Complement Component C3 Loss leads to Locomotor Deficits and Altered Cerebellar Internal Granule Cell In Vitro Synaptic Protein Expression in C57BL/6 Mice

ABSTRACT We investigated the importance of the host complement system in the pathogenesis of disease mediated by the intramacrophage pathogenMycobacterium avium. Mycobacteria opsonized with complement are efficiently ingested by macrophages through various complement receptors. Furthermore, unlike other bacteria, mycobacteria can activate both the alternative and classical complement pathways in the absence of specific antibodies. Therefore, to examine the role of complement in the mycobacterial infection process in vivo, mice deficient in complement component C3 were infected with M. avium. Surprisingly, C3-deficient mice infected intravenously with M. avium displayed no difference in bacterial burden or granulomatous response compared to wild-type control mice. C3-sufficient mice and C3-deficient mice were equally susceptible to infection by M. avium regardless of the genotype at thebcg locus, a locus known to confer susceptibility to infection with intracellular pathogens. In vitro studies using mouse bone marrow-derived macrophages resulted in significant M. avium invasion of macrophages in the absence of C3; however, the kinetics of infection were delayed compared to complement-mediated invasion. The data indicate that complement does not play an essential role in mediating M. avium infections in the mouse and suggest either that other invasion mechanisms can compensate for the absence of complement-mediated entry or that complement is not a major mycobacterial opsonin in vivo.

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Thrombopoietin receptor agonist eltrombopag alleviates cognitive impairment via NRG1/ErbB4 signaling

10.21203/rs.3.rs-211612/v1 ◽

2021 ◽

Author(s):

jian wang ◽

leping liu ◽

xuebao wang ◽

he yu ◽

baihui chen ◽

...

Keyword(s):

Protein Expression ◽

Rat Model ◽

Receptor Agonist ◽

Synapse Formation ◽

Cognitive Impairments ◽

Sirtuin 1 ◽

Synaptic Protein ◽

Thrombopoietin Receptor ◽

Thrombopoietin Receptor Agonist

Abstract Background Patients with minimal hepatic encephalopathy (MHE) show mild cognitive impairments. Thrombopoietin (TPO) has been shown to be neuroprotective. This study aimed to explore the therapeutic effect of Thrombopoietin receptor agonist eltrombopag (ELT) on MHE and the involvement of NRG1 signaling using primary rat neurons and a MHE rat model. Methods We explored the effects of ELT stimulation on NRG1/ErbB4 signaling and synapse formation in the primary rat neurons. Furthermore, we explored the cerebral TPO expression level and the effect of TPO replacement therapy in an MHE rat model. Results The results showed that ELT stimulation activated NRG1/ErbB4 signaling and enhanced synaptic protein expression in the primary rat neurons via sirtuin 1. An anti-NRG1 antibody, ErbB4 inhibitor, or knockdown of NRG1 or ErbB4 could significantly abolish ELT-induced upregulation of synaptic protein expression in the primary rat neurons. MHE rats had significantly decreased cerebral ELT expression compared with normal rats. ELT activated NRG1/ErbB4 signaling in MHE rat brains. Administration or overexpression of ELT or TPO promoted synapse formation and alleviated cognitive impairments in MHE rats. Conclusions These data suggest that ELT promotes synapse formation in vitro and in vivo via activating NRG1/ErbB4 signaling, serving as a promising therapeutic agent for MHE treatment.

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P2-432: Combined nutrient enrichment induces changes in synaptic protein expression in vitro

Alzheimer s & Dementia ◽

10.1016/j.jalz.2012.05.2057 ◽

2012 ◽

Vol 8 (4S_Part_11) ◽

pp. P417-P417

Author(s):

Patrick Kamphuis ◽

Paul Savelkoul ◽

Almar Kuipers ◽

Andrea Goudriaan ◽

Robert Hageman ◽

...

Keyword(s):

Protein Expression ◽

Nutrient Enrichment ◽

Synaptic Protein

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Restoration in vitro of the normal timing of exiting of cerebellar granule cell precursors from the cell cycle by Sonic hedgehog

Neuroscience Research ◽

10.1016/s0168-0102(00)81629-6 ◽

2000 ◽

Vol 38 ◽

pp. S130

Author(s):

Y Ishizaki

Keyword(s):

Cell Cycle ◽

Sonic Hedgehog ◽

Granule Cell ◽

Cerebellar Granule Cell ◽

Cerebellar Granule ◽

Granule Cell Precursors

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Long noncoding RNA OIP5-AS1 overexpression promotes viability and inhibits high glucose-induced oxidative stress of cardiomyocytes by targeting microRNA-34a/SIRT1 axis in diabetic cardiomyopathy

Endocrine Metabolic & Immune Disorders - Drug Targets ◽

10.2174/1871530321666201230090742 ◽

2020 ◽

Vol 21 ◽

Author(s):

Haiyun Sun ◽

Chong Wang ◽

Ying Zhou ◽

Xingbo Cheng

Keyword(s):

Oxidative Stress ◽

Protein Expression ◽

Diabetic Cardiomyopathy ◽

High Glucose ◽

Long Noncoding Rna ◽

Noncoding Rna ◽

Luciferase Reporter ◽

H9c2 Cells ◽

Promoting Effect

Objective: Diabetic cardiomyopathy (DCM) is an important complication of diabetes. This study was attempted to discover the effects of long noncoding RNA OIP5-AS1 (OIP5-AS1) on the viability and oxidative stress of cardiomyocyte in DCM. Methods: The expression of OIP5-AS1 and microRNA-34a (miR-34a) in DCM was detected by qRT-PCR. In vitro, DCM was simulated by high glucose (HG, 30 mM) treatment in H9c2 cells. The viability of HG (30 mM)-treated H9c2 cells was examined by MTT assay. The reactive oxygen species (ROS), superoxide dismutase (SOD) and malondialdehyde (MDA) levels were used to evaluate the oxidative stress of HG (30 mM)-treated H9c2 cells. Dual-luciferase reporter assay was used to confirm the interactions among OIP5-AS1, miR-34a and SIRT1. Western blot was applied to analyze the protein expression of SIRT1. Results: The expression of OIP5-AS1 was down-regulated in DCM, but miR-34a was up-regulated. The functional experiment stated that OIP5-AS1 overexpression increased the viability and SOD level, while decreased the ROS and MDA levels in HG (30 mM)-treated H9c2 cells. The mechanical experiment confirmed that OIP5-AS1 and SIRT1 were both targeted by miR-34a with the complementary binding sites at 3′UTR. MiR-34a overexpression inhibited the protein expression of SIRT1. In the feedback experiments, miR-34a overexpression or SIRT1 inhibition weakened the promoting effect on viability, and mitigated the reduction effect on oxidative stress caused by OIP5-AS1 overexpression in HG (30 mM)-treated H9c2 cells. Conclusions: OIP5-AS1 overexpression enhanced viability and attenuated oxidative stress of cardiomyocyte via regulating miR-34a/SIRT1 axis in DCM, providing a new therapeutic target for DCM.

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Upregulation of ETV2 Expression Promotes Endothelial Differentiation of Human Dental Pulp Stem Cells

Cell Transplantation ◽

10.1177/0963689720978739 ◽

2021 ◽

Vol 30 ◽

pp. 096368972097873

Author(s):

Jing Li ◽

Youming Zhu ◽

Na Li ◽

Tao Wu ◽

Xianyu Zheng ◽

...

Keyword(s):

Protein Expression ◽

Dental Pulp ◽

Tube Formation ◽

Endothelial Differentiation ◽

Cell Source ◽

Lentiviral Infection ◽

Mrna And Protein Expression ◽

Human Dental Pulp

The lack of vasculogenesis often hampers the survivability and integration of newly engineered tissue grafts within the host. Autologous endothelial cells (ECs) are an ideal cell source for neovascularization, but they are limited by their scarcity, lack of proliferative capacity, and donor site morbidity upon isolation. The objective of this study was to determine whether differentiation of human dental pulp stem cells (DPSCs) into the endothelial lineage can be enhanced by recombinant ETV2 overexpression. DPSCs were extracted from fresh dental pulp tissues. ETV2 overexpression in DPSCs was achieved by lentiviral infection and cellular morphological changes were evaluated. The mRNA and protein expression levels of endothelial-specific markers were assessed through quantitative real-time polymerase chain reaction, western blot, immunofluorescence staining, and flow cytometry. The tube formation assay and Matrigel plug assay were also performed to evaluate the angiogenic potential of the ETV2-transduced cells in vitro and in vivo, respectively. Additionally, proteomic analysis was performed to analyze global changes in protein expression following ETV2 overexpression. After lentiviral infection, ETV2-overexpressing DPSCs showed endothelial-like morphology. Compared with control DPSCs, significantly higher mRNA and protein expression levels of endothelial-specific genes, including CD31, VE-Cadherin, VEGFR1, and VEGFR2, were detected in ETV2-overexpressing DPSCs. Moreover, ETV2 overexpression enhanced capillary-like tube formation on Matrigel in vitro, as well as neovascularization in vivo. In addition, comparative proteomic profiling showed that ETV2 overexpression upregulated the expression of vascular endothelial growth factor (VEGF) receptors, which was indicative of increased VEGF signaling. Taken together, our results indicate that ETV2 overexpression significantly enhanced the endothelial differentiation of DPSCs. Thus, this study shows that DPSCs can be a promising candidate cell source for tissue engineering applications.

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Honeysuckle Aqueous Extracts Induced let-7a Suppress EV71 Replication and Pathogenesis In Vitro and In Vivo and Is Predicted to Inhibit SARS-CoV-2

Viruses ◽

10.3390/v13020308 ◽

2021 ◽

Vol 13 (2) ◽

pp. 308

Author(s):

Ying-Ray Lee ◽

Chia-Ming Chang ◽

Yuan-Chieh Yeh ◽

Chi-Ying F. Huang ◽

Feng-Mao Lin ◽

...

Keyword(s):

Protein Expression ◽

Western Blotting ◽

Expression Profiles ◽

Plaque Assay ◽

Virus Titer ◽

Enterovirus 71 ◽

Luciferase Reporter ◽

Pathogen Invasion

Honeysuckle (Lonicera japonica Thunb) is a traditional Chinese medicine (TCM) with an antipathogenic activity. MicroRNAs (miRNAs) are small non-coding RNA molecules that are ubiquitously expressed in cells. Endogenous miRNA may function as an innate response to block pathogen invasion. The miRNA expression profiles of both mice and humans after the ingestion of honeysuckle were obtained. Fifteen overexpressed miRNAs overlapped and were predicted to be capable of targeting three viruses: dengue virus (DENV), enterovirus 71 (EV71) and SARS-CoV-2. Among them, let-7a was examined to be capable of targeting the EV71 RNA genome by reporter assay and Western blotting. Moreover, honeysuckle-induced let-7a suppression of EV71 RNA and protein expression as well as viral replication were investigated both in vitro and in vivo. We demonstrated that let-7a targeted EV71 at the predicted sequences using luciferase reporter plasmids as well as two infectious replicons (pMP4-y-5 and pTOPO-4643). The suppression of EV71 replication and viral load was demonstrated in two cell lines by luciferase activity, RT-PCR, real-time PCR, Western blotting and plaque assay. Furthermore, EV71-infected suckling mice fed honeysuckle extract or inoculated with let-7a showed decreased clinical scores and a prolonged survival time accompanied with decreased viral RNA, protein expression and virus titer. The ingestion of honeysuckle attenuates EV71 replication and related pathogenesis partially through the upregulation of let-7a expression both in vitro and in vivo. Our previous report and the current findings imply that both honeysuckle and upregulated let-7a can execute a suppressive function against the replication of DENV and EV71. Taken together, this evidence indicates that honeysuckle can induce the expression of let-7a and that this miRNA as well as 11 other miRNAs have great potential to prevent and suppress EV71 replication.

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MicroRNA-1297 suppressed the Akt/GSK3β signaling pathway and stimulated neural apoptosis in an in vivo sevoflurane exposure model

Journal of International Medical Research ◽

10.1177/0300060520982104 ◽

2021 ◽

Vol 49 (4) ◽

pp. 030006052098210

Author(s):

Quan Wang ◽

Jingcong Luo ◽

Ruiqiang Sun ◽

Jia Liu

Keyword(s):

Protein Expression ◽

Signaling Pathway ◽

Neuronal Apoptosis ◽

In Vitro Model ◽

Nervous System Development ◽

Exposure Model ◽

Control Group ◽

Pten Protein ◽

Vitro Model

Objective Common inhalation anesthetics used for clinical anesthesia (such as sevoflurane) may induce nerve cell apoptosis during central nervous system development. Furthermore, anesthetics can produce cognitive impairments, such as learning and memory impairments, that continue into adulthood. However, the precise mechanism remains largely undefined. We aimed to determine the function of microRNA-1297 (miR-1297) in sevoflurane-induced neurotoxicity. Methods Reverse transcription-polymerase chain reaction assays were used to analyze miR-1297 expression in sevoflurane-exposed mice. MTT and lactate dehydrogenase (LDH) assays were used to measure cell growth, and neuronal apoptosis was analyzed using flow cytometry. Western blot analyses were used to measure PTEN, PI3K, Akt, and GSK3β protein expression. Results In sevoflurane-exposed mice, miR-1297 expression was up-regulated compared with the control group. MiR-1297 up-regulation led to neuronal apoptosis, inhibition of cell proliferation, and increased LDH activity in the in vitro model of sevoflurane exposure. MiR-1297 up-regulation also suppressed the Akt/GSK3β signaling pathway and induced PTEN protein expression in the in vitro model. PTEN inhibition (VO-Ohpic trihydrate) reduced PTEN protein expression and decreased the effects of miR-1297 down-regulation on neuronal apoptosis in the in vitro model. Conclusion Collectively, the results indicated that miR-1297 stimulates sevoflurane-induced neurotoxicity via the Akt/GSK3β signaling pathway by regulating PTEN expression.

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