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2.
Front Immunol ; 15: 1326370, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38566993

RESUMEN

Background: While a few case-control studies indicated a possible correlation of IgG N-glycosylation patterns with pancreatitis, their restricted sample sizes and methodologies prevented conclusive insights into causality or distinguishing traits across pancreatitis types. Method: We conducted a two-sample Mendelian Randomization (MR) analysis to investigate the causal relationship between 77 IgG N-glycosylation traits and various types of pancreatitis, including acute pancreatitis (AP), chronic pancreatitis (CP), alcohol acute pancreatitis (AAP), and alcohol chronic pancreatitis (ACP). This analysis utilized summary-level data from genome-wide association studies (GWAS), employing methods such as IVW, MR-Egger, and weighted median. To ensure the robustness of our findings, several sensitivity analyses, including Cochran's Q statistic, leave-one-out, MR-Egger intercept, and MR-PRESSO global test were conducted. Result: Our study uncovered the causal relationship between specific IgG N-glycosylation traits and various types of pancreatitis. Notably, an increase in genetically predicted IGP7 levels was associated with a decreased risk of developing AP. For CP, our data suggested a protective effect associated with higher levels of both IGP7 and IGP31, contrasting with increased levels of IGP27 and IGP65, which were linked to a heightened risk. Moreover, in the case of AAP, elevated IGP31 levels were causatively associated with a lower incidence, while higher IGP26 levels correlated with an increased risk for ACP. Conclusion: This study establishes causal relationship between specific IgG N-glycosylation patterns and varying risks of different pancreatitis forms, underscoring their potential as predictive biomarkers. These findings necessitate further exploration into the underlying mechanisms, promising to inform more personalized diagnostic and therapeutic strategies in pancreatitis management.


Asunto(s)
Inmunoglobulina G , Pancreatitis Crónica , Humanos , Enfermedad Aguda , Etanol , Estudio de Asociación del Genoma Completo , Glicosilación , Pancreatitis Crónica/genética , Análisis de la Aleatorización Mendeliana
3.
Oncogene ; 43(20): 1506-1521, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38519641

RESUMEN

Wnt/ß-catenin signalling is aberrantly activated in most colorectal cancer (CRC) and is one key driver involved in the initiation and progression of CRC. However, mutations of APC gene in CRC patients retain certain activity of APC protein with decreased ß-catenin signalling and DKK4 expression significantly upregulates and represses Wnt/ß-catenin signalling in human CRC tissues, suggesting that a precisely modulated activation of the Wnt/ß-catenin pathway is essential for CRC formation and progression. The underlying reasons why a specifically reduced degree, not a fully activating degree, of ß-catenin signalling in CRC are unclear. Here, we showed that a soluble extracellular inhibitor of Wnt/ß-catenin signalling, DKK4, is an independent factor for poor outcomes in CRC patients. DKK4 secreted from CRC cells inactivates ß-catenin in fibroblasts to induce the formation of stress fibre-containing fibroblasts and myofibroblasts in culture conditions and in mouse CRC xenograft tissues, resulting in restricted expansion in tumour masses at primary sites and enhanced CRC metastasis in mouse models. Reduced ß-catenin activity by a chemical inhibitor MSAB promoted the CRC metastasis. Our findings demonstrate why reduced ß-catenin activity is needed for CRC progression and provide a mechanism by which interactions between CRC cells and stromal cells affect disease promotion.


Asunto(s)
Neoplasias Colorrectales , Péptidos y Proteínas de Señalización Intercelular , Metástasis de la Neoplasia , Vía de Señalización Wnt , beta Catenina , Neoplasias Colorrectales/patología , Neoplasias Colorrectales/metabolismo , Neoplasias Colorrectales/genética , Humanos , Animales , Péptidos y Proteínas de Señalización Intercelular/metabolismo , Péptidos y Proteínas de Señalización Intercelular/genética , Ratones , beta Catenina/metabolismo , beta Catenina/genética , Fibroblastos/metabolismo , Fibroblastos/patología , Línea Celular Tumoral , Masculino , Femenino , Ratones Desnudos
4.
Diabetes Metab Res Rev ; 40(2): e3780, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38367257

RESUMEN

AIMS: To assess the time-dependent risk of fracture in adults with type 2 diabetes receiving anti-diabetic drugs. MATERIALS AND METHODS: We searched MEDLINE, EMBASE, and Cochrane Library up to 18 November 2021, for randomized controlled trials (RCTs) and propensity-score-matched non-randomized studies (NRSs) comparing all anti-diabetic drugs with standard treatment or with each other on fracture in adults with type 2 diabetes. The study performed a one-stage network meta-analysis using discrete-time hazard regression with reconstructed individual time-to-event data. RESULTS: This network meta-analysis involved seven RCTs (65,051 adults with type 2 diabetes) with a median follow-up of 36 months and three propensity-score-based NRSs (17,954 participants) with a median follow-up of 27.3 months. Among anti-diabetic drugs, thiazolidinediones increased the overall hazard of fracture by 42% (95% credible interval [CrI], 3%-97%) and almost tripled the risk after 4 years (hazard ratio [HR], 2.74; 95% CrI, 1.53-4.80). Credible subgroup analysis suggested that thiazolidinediones increased the hazard of fracture only in females (HR, 2.19; 95% CrI, 1.26-3.74) but not among males (HR, 0.81; 95% CrI, 0.45-1.40). Moderate certainty evidence established that thiazolidinediones increase 92 fractures in five years per 1000 female patients. We did not find the risk of fractures with other anti-diabetic drugs including metformin, sulfonylureas, sodium-glucose cotransporter-2 (SGLT2) inhibitors, and dipeptidyl peptidase-4 (DPP-4) inhibitors. CONCLUSIONS: Long-term use of thiazolidinediones elevates the risk of fracture among females with type 2 diabetes. There is no evidence eliciting fracture risk associated with other anti-diabetic drugs.


Asunto(s)
Diabetes Mellitus Tipo 2 , Inhibidores de la Dipeptidil-Peptidasa IV , Fracturas Óseas , Tiazolidinedionas , Masculino , Adulto , Femenino , Humanos , Hipoglucemiantes/efectos adversos , Metaanálisis en Red , Diabetes Mellitus Tipo 2/complicaciones , Diabetes Mellitus Tipo 2/tratamiento farmacológico , Diabetes Mellitus Tipo 2/inducido químicamente , Inhibidores de la Dipeptidil-Peptidasa IV/efectos adversos , Fracturas Óseas/epidemiología , Fracturas Óseas/etiología , Fracturas Óseas/prevención & control , Tiazolidinedionas/efectos adversos
5.
Exp Clin Endocrinol Diabetes ; 131(12): 676-685, 2023 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-38056492

RESUMEN

BACKGROUND: Clinical observation suggests the atheroprotective effect of chloroquine and its derivatives, while its mechanism remains unclear. This study aimed to observe the protective effect of chloroquine against atherosclerosis and explore the underlying mechanism. METHODS: Ataxia telangiectasia mutated (ATM) wild-type or haploinsufficient apolipoprotein-E-knockout (ATM+/+ApoE-/- or ATM+/-ApoE-/-) mice were treated with different dosages of chloroquine. Anti-CD25 antibody was used to deplete natural Tregs in ATM+/+ApoE-/- mice. The atherosclerotic burden in different groups of mice was comprehensively evaluated by H&E staining and Masson staining. The effect of chloroquine on the regulatory T cells (Tregs) was assessed in vivo and in vitro by flow cytometry and immunohistochemical staining. The expression of related proteins was detected by real-time polymerase chain reaction and western blotting. RESULTS: In ATM+/+ApoE-/- mice, chloroquine alleviated atherosclerotic lesions, stabilized the plaque, and increased Treg counts in the atherosclerotic lesions and spleens. However, in ATM haploinsufficient mice (ATM+/-ApoE-/-), chloroquine no longer prevented atherosclerosis or impacted Treg counts. Abolishing Treg cells using an anti-CD25 antibody in vivo abrogated the atheroprotective effect of chloroquine. In vitro, chloroquine promoted the differentiation of Tregs from naïve T cells, which was accompanied by enhanced ATM/AMP-activated protein kinase (AMPK) activity and reduced downstream mammalian target of rapamycin (mTOR) activity. DISCUSSION: These findings suggest that chloroquine ameliorates atherosclerosis and stabilizes plaque by modulating Tregs differentiation through the regulation of the ATM/AMPK/mTOR pathway.


Asunto(s)
Ataxia Telangiectasia , Aterosclerosis , Placa Aterosclerótica , Ratones , Animales , Linfocitos T Reguladores/metabolismo , Cloroquina/farmacología , Cloroquina/metabolismo , Cloroquina/uso terapéutico , Proteínas Quinasas Activadas por AMP/metabolismo , Ataxia Telangiectasia/tratamiento farmacológico , Ataxia Telangiectasia/metabolismo , Ataxia Telangiectasia/patología , Ratones Noqueados para ApoE , Aterosclerosis/tratamiento farmacológico , Aterosclerosis/prevención & control , Transducción de Señal , Serina-Treonina Quinasas TOR/metabolismo , Apolipoproteínas E/metabolismo , Apolipoproteínas E/farmacología , Apolipoproteínas E/uso terapéutico , Ratones Endogámicos C57BL , Placa Aterosclerótica/tratamiento farmacológico , Placa Aterosclerótica/metabolismo , Placa Aterosclerótica/patología , Mamíferos/metabolismo
6.
Blood ; 142(17): 1494-1499, 2023 10 26.
Artículo en Inglés | MEDLINE | ID: mdl-37624915

RESUMEN

Here we report a new fusion gene, STRN3-RARA, in acute promyelocytic leukemia (APL). It cooperates with UTX deficiency to drive full-blown APL in mice. Although STRN3-RARA leukemia quickly relapses after all-trans retinoic acid treatment, it can be restrained by cepharanthine.


Asunto(s)
Leucemia Promielocítica Aguda , Animales , Ratones , Leucemia Promielocítica Aguda/tratamiento farmacológico , Leucemia Promielocítica Aguda/genética , Proteínas de Fusión Oncogénica/genética , Tretinoina/uso terapéutico
7.
Heliyon ; 9(7): e18305, 2023 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-37539322

RESUMEN

The gene expression networks of a single cell can be used to reveal cell type- and condition-specific patterns that account for cell states, cell identity, and its responses to environmental changes. We applied single cell sequencing datasets to define mRNA patterns and visualized potential cellular capacities among hepatocellular cancer cells. The expressing numbers and levels of genes were highly heterogenous among the cancer cells. The cellular characteristics were dependent strongly on the expressing numbers and levels of genes, especially oncogenes and anti-oncogenes, in an individual cancer cell. The transcriptional activations of oncogenes and anti-oncogenes were strongly linked to inherent multiple cellular programs, some of which oppose and contend against other processes, in a cancer cell. The gene expression networks of multiple cellular programs proliferation, differentiation, apoptosis, autophagy, epithelial-mesenchymal transition, ATP production, and neurogenesis coexisted in an individual cancer cell. The findings give rise a hypothesis that a cancer cell expresses balanced combinations of genes and undergoes a given biological process by rapidly transmuting gene expressing networks.

8.
Int J Biol Sci ; 19(10): 3226-3248, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37416774

RESUMEN

Loss of function in transport protein particles (TRAPP) links a new set of emerging genetic disorders called "TRAPPopathies". One such disorder is NIBP syndrome, characterized by microcephaly and intellectual disability, and caused by mutations of NIBP/TRAPPC9, a crucial and unique member of TRAPPII. To investigate the neural cellular/molecular mechanisms underlying microcephaly, we developed Nibp/Trappc9-deficient animal models using different techniques, including morpholino knockdown and CRISPR/Cas mutation in zebrafish and Cre/LoxP-mediated gene targeting in mice. Nibp/Trappc9 deficiency impaired the stability of the TRAPPII complex at actin filaments and microtubules of neurites and growth cones. This deficiency also impaired elongation and branching of neuronal dendrites and axons, without significant effects on neurite initiation or neural cell number/types in embryonic and adult brains. The positive correlation of TRAPPII stability and neurite elongation/branching suggests a potential role for TRAPPII in regulating neurite morphology. These results provide novel genetic/molecular evidence to define patients with a type of non-syndromic autosomal recessive intellectual disability and highlight the importance of developing therapeutic approaches targeting the TRAPPII complex to cure TRAPPopathies.


Asunto(s)
Discapacidad Intelectual , Microcefalia , Animales , Ratones , Discapacidad Intelectual/genética , Discapacidad Intelectual/metabolismo , Microcefalia/genética , Microcefalia/metabolismo , Neuritas/fisiología , Neuronas/metabolismo , Pez Cebra
9.
iScience ; 26(3): 106273, 2023 Mar 17.
Artículo en Inglés | MEDLINE | ID: mdl-36936789

RESUMEN

DOPEY2 has been shown to be associated with Down syndrome and PCDH7 might be involved in Rett syndrome and MECP2 duplication syndrome. The mechanism how both proteins play roles in these syndromes are largely unknown. Here, we show that Dopey2 and Pcdh7 balance the proliferation and differentiation of neural stem cells and progenitors during embryonic neurogenesis to generate proper size and architecture of zebrafish brains. Dopey2 and Pcdh7 mutually restricted expression of each other in zebrafish embryos. Dopey2 was responsible for the proliferation of neural stem cells/progenitors, whereas Pcdh7 was responsible for the differentiation of neural stem cells/progenitors. Both proteins were shown to orchestrate the proper development and arrangement of neural cells in zebrafish embryonic brains. The results provide an insight into mechanisms to understand how the embryonic brain is constituted and how developmental defects occur in the brains of patients with Down syndrome, Rett syndrome, or MECP2 duplication syndrome.

10.
Commun Biol ; 5(1): 1326, 2022 12 03.
Artículo en Inglés | MEDLINE | ID: mdl-36463319

RESUMEN

Fibroblasts and myofibroblasts are major mesenchymal cells in the lamina propria of colon mucosa and in colon cancer tissues. Detailed insight into the highly specific populations of fibroblasts and myofibroblasts is required to understand the integrity and homeostasis of human colon mucosa and colon cancer. Based on gene expression profiles of single cells, we identified fibroblast populations that produce extracellular matrix components, Wnt ligand- and BMP-secreting fibroblasts, chemokine- and chemokine ligand-generating fibroblasts, highly activated fibroblasts, immune-modulating fibroblasts, epithelial cell-modulating myofibroblasts, stimuli-responsive myofibroblasts, proliferating myofibroblasts, fibroblast-like myofibroblasts, matrix producing myofibroblasts, and contractile myofibroblasts in human colon mucosa. In colon cancer tissue, the compositions of fibroblasts and myofibroblasts were highly altered, as were the expressing patterns of genes including BMPs, Wnt ligands, chemokines, chemokine ligands, growth factors and extracellular matrix components in fibroblasts and myofibroblasts. Our work expands the working atlas of fibroblasts and myofibroblasts and provides a framework for interrogating the complexity of stromal cells in human healthy colon mucosa and colon cancer tissues.


Asunto(s)
Neoplasias del Colon , Fibroblastos , Humanos , Ligandos , Miofibroblastos , Neoplasias del Colon/genética
11.
J Clin Med ; 11(22)2022 Nov 11.
Artículo en Inglés | MEDLINE | ID: mdl-36431169

RESUMEN

Our aim was to investigate the association of glycated haemoglobin A1c (HbA1c) variability score (HVS) with estimated glomerular filtration rate (eGFR) slope in Chinese adults living with type 2 diabetes. This cohort study included adults with type 2 diabetes attending outpatient clinics between 2011 and 2019 from a large electronic medical record-based database of diabetes in China (WECODe). We estimated the individual-level visit-to-visit HbA1c variability using HVS, a proportion of changes in HbA1c of ≥0.5% (5.5 mmol/mol). We estimated the odds of people experiencing a rapid eGFR annual decline using a logistic regression and differences across HVS categories in the mean eGFR slope using a mixed-effect model. The analysis involved 2397 individuals and a median follow-up of 4.7 years. Compared with people with HVS ≤ 20%, those with HVS of 60% to 80% had 11% higher odds of experiencing rapid eGFR annual decline, with an extra eGFR decline of 0.93 mL/min/1.73 m2 per year on average; those with HVS > 80% showed 26% higher odds of experiencing a rapid eGFR annual decline, with an extra decline of 1.83 mL/min/1.73 m2 per year on average. Chinese adults with type 2 diabetes and HVS > 60% could experience a more rapid eGFR decline.

12.
Cancer Cell Int ; 22(1): 158, 2022 Apr 19.
Artículo en Inglés | MEDLINE | ID: mdl-35440048

RESUMEN

BACKGROUND: Several nervous and nerve-related biomarkers have been detected in colorectal cancer (CRC) and can contribute to the progression of CRC. However, the role of leucine-rich repeat neuronal 4 (LRRN4), a recently identified neurogenic marker, in CRC remains unclear. METHODS: We examined the expression and clinical outcomes of LRRN4 in CRC from TCGA-COREAD mRNA-sequencing datasets and immunohistochemistry in a Chinese cohort. Furthermore, colony formation, flow cytometry, wound healing assays and mouse xenograft models were used to investigate the biological significance of LRRN4 in CRC cell lines with LRRN4 knockdown or overexpression in vitro and in vivo. In addition, weighted coexpression network analysis, DAVID and western blot analysis were used to explore the potential molecular mechanism. RESULTS: We provide the first evidence that LRRN4 expression, at both the mRNA and protein levels, was remarkably high in CRC compared to controls and positively correlated with the clinical outcome of CRC patients. Specifically, LRRN4 was an independent prognostic factor for progression-free survival and overall survival in CRC patients. Further functional experiments showed that LRRN4 promoted cell proliferation, cell DNA synthesis and cell migration and inhibited apoptosis. Knockdown of LRRN4 can correspondingly decrease these effects in vitro and can significantly suppress the growth of xenografts. Several biological functions and signaling pathways were regulated by LRRN4, including proteoglycans in cancer, glutamatergic synapse, Ras, MAPK and PI3K. LRRN4 knockdown resulted in downregulation of Akt, p-Akt, ERK1/2 and p-ERK1/2, the downstream of the Ras/MAPK signaling pathway, overexpression of LRRN4 leaded to the upregulation of these proteins. CONCLUSIONS: Our results suggest that LRRN4 could be a biological and molecular determinant to stratify CRC patients into distinct risk categories, and mechanistically, this is likely attributable to LRRN4 regulating several malignant phenotypes of neoplastic cells via RAS/MAPK signal pathways.

13.
Sichuan Da Xue Xue Bao Yi Xue Ban ; 53(1): 127-132, 2022 Jan.
Artículo en Chino | MEDLINE | ID: mdl-35048612

RESUMEN

OBJECTIVE: To establish a 14-color flow cytometry protocol for the examination of leukocyte subsets in human peripheral blood. METHODS: We used cell membrane surface antibodies CD45, CD3, CD4, CD8, CD19, CD56, CD16, CD14, CD25, CD127, HLA-DR, CD123, CD11c and nucleus staining dye DAPI to establish a 14-color flow cytometry assay to determine the major cell subsets in human peripheral blood. We collected peripheral blood specimens from healthy volunteers to test for antibody titers and optimal photomultiplier tube (PMT) voltage, and to conduct single-color staining and fluorescence minus one control staining. After determining the test method and test conditions, the peripheral blood samples of 18 healthy volunteers were analyzed. RESULTS: According to the cell classification and staining index, optimal antibody mass concentrations selected were as follows: CD25 and CD127 at 8.0 µg/mL, CD45, CD3, CD14 and CD123 at 4.0 µg/mL, CD8, CD19, CD56, CD16, HLA-DR and CD11c at 2.0 µg/mL, CD4 at 1.0 µg/mL and DAPI at 0.1 µg/mL. The detection voltages for CD45, CD3, CD4, CD8, CD19, CD56, CD16, CD14, CD25, CD127, HLA-DR, CD123, CD11c and DAPI were 450 V, 410 V, 400 V, 550 V, 405 V, 500 V, 520 V, 550 V, 550 V, 400 V, 450 V, 400 V, 580 V, and 300 V, respectively. The appropriate fluorescence compensation was determined by single-color staining and fluorescence minus one controls. The 14-color flow cytometry panel was established to analyze the main subsets of leukocytes in human peripheral blood, and peripheral blood samples from 18 healthy adults were examined, obtaining the percentages of each subset of peripheral blood leukocytes and the immunophenotypes of the main subsets. CONCLUSION: We established a 14-color panel for determining leukocyte subsets in human peripheral blood by flow cytometry, which produced stable and reliable results and was easy to operate.


Asunto(s)
Leucocitos , Subgrupos Linfocitarios , Recuento de Células , Citometría de Flujo , Humanos , Inmunofenotipificación
14.
J Invest Dermatol ; 141(10): 2521-2529.e4, 2021 10.
Artículo en Inglés | MEDLINE | ID: mdl-33839145

RESUMEN

Keloid disease is a benign skin disease that does not have an effective therapy. More and more research shows that epidermal abnormalities are involved in keloid pathogenesis. Little is known about the relationship between the abnormal epidermal immunophenotype and clinical outcome. Nine-color flow cytometry with computational analysis was performed to detect the altered cellular subpopulation distribution in keloid lesions. Receiver operating characteristic curves were drawn to compare predictive ability between the alteration of cell subgroup frequency and the Vancouver Scar Scale. The frequency of CD49fhi/CD29+/TLR7+ cellular subsets increased in the keloid epidermis compared with that in the healthy control. CD49fmid-hi/CD29+/TLR7+/CD24+ cellular subpopulation level was increased significantly in keloids, whereas CD49flo-mid/CD29‒/TLR7‒/CD24‒ cellular subpopulation frequency was decreased. The CD49flo/CD29‒/TLR7‒/CD24+/CD117+ cellular subpopulation showed an increased frequency during recurrence with a sensitivity of 66.7% and specificity of 91.7%. The area under the curve was 0.806 for cellular subpopulation analysis, which was higher than the area under the curve for the Vancouver Scar Scale (0.583). The alteration of keloid epidermal subpopulation frequency is related to recurrence, which will provide an optional predictive marker for keloid recurrence and a potential target subset for investigating the generation of keloid.


Asunto(s)
Células Epidérmicas/patología , Citometría de Flujo/métodos , Queloide/patología , Células Epidérmicas/clasificación , Células Epidérmicas/inmunología , Femenino , Humanos , Inmunofenotipificación , Integrina alfa6/análisis , Integrina beta1/análisis , Queloide/inmunología , Masculino , Recurrencia , Receptor Toll-Like 7/análisis
15.
Biomed Eng Online ; 20(1): 22, 2021 Feb 17.
Artículo en Inglés | MEDLINE | ID: mdl-33596908

RESUMEN

BACKGROUND: The detection and dissection of epidermal subgroups could lead to an improved understanding of skin homeostasis and wound healing. Flow cytometric analysis provides an effective method to detect the surface markers of epidermal cells while producing high-dimensional data files. METHODS: A 9-color flow cytometric panel was optimized to reveal the heterogeneous subgroups in the epidermis of human skin. The subsets of epidermal cells were characterized using automated methods based on dimensional reduction approaches (viSNE) and clustering with Spanning-tree Progression Analysis of Density-normalized Events (SPADE). RESULTS: The manual analysis revealed differences in epidermal distribution between body sites based on a series biaxial gating starting with the expression of CD49f and CD29. The computational analysis divided the whole epidermal cell population into 25 clusters according to the surface marker phenotype with SPADE. This automatic analysis delineated the differences between body sites. The consistency of the results was confirmed with PhenoGraph. CONCLUSION: A multicolor flow cytometry panel with a streamlined computational analysis pipeline is a feasible approach to delineate the heterogeneity of the epidermis in human skin.


Asunto(s)
Epidermis/fisiología , Citometría de Flujo/métodos , Piel/citología , Algoritmos , Análisis por Conglomerados , Color , Simulación por Computador , Humanos , Aprendizaje Automático , Reconocimiento de Normas Patrones Automatizadas , Fenotipo , Programas Informáticos
16.
PLoS Biol ; 18(5): e3000746, 2020 05.
Artículo en Inglés | MEDLINE | ID: mdl-32453802

RESUMEN

Members of the Tre2-Bub2-Cdc16 (TBC) family often function to regulate membrane trafficking and to control signaling transductions pathways. As a member of the TBC family, TBC1D23 is critical for endosome-to-Golgi cargo trafficking by serving as a bridge between Golgi-bound golgin-97/245 and the WASH/FAM21 complex on endosomal vesicles. However, the exact mechanisms by which TBC1D23 regulates cargo transport are poorly understood. Here, we present the crystal structure of the N-terminus of TBC1D23 (D23N), which consists of both the TBC and rhodanese domains. We show that the rhodanese domain is unlikely to be an active sulfurtransferase or phosphatase, despite containing a putative catalytic site. Instead, it packs against the TBC domain and forms part of the platform to interact with golgin-97/245. Using the zebrafish model, we show that impacting golgin-97/245-binding, but not the putative catalytic site, impairs neuronal growth and brain development. Altogether, our studies provide structural and functional insights into an essential protein that is required for organelle-specific trafficking and brain development.


Asunto(s)
Autoantígenos/metabolismo , Encéfalo/embriología , Proteínas Activadoras de GTPasa/metabolismo , Proteínas de la Matriz de Golgi/metabolismo , Tiosulfato Azufretransferasa/metabolismo , Factores de Ribosilacion-ADP/metabolismo , Animales , Escherichia coli , Proteínas Activadoras de GTPasa/química , Proteínas Activadoras de GTPasa/aislamiento & purificación , Células HEK293 , Células HeLa , Humanos , Proteínas de la Membrana/metabolismo , Conformación Proteica , Dominios Proteicos , Pez Cebra
17.
Arch Rheumatol ; 35(4): 521-532, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-33758809

RESUMEN

OBJECTIVES: This study aims to evaluate the frequency and absolute number of circulating innate lymphoid cell (ILC) subsets and their associations with clinical and serological features in systemic lupus erythematosus (SLE). PATIENTS AND METHODS: We recruited 28 SLE patients (6 males, 22 females; mean age 37.57 years; range, 18 to 56 years) and 13 healthy controls (4 males, 9 females; mean age 32.08 years; range, 19 to 48 years). Circulating ILC subsets were identified by flow cytometry. Associations between all detected cells and SLE disease activity, clinical manifestations, and serum autoantibodies were analyzed. RESULTS: In this study, significantly higher frequencies of ILC2s and ILC3s, lower frequencies of ILC1s, and higher ILC1/ILC3 and ILC1/ILC2 ratios were observed in SLE patients than in healthy controls. The frequencies and number of ILC3s were positively associated with SLE disease activity index 2000 score and anti-double stranded deoxyribonucleic acid titers in patients with SLE. Decreased ILC1 frequencies, increased ILC3 frequencies, and decreased ILC1/ILC3 and ILC2/ILC3 ratios were observed in patients with arthritis compared to those without arthritis. CONCLUSION: Our results indicated biased altered distributions of circulating ILC subsets in SLE. ILC3s were associated with SLE disease activity, and ILC1s, ILC3s, and ILC1/ILC3 and ILC2/ILC3 ratios were associated with SLE accompanied with arthritis. Taken together, these results suggest that ILCs may serve as cellular biomarkers for disease activity and arthritis involvement in SLE.

18.
Proc Natl Acad Sci U S A ; 116(45): 22598-22608, 2019 11 05.
Artículo en Inglés | MEDLINE | ID: mdl-31624125

RESUMEN

Pontocerebellar hypoplasia (PCH) is a group of neurological disorders that affect the development of the brain, in particular, the pons and cerebellum. Homozygous mutations of TBC1D23 have been found recently to lead to PCH; however, the underlying molecular mechanisms remain unclear. Here, we show that the crystal structure of the TBC1D23 C-terminal domain adopts a Pleckstrin homology domain fold and selectively binds to phosphoinositides, in particular, PtdIns(4)P, through one surface while binding FAM21 via the opposite surface. Mutation of key residues of TBC1D23 or FAM21 selectively disrupts the endosomal vesicular trafficking toward the Trans-Golgi Network. Finally, using the zebrafish model, we show that PCH patient-derived mutants, impacting either phosphoinositide binding or FAM21 binding, lead to abnormal neuronal growth and brain development. Taken together, our data provide a molecular basis for the interaction between TBC1D23 and FAM21, and suggest a plausible role for PtdIns(4)P in the TBC1D23-mediating endosome-to-TGN trafficking pathway. Defects in this trafficking pathway are, at least partially, responsible for the pathogenesis of certain types of PCH.


Asunto(s)
Enfermedades Cerebelosas/metabolismo , Endosomas/metabolismo , Proteínas Activadoras de GTPasa/química , Proteínas Activadoras de GTPasa/metabolismo , Animales , Enfermedades Cerebelosas/genética , Endosomas/genética , Proteínas Activadoras de GTPasa/genética , Células HeLa , Humanos , Mutación , Proteínas de Unión a Fosfato/química , Proteínas de Unión a Fosfato/genética , Proteínas de Unión a Fosfato/metabolismo , Unión Proteica , Dominios Proteicos , Transporte de Proteínas , Pez Cebra , Red trans-Golgi/genética , Red trans-Golgi/metabolismo
19.
Life Sci ; 227: 114-121, 2019 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-30890406

RESUMEN

AIMS: Intraoperative blood salvage (IBS) is associated with shortened lifespan of red blood cells (RBCs). This study aims to examine how salvaged RBCs are compromised during IBS. MAIN METHODS: Thirty patients who underwent vertebra surgery with IBS were included in the study. To examine possible mechanisms of IBS-induced injury, both fresh and salvaged RBCs from each patient were mixed with plasma, the Ca2+ ionophore ionomycin or mannitol-adenine-phosphate (MAP) solution (n = 10 patients per condition). Binding of Fluo-3 and/or Annexin V by RBCs was measured. KEY FINDINGS: The percentage of Fluo-3-binding RBCs in salvaged samples was 2.83 ±â€¯0.76%, which increased to 15.34 ±â€¯5.99% after 48-h incubation in plasma. These percentages were significantly higher than those observed with fresh RBCs (P < 0.01). Ionomycin dose-dependently increased the percentage of Fluo-3-binding RBCs in salvaged samples, while MAP solution decreased it. Incubating salvaged RBCs in plasma for 48 h increased the percentage of Fluo-3-positive spherocytes from 0.8 ±â€¯0.6% to 11.35 ±â€¯3.96%, and this increase was blocked by MAP solution. Ionomycin increased the percentage of RBCs binding both Fluo-3 and Annexin V, while MAP decreased this percentage. The percentage of Annexin V-binding RBCs was also higher in salvaged samples than in fresh samples, but this percentage was unaffected by either ionomycin or MAP solution. SIGNIFICANCE: Our results suggest that IBS induces a postponed RBC damage by inducing spherocyte formation, which likely reflects Ca2+ entry induced by energy exhaustion, as well as by exposing phosphatidylserine on the RBC surface, which likely occurs via Ca2+ entry and via Ca2+-independent pathways.


Asunto(s)
Eritrocitos/efectos de los fármacos , Eritrocitos/fisiología , Recuperación de Sangre Operatoria/métodos , Adenina/farmacología , Adulto , Calcio/metabolismo , China , Femenino , Humanos , Masculino , Persona de Mediana Edad , Fosfatidilserinas/metabolismo , Estudios Prospectivos
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