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1.
Biomed Eng Online ; 23(1): 62, 2024 Jun 25.
Artigo em Inglês | MEDLINE | ID: mdl-38918766

RESUMO

Diabetic retinopathy (DR) is an eye disease that causes blindness and vision loss in diabetic. Risk factors for DR include high blood glucose levels and some environmental factors. The pathogenesis is based on inflammation caused by interferon and other nuclear proteins. This review article provides an overview of DR and discusses the role of nuclear proteins in the pathogenesis of the disease. Some core proteins such as MAPK, transcription co-factors, transcription co-activators, and others are part of this review. In addition, some current advanced treatment resulting from the role of nuclear proteins will be analyzes, including epigenetic modifications, the use of methylation, acetylation, and histone modifications. Stem cell technology and the use of nanobiotechnology are proposed as promising approaches for a more effective treatment of DR.


Assuntos
Retinopatia Diabética , Proteínas Nucleares , Retinopatia Diabética/metabolismo , Humanos , Proteínas Nucleares/metabolismo , Animais , Epigênese Genética
2.
Mol Carcinog ; 62(5): 652-664, 2023 05.
Artigo em Inglês | MEDLINE | ID: mdl-36752346

RESUMO

Hydrogen sulfide (H2 S) has been widely recognized as one of gasotransmitters. Endogenous H2 S plays a crucial role in the progression of cancer. However, the effect of endogenous H2 S on the development of nasopharyngeal carcinoma (NPC) is still unknown. In this study, aminooxyacetic acid (AOAA, an inhibitor of cystathionine-ß-synthase), dl-propargylglycine (PAG, an inhibitor of cystathionine-γ-lyase), and l-aspartic acid (l-Asp, an inhibitor of 3-mercaptopyruvate sulfurtransferase) were adopted to detect the role of endogenous H2 S in NPC growth. The results indicated that the combine (PAG + AOAA + l-Asp) group had higher inhibitory effect on the growth of NPC cells than the PAG, AOAA, and l-Asp groups. There were similar trends in the levels of apoptosis and reactive oxygen species (ROS). In addition, the combine group exhibited lower levels of phospho (p)-extracellular signal-regulated protein kinase but higher expressions of p-p38 and p-c-Jun N-terminal kinase than those in the AOAA, PAG, and l-Asp groups. Furthermore, the combine group exerted more potent inhibitory effect on NPC xenograft tumor growth without obvious toxicity. In summary, suppression of endogenous H2 S generation could dramatically inhibit NPC growth via the ROS/mitogen-activated protein kinase pathway. Endogenous H2 S may be a novel therapeutic target in human NPC cells. Effective inhibitors for H2 S-producing enzymes could be designed and developed for NPC treatment.


Assuntos
Sulfeto de Hidrogênio , Neoplasias Nasofaríngeas , Humanos , Sulfeto de Hidrogênio/farmacologia , Sulfeto de Hidrogênio/metabolismo , Cistationina , Carcinoma Nasofaríngeo , Espécies Reativas de Oxigênio , Sulfetos/farmacologia , Neoplasias Nasofaríngeas/tratamento farmacológico
3.
J Am Chem Soc ; 144(33): 15193-15202, 2022 Aug 24.
Artigo em Inglês | MEDLINE | ID: mdl-35926139

RESUMO

Data carriers using spin waves in spintronic and magnonic logic devices offer operation at low power consumption and free of Joule heating yet requiring noncollinear spin structures of small sizes. Heterometallic rings can provide such an opportunity due to the controlled spin-wave transmission within such a confined space. Here, we present a series of {ScnGdn} (n = 4, 6, 8) heterometallic rings, which are the first Sc-Ln clusters to date, with tunable magnetic interactions for spin-wave excitations. By means of time- and temperature-dependent spin dynamics simulations, we are able to predict distinct spin-wave excitations at finite temperatures for Sc4Gd4, Sc6Gd6, and Sc8Gd8. Such a new model is previously unexploited, especially due to the interplay of antiferromagnetic exchange, dipole-dipole interaction, and ring topology at low temperatures, rendering the importance of the latter to spin-wave excitations.

4.
Hepatology ; 74(4): 2118-2132, 2021 10.
Artigo em Inglês | MEDLINE | ID: mdl-33999437

RESUMO

BACKGROUND AND AIMS: Liver ischemia reperfusion injury (IRI) remains an unresolved clinical problem. This study dissected roles of liver-resident macrophage Kupffer cells (KCs), with a functional focus on efferocytosis receptor T-cell immunoglobulin and mucin domain-containing protein-4 (TIM-4), in both the activation and resolution of IRI in a murine liver partial warm ischemia model. APPROACH AND RESULTS: Fluorescence-activated cell sorting results showed that TIM-4 was expressed exclusively by KCs, but not infiltrating macrophages (iMФs), in IR livers. Anti-TIM-4 antibody depleted TIM-4+ macrophages in vivo, resulting in either alleviation or deterioration of liver IRI, which was determined by the repopulation kinetics of the KC niche with CD11b+ macrophages. To determine the KC-specific function of TIM-4, we reconstituted clodronate-liposome-treated mice with exogenous wild-type or TIM-4-deficient KCs at either 0 hour or 24 hours postreperfusion. TIM-4 deficiency in KCs resulted in not only increases in the severity of liver IRI (at 6 hours postreperfusion), but also impairment of the inflammation resolution (at 7 days postreperfusion). In vitro analysis revealed that TIM-4 promoted KC efferocytosis to regulate their Toll-like receptor response by up-regulating IL-10 and down-regulating TNF-α productions. CONCLUSIONS: TIM-4 is critical for KC homeostatic function in both the activation and resolution of liver IRI by efferocytosis.


Assuntos
Interleucina-10/metabolismo , Células de Kupffer/fisiologia , Hepatopatias/imunologia , Proteínas de Membrana/metabolismo , Traumatismo por Reperfusão/imunologia , Receptores Toll-Like/metabolismo , Fator de Necrose Tumoral alfa/metabolismo , Animais , Homeostase/fisiologia , Inflamação/metabolismo , Camundongos , Transdução de Sinais
5.
Inorg Chem ; 61(1): 227-235, 2022 Jan 10.
Artigo em Inglês | MEDLINE | ID: mdl-34939782

RESUMO

The hexagonal-bipyramidal lanthanide(III) complex [Dy(OtBu)Cl(18-C-6)][BPh4] (1; 18-C-6 = 1,4,7,10,13,16-hexaoxacyclooctadecane ether) displays an energy barrier for magnetization reversal (Ueff) of ca. 1000 K in a zero direct-current field. Temperature-dependent X-ray diffraction studies of 1 down to 30 K reveal bending of the Cl-Ln-OtBu angle at low temperature. Using ab initio calculations, we show that significant bending of the O-Dy-Cl angle upon cooling from 273 to 100 K leads to a ca. 10% decrease in the energy of the excited electronic states. A thorough exploration of the temperature and field dependencies of the magnetic relaxation rate reveals that magnetic relaxation is dictated by five mechanisms in different regimes: Orbach, Raman-I, quantum tunnelling of magnetization, and Raman-II, in addition to the observation of a phonon bottleneck effect.

6.
J Immunol ; 205(4): 1147-1156, 2020 08 15.
Artigo em Inglês | MEDLINE | ID: mdl-32680958

RESUMO

Glycogen synthase kinase 3 (Gsk3) α and ß are both constitutively active and inhibited upon stimulation by N-terminal serine phosphorylation. Although roles of active Gsk3 in liver ischemia reperfusion injury (IRI) have been well appreciated, whether Gsk3 N-terminal serine phosphorylation has any functional significance in the disease process remains unclear. In a murine liver partial warm ischemia model, we studied Gsk3 N-terminal serine mutant knock-in (KI) mice and showed that liver IRI was decreased in Gsk3αS21A but increased in Gsk3ßS9A mutant KI mice. Bone marrow chimeric experiments revealed that the Gsk3α, but not ß, mutation in liver parenchyma protected from IRI, and both mutations in bone marrow-derived cells exacerbated liver injuries. Mechanistically, mutant Gsk3α protected hepatocytes from inflammatory (TNF-α) cell death by the activation of HIV-1 TAT-interactive protein 60 (TIP60)-mediated autophagy pathway. The pharmacological inhibition of TIP60 or autophagy diminished the protection of the Gsk3α mutant hepatocytes from inflammatory cell death in vitro and the Gsk3α mutant KI mice from liver IRI in vivo. Thus, Gsk3 N-terminal serine phosphorylation inhibits liver innate immune activation but suppresses hepatocyte autophagy in response to inflammation. Gsk3 αS21, but not ßS9, mutation is sufficient to sustain Gsk4 activities in hepatocytes and protect livers from IRI via TIP60 activation.


Assuntos
Quinase 3 da Glicogênio Sintase/metabolismo , Hepatopatias/metabolismo , Fígado/metabolismo , Fosforilação/fisiologia , Isoformas de Proteínas/metabolismo , Traumatismo por Reperfusão/metabolismo , Serina/metabolismo , Animais , Autofagia/genética , Autofagia/fisiologia , Morte Celular/genética , Morte Celular/fisiologia , Quinase 3 da Glicogênio Sintase/genética , Hepatócitos/metabolismo , Imunidade Inata/genética , Imunidade Inata/fisiologia , Inflamação/genética , Inflamação/metabolismo , Hepatopatias/genética , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Mutação/genética , Fosforilação/genética , Isoformas de Proteínas/genética , Traumatismo por Reperfusão/genética , Serina/genética
7.
Int J Mol Sci ; 23(23)2022 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-36499387

RESUMO

Both aldosterone and arginine vasopressin (AVP) are produced in the heart and may participate in cardiac fibrosis. However, their relationship remains unknown. This study aims to demonstrate the regulation and role of AVP in aldosterone synthesis in the heart. Rats were subjected to a sham operation or myocardial infarction (MI) by ligating the coronary artery. Cardiac function and fibrosis were assessed using echocardiography and immunohistochemical staining, respectively. In addition, the effects of AVP stimulation on cardiac microvascular endothelial cells (CMECs) were studied using ELISA, real-time PCR, and Western blotting. Compared with the rats having undergone a sham operation, the MI rats had an increased LVMI, type I collagen composition, and concentrations of aldosterone and AVP in the heart but decreased cardiac function. As the MI rats aged, the LVMI, type I collagen, aldosterone, and AVP increased, while the LVMI decreased. Furthermore, AVP time-dependently induced aldosterone secretion and CYP11B2 mRNA expression in CMECs. The p-CREB levels were significantly increased by AVP. Nevertheless, these effects were completely blocked by SR49059 or partially inhibited by KN93. This study demonstrated that AVP could induce the secretion of local cardiac aldosterone, which may involve CaMK and CREB phosphorylation and CYP11B2 upregulation through V1 receptor activation.


Assuntos
Arginina Vasopressina , Infarto do Miocárdio , Ratos , Animais , Arginina Vasopressina/farmacologia , Arginina Vasopressina/metabolismo , Colágeno Tipo I , Células Endoteliais/metabolismo , Coração , Aldosterona/metabolismo , Fibrose
8.
Entropy (Basel) ; 24(6)2022 Jun 17.
Artigo em Inglês | MEDLINE | ID: mdl-35741557

RESUMO

Belavkin-Staszewski relative entropy can naturally characterize the effects of the possible noncommutativity of quantum states. In this paper, two new conditional entropy terms and four new mutual information terms are first defined by replacing quantum relative entropy with Belavkin-Staszewski relative entropy. Next, their basic properties are investigated, especially in classical-quantum settings. In particular, we show the weak concavity of the Belavkin-Staszewski conditional entropy and obtain the chain rule for the Belavkin-Staszewski mutual information. Finally, the subadditivity of the Belavkin-Staszewski relative entropy is established, i.e., the Belavkin-Staszewski relative entropy of a joint system is less than the sum of that of its corresponding subsystems with the help of some multiplicative and additive factors. Meanwhile, we also provide a certain subadditivity of the geometric Rényi relative entropy.

9.
Angew Chem Int Ed Engl ; 61(26): e202206022, 2022 Jun 27.
Artigo em Inglês | MEDLINE | ID: mdl-35543224

RESUMO

The fast Raman relaxation process via a virtual energy level has become a puzzle for how to chemically engineer single-molecule magnets (SMMs) with better performance. Here, we use the trifluoromethyl group to systematically substitute the methyl groups in the axial position of the parent bis-butoxide pentapyridyl dysprosium(III) SMM. The resulting complexes-[Dy(OLA )2 py5 ][BPh4 ] (LA =CH(CF3 )2 - 1, CH2 CF3 - 2, CMe2 CF3 - 3)-show progressively enhanced TB hys (@100 Oe s-1 ) from 17 K (for 3), 20 K (for 2) to 23 K (for 1). By experimentally identifying the varied under barrier relaxation energy in the 5-500 cm-1 regime, we are able to identify that the C-F bond related vibration energy of the axial ligand ranging from 200 to 350 cm-1 is the key variant for this improvement. Thus, this finding not only reveals a correlation between the structure and the Raman process but also provides a paradigm for how to apply the vibronic barrier model to analyze multi-phonon relaxation processes in lanthanide SMMs.

10.
Angew Chem Int Ed Engl ; 61(29): e202203285, 2022 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-35426226

RESUMO

A family of fully sandwiched arachno-lanthanacarborane complexes formulated as {η6 -[µ-1,2-[o-C6 H4 (CH2 )2 ]-1,2-C2 B10 H10 ]2 Ln}{Li5 (THF)10 } (Ln=Tb, Dy, Ho, Er, Y) is successfully synthesized, where the "carbons-adjacent" carboranyl ligand (arachno-R2 -C2 B10 H10 4- ) bears four negative charges and coordinates to the central lanthanide ions using the hexagonal η6 C2 B4 face. Thus, the central lanthanide cations are pseudo-twelve-coordinate and have an approximate pseudo-D6h symmetry or hexagonal-prismatic geometry. As the crystal field effect imparted by this geometry is still unknown, we thoroughly investigated the magnetic properties of this series of complexes and found that the crystal field imposed by this ligand causes a relation of Tb>Dy>Ho>Er for the energy gaps between the ground and the first excited states, which is of striking resemblance to the ferrocenophane and phthalocyanine ligands although the latter two ligands give disparate local coordination geometries. Moreover, the effective energy barrier to magnetization reversal of 445(10) K, the observable hysteresis loop up to 4 K and the relaxation time of the yttrium-diluted sample reaching 193(17) seconds at 2 K under an optimized field for the Tb analogue of this family of arachno-lanthanacarborane complexes, render a new benchmark for Tb3+ -based single-molecule magnets.

11.
Chemistry ; 27(8): 2623-2627, 2021 Feb 05.
Artigo em Inglês | MEDLINE | ID: mdl-32996640

RESUMO

Three six-coordinate DyIII single-molecule magnets (SMMs) [Dy(Ot Bu)2 (L)4 ]+ with local D4h symmetry are obtained by optimizing the equatorial ligands. One of the compounds with L=4-phenylpyridine shows an energy barrier (Ueff ) of 2075(11) K, which is the third largest Ueff , and the first Ueff >2000 K for SMMs with axial-type symmetry so far. Ab initio analysis indicates that the exceptional uniaxial magnetic anisotropy is deeply related to the axially compressed octahedral geometry. This work provides a new insight into the local D4h symmetry for high-performance SMMs.

12.
Inorg Chem ; 60(3): 1344-1351, 2021 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-33423464

RESUMO

Systematic substituent variations on amidinate ligands bring delicate changes of CrN4 coordination in a family of chromium(II) complexes with the common formula of Cr(RNC(CH3)NR)2, where R = iPr (1), Cy (2), Dipp (Dipp = 2, 6-diisopropylphenyl) (3), and tBu (4). With the largest substituent group, 4 shows the largest distortion of the N4 coordination geometry from square-planar to seesaw shape, which leads to its field-induced single-molecule magnet (SMM) behavior. This is an indication that 4 has the strongest axial magnetic anisotropy and/or optimized magnetic relaxation process. Combined with high-frequency/field electron paramagnetic resonance (HF-EPR) experiments and ab initio calculations, we deduce that the smallest energy gap between ground 4Ψ0 and the first excited 4Ψ1 orbitals in 4 contributes the most to its strongest magnetic anisotropy. Moreover, the lower E value of 4 ensures its being a field-induced SMM. Specifically, the D and E values were found to be correlated to the dihedral angle between the ΔN1CrN2 and ΔN3CrN4 triangles, indicating that distortion from ideal square-planar geometry to the seesaw help increase axial magnetic anisotropy and suppress the transversal part. Thus, the study on this system not only expands the family of Cr(II)-based SMMs but also contributes to a deeper understanding of magneto-structural correlation in four-coordinate Cr(II) SMMs.

13.
Chemistry ; 26(26): 5893-5902, 2020 May 07.
Artigo em Inglês | MEDLINE | ID: mdl-32073707

RESUMO

Although the development of single-molecule magnets (SMMs) is rapid, there are only two families of high energy barrier (Ueff ) dysprosium(III) SMMs known so far: the cyclopentadienyl (Cp) family with a sandwich structure and the pentagonal-bipyramidal (PB) family with D5h symmetry. These high-barrier SMMs, which usually possess Ueff >500 cm-1 allow the separate study of the four magnetic relaxation paths, namely, direct, quantum tunnelling, Raman and Orbach processes, in detail. Whereas the first family is chemically more challenging to modify the Cp rings, it is shown herein that the latter family, with the common formulae [DyX1 X2 (Leq )5 ]+ , such as X1 /X2 =- OCMe3 , - OSiMe3 , - OPh, Cl- or Br- ; Leq =THF/pyridine/4-methylpyridine, can be readily fine-tuned with a range of axial and equatorial ligands by simple substitution reactions. This allows unambiguous confirmation that the Ueff mainly depends on the identity of X1 and X2 , rather than on Leq . More importantly, the fitted parameters are barrier dependent. If X1 is an O donor and X2 is a halide, 500

14.
Mol Pharm ; 17(10): 3857-3869, 2020 10 05.
Artigo em Inglês | MEDLINE | ID: mdl-32833457

RESUMO

Disulfiram (DSF) is an FDA-approved anti-alcoholic drug that has recently proven to be effective in cancer treatment. However, the short half-life in the bloodstream and the metal ion-dependent antitumor activity significantly limited the further application of DSF in the clinical field. To this end, we constructed a silk fibroin modified disulfiram/zinc oxide nanocomposites (SF/DSF@ZnO) to solubilize and stabilize DSF, and, more importantly, achieve pH triggered Zn2+ release and subsequent synergistic antitumor activity. The prepared SF/DSF@ZnO nanocomposites were spherical and had a high drug loading. Triggered by the lysosomal pH, SF/DSF@ZnO could induce the rapid release of Zn2+ under the acidic conditions and caused nanoparticulate disassembly along with DSF release. In vitro experiments showed that cytotoxicity of DSF could be enhanced by the presence of Zn2+, and further amplified when encapsulated into SF/DSF@ZnO nanocomposites. It was confirmed that the significantly amplified cytotoxicity of SF/DSF@ZnO was resulted from pH-triggered Zn2+ release, inhibited cell migration, and increased ROS production. In vivo study showed that SF/DSF@ZnO nanocomposites significantly increased the tumor accumulation and prolonged the retention time. In vivo antitumor experiments in the xenograft model showed that SF/DSF@ZnO exerted the highest tumor-inhibition rate among all the drug treatments. Therefore, this exquisite study established silk fibroin-modified disulfiram/zinc oxide nanocomposites, SF/DSF@ZnO, where ZnO not only acted as a delivery carrier but also served as a metal ion reservoir to achieve synergistic antitumor efficacy. The established DSF nanoformulation displayed excellent therapeutic potential in future cancer treatment.


Assuntos
Antineoplásicos/farmacocinética , Nanocompostos/administração & dosagem , Neoplasias/tratamento farmacológico , Zinco/farmacocinética , Animais , Antineoplásicos/administração & dosagem , Antineoplásicos/química , Bombyx/química , Cátions Bivalentes/farmacocinética , Linhagem Celular Tumoral/transplante , Modelos Animais de Doenças , Dissulfiram/administração & dosagem , Dissulfiram/química , Dissulfiram/farmacocinética , Composição de Medicamentos/métodos , Liberação Controlada de Fármacos , Ensaios de Seleção de Medicamentos Antitumorais , Sinergismo Farmacológico , Feminino , Fibroínas/química , Meia-Vida , Humanos , Concentração de Íons de Hidrogênio , Camundongos , Neoplasias/patologia , Óxido de Zinco/administração & dosagem , Óxido de Zinco/química , Óxido de Zinco/farmacocinética
15.
Inorg Chem ; 59(11): 7371-7375, 2020 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-32392411

RESUMO

Here we report stable p-quinone-radical-bridged rare-earth complexes involving the ligand tetramethylquinone (QMe4•-). The complexes, {Y[(QMe4)•-Cl2(THF)3]}2 (1) and {Gd[(QMe4)•-Cl2(THF)3]}2 (2), where THF = tetrahydrofuran, are sufficiently stable that we can measure the single-crystal structures and perform magnetic and electron paramagnetic resonance measurements. These studies show the presence of a semiquinone form and that the magnetic interaction between the radicals in the dimer is strong and antiferromagnetic.

16.
Angew Chem Int Ed Engl ; 59(24): 9350-9354, 2020 Jun 08.
Artigo em Inglês | MEDLINE | ID: mdl-32090421

RESUMO

The dicarbollide ion, nido-C2 B9 H11 2- is isoelectronic with cyclopentadienyl. Herein, we make dysprosiacarboranes, namely [(C2 B9 H11 )2 Ln(THF)2 ][Na(THF)5 ] (Ln=Dy, 1Dy) and [(THF)3 (µ-H)3 Li]2 [{η5 -C6 H4 (CH2 )2 C2 B9 H9 }Dy{η2 :η5 -C6 H4 (CH2 )2 C2 B9 H9 }2 Li] 3Dy and show that dicarbollide ligands impose strong magnetic axiality on the central DyIII ion. The effective energy barrier (Ueff ) for the loss of magnetization can be varied by the substitution pattern on the dicarbollide. This finding is demonstrated by comparing complexes of nido-C2 B9 H11 2- and nido-[o-xylylene-C2 B9 H9 ]2- , which show a Ueff of 430(5) K and 804(7) K, respectively. The blocking temperature defined by the open hysteresis temperature of 3Dy reaches 6.8 K. Moreover, the linear complex [Dy(C2 B9 H11 )2 ]- is predicted to have comparable properties with the linear [Dy(CpMe3 )2 ]+ complex. As such, carboranyl ligands and their derivatives may provide a new type of organometallic ligand for high-performance single-molecule magnets.

17.
Chemistry ; 25(71): 16219-16224, 2019 Dec 18.
Artigo em Inglês | MEDLINE | ID: mdl-31642548

RESUMO

Eight-coordinated DyIII centres with D6h symmetry are expected to act as high-performance single-molecule magnets (SMMs) due to the simultaneous fulfilment of magnetic axiality and a high coordination number (a requisite for air stability). But the experimental realization is challenging due to the requirement of six coordinating atoms in the equatorial plane of the hexagonal bipyramid; this is usually too crowded for the central DyIII ion. Here a hexaaza macrocyclic Schiff base ligand and finetuned axial alkoxide/phenol-type ligands are used to show that a family of hexagonal bipyramidal DyIII complexes can be isolated. Among them, three complexes possess nearly perfect D6h local symmetry. The highest effective magnetic reversal barrier is found at 1338(3) K and an open hysteresis temperature of 6 K at the field sweeping rate of 1.2 mT s-1 ; this represents a new record for D6h SMMs.

18.
J Immunol ; 198(9): 3588-3595, 2017 05 01.
Artigo em Inglês | MEDLINE | ID: mdl-28289160

RESUMO

Although mechanisms of immune activation against liver ischemia reperfusion (IR) injury (IRI) have been studied extensively, questions regarding liver-resident macrophages, that is, Kupffer cells (KCs), remain controversial. Recent progress in the biology of tissue-resident macrophages implicates homeostatic functions of KCs. This study aims to dissect responses and functions of KCs in liver IRI. In a murine liver partial warm ischemia model, we analyzed liver-resident versus infiltrating macrophages by FACS and immunofluorescence staining. Our data showed that liver immune activation by IR was associated with not only infiltrations/activations of peripheral macrophages, but also necrotic depletion of KCs. Inhibition of receptor-interacting protein 1 (RIP1) by necrostatin-1s protected KCs from ischemia-induced depletion, resulting in the reduction of macrophage infiltration, suppression of proinflammatory immune activation, and protection of livers from IRI. The depletion of KCs by clodronate liposomes abrogated the effect of necrostatin-1s. Additionally, liver reconstitutions with KCs postischemia exerted anti-inflammatory/cytoprotective effects against IRI. These results reveal a unique response of KCs against liver IR, that is, RIP1-dependent necrosis, which constitutes a novel mechanism of liver inflammatory immune activation in the pathogenesis of liver IRI.


Assuntos
Proteínas Ativadoras de GTPase/metabolismo , Inflamação/imunologia , Células de Kupffer/imunologia , Fígado/patologia , Traumatismo por Reperfusão/imunologia , Animais , Células Cultivadas , Ácido Clodrônico/farmacologia , Modelos Animais de Doenças , Proteínas Ativadoras de GTPase/antagonistas & inibidores , Humanos , Imidazóis/farmacologia , Imunidade , Indóis/farmacologia , Células de Kupffer/efeitos dos fármacos , Células de Kupffer/patologia , Fígado/imunologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Necrose , Transdução de Sinais
19.
J Hepatol ; 69(1): 99-109, 2018 07.
Artigo em Inglês | MEDLINE | ID: mdl-29452207

RESUMO

BACKGROUND & AIMS: Glycogen synthase kinase 3ß (Gsk3ß [Gsk3b]) is a ubiquitously expressed kinase with distinctive functions in different types of cells. Although its roles in regulating innate immune activation and ischaemia and reperfusion injuries (IRIs) have been well documented, the underlying mechanisms remain ambiguous, in part because of the lack of cell-specific tools in vivo. METHODS: We created a myeloid-specific Gsk3b knockout (KO) strain to study the function of Gsk3ß in macrophages in a murine liver partial warm ischaemia model. RESULTS: Compared with controls, myeloid Gsk3b KO mice were protected from IRI, with diminished proinflammatory but enhanced anti-inflammatory immune responses in livers. In bone marrow-derived macrophages, Gsk3ß deficiency resulted in an early reduction of Tnf gene transcription but sustained increase of Il10 gene transcription on Toll-like receptor 4 stimulation in vitro. These effects were associated with enhanced AMP-activated protein kinase (AMPK) activation, which led to an accelerated and higher level of induction of the novel innate immune negative regulator small heterodimer partner (SHP [Nr0b2]). The regulatory function of Gsk3ß on AMPK activation and SHP induction was confirmed in wild-type bone marrow-derived macrophages with a Gsk3 inhibitor. Furthermore, we found that this immune regulatory mechanism was independent of Gsk3ß Ser9 phosphorylation and the phosphoinositide 3-kinase-Akt signalling pathway. In vivo, myeloid Gsk3ß deficiency facilitated SHP upregulation by ischaemia-reperfusion in liver macrophages. Treatment of Gsk3b KO mice with either AMPK inhibitor or SHP small interfering RNA before the onset of liver ischaemia restored liver proinflammatory immune activation and IRI in these otherwise protected hosts. Additionally, pharmacological activation of AMPK protected wild-type mice from liver IRI, with reduced proinflammatory immune activation. Inhibition of the AMPK-SHP pathway by liver ischaemia was demonstrated in tumour resection patients. CONCLUSIONS: Gsk3ß promotes innate proinflammatory immune activation by restraining AMPK activation. LAY SUMMARY: Glycogen synthase kinase 3ß promotes macrophage inflammatory activation by inhibiting the immune regulatory signalling of AMP-activated protein kinase and the induction of small heterodimer partner. Therefore, therapeutic targeting of glycogen synthase kinase 3ß enhances innate immune regulation and protects liver from ischaemia and reperfusion injury.


Assuntos
Proteínas Quinases Ativadas por AMP/metabolismo , Regulação da Expressão Gênica , Glicogênio Sintase Quinase 3 beta/genética , Imunidade Inata , Ativação de Macrófagos/imunologia , Macrófagos/metabolismo , Traumatismo por Reperfusão/imunologia , Animais , Western Blotting , Células Cultivadas , Modelos Animais de Doenças , Ensaio de Imunoadsorção Enzimática , Glicogênio Sintase Quinase 3 beta/biossíntese , Células de Kupffer/metabolismo , Fígado/irrigação sanguínea , Fígado/metabolismo , Fígado/patologia , Macrófagos/patologia , Masculino , Camundongos , Camundongos Knockout , RNA/genética , Traumatismo por Reperfusão/genética , Traumatismo por Reperfusão/patologia , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Transdução de Sinais
20.
J BUON ; 22(2): 495-499, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28534375

RESUMO

PURPOSE: To analyze the effect of the combination treatment of high-intensity focused ultrasound (HIFU) and cryocare knife in advanced liver cancer. METHODS: 74 patients with advanced liver cancer were divided into the observation group (40 cases) and the control group (34 cases). Patients in the control group were treated with simple transcatheter arterial chemoembolization (TACE), while those in the observation group were given the combination treatment of HIFU and cryocare knife. Therapeutic effects were compared. RESULTS: The total effective rate of the observation group was significantly higher than that of the control group (p<0.05). After treatment, both groups showed decreased level of AFP and increased level of ALT. Besides, the observation group had significantly lower levels of AFP and ALT than the control group (p<0.05). Comparison of albumin levels before and after treatment revealed no difference between groups. After treatment, both groups showed increased percents of CD3+ and CD4+ T lymphocytes and natural killer (NK) cells with the observation group having obviously higher percents than the control group (p<0.05). After treatment, CD8+ T lymphocyte of the observation group reduced, while that of the control group increased (p<0.05). After treatment, both groups showed decreased levels of hyaluronic acid (HA), laminin (LN), collagen (IV-C) an III procollagen (PCIII), and the levels of the observation group were obviously lower than those of the control group (p<0.05). Both groups were followed with a median follow-up time of 25.0 months. The observation group had significantly more prolonged median survival time, decreased reccurrence rate and improved survival rate (p<0.05). CONCLUSION: The combination treatment of HIFU and cryocare knife can improve the short and long-term treatment outcome of advanced liver cancer.


Assuntos
Neoplasias Hepáticas/tratamento farmacológico , Neoplasias Hepáticas/terapia , Idoso , Linfócitos T CD4-Positivos/efeitos dos fármacos , Linfócitos T CD8-Positivos/efeitos dos fármacos , Quimioembolização Terapêutica/métodos , Terapia Combinada/métodos , Feminino , Humanos , Células Matadoras Naturais/efeitos dos fármacos , Fígado , Neoplasias Hepáticas/mortalidade , Masculino , Pessoa de Meia-Idade , Taxa de Sobrevida , Ultrassonografia/métodos
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