RESUMO
The effects of sex and pregnancy on the bioaccumulation and tissue distribution of legacy and emerging per- and polyfluoroalkyl substances (PFASs) in Chinese water snakes were investigated. The bioaccumulation factor of PFASs showed a positive correlation with their protein-water partition coefficients (log KPW), and steric hindrance effects were observed when the molecular volume was > 357 Å3. PFAS levels in females were significantly lower than those in males. The chemical composition of pregnant females was significantly different from that of non-pregnant females and males. The maternal transfer efficiencies of perfluorooctane sulfonic acid were higher than those of other PFASs, and a positive correlation between the maternal transfer potential and log KPW was observed for other PFASs. Tissues with high phospholipid content exhibited higher concentrations of ∑PFASs. Numerous physiological changes occurred in maternal organ systems during pregnancy, leading to the re-distribution of chemicals among different tissues. The change in tissue distribution of PFASs that are easily and not-so-easily maternally transferred was in the opposite direction. The extent of compound transfer from the liver to the egg determined tissue re-distribution during pregnancy.
Assuntos
Ácidos Alcanossulfônicos , Fluorocarbonos , Poluentes Químicos da Água , Feminino , Gravidez , Humanos , Bioacumulação , Distribuição Tecidual , Poluentes Químicos da Água/análise , Água , Fluorocarbonos/análise , ChinaRESUMO
Persistent organic pollutants pose a great threat to amphibian populations, but information on the bioaccumulation of contaminants in amphibians remains scarce. To examine the tissue distribution and maternal transfer of organic halogenated pollutants (OHPs) in frogs, seven types of tissues from black-spotted frog (muscle, liver, kidney, stomach, intestine, heart, and egg) were collected from an e-waste-polluted area in South China. Among the seven frog tissues, median total OHP concentrations of 2.3 to 9.7 µg/g lipid weight were found (in 31 polychlorinated biphenyl [PCB] individuals and 15 polybrominated diphenyl ether [PBDE], dechlorane plus [syn-DP and anti-DP], bexabromobenzene [HBB], polybrominated biphenyl] PBB153 and -209], and decabromodiphenyl ethane [DBDPE] individuals). Sex-specific differences in contaminant concentration and compound compositions were observed among the frog tissues, and eggs had a significantly higher contaminant burden on the whole body of female frogs. In addition, a significant sex difference in the concentration ratios of other tissues to the liver was observed in most tissues except for muscle. These results suggest that egg production may involve the mobilization of other maternal tissues besides muscle, which resulted in the sex-specific distribution. Different parental tissues had similar maternal transfer mechanisms; factors other than lipophilicity (e.g., molecular size and proteinophilic characteristics) could influence the maternal transfer of OHPs in frogs. Environ Toxicol Chem 2024;43:1557-1568. © 2024 SETAC.
Assuntos
Poluentes Orgânicos Persistentes , Animais , Feminino , Distribuição Tecidual , Masculino , Poluentes Orgânicos Persistentes/metabolismo , Monitoramento Ambiental , Éteres Difenil Halogenados/metabolismo , Anuros/metabolismo , China , Ranidae/metabolismo , Poluentes Químicos da Água/metabolismo , Poluentes Químicos da Água/análiseRESUMO
Direct myocardial and vascular injuries due to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection-driven inflammation is the leading cause of acute cardiac injury associated with coronavirus disease 2019 (COVID-19). However, in-depth knowledge of the injury characteristics of the heart affected by inflammation is lacking. In this study, using a quantitative spatial proteomics strategy that combines comparative anatomy, laser-capture microdissection, and histological examination, we establish a region-resolved proteome map of the myocardia and microvessels with obvious inflammatory cells from hearts of patients with COVID-19. A series of molecular dysfunctions of myocardia and microvessels is observed in different cardiac regions. The myocardia and microvessels of the left atrial are the most susceptible to virus infection and inflammatory storm, suggesting more attention should be paid to the lesion and treatment of these two parts. These results can guide in improving clinical treatments for cardiovascular diseases associated with COVID-19.
Assuntos
COVID-19 , Traumatismos Cardíacos , COVID-19/complicações , Humanos , Inflamação , Proteoma , SARS-CoV-2RESUMO
To treat bone defects, tissue-engineering methods combine an appropriate scaffold with cells and osteogenic signals to stimulate bone repair. Mesenchymal stem cells (MSCs) derived from adult bone marrow are an ideal source of cells for tissue engineering, in particular for applications in skeletal and hard tissue repair. Core binding factor alpha1 (Cbfa1) is an essential transcription factor for osteoblast differentiation. However, the effects of Cbfa1 on MSCs in vitro and in vivo have not been well characterized. In this study, we found that MSCs modified genetically to express Cbfa1 promoted the healing of segmental defects of the radius in rabbits. First, osteogenic differentiation of MSCs transfected with an adenovirus encoding Cbfa1 was demonstrated. Expression of mRNA from a number of osteoblastic marker genes, including osteocalcin, osteopontin, and type I collagen, was detected. In addition, alkaline phosphatase activity and increased osteocalcin content were observed. The cells expressing the Cbfa1 gene were then combined with acellular bone extracellular matrix in a flow perfusion culture system. Finally, the cell-matrix constructs were implanted into radius defects in the rabbit model. After 12 weeks, radiographic, histological, and biomechanical analyses showed that MSCs modified with the Cbfa1 gene resulted in a significantly higher amount of newly-formed bone and rebuilding of the marrow cavity than control cell-matrix constructs. This study indicates that MSCs modified with the Cbfa1 gene can act as suitable seed cells for the regeneration of bone defects.
Assuntos
Células da Medula Óssea/citologia , Regeneração Óssea , Subunidade alfa 1 de Fator de Ligação ao Core/genética , Matriz Extracelular/metabolismo , Células-Tronco Mesenquimais/metabolismo , Engenharia Tecidual/métodos , Adenoviridae/genética , Animais , Transplante Ósseo , Adesão Celular , Técnicas de Cultura de Células , Diferenciação Celular , Linhagem Celular , DNA Recombinante/genética , Expressão Gênica , Vetores Genéticos/genética , Teste de Materiais , Células-Tronco Mesenquimais/citologia , Osteogênese , Coelhos , Radiografia , Rádio (Anatomia)/anormalidades , Rádio (Anatomia)/diagnóstico por imagem , Rádio (Anatomia)/fisiopatologia , Rádio (Anatomia)/transplante , Suínos , TransfecçãoRESUMO
BACKGROUND: Carotid artery stenosis is a major risk factor for ischemic stroke. Although carotid angioplasty and stenting using an embolic protection device has been introduced as a less invasive carotid revascularization approach, in-stent restenosis limits its long-term efficacy and safety. The objective of this study was to test the anti-restenosis effects of local stent-mediated delivery of the A20 gene in a porcine carotid artery model. MATERIALS AND METHODS: The pCDNA3.1EHA20 was firmly attached onto stents that had been collagen coated and treated with N-succinimidyl-3-(2-pyridyldithiol)propionate solution and anti-DNA immunoglobulin fixation. Anti-restenosis effects of modified vs control (the bare-metal stent and pCDNA3.1 void vector) stents were assessed by Western blot and scanning electron microscopy, as well as by morphological and inflammatory reaction analyses. RESULTS: Stent-delivered A20 gene was locally expressed in porcine carotids in association with significantly greater extent of re-endothelialization at day 14 and of neointimal hyperplasia inhibition at 3 months than stenting without A20 gene expression. CONCLUSION: The A20-gene-eluting stent inhibits neointimal hyperplasia while promoting re-endothelialization and therefore constitutes a novel potential alternative to prevent restenosis while minimizing complications.
Assuntos
Reestenose Coronária/terapia , Modelos Animais de Doenças , Stents Farmacológicos , Animais , Reestenose Coronária/prevenção & controle , SuínosRESUMO
Burn injuries as well as skin damages are often associated with immune suppression and often cause multiple organ failures. The monolayer endothelium is vulnerable to injuries from circulating factors resulting from remote wounds. Endothelial cell activation and apoptosis can alter microvascular permeability and intensify organ damage. A20, as a physiological cytoprotective gene is essential for preventing spontaneous innate immune cell-mediated inflammation and tissue destruction. It is not known whether A20 has the function to protect endothelial cells from the effect of burns serum challenge on endothelial function in vitro. This study shows that A20 can express in endothelial cells after burns serum stimulation and inhibit endothelial cell activation and apoptosis induced by burns serum. These results suggest that A20 may be beneficial in limiting the response to burn injuries.
Assuntos
Queimaduras/metabolismo , Células Epiteliais/metabolismo , Proteínas/fisiologia , Dedos de Zinco/fisiologia , Animais , Apoptose/efeitos dos fármacos , Western Blotting , Queimaduras/patologia , Bovinos , Proteínas de Ligação a DNA , Selectina E/metabolismo , Células Epiteliais/patologia , Humanos , Molécula 1 de Adesão Intercelular/metabolismo , Peptídeos e Proteínas de Sinalização Intracelular , NF-kappa B/metabolismo , Proteínas Nucleares , Proteína 3 Induzida por Fator de Necrose Tumoral alfa , Fator de Necrose Tumoral alfa/antagonistas & inibidores , Veias Umbilicais/metabolismoRESUMO
In regions of a vessel that experience low shear stress and reversing flow patterns, early features in the pathogenesis of atherosclerosis include the accumulation of oxidized LDL (OxLDL) and adhesion of monocytes to endothelial cells (EC). Here we investigated the hypothesis that low shear stress (2 dyn/cm2) and OxLDL are synergistic for enhanced expression of vascular cell adhesion molecule (VCAM-1) and human aortic endothelial cell (HAEC)-monocyte adhesion. This study shows low shear stress can significantly reduce IkappaBalpha levels, activate NF-kappaB, increase the expression of VCAM-1 in HAEC and binding of monocytes. OxLDL itself cannot significantly increase the expression of VCAM-1 in HAEC and binding of monocytes, but through activation of NF-kappaB and degradation of IkappaBalpha induced by low shear stress it can significantly enhance VCAM-1 expression and monocyte adhesion, over that in unmodified LDL or control. These results suggest that low shear stress can regulate monocyte adhesion to oxidized lipid-induced endothelial cells via an IkappaBalpha-dependent pathway, and that low shear stress together with OxLDL may likely play an important role in atherogenesis.
Assuntos
Endotélio Vascular/fisiologia , Proteínas I-kappa B/fisiologia , Lipoproteínas LDL/farmacologia , Monócitos/fisiologia , Adesão Celular/efeitos dos fármacos , Células Cultivadas , Células Endoteliais/metabolismo , Células Endoteliais/fisiologia , Endotélio Vascular/efeitos dos fármacos , Endotélio Vascular/metabolismo , Humanos , Inibidor de NF-kappaB alfa , NF-kappa B/antagonistas & inibidores , Transdução de Sinais/fisiologia , Estresse Mecânico , Molécula 1 de Adesão de Célula Vascular/metabolismoRESUMO
Angiogenesis is a major obstacle for wound healing in patients with diabetic foot wounds. Mesenchymal stem cells (MSCs) have an important function in wound repair, and neurotrophin-3 (NT-3) can promote nerve regeneration and angiogenesis. We investigated the effect of NT-3 on accelerating wound healing in the diabetic foot by improving human bone marrow MSC (hMSC) activation. In vitro, NT-3 significantly promoted VEGF, NGF, and BDNF secretion in hMSCs. NT-3 improved activation of the hMSC conditioned medium, promoted human umbilical vein endothelial cell (HUVEC) proliferation and migration, and significantly improved the closure rate of HUVEC scratches. In addition, we produced nanofiber mesh biological tissue materials through the electrospinning technique using polylactic acid, mixed silk, and collagen. The hMSCs stimulated by NT-3 were implanted into the material. Compared with the control group, the NT-3-stimulated hMSCs in the biological tissue material significantly promoted angiogenesis in the feet of diabetic C57BL/6J mice and accelerated diabetic foot wound healing. These results suggest that NT-3 significantly promotes hMSC secretion of VEGF, NGF, and other vasoactive factors and that it accelerates wound healing by inducing angiogenesis through improved activation of vascular endothelial cells. The hMSCs stimulated by NT-3 can produce materials that accelerate wound healing in the diabetic foot and other ischemic ulcers.
Assuntos
Diabetes Mellitus Experimental/patologia , Diabetes Mellitus Experimental/terapia , Transplante de Células-Tronco Mesenquimais , Células-Tronco Mesenquimais/metabolismo , Neurotrofina 3/farmacologia , Comunicação Parácrina/efeitos dos fármacos , Cicatrização/efeitos dos fármacos , Adolescente , Adulto , Animais , Fator Neurotrófico Derivado do Encéfalo/metabolismo , Movimento Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Meios de Cultivo Condicionados/farmacologia , Pé Diabético/patologia , Células Endoteliais da Veia Umbilical Humana/citologia , Células Endoteliais da Veia Umbilical Humana/efeitos dos fármacos , Humanos , Masculino , Células-Tronco Mesenquimais/efeitos dos fármacos , Camundongos , Camundongos Endogâmicos C57BL , Fator de Crescimento Neural/metabolismo , Regeneração/efeitos dos fármacos , Fator A de Crescimento do Endotélio Vascular/metabolismo , Adulto JovemRESUMO
OBJECTIVE: To explore the kidney anatomic structure of banna minipig inbred-lines, and to provide data for kidney xenotransplantation. METHODS: The fresh and infused kidneys of banna minipig (including the vessel and the ureter) were checked by anatomic microscope and vernier caliper in original location and away body. The tissue structure was observed by HE stain. RESULTS: The structure of kidney of banna minipig inbred-lines (including the vessel and the ureter) are similar to that of human being. The fascia propria of kidney is divided into three layers including capsula fibrosa, capsula adipose and fascia renalis. The thickness of cortex renalis is (20.0 +/- 2.4) mm. The average diameter of renal artery is 5.1 mm and is similar to that of human being. All the kidneys of banna minipig inbred-lines have a single branch renal artery. The diameters of left and right ureters are 5.1 mm and 4.7 mm, respectively. CONCLUSION: The kidney of banna minipig inbred-lines is an ideal replacement of human kidney for xenotransplantation.