigating cross-reactivity.


Assuntos
Alérgenos , Braquiúros , Epitopos , Camundongos Endogâmicos BALB C , Animais , Braquiúros/imunologia , Braquiúros/genética , Braquiúros/química , Alérgenos/imunologia , Alérgenos/química , Alérgenos/genética , Humanos , Epitopos/imunologia , Epitopos/química , Camundongos , Feminino , Hipersensibilidade a Frutos do Mar/imunologia , Imunoglobulina E/imunologia , Proteínas de Artrópodes/imunologia , Proteínas de Artrópodes/genética , Proteínas de Artrópodes/química , Imunoglobulina G/imunologia , Imunoglobulina G/sangue , Células Th2/imunologia , Reações Cruzadas , Masculino , Interleucina-4/imunologia , Interleucina-4/genética , Adulto , Células Th1/imunologia , Interferon gama/imunologia , Interferon gama/genética
2.
BMC Pediatr ; 24(1): 292, 2024 Apr 30.
Artigo em Inglês | MEDLINE | ID: mdl-38689260

RESUMO

BACKGROUND: Breast milk contains various crucial nutrients and biologically active substances and is ideal for newborns. This study aimed to analyze the composition of breast milk from mothers of premature and full-term infants and its influences on the growth of infants. METHODS: Infant-mother dyads examined at our Hospital (March 2016 to May 2017) were included. Milk was collected at 0-1 month, 2-3 months, and 5-6 months and analyzed using a MIRIS human milk analyzer. Z-scores of weight-for-length (WLZ), weight-for-age (WAZ), and length-for-age (LAZ) were calculated. RESULTS: This study included full-term (> 37 weeks of gestation, n = 177) and premature (< 37 weeks, n = 94) infant-mother dyads. The premature infants showed higher ΔWAZ, ΔLAZ, and ΔWLZ from infancy to toddlerhood for the physical growth speed, compared with term infants (P < 0.001). All proteins and true protein components of breast milk decreased with infants' age (P < 0.001). For premature and full-term infants, differences in ΔWAZ and ΔLAZ from birth to infancy and the difference in ΔLAZ, WAZ, and LAZ in toddlerhood were positively associated with non-protein nitrogen (NPN) (all P < 0.05), while the Z-score differences in ΔWLZ from birth to infancy were negatively associated with NPN (all P < 0.05). For premature babies, from birth to infancy stage, ΔWAZ was positively correlated with NPN and carbohydrates while negatively correlated with dry matter (all P < 0.05), and ΔLAZ correlated with NPN (ß = 0.428, P = 0.005). CONCLUSION: Breastfeeding helped premature infants compensatory growth when compared to term infants. Whileduring early infancy stage ΔWLZ gain was negatively associated with increased amounts of NPN in breast milk. This might mean although NPN increase the Z-scores of weight-for-age and length-for-age, with no rise in adipose tissue mass.


Assuntos
Desenvolvimento Infantil , Recém-Nascido Prematuro , Leite Humano , Humanos , Leite Humano/química , Feminino , Recém-Nascido Prematuro/crescimento & desenvolvimento , Recém-Nascido , Lactente , Masculino , Desenvolvimento Infantil/fisiologia , Estatura , Adulto , Peso Corporal
3.
J Agric Food Chem ; 2023 Nov 06.
Artigo em Inglês | MEDLINE | ID: mdl-37931089

RESUMO

Filamin C is an allergen of Scylla paramamosain (Scy p 9), and six IgE linear epitopes of the allergenic predominant region had previously been validated. However, the IgE epitope and structure-allergenicity relationship of Scy p 9 are unclear. In this study, a hydrophobic bond was found to be an important factor of conformation maintaining. The critical amino acids in the six predicted conformational epitopes were mutated, and the IgE-binding capacity and surface hydrophobicity of four mutants (E216A, T270A, Y699A, and V704A) were reduced compared to Scy p 9. Ten linear epitopes were verified with synthetic peptides, among which L-AA187-205 had the strongest IgE-binding capacity. In addition, IgE epitopes were mapped in the protruding surface of the tertiary structure, which were conducive to binding with IgE and exhibited high conservation among filamin genes. Overall, these data provided a basis for IgE epitope mapping and structure-allergenicity relationship of Scy p 9.

4.
J Agric Food Chem ; 71(24): 9508-9518, 2023 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-37289596

RESUMO

As the main allergenic food, shrimp can trigger allergic reactions in various degrees. In this study, arginine kinase (AK) was identified as an allergen in Oratosquilla oratoria by LC-MS/MS. The open reading frame of AK was obtained, which included 356 amino acids, and recombinant AK (rAK) was expressed in Escherichia coli. The results of immunological analysis and circular dichroism showed that rAK displayed similar IgG-/IgE-binding activity and structure as native AK. Besides, five IgE linear epitopes of AK were verified by serological analysis, on the basis of which an epitope-deleted derivative was obtained and named as mAK-L. It has been shown that mAK-L displayed hypo-immunoreactivity compared to rAK, and the contents of secondary structures were different. In conclusion, these discoveries enrich the overall understanding of crustacean allergens and epitopes and set the foundations for food allergy diagnosis and immunotherapy.


Assuntos
Arginina Quinase , Hipersensibilidade Alimentar , Animais , Epitopos/química , Arginina Quinase/genética , Cromatografia Líquida , Espectrometria de Massas em Tandem , Crustáceos/metabolismo , Alérgenos/química , Imunoglobulina E
5.
Food Chem ; 405(Pt B): 134947, 2023 Mar 30.
Artigo em Inglês | MEDLINE | ID: mdl-36410213

RESUMO

The subunit of tropomyosin (α-TM) from Haliotis discus hannai is an important allergen. The methods to reduce the immunoreactivity of α-TM are worth investigating. Thus, this study confirmed the reacted conditions of α-TM with transglutaminase (TG)-catalyzed cross-linking reaction, TG-catalyzed glycosylation, and glycation. Three processing technologies reduced significantly the contents of α-helix and hydrophobic force of α-TM and increased the surface hydrophobicity. A serological experiment confirmed that the glycated α-TM with xylose showed the lowest IgG/IgE-binding capacity. The inhabitation dot blot displayed that five epitope peptides could bind with the site-specific IgE prepared by the glycated α-TM. Three in nine glycated sites (M68, N202, and N203) were verified to modify-two epitopes (L-HTM-3 and L-HTM-7) of α-TM, which affected the immunoreactivity of α-TM during glycation. These results indicated that glycation would be desired for developing hypo-allergenic abalone products.


Assuntos
Gastrópodes , Tropomiosina , Animais , Tropomiosina/genética , Gastrópodes/genética , Epitopos , Transglutaminases , Glicopirrolato , Imunoglobulina E
6.
Front Public Health ; 10: 993471, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36438244

RESUMO

Prenatal exposure to second-hand smoke (SHS) is associated with increased neurodevelopmental problems in children, however, its impact on the risk of developmental coordination disorder (DCD) in preschoolers have not been studied thoroughly. Herein, we probed this association based on a nationwide retrospective cohort study of 149,005 preschoolers in China. We divided the objects into the prenatal SHS-exposed group or the no prenatal smoke exposed group (NS-exposed group). Preschoolers were assessed for motor proficiency by the Chinese version of Little Developmental Coordination Disorder Questionnaire (LDCDQ). Multivariable logistic regression was used to evaluate the associations. The prevalence of prenatal SHS exposure was 23.89%. Generally, the prevalence of suspected DCD was significantly higher in prenatal SHS-exposed group (16.38% VS. 14.19%, P < 0.001). With the increase of age, the mean total scores of LDCDQ of both boys and girls increased gradually; and the prevalence of suspected DCD in girls was higher than that in boys in the same age group. After adjusting for covariates, prenatal SHS exposure had the negative association with the total score of LDCDQ and increased the risk of suspected DCD. Our results suggest a need for interventions designed to reduce maternal SHS exposure during pregnancy, early screen for DCD and increase targeted movement and coordination skill training for vulnerable children.


Assuntos
Transtornos das Habilidades Motoras , Poluição por Fumaça de Tabaco , Masculino , Criança , Gravidez , Feminino , Humanos , Poluição por Fumaça de Tabaco/efeitos adversos , Transtornos das Habilidades Motoras/epidemiologia , Transtornos das Habilidades Motoras/etiologia , Estudos Retrospectivos , China/epidemiologia , Prevalência
7.
Food Funct ; 13(22): 11518-11531, 2022 Nov 14.
Artigo em Inglês | MEDLINE | ID: mdl-36318047

RESUMO

The design of hypoallergenic derivatives is a new strategy for allergen-specific immunotherapy. Although hypoallergenic derivatives of Scylla paramamosain (mud crab) heat-stable tropomyosin (TM) and myosin light chain (MLC) have been preliminarily explored, their allergenicity in vivo needs to be further studied. In this work, recombinant allergens (wtTM, wtMLC) and hypoallergenic derivatives (mtTM, mtMLC) were purified. IgE-binding frequencies of wtTM and wtMLC in 177 crab-sensitised patients were 32.8% and 11.9%, respectively. In the Balb/c mouse model, mtTM and mtMLC caused mild intestinal inflammation, did not activate T-helper (Th) 2 immune response (interleukin-4, anaphylactic mediator, IgE, and IgG1 antibodies were not significantly increased) but could significantly promote the production of interleukin-10, which equilibrated Th1/Th2 cells, thus alleviating allergic symptoms. Moreover, mtTM and mtMLC-induced rabbit/mice anti-IgG antibodies could effectively block wtTM and wtMLC binding to patients' sera IgE in vitro. These results indicate that hypoallergenic derivatives offer the promise for an immunotherapeutic regimen for crab allergy.


Assuntos
Braquiúros , Hipersensibilidade Alimentar , Coelhos , Camundongos , Animais , Alérgenos , Camundongos Endogâmicos BALB C , Imunoglobulina E , Temperatura Alta , Imunoglobulina G , Hipersensibilidade Alimentar/terapia
8.
J Agric Food Chem ; 70(38): 12189-12202, 2022 Sep 28.
Artigo em Inglês | MEDLINE | ID: mdl-36110087

RESUMO

Tropomyosin (Scy p 1) and myosin light chain (Scy p 3) are investigated to be important heat-stable allergens in Scylla paramamosain. However, the epitopes of Scy p 1 and Scy p 3 are limited. In this study, recombinant Scy p 1 and Scy p 3 had similar IgE-binding capacity to natural proteins. Mimotopes of Scy p 1 and Scy p 3 were analyzed by bioinformatics, phage display, and one-bead-one-compound technology. Ten linear epitopes of Scy p 1 and seven linear epitopes of Scy p 3 were identified by synthetic peptides and inhibition dot blot. Meanwhile, three conformational epitopes of Scy p 1 and seven conformational epitopes of Scy p 3 were verified by site-directed mutagenesis and the serological test. Furthermore, strong IgE-binding epitopes of Scy p 1 and Scy p 3 were conserved in multiple crustaceans. Overall, these epitopes could enhance our understanding of crab allergens, which lay the foundation for a cross-reaction.


Assuntos
Alérgenos , Braquiúros , Alérgenos/química , Sequência de Aminoácidos , Animais , Braquiúros/química , Epitopos/química , Temperatura Alta , Imunoglobulina E , Cadeias Leves de Miosina , Peptídeos/metabolismo , Tropomiosina/genética
9.
Food Funct ; 13(17): 9078-9090, 2022 Aug 30.
Artigo em Inglês | MEDLINE | ID: mdl-35943407

RESUMO

Tropomyosin (TM) is an important allergen in molluscans. However, there was a lack of information about TM as an allergen in oysters. TM was purified and identified from Alectryonella plicatula (ATM), and its primary sequence was cloned and encoded with 284 amino acids (AAs). Chemical denaturants were used to destroy the structure to confirm that linear epitopes played a major role in the immunoglobulin E-binding capacity of ATM. Subsequently, nine linear epitopes were identified using a serological test. The peptide with AA27-41 was regarded as the key epitope because it could be recognized strongly by most sera of oyster-sensitive individuals in comparison to other epitope peptides. Finally, the epitopes and the primary sequence of TM among shellfish were aligned to find the two conserved epitopes (AA117-132 and AA164-178) in oyster, octopus, abalone, scallop, clam, shrimp, and crab. Overall, these data provide a foundation for the allergenicity and cross-reactivity of TM.


Assuntos
Ostreidae , Tropomiosina , Alérgenos , Sequência de Aminoácidos , Animais , Epitopos/química , Imunoglobulina E , Peptídeos , Tropomiosina/química
10.
Artigo em Inglês | MEDLINE | ID: mdl-35878431

RESUMO

Perfluorinated compounds (PFCs) are a group of widely used synthetic chemicals. Owing to their unique chemical properties, PFCs can accumulate in the environment and living organisms. In vitro and in vivo studies have demonstrated the adverse effects of exposure to PFCs, resulting in increased concern. Therefore, a fast, reliable analytical method is crucial for human biomonitoring and health risk assessment. This study used two isotope internal standards to identify and quantify 24 PFCs in umbilical cord serum samples, based on classical liquid-liquid extraction (LLE) with liquid chromatography tandem mass spectrometry (LC-MS/MS). According to our review of the literature, this study is the first to determine the TFHSA, S4hPDS, S4hPOS, S4hPHS, SPHeS, SPNoS, and SPPeS by using this developed method. The average spiked recoveries of 24 PFCs were acceptable, ranging from approximately 64.0% to 124%; RSDs ranged from 0.74% to 11.2%; LOD and LOQ ranged from 0.013 to 0.248 µg/L and from 0.030 to 0.747 µg/L, respectively. This method was applied to measure the PFCs in umbilical cord serum samples; 24 PFCs were detected in the investigated samples, which are comparable to those reported in the literature. TFHSA, S4hPDS, S4hPOS, S4hPHS, SPHeS, SPNoS, and SPPeS were also detected in the samples, which should be investigated in further research. The sensitivity, accuracy, and precision of the developed method are sufficient for its application in large-scale biomonitoring studies.


Assuntos
Fluorocarbonos , Espectrometria de Massas em Tandem , Cromatografia Líquida de Alta Pressão/métodos , Cromatografia Líquida/métodos , Fluorocarbonos/análise , Humanos , Espectrometria de Massas em Tandem/métodos , Cordão Umbilical/química
11.
J Agric Food Chem ; 70(29): 9201-9213, 2022 Jul 27.
Artigo em Inglês | MEDLINE | ID: mdl-35848932

RESUMO

Oyster is a common shellfish product in China, which is associated with food allergy. However, there is still lack of research on allergens in oysters. In this study, tropomyosin (TM), an important allergen of Crassostrea angulata, was purified and identified by mass spectrometry. Subsequently, TM was cloned and expressed, with a sequence of size 852 bp, encoding 284 amino acid residues. The results of circular dichroism, digestion assay, inhibition enzyme-linked immunosorbent assay, and basophil activation test showed that recombinant TM had similar physicochemical properties and immunological properties to native TM. Furthermore, two conformational mimotopes were obtained and 10 IgE linear epitopes were verified. Meanwhile, different degrees of cross-reactivity were observed between C. angulata TM and the other 8 shellfish TMs using antibodies and serological analysis, which may relate to the 3 conserved epitope regions. These findings are expected to provide a theoretical basis for the molecular diagnosis of oyster allergy and cross-reactivity among shellfish.


Assuntos
Crassostrea , Tropomiosina , Alérgenos/química , Sequência de Aminoácidos , Animais , Epitopos/química , Imunoglobulina E , Tropomiosina/química
12.
J Dermatolog Treat ; 33(7): 2931-2939, 2022 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-35708329

RESUMO

BACKGROUND: Atopic dermatitis (AD) is a common skin disease during infancy, but the preventive effect of probiotics on AD remains unclear. AIM: To evaluate the efficacy of probiotic supplementation for the prevention of AD in infants. METHODS: PubMed, Cochrane Library, and Embase databases were reviewed for relevant randomized controlled trials (RCTs). Two authors independently extracted the data. The primary endpoint was the risk of AD in infants. Risk ratio (RR) and 95% confidence interval (CI) were calculated. RESULTS: A total of 20 related articles including 22 studies were included. A significant reduction in AD risk was revealed for the probiotic group compared to the control group (RR 0.76; 95% CI 0.67-0.87). Subgroup analyses by participant receiving intervention revealed that not only probiotics given to mother (RR 0.70; 95% CI 0.57-0.85) or given to mother and infant (RR 0.76; 95% CI 0.61-0.95) were effective in preventing AD in infants, and probiotics given to infants alone (RR 0.76; 95% CI 0.60-0.96) still effectively decreased the risk of AD. CONCLUSION: Probiotic supplementation reduced the risk of developing AD in infants. Furthermore, probiotic supplementation given to mother or to mother and infant could effectively prevent AD in infants.


Assuntos
Dermatite Atópica , Probióticos , Lactente , Humanos , Dermatite Atópica/prevenção & controle , Probióticos/uso terapêutico , Razão de Chances
13.
J Agric Food Chem ; 70(4): 1282-1292, 2022 Feb 02.
Artigo em Inglês | MEDLINE | ID: mdl-35040643

RESUMO

Filamin C (FLN c) is a novel allergen in shellfish. In this study, FLN c from Scylla paramamosain was divided into three regions for recombinant expression based on the number of domains and amino acids. Using dot blot and basophil activation tests, the allergic predominant region of FLN c was determined to be 336-531 amino acid positions (named FLN c-M). It was confirmed that by X-ray diffraction, the crystal structure of FLN c-M with immunoglobulin-like folding at a resolution of 1.7 Å was obtained. The monomer was a barrel structure composed of 16 ß-strands and 2 α-helices. Three conformational epitopes were predicted, six linear epitopes were verified by serological test, and they were positioned on the crystal structure of FLN c-M. For the first time, the crystal structure of the allergic predominant region of FLN c was determined, and it provided an accurate template for the localization of IgE epitopes.


Assuntos
Imunoglobulina E , Hipersensibilidade a Frutos do Mar , Alérgenos , Mapeamento de Epitopos , Filaminas/genética , Humanos
14.
Food Chem ; 373(Pt B): 131588, 2022 Mar 30.
Artigo em Inglês | MEDLINE | ID: mdl-34801289

RESUMO

Scylla paramamosain frequently elicits IgE-mediated type-I hypersensitivity reactions. Molecular candidates for crab allergen-specific immunotherapy have not been studied previously. In this study, reduced and alkylated (red/alk) derivatives with destroyed conformational epitopes and mutant derivatives (mtALLERGEN) with deleted heat/digestion-stable linear epitopes were produced of tropomyosin and myosin light chain. Structural changes and the allergenicity of derivatives was analyzed. Compared with wild-type allergens, red/alk derivatives had dramatically altered protein structures, whereas mtALLERGEN showed slightly structural effects. Enzyme linked immunosorbent assay revealed the heterogeneous epitope-recognition patterns with derivatives among 29 crab-sensitised patients, of whom 13% and 62% recognised conformational and linear epitopes, respectively, whereas 25% recognised both epitope types to the same extent. Furthermore, mtALLERGEN could not bind to IgE or induce basophil activation in some patients. These results imply that hypo-allergenic derivatives of crab myofibril allergens that specifically lacked linear epitopes may serve as viable candidates for immunotherapy.


Assuntos
Alérgenos , Braquiúros , Animais , Epitopos , Humanos , Imunoglobulina E , Tropomiosina
15.
JAMA Netw Open ; 4(12): e2137581, 2021 12 01.
Artigo em Inglês | MEDLINE | ID: mdl-34905005

RESUMO

Importance: It remains unknown whether children born at different degrees of prematurity, early term, and post term might have a higher risk of developmental coordination disorder (DCD) compared with completely full-term children (39-40 gestational weeks). Objective: To differentiate between suspected DCD in children with different gestational ages based on a national representative sample in China. Design, Setting, and Participants: A retrospective cohort study was conducted in China from April 1, 2018, to December 31, 2019. A total of 152 433 children aged 3 to 5 years from 2403 public kindergartens in 551 cities of China were included in the final analysis. A multilevel regression model was developed to determine the strength of association for different gestational ages associated with suspected DCD when considering kindergartens as clusters. Main Outcomes and Measures: Children's motor performance was assessed using the Little Developmental Coordination Disorder Questionnaire, completed by their parents. Gestational age was determined according to the mother's medical records and divided into 7 categories: completely full term (39 to 40 weeks' gestation), very preterm (<32 weeks), moderately preterm (32-33 weeks), late preterm (34-36 weeks), early term (37-38 weeks), late term (41 weeks), and post term (>41 weeks). Results: A total of 152 433 children aged 3 to 5 years (mean [SD] age, 4.5 [0.8] years), including 80 370 boys (52.7%) and 72 063 girls (47.3%), were included in the study. There were 45 052 children (29.6%) aged 3 years, 59 796 (39.2%) aged 4 years, and 47 585 (31.2%) aged 5 years. Children who were born very preterm (odds ratio [OR], 1.35; 95% CI, 1.23-1.48), moderately preterm (OR, 1.18; 95% CI, 1.02-1.36), late preterm (OR, 1.24; 95% CI, 1.16-1.32), early term (OR, 1.11; 95% CI, 1.06-1.16), and post term (OR, 1.17; 95% CI, 1.07-1.27) were more likely to be classified in the suspected DCD category on the Little Developmental Coordination Disorder Questionnaire than completely full-term children after adjusting for the same characteristics. Additionally, there was no association with suspected DCD in younger (aged 3 years) early-term and postterm children by stratified analyses. Conclusions and Relevance: In this cohort study, every degree of prematurity at birth, early-term birth, and postterm birth were associated with suspected DCD when compared with full-term birth. These findings have important implications for understanding motor development in children born at different gestational ages. Long-term follow-up and rehabilitation interventions should be considered for children born early and post term.


Assuntos
Deficiências do Desenvolvimento/diagnóstico , Deficiências do Desenvolvimento/epidemiologia , Transtornos das Habilidades Motoras/diagnóstico , Transtornos das Habilidades Motoras/epidemiologia , Criança , Pré-Escolar , China , Estudos de Coortes , Feminino , Humanos , Doenças do Prematuro/diagnóstico , Doenças do Prematuro/epidemiologia , Masculino , Estudos Retrospectivos
16.
J Agric Food Chem ; 69(43): 12870-12879, 2021 Nov 03.
Artigo em Inglês | MEDLINE | ID: mdl-34689550

RESUMO

Sarcoplasmic calcium-binding protein is a stable allergen in Scylla paramamosain and named Scy p 4. To explore the importance of linear epitopes in the immunoglobulin G (IgG)/immunoglobulin E (IgE)-binding capacity of Scy p 4, chemical denaturants were used to destroy the structure. Scy p 4 was reduced with dithiothreitol and subsequently alkylated with iodoacetamide (IAA). Furthermore, the structural analysis indicated that IAA-Scy p 4 was an unstructured protein. The inhibition enzyme-linked immunosorbent assay showed that IAA-Scy p 4 could inhibit the binding of Scy p 4 to sensitize serum, with inhibition rates reached 55%. Moreover, the linear mimotopes of Scy p 4 were predicted in silico. Three linear epitopes were verified by serological tests and named L-Scy p 4-1 (AA76-91), L-Scy p 4-2 (AA111-125), and L-Scy p 4-3 (AA137-146). Overall, these data provide an understanding of the relationship between the structure and allergenicity about Scy p 4, and the identified linear epitopes can be used for diagnosis and food processing of shellfish allergy.


Assuntos
Imunoglobulina G , Hipersensibilidade a Frutos do Mar , Alérgenos , Epitopos , Humanos , Imunoglobulina E
17.
Food Funct ; 12(18): 8570-8582, 2021 Sep 20.
Artigo em Inglês | MEDLINE | ID: mdl-34338271

RESUMO

Sarcoplasmic-calcium-binding protein (SCP) has been investigated as a novel allergen in Crassostrea angulata. Nevertheless, knowledge of its effector-cell-based allergic relevance and epitopes is limited. In this study, the heat-resistant allergen SCP was able to induce significant upregulation of CD63 and CD203c (p < 0.05), which showed obvious allergenicity in a basophil activation test. Furthermore, immunoinformatic tools, a one-bead-one-compound peptide library, and phage display technology were combined to analyze the allergenic epitopes of SCP. Five linear epitopes named L-SCP-1 (AA22-33), L-SCP-2 (AA64-75), L-SCP-3 (AA80-90), L-SCP-4 (AA107-116), and L-SCP-5 (AA144-159) were verified using serological tests. Additionally, two conformational epitopes (C-SCP-1 and C-SCP-2) were determined, and C-SCP-1 was located at one of the calcium-binding sites (AA106-117). Moreover, SCP showed weaker typical α-helical features and higher hydrophobicity after Ca2+ depletion, which reduced its IgE-binding capacity. Overall, these epitope data could enhance our understanding of oyster allergens, which could be used to develop hypoallergenic shellfish products.


Assuntos
Alérgenos/imunologia , Proteínas de Ligação ao Cálcio/imunologia , Crassostrea/imunologia , Epitopos/imunologia , Imunoglobulina E/imunologia , Hipersensibilidade a Frutos do Mar/imunologia , Proteínas de Frutos do Mar/imunologia , Adolescente , Adulto , Animais , Basófilos/imunologia , Cálcio/metabolismo , Proteínas de Ligação ao Cálcio/química , Criança , Pré-Escolar , Feminino , Temperatura Alta , Humanos , Masculino , Pessoa de Meia-Idade , Biblioteca de Peptídeos , Conformação Proteica , Estabilidade Proteica , Alinhamento de Sequência , Adulto Jovem
18.
J Agric Food Chem ; 69(16): 4865-4873, 2021 Apr 28.
Artigo em Inglês | MEDLINE | ID: mdl-33870691

RESUMO

Allergic reactions occur after the whole food is ingested, rather than the purified allergen. The present study explores the low-allergenic food processing for Litopenaeus vannamei by analysis of macrostructure, digestibility, and immunoreactivity. Furthermore, the presence of modified amino acids on the reported IgE epitopes was analyzed by mass spectrometry. Results showed that the combination processing of Maillard reaction (shrimp meat with galactose) with high temperature-pressure at 115 °C obviously changed the macrostructure and increased the digestibility for the shrimp meat. Meanwhile, the processing significantly reduced the IgG/IgE-binding activity of the shrimp meat. The hypo-IgE-binding activity in processed shrimp may be due to the modification of lysine, arginine, and cysteine residues in antigen epitopes. This is a comprehensive assessment of the specific amino acid residues modified by glycation of multiple allergens in processed L. vannamei, which provides a new research method to explore the hypo-IgE-binding activity in food.


Assuntos
Alérgenos , Hipersensibilidade Alimentar , Animais , Arginina , Cisteína , Epitopos , Imunoglobulina E , Lisina
19.
J Diabetes Res ; 2021: 8879786, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33681385

RESUMO

Previous studies have discovered that zinc-α2-glycoprotein (ZAG) is related to insulin resistance and lipid metabolism. The aim of the study is to explore the change of serum ZAG and its related factors in gestational diabetes mellitus (GDM). Eighty newly diagnosed GDM patients were enrolled in the case group, and 80 normal pregnant women were selected as the control group. The differences of baseline data between the two groups were compared, and the change of serum ZAG level and its relationship with related indexes was analyzed. Compared to the control group, the level of serum ZAG in GDM women decreased (P < 0.001). What is more, the serum ZAG level of overweight and normal subjects in two groups was also found to have statistical differences. The Pearson correlation (or Spearman correlation) analysis showed that serum ZAG level was negatively correlated with FPG, FINS, HOMA-IR, and TG (all P < 0.05) and positively correlated with HDL (P < 0.05). Multiple linear regression showed that HDL and HOMA-IR were independent factors of serum ZAG (P < 0.05). The level of serum ZAG in patients with gestational diabetes mellitus decreased, and HDL and HOMA-IR are the influencing factors in the case group.


Assuntos
Adipocinas/sangue , Diabetes Gestacional/sangue , Adulto , Biomarcadores/sangue , Glicemia/análise , Estudos de Casos e Controles , Diabetes Gestacional/diagnóstico , Regulação para Baixo , Feminino , Humanos , Insulina/sangue , Resistência à Insulina , Lipídeos/sangue , Gravidez
20.
Food Funct ; 12(5): 2032-2043, 2021 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-33528481

RESUMO

Food processing can change the structure and immunoreactivity of purified allergens, but the effect of food processing on the immunoreactivity of the processed and purified allergen is still poorly understood. In this study, tropomyosin (TM) was obtained from Scylla paramamosain and purified after different treatments. A basophil activation test was employed to detect the allergenicity of allergens. The protein structure was detected by mass spectrometry, circular dichroism spectroscopy and surface hydrophobicity. Critical amino acids were identified by Dot blot. Heating obviously affects the biochemical characteristics of TM. The allergenicity of TM was decreased in high temperature-pressure-processed crabs, due to alteration in the protein structure (e.g. denaturation). Seven critical amino acids, namely, R21, E103, E104, E115, A116, E122 and E156, related to the maintenance of the IgE-binding activity of TM were identified. This research of thermal processing helps to accurately reduce or eliminate the immunoreactivity of crabs by food processing.


Assuntos
Alérgenos , Braquiúros , Epitopos , Tropomiosina , Alérgenos/química , Alérgenos/imunologia , Alérgenos/farmacologia , Alérgenos/efeitos da radiação , Aminoácidos/química , Aminoácidos/imunologia , Animais , Teste de Degranulação de Basófilos , Basófilos/efeitos dos fármacos , Basófilos/metabolismo , Células Cultivadas , Epitopos/química , Epitopos/imunologia , Epitopos/efeitos da radiação , Humanos , Desnaturação Proteica , Tropomiosina/química , Tropomiosina/imunologia , Tropomiosina/efeitos da radiação
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