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1.
Mol Biol Rep ; 50(11): 9073-9083, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37728820

RESUMO

BACKGROUND: Vascular calcification (VC) is a major predictor of cardiovascular diseases that represent the principal cause of mortality among type-2 diabetic patients. Accumulating data suggest the vital role of some microRNAs on vascular calcification as an epigenetic regulator. Thus, we assessed herein, the role of serum miR-433-3p in vascular calcification in type-2 diabetic patients. METHODS: Twenty healthy subjects (control group) and forty diabetic patients (20 without VC and 20 with VC) were involved in the study. miR-433-3p gene expression was measured. Runx2, Dickkopf-1 (DKK1), ß-catenin, Receptor activator of nuclear factor kappa-B ligand (RANKL), and osteoprotegerin (OPG) levels in serum were assessed by ELISA technique. RESULTS: Diabetes patients had significantly lower levels of miR-433-3p expression in comparison to the control group, with the lowest levels being found in diabetic patients with VC. Furthermore, Runx2, ß-catenin, and RANKL levels were significantly increased with concomitant lower DKK1 and OPG levels detected in the two diabetic groups especially those with VC. CONCLUSION: Collectively, the study documented that down-regulation of miR-433-3p may contribute to the development of VC through activating WNT/ß-Catenin and RANKL/RANK/OPG signaling pathways.


Assuntos
Diabetes Mellitus Tipo 2 , MicroRNAs , Calcificação Vascular , Humanos , Osteoprotegerina/genética , Osteoprotegerina/metabolismo , Subunidade alfa 1 de Fator de Ligação ao Core/genética , beta Catenina/genética , beta Catenina/metabolismo , Transdução de Sinais/genética , MicroRNAs/genética , MicroRNAs/metabolismo , Calcificação Vascular/genética , Calcificação Vascular/metabolismo , Diabetes Mellitus Tipo 2/complicações , Diabetes Mellitus Tipo 2/genética
2.
J Biochem Mol Toxicol ; 36(3): e22976, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-34939713

RESUMO

Vincristine is a chemotherapy drug that belongs to the vinca alkaloids group. It is used for treatment of hematologic malignancies and several solid tumors. Vincristine-induced peripheral neuropathy is a major dose-limiting side effect. Coenzyme Q10 (Co Q10), an essential component of the mitochondrial electron transport chain, participates in energy production. It is a powerful fat-soluble antioxidant and also exerts anti-inflammatory effects. Therefore, this study was aimed to focus on the mechanistic insights of vincristine-induced peripheral neuropathy in addition to shedding the light on the modulatory effect of Co Q10. Twenty-eight rats were randomly divided into four groups. Peripheral neuropathy was induced by intraperitoneal injection of vincristine (0.1 mg/kg body weight). Co Q10 was injected intraperitoneally (10 mg/kg body weight) for 24 days. Sciatic nerve MDA, TAC, GSH, 8-OHdG, TNF-α, IL-1ß, and NF-κB levels were assessed. Gene expression of SARM1 and Nrf2 was also assessed. Serum neurofilament light chain was immunoassayed, in addition to the behavioral assessment. Co Q10 significantly improved oxidative stress and inflammatory biomarkers. It also decreased serum NFL levels. It enhanced Nrf2 and decreased SARM1 gene expression. Histopathological findings proved the biochemical and molecular findings. Our results support Co Q10 as a potential protective agent against vincristine-induced peripheral neuropathy.


Assuntos
Estresse Oxidativo/efeitos dos fármacos , Doenças do Sistema Nervoso Periférico , Ubiquinona/análogos & derivados , Vincristina/efeitos adversos , Animais , Inflamação/induzido quimicamente , Inflamação/metabolismo , Inflamação/prevenção & controle , Doenças do Sistema Nervoso Periférico/induzido quimicamente , Doenças do Sistema Nervoso Periférico/metabolismo , Doenças do Sistema Nervoso Periférico/prevenção & controle , Ratos , Ratos Sprague-Dawley , Ubiquinona/farmacologia , Vincristina/farmacologia
3.
Proc Natl Acad Sci U S A ; 116(31): 15635-15644, 2019 07 30.
Artigo em Inglês | MEDLINE | ID: mdl-31300537

RESUMO

Colorectal cancer (CRC) is the third leading cause of cancer-related deaths worldwide. Several genome sequencing studies have provided comprehensive CRC genomic datasets. Likewise, in our previous study, we performed genome-wide Sleeping Beauty transposon-based mutagenesis screening in mice and provided comprehensive datasets of candidate CRC driver genes. However, functional validation for most candidate CRC driver genes, which were commonly identified from both human and mice, has not been performed. Here, we describe a platform for functionally validating CRC driver genes that utilizes CRISPR-Cas9 in mouse intestinal tumor organoids and human CRC-derived organoids in xenograft mouse models. We used genetically defined benign tumor-derived organoids carrying 2 frequent gene mutations (Apc and Kras mutations), which act in the early stage of CRC development, so that we could clearly evaluate the tumorigenic ability of the mutation in a single gene. These studies showed that Acvr1b, Acvr2a, and Arid2 could function as tumor suppressor genes (TSGs) in CRC and uncovered a role for Trp53 in tumor metastasis. We also showed that co-occurrent mutations in receptors for activin and transforming growth factor-ß (TGF-ß) synergistically promote tumorigenesis, and shed light on the role of activin receptors in CRC. This experimental system can also be applied to mouse intestinal organoids carrying other sensitizing mutations as well as organoids derived from other organs, which could further contribute to identification of novel cancer driver genes and new drug targets.


Assuntos
Sistemas CRISPR-Cas , Neoplasias Colorretais , Perfilação da Expressão Gênica , Técnicas de Inativação de Genes , Proteínas de Neoplasias , Organoides , Animais , Linhagem Celular Tumoral , Neoplasias Colorretais/genética , Neoplasias Colorretais/metabolismo , Neoplasias Colorretais/patologia , Humanos , Camundongos , Camundongos Endogâmicos NOD , Proteínas de Neoplasias/biossíntese , Proteínas de Neoplasias/genética , Organoides/metabolismo , Organoides/patologia
4.
Sensors (Basel) ; 22(16)2022 Aug 12.
Artigo em Inglês | MEDLINE | ID: mdl-36015808

RESUMO

Rust is a common disease in wheat that significantly impacts its growth and yield. Stem rust and leaf rust of wheat are difficult to distinguish, and manual detection is time-consuming. With the aim of improving this situation, this study proposes a method for identifying wheat rust based on ensemble learning (WR-EL). The WR-EL method extracts and integrates multiple convolutional neural network (CNN) models, namely VGG, ResNet 101, ResNet 152, DenseNet 169, and DenseNet 201, based on bagging, snapshot ensembling, and the stochastic gradient descent with warm restarts (SGDR) algorithm. The identification results of the WR-EL method were compared to those of five individual CNN models. The results show that the identification accuracy increases by 32%, 19%, 15%, 11%, and 8%. Additionally, we proposed the SGDR-S algorithm, which improved the f1 scores of healthy wheat, stem rust wheat and leaf rust wheat by 2%, 3% and 2% compared to the SGDR algorithm, respectively. This method can more accurately identify wheat rust disease and can be implemented as a timely prevention and control measure, which can not only prevent economic losses caused by the disease, but also improve the yield and quality of wheat.


Assuntos
Basidiomycota , Triticum , Aprendizado de Máquina , Doenças das Plantas
5.
Sensors (Basel) ; 22(3)2022 Jan 18.
Artigo em Inglês | MEDLINE | ID: mdl-35161449

RESUMO

In this paper, we presented a novel electrostatic Roll/Pitch MEMS gyroscope with in-plane drive mode and out-of-plane sense mode. The proposed structure is developed based on a tuning fork gyroscope with decoupled sense mass on each tine that control the sense out-of-plane frequency. A multi-height deep reactive ion etching (DRIE) fabrication process was utilized to achieve and enhance decoupling between the drive and sense modes. We presented our design methodology followed by an analytical and finite element (FEM) model. Our experimental results showed a good match between the analytical model and those obtained experimentally, from the drive and sense oscillation frequencies. Our characterization setup used a custom made application specific integrated circuit (ASIC) for characterization and was able to achieve ARW of 0.2 deg/rt-h, a bias instability 5.5 deg/h, and scale factor non-linearity (SFNL) 156 ppm FS.

7.
J Biol Chem ; 291(41): 21496-21509, 2016 Oct 07.
Artigo em Inglês | MEDLINE | ID: mdl-27519418

RESUMO

Although abnormal metabolic regulation is a critical determinant of cancer cell behavior, it is still unclear how an altered balance between ATP production and consumption contributes to malignancy. Here we show that disruption of this energy balance efficiently suppresses aggressive malignant gliomas driven by mammalian target of rapamycin complex 1 (mTORC1) hyperactivation. In a mouse glioma model, mTORC1 hyperactivation induced by conditional Tsc1 deletion increased numbers of glioma-initiating cells (GICs) in vitro and in vivo Metabolic analysis revealed that mTORC1 hyperactivation enhanced mitochondrial biogenesis, as evidenced by elevations in oxygen consumption rate and ATP production. Inhibition of mitochondrial ATP synthetase was more effective in repressing sphere formation by Tsc1-deficient glioma cells than that by Tsc1-competent glioma cells, indicating a crucial function for mitochondrial bioenergetic capacity in GIC expansion. To translate this observation into the development of novel therapeutics targeting malignant gliomas, we screened drug libraries for small molecule compounds showing greater efficacy in inhibiting the proliferation/survival of Tsc1-deficient cells compared with controls. We identified several compounds able to preferentially inhibit mitochondrial activity, dramatically reducing ATP levels and blocking glioma sphere formation. In human patient-derived glioma cells, nigericin, which reportedly suppresses cancer stem cell properties, induced AMPK phosphorylation that was associated with mTORC1 inactivation and induction of autophagy and led to a marked decrease in sphere formation with loss of GIC marker expression. Furthermore, malignant characteristics of human glioma cells were markedly suppressed by nigericin treatment in vivo Thus, targeting mTORC1-driven processes, particularly those involved in maintaining a cancer cell's energy balance, may be an effective therapeutic strategy for glioma patients.


Assuntos
Metabolismo Energético , Glioma/metabolismo , Glioma/terapia , ATPases Mitocondriais Próton-Translocadoras/metabolismo , Complexos Multiproteicos/metabolismo , Serina-Treonina Quinases TOR/metabolismo , Proteínas Supressoras de Tumor/metabolismo , Trifosfato de Adenosina/genética , Trifosfato de Adenosina/metabolismo , Animais , Glioma/genética , Humanos , Alvo Mecanístico do Complexo 1 de Rapamicina , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Knockout , Camundongos Nus , ATPases Mitocondriais Próton-Translocadoras/genética , Complexos Multiproteicos/genética , Serina-Treonina Quinases TOR/genética , Proteína 1 do Complexo Esclerose Tuberosa , Proteínas Supressoras de Tumor/genética
9.
J Orthod ; 43(1): 33-8, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26778242

RESUMO

OBJECTIVE: To test the applicability of the Tanaka and Johnston equation for prediction of the mesiodistal width of unerupted permanent teeth in a Sudanese population and to develop a new prediction equation for this specific population if necessary. DESIGN: A descriptive, cross-sectional study. SETTINGS: School-based study. SUBJECTS AND METHODS: Two hundred and fifty subjects (118 males and 132 females) age 13 - 19 years were randomly selected from two public secondary high schools in Khartoum State. Mesiodistal widths of the upper and lower permanent canines, first and second premolars (CPM) as well as the mandibular permanent incisors (MPI) were measured manually on the dental casts using a digital caliper. The predicted values of the mesiodistal widths were statistically compared with the respective actual sum of the canine and premolars of the same quadrant. RESULTS: Moderate correlation coefficients were found between the sum of the mesiodistal width of the MPI and the sum of the CPM in males (0.618 for mandibular arch and 0.626 for maxillary arch) and females (0.726 for mandibular arch and 0.680 for maxillary arch). A low coefficient of determination was recorded (0.45 and 0.48) in both jaws for combined genders. CONCLUSIONS: The Tanaka and Johnston equations overestimated the actual mesiodistal width of CPM in both arches for males and females. New prediction equations with more accurate regression parameters were proposed for the Sudanese population.


Assuntos
Dentição Mista , Odontometria , Dente não Erupcionado , Adolescente , Dente Pré-Molar , Estudos Transversais , Dente Canino , Feminino , Humanos , Incisivo , Masculino , Adulto Jovem
10.
J Neurooncol ; 121(2): 239-50, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25293440

RESUMO

The Notch signal regulates both cell viability and apoptosis, and maintains stemness of various cancers including glioblastoma (GBM). Although Notch signal inhibition may be an effective strategy in treating GBM initiating cells (GICs), its applicability to the different subtypes of GBM remains unclear. Here, we analyzed the effectiveness of MRK003, a preclinical γ-secretase inhibitor, on GICs. Nine patient-derived GICs were treated by MRK003, and its efficacy on cell viability, apoptosis, sphere forming ability and Akt expression level which might be related to Notch downstream and be greatly important signals in GBM was evaluated. MRK003 suppressed viability and sphere-formation ability, and induced apoptosis in all GICs in varying doses of MRK003. Based on their sensitivities to MRK003, the nine GICs were divided into "relatively sensitive" and "relatively resistant" GICs. Sensitivity to MRK003 was associated with its inhibitory effect on Akt pathway. Transgenic expression of the myristoylated Akt vector in relatively sensitive GICs partially rescued the effect of MRK003, suggesting that the effect of MRK003 was, at least in part, mediated through inhibition of the Akt pathway. These GICs were differentiated by the expression of CD44 and CD133 with flow cytometric analysis. The relatively sensitive GICs are CD44-high and CD133-low. The IC50 of MRK003 in a set of GICs exhibited a negative correlation with CD44 and positive correlation with CD133. Collectively, MRK003 is partially mediated by the Akt pathway and has strong therapeutic potential for CD44-high and CD133-low GICs.


Assuntos
Antígenos CD/metabolismo , Antineoplásicos/farmacologia , Óxidos S-Cíclicos/farmacologia , Glioblastoma/tratamento farmacológico , Glicoproteínas/metabolismo , Receptores de Hialuronatos/metabolismo , Células-Tronco Neoplásicas/efeitos dos fármacos , Peptídeos/metabolismo , Tiadiazóis/farmacologia , Antígeno AC133 , Secretases da Proteína Precursora do Amiloide/antagonistas & inibidores , Secretases da Proteína Precursora do Amiloide/metabolismo , Apoptose/efeitos dos fármacos , Apoptose/fisiologia , Biomarcadores Tumorais/metabolismo , Sobrevivência Celular/efeitos dos fármacos , Sobrevivência Celular/fisiologia , Relação Dose-Resposta a Droga , Glioblastoma/fisiopatologia , Humanos , Concentração Inibidora 50 , Células-Tronco Neoplásicas/fisiologia , Inibidores de Proteases/farmacologia , Esferoides Celulares/efeitos dos fármacos , Esferoides Celulares/fisiologia , Células Tumorais Cultivadas
11.
Biochem Biophys Res Commun ; 450(1): 837-43, 2014 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-24960197

RESUMO

Acute myeloid leukaemia (AML) is a heterogeneous neoplastic disorder in which a subset of cells function as leukaemia-initiating cells (LICs). In this study, we prospectively evaluated the leukaemia-initiating capacity of AML cells fractionated according to the expression of a nucleolar GTP binding protein, nucleostemin (NS). To monitor NS expression in living AML cells, we generated a mouse AML model in which green fluorescent protein (GFP) is expressed under the control of a region of the NS promoter (NS-GFP). In AML cells, NS-GFP levels were correlated with endogenous NS mRNA. AML cells with the highest expression of NS-GFP were very immature blast-like cells, efficiently formed leukaemia colonies in vitro, and exhibited the highest leukaemia-initiating capacity in vivo. Gene expression profiling analysis revealed that cell cycle regulators and nucleotide metabolism-related genes were highly enriched in a gene set associated with leukaemia-initiating capacity that we termed the 'leukaemia stem cell gene signature'. This gene signature stratified human AML patients into distinct clusters that reflected prognosis, demonstrating that the mouse leukaemia stem cell gene signature is significantly associated with the malignant properties of human AML. Further analyses of gene regulation in leukaemia stem cells could provide novel insights into diagnostic and therapeutic approaches to AML.


Assuntos
Proteínas de Ligação ao GTP/genética , Predisposição Genética para Doença/genética , Leucemia Mieloide Aguda/genética , Leucemia Mieloide Aguda/patologia , Células-Tronco Neoplásicas/metabolismo , Células-Tronco Neoplásicas/patologia , Proteínas Nucleares/genética , Regiões Promotoras Genéticas/genética , Animais , Transformação Celular Neoplásica/metabolismo , Transformação Celular Neoplásica/patologia , Marcadores Genéticos/genética , Humanos , Camundongos , Camundongos Transgênicos , Prognóstico
12.
Am J Pathol ; 183(2): 592-603, 2013 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-23885716

RESUMO

Nucleostemin (NS) is a nucleolar GTP-binding protein that is involved in ribosomal biogenesis and protection of telomeres. We investigated the expression of NS in human germ cell tumors and its function in a mouse germ cell tumor model. NS was abundantly expressed in undifferentiated, but not differentiated, types of human testicular germ cell tumors. NS was expressed concomitantly with OCT3/4, a critical regulator of the undifferentiated status of pluripotent stem cells in primordial germ cells and embryonal carcinomas. To investigate the roles of NS in tumor growth in vivo, we used a mouse teratoma model. Analysis of teratomas derived from embryonic stem cells in which the NS promoter drives GFP expression showed that cells highly expressing NS were actively proliferating and exhibited the characteristics of tumor-initiating cells, including the ability to initiate and propagate tumor cells in vivo. NS-expressing cells exhibited higher levels of GTP than non-NS-expressing cells. Because NS protein is stabilized by intracellular GTP, metabolic changes may contribute to abundant NS expression in the undifferentiated cells. OCT3/4 deficiency in teratomas led to loss of NS expression, resulting in growth retardation. Finally, we found that teratomas deficient in NS lost their undifferentiated characteristics, resulting in defective tumor proliferation. These data indicate that abundant expression of NS supports the undifferentiated properties of germ cell tumors.


Assuntos
Proteínas de Transporte/metabolismo , Proteínas Nucleares/metabolismo , Teratoma/metabolismo , Neoplasias Testiculares/metabolismo , Animais , Proliferação de Células , Modelos Animais de Doenças , Proteínas de Ligação ao GTP , Células Germinativas/patologia , Humanos , Masculino , Camundongos , Camundongos Transgênicos , Proteínas de Ligação a RNA , Teratoma/patologia , Neoplasias Testiculares/patologia , Células Tumorais Cultivadas
13.
Environ Sci Pollut Res Int ; 31(29): 42277-42294, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38865046

RESUMO

Intercropping is a sustainable strategy recognized for boosting crop production and mitigating heavy metal toxicity in contaminated soils. This study investigates the effects of biochar amendments on Pb-contaminated soil, utilizing monocropping and intercropping techniques with C. olitorius and Z. mays. The research assesses Pb removal capacity, nutrient uptake, antioxidant enzymes, and soil Pb fractionation. In monocropping, the phytoremediation ratio for C. olitorius increased from 16.67 to 27.33%, while in intercropping, it rose from 19.00 to 28.33% with biochar amendments. Similarly, Z. mays exhibited an increased phytoremediation ratio from 53.33 to 74.67% in monocropping and from 63.00 to 78.67% in intercropping with biochar amendments. Intercropping significantly increased the peroxidase (POD) activity in Z. mays roots by 22.53%, and there were notable increases in shoot POD of C. olitorius (11.54%) and Z. mays (16.20%) with biochar application. CAT showed consistent improvements, increasing by 37.52% in C. olitorius roots and 74.49% in Z. mays roots with biochar. Biochar amendments significantly increased N content in soil under sole cropping of Z. mays and intercropping systems. In contrast, Cu content increased by 56.34%, 59.05%, and 79.80% in monocropping (C. olitorius and Z. mays) and intercropping systems, respectively. This suggests that biochar enhances nutrient availability, improving phytoremediation efficacy in Pb-contaminated soil. Phyto availability of trace metals (Zn, Mn, Cu, and Fe) exhibited higher levels with biochar amendments than those without. The findings indicate that intercropping and biochar amendments elevate antioxidant enzyme levels, reducing reactive oxygen species and mitigating Pb toxicity effects. This approach improves phytoremediation efficiency and holds promise for soil pollution remediation while enhancing nutrient content and crop quality in Pb-contaminated soil.


Assuntos
Biodegradação Ambiental , Carvão Vegetal , Corchorus , Chumbo , Poluentes do Solo , Solo , Zea mays , Carvão Vegetal/química , Solo/química , Metais Pesados
14.
Bone Marrow Transplant ; 59(5): 615-624, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38347187

RESUMO

Allogeneic hematopoietic cell transplantation (allo-HCT) offers a curative option for patients with certain non-malignant hematological diseases. High-dose post-transplant cyclophosphamide (PT-Cy) (200 mg/kg) and sirolimus (3 mg/kg), (HiC) synergistically induce stable mixed chimerism. Further, sirolimus and cytotoxic T lymphocyte-associated antigen-4 immunoglobulin (CTLA4-Ig), also known as Abatacept (Aba), promote immune tolerance and allograft survival. Here, in a major histocompatibility complex (MHC)-mismatched allo-HCT murine model, we combined Aba and/or T-cell depleting anti-Thy1.2 (Thy) with a lower dose of PT-Cy (50 mg/kg) and Sirolimus (3 mg/kg), (LoC). While mice in the LoC group showed graft rejection, the addition of Thy to LoC induced similar donor chimerism levels when compared to the HiC group. However, the addition of Aba to LoC led to graft acceptance only in younger mice. When Thy was added to the LoC+Aba setting, graft acceptance was restored in both age groups. Engrafted groups displayed significantly reduced frequencies of recipient-specific interferon-γ-producing T cells as well as an increased frequency in regulatory T cells (Tregs) except in the LoC+Aba group. Splenocytes from engrafted mice showed no proliferation upon restimulation with Balb/c stimulators. Collectively, in combination with Aba or Thy, LoC may be considered to reduce graft rejection in patients who undergo allo-HCT.


Assuntos
Abatacepte , Ciclofosfamida , Depleção Linfocítica , Sirolimo , Animais , Ciclofosfamida/farmacologia , Sirolimo/farmacologia , Camundongos , Abatacepte/farmacologia , Abatacepte/uso terapêutico , Transplante de Células-Tronco Hematopoéticas/métodos , Camundongos Endogâmicos BALB C , Quimeras de Transplante , Transplante Homólogo/métodos , Aloenxertos
15.
Obes Surg ; 34(3): 911-927, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38191966

RESUMO

PURPOSE: Roux-en-Y gastric bypass (RYGB) leads to the improvement of many obesity-associated conditions. The degree to which post-operative macronutrient composition contributes to metabolic improvement after RYGB is understudied. METHODS: A mouse model of RYGB was used to examine the effects of diet on the post-operative outcomes of RYGB. Obese mice underwent either Sham or RYGB surgery and were administered either chow or HFD and then monitored for an additional 8 weeks. RESULTS: After RYGB, reductions to body weight, fat mass, and lean mass were similar regardless of diet. RYGB and HFD were independently detrimental to bone mineral density and plasma vitamin D levels. Independent of surgery, HFD accelerated hematopoietic stem and progenitor cell proliferation and differentiation and exhibited greater myeloid lineage commitment. Independent of diet, systemic iron deficiency was present after RYGB. In both Sham and RYGB groups, HFD increased energy expenditure. RYGB increased fecal energy loss, and HFD after RYGB increased fecal lipid content. RYGB lowered fasting glucose and liver glycogen levels but HFD had an opposing effect. Indices of insulin sensitivity improved independent of diet. HFD impaired improvements to dyslipidemia, NAFLD, and fibrosis. CONCLUSION: Post-operative diet plays a significant role in determining the degree to which RYGB reverses obesity-induced metabolic abnormalities such as hyperglycemia, dyslipidemia, and NAFLD. Diet composition may be targeted in order to assist in the treatment of post-RYGB bone mineral density loss and vitamin D deficiency as well as to reverse myeloid lineage commitment. HFD after RYGB continues to pose a significant multidimensional health risk.


Assuntos
Dislipidemias , Derivação Gástrica , Hepatopatia Gordurosa não Alcoólica , Obesidade Mórbida , Camundongos , Animais , Derivação Gástrica/métodos , Obesidade Mórbida/cirurgia , Obesidade/cirurgia , Obesidade/metabolismo , Dieta Hiperlipídica
16.
bioRxiv ; 2024 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-38895335

RESUMO

Hematopoietic stem cells (HSCs) with multilineage potential are critical for effective T cell reconstitution and restoration of the adaptive immune system after allogeneic Hematopoietic Cell Transplantation (allo-HCT). The Kit lo subset of HSCs is enriched for multipotential precursors, 1, 2 but their T-cell lineage potential has not been well-characterized. We therefore studied the thymic reconstituting and T-cell potential of Kit lo HSCs. Using a preclinical allo-HCT model, we demonstrate that Kit lo HSCs support better thymic recovery, and T-cell reconstitution resulting in improved T cell responses to infection post-HCT. Furthermore, Kit lo HSCs with augmented BM lymphopoiesis mitigate age-associated thymic alterations, thus enhancing T-cell recovery in middle-aged hosts. We find the frequency of the Kit lo subset declines with age, providing one explanation for the reduced frequency of T-competent HSCs and reduced T-lymphopoietic potential in BM precursors of aged mice. 3, 4, 5 Chromatin profiling revealed that Kit lo HSCs exhibit higher activity of lymphoid-specifying transcription factors (TFs), including Zbtb1 . Deletion of Zbtb1 in Kit lo HSCs diminished their T-cell potential, while reinstating Zbtb1 in megakaryocytic-biased Kit hi HSCs rescued T-cell potential, in vitro and in vivo . Finally, we discover an analogous Kit lo HSC subset with enhanced lymphoid potential in human bone marrow. Our results demonstrate that Kit lo HSCs with enhanced lymphoid potential have a distinct underlying epigenetic program.

17.
FASEB J ; 26(6): 2457-70, 2012 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22415302

RESUMO

Vitiligo is characterized by a progressive loss of inherited skin color. The cause of the disease is still unknown. To date, there is accumulating in vivo and in vitro evidence for massive oxidative stress via hydrogen peroxide (H(2)O(2)) and peroxynitrite (ONOO(-)) in the skin of affected individuals. Autoimmune etiology is the favored theory. Since depletion of the essential amino acid L-tryptophan (Trp) affects immune response mechanisms, we here looked at epidermal Trp metabolism via tryptophan hydroxylase (TPH) with its downstream cascade, including serotonin and melatonin. Our in situ immunofluorescence and Western blot data reveal significantly lower TPH1 expression in patients with vitiligo. Expression is also low in melanocytes and keratinocytes under in vitro conditions. Although in vivo Fourier transform-Raman spectroscopy proves the presence of 5-hydroxytryptophan, epidermal TPH activity is completely absent. Regulation of TPH via microphthalmia-associated transcription factor and L-type calcium channels is severely affected. Moreover, dopa decarboxylase (DDC) expression is significantly lower, in association with decreased serotonin and melatonin levels. Computer simulation supports H(2)O(2)/ONOO(-)-mediated oxidation/nitration of TPH1 and DDC, affecting, in turn, enzyme functionality. Taken together, our data point to depletion of epidermal Trp by Fenton chemistry and exclude melatonin as a relevant contributor to epidermal redox balance and immune response in vitiligo.


Assuntos
Dopa Descarboxilase/metabolismo , Epiderme/metabolismo , Peróxido de Hidrogênio/metabolismo , Melatonina/metabolismo , Ácido Peroxinitroso/metabolismo , Serotonina/metabolismo , Triptofano Hidroxilase/metabolismo , Triptofano/metabolismo , Vitiligo/metabolismo , Adulto , Canais de Cálcio Tipo L/metabolismo , Células Cultivadas , Humanos , Pessoa de Meia-Idade , Oxirredução , Espécies Reativas de Oxigênio/metabolismo , Triptofano/química , Vitiligo/imunologia
18.
FASEB J ; 26(6): 2471-85, 2012 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22415306

RESUMO

Vitiligo is characterized by a mostly progressive loss of the inherited skin color. The cause of the disease is still unknown, despite accumulating in vivo and in vitro evidence of massive oxidative stress via hydrogen peroxide (H(2)O(2)) and peroxynitrite (ONOO(-)) in the skin of affected individuals. The most favored hypothesis is based on autoimmune mechanisms. Since depletion of the essential amino acid L-tryptophan (Trp) severely affects various immune responses, we here looked at Trp metabolism and signaling in these patients. Our in vivo and in vitro data revealed total absence of epidermal Trp hydroxylase activities and the presence of H(2)O(2)/ONOO(-) deactivated indoleamine 2,3-dioxygenase. Aryl hydrocarbon receptor signaling is severely impaired despite the ligand (Trp dimer) being formed, as shown by mass spectrometry. Loss of this signal is supported by the absence of downstream signals (COX-2 and CYP1A1) as well as regulatory T-lymphocytes and by computer modeling. In vivo Fourier transform Raman spectroscopy confirmed the presence of Trp metabolites together with H(2)O(2) supporting deprivation of the epidermal Trp pool by Fenton chemistry. Taken together, our data support a long-expressed role for in loco redox balance and a distinct immune response. These insights could open novel treatment strategies for this disease.


Assuntos
Epiderme/metabolismo , Indolamina-Pirrol 2,3,-Dioxigenase/antagonistas & inibidores , Receptores de Hidrocarboneto Arílico/metabolismo , Vitiligo/metabolismo , Simulação por Computador , Humanos , Peróxido de Hidrogênio/metabolismo , Indolamina-Pirrol 2,3,-Dioxigenase/metabolismo , Estresse Oxidativo , Ácido Peroxinitroso/metabolismo , Receptores de Hidrocarboneto Arílico/efeitos dos fármacos , Transdução de Sinais , Linfócitos T Reguladores/imunologia , Linfócitos T Reguladores/metabolismo , Triptofano/metabolismo , Vitiligo/imunologia
19.
Rev Esp Anestesiol Reanim (Engl Ed) ; 70(10): 596-601, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37678456

RESUMO

Pain following thoracotomy incisions, particularly involving multiple rib resections, can be devastating. We report our experience using erector spinae plane block with catheter placement for perioperative pain management in a 16 year old patient with Ewing sarcoma. The patient required major thoracic surgery involving resection of the 7th, 8th, 9th and 10th ribs and part of the diaphragm to remove the tumour, followed by mesh reconstruction. Ultrasound guided erector spinae plane block is a simple technique that can provide excellent static and dynamic pain control following major thoracic surgery in adolescents.


Assuntos
Analgesia , Bloqueio Nervoso , Cirurgia Torácica , Humanos , Adolescente , Bloqueio Nervoso/métodos , Dor Pós-Operatória/prevenção & controle , Analgesia/métodos , Costelas/cirurgia
20.
Polymers (Basel) ; 15(15)2023 Aug 04.
Artigo em Inglês | MEDLINE | ID: mdl-37571205

RESUMO

Pulsed electric field (PEF) as a green processing technology is drawing greater attention due to its eco-friendliness and potential to promote sustainable development goals. In this study, the effects of different electric field strengths (EFS, 0-30 kV/cm) on the structure and physicochemical features of casein micelles (CSMs) were investigated. It was found that the particle sizes of CSMs increased at low EFS (10 kV/cm) but decreased at high EFS (30 kV/cm). The absolute ζ-potential at 30 kV/cm increased from -26.6 (native CSMs) to -29.5 mV. Moreover, it was noticed that PEF treatment leads to changes in the surface hydrophobicity; it slightly increased at low EFS (10 kV/cm) but decreased at EFS > 10 kV/cm. PEF enhanced the protein solubility from 84.9 (native CSMs) to 87.1% (at 10 kV/cm). PEF at low EFS (10 kV/cm) intensified the emission fluorescence spectrum of CSMs, while higher EFS reduced the fluorescence intensity compared to native CSMs. Moreover, the analysis of the Amide Ι region showed that PEF-treated CSMs reduced the α-helix and increased the ß-sheet content. Raman spectra confirmed that PEF treatment > 10 kV/cm buried tyrosine (Tyr) residues in a hydrophobic environment. It was also found that PEF treatment mainly induced changes in the disulfide linkages. In conclusion, PEF technology can be employed as an eco-friendly technology to change the structure and physiochemical properties of CSMs; this could improve their techno-functional properties.

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