8 results on '"Meimei Yin"'
Search Results
2. Dynamic interplay between IL-1 and WNT pathways in regulating dermal adipocyte lineage cells during skin development and wound regeneration
- Author
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Lixiang Sun, Xiaowei Zhang, Shuai Wu, Youxi Liu, Christian F. Guerrero-Juarez, Wenjie Liu, Jinwen Huang, Qian Yao, Meimei Yin, Jiacheng Li, Raul Ramos, Yanhang Liao, Rundong Wu, Tian Xia, Xinyuan Zhang, Yichun Yang, Fengwu Li, Shujun Heng, Wenlu Zhang, Minggang Yang, Chi-Meng Tzeng, Chao Ji, Maksim V. Plikus, Richard L. Gallo, and Ling-juan Zhang
- Subjects
CP: Developmental biology ,CP: Stem cell research ,Biology (General) ,QH301-705.5 - Abstract
Summary: Dermal adipocyte lineage cells are highly plastic and can undergo reversible differentiation and dedifferentiation in response to various stimuli. Using single-cell RNA sequencing of developing or wounded mouse skin, we classify dermal fibroblasts (dFBs) into distinct non-adipogenic and adipogenic cell states. Cell differentiation trajectory analyses identify IL-1-NF-κB and WNT-β-catenin as top signaling pathways that positively and negatively associate with adipogenesis, respectively. Upon wounding, activation of adipocyte progenitors and wound-induced adipogenesis are mediated in part by neutrophils through the IL-1R-NF-κB-CREB signaling axis. In contrast, WNT activation, by WNT ligand and/or ablation of Gsk3, inhibits the adipogenic potential of dFBs but promotes lipolysis and dedifferentiation of mature adipocytes, contributing to myofibroblast formation. Finally, sustained WNT activation and inhibition of adipogenesis is seen in human keloids. These data reveal molecular mechanisms underlying the plasticity of dermal adipocyte lineage cells, defining potential therapeutic targets for defective wound healing and scar formation.
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- 2023
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3. Keratin 6, 16 and 17—Critical Barrier Alarmin Molecules in Skin Wounds and Psoriasis
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Xiaowei Zhang, Meimei Yin, and Ling-juan Zhang
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keratins ,epidermal keratinocytes ,barrier alarmins ,skin wounds ,psoriasis ,proliferation ,innate immune responses ,autoimmune ,Cytology ,QH573-671 - Abstract
Located at the skin surface, keratinocytes (KCs) are constantly exposed to external stimuli and are the first responders to invading pathogens and injury. Upon skin injury, activated KCs secrete an array of alarmin molecules, providing a rapid and specific innate immune response against danger signals. However, dysregulation of the innate immune response of KCs may lead to uncontrolled inflammation and psoriasis pathogenesis. Keratins (KRT) are the major structural intermediate filament proteins in KCs and are expressed in a highly specific pattern at different differentiation stages of KCs. While KRT14-KRT5 is restricted to basal proliferative KCs, and KRT10-KRT1 is restricted to suprabasal differentiated KCs in normal skin epidermis, the wound proximal KCs downregulate KRT10-K1 and upregulate KRT16/KRT17-KRT6 upon skin injury. Recent studies have recognized KRT6/16/17 as key early barrier alarmins and upregulation of these keratins alters proliferation, cell adhesion, migration and inflammatory features of KCs, contributing to hyperproliferation and innate immune activation of KCs in response to an epidermal barrier breach, followed by the autoimmune activation of T cells that drives psoriasis. Here, we have reviewed how keratins are dysregulated during skin injury, their roles in wound repairs and in initiating the innate immune system and the subsequent autoimmune amplification that arises in psoriasis.
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- 2019
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4. Deletion of Protein Kinase D3 Promotes Liver Fibrosis in Mice.
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Shuya Zhang, Huan Liu, Meimei Yin, Xiuying Pei, Hausser, Angelika, Ishikawa, Eri, Sho Yamasaki, and Zheng Gen Jin
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- 2020
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5. Endothelial-specific YY1 governs sprouting angiogenesis through directly interacting with RBPJ.
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Shuya Zhang, Ji Young Kim, Suowen Xu, Huan Liu, Meimei Yin, Koroleva, Marina, Jia Guo, Xiuying Pei, and Zheng Gen Jin
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NEOVASCULARIZATION ,NOTCH proteins ,RETINAL blood vessels ,TRANSCRIPTION factors ,CARRIER proteins - Abstract
Angiogenesis, the formation of new blood vessels, is tightly regulated by gene transcriptional programs. Yin Ying 1 (YY1) is a ubiquitously distributed transcription factor with diverse and complex biological functions; however, little is known about the cell-type-specific role of YY1 in vascular development and angiogenesis. Here we report that endothelial cell (EC)-specific YY1 deletion in mice led to embryonic lethality as a result of abnormal angiogenesis and vascular defects. Tamoxifen-inducible EC-specific YY1 knockout (YY1
iΔEC ) mice exhibited a scarcity of retinal sprouting angiogenesis with fewer endothelial tip cells. YY1iΔEC mice also displayed severe impairment of retinal vessel maturation. In an ex vivo mouse aortic ring assay and a human EC culture system, YY1 depletion impaired endothelial sprouting and migration. Mechanistically, YY1 functions as a repressor protein of Notch signaling that controls EC tip-stalk fate determination. YY1 deficiency enhanced Notch-dependent gene expression and reduced tip cell formation. Specifically, YY1 bound to the N-terminal domain of RBPJ (recombination signal binding protein for Ig Kappa J region) and competed with the Notch coactivator MAML1 (mastermind-like protein 1) for binding to RBPJ, thereby impairing the NICD (intracellular domain of the Notch protein)/MAML1/RBPJ complex formation. Our study reveals an essential role of endothelial YY1 in controlling sprouting angiogenesis through directly interacting with RBPJ and forming a YY1-RBPJ nuclear repression complex. [ABSTRACT FROM AUTHOR]- Published
- 2020
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6. Enhanced enteroviral infectivity via viral protease-mediated cleavage of Grb2-associated binder 1.
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Haoyu Deng, Gabriel Fung, Junyan Shi, Suowen Xu, Chen Wang, Meimei Yin, Jun Hou, Jingchun Zhang, Zheng-Gen Jin, and Honglin Luo
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ENTEROVIRUS diseases ,SCAFFOLD proteins ,COXSACKIEVIRUS diseases ,COXSACKIEVIRUSES ,CELLULAR signal transduction ,MOLECULAR docking ,DISEASE risk factors ,THERAPEUTICS - Abstract
Coxsackievirus B3 (CVB3), an important human causative pathogen for viral myocarditis, pancreatitis, and meningitis, has evolved different strategies to manipulate the host signaling machinery to ensure successful viral infection. We previously revealed a crucial role for the ERK1/2 signaling pathway in regulating viral infectivity. However, the detail mechanism remains largely unknown. Grb2-associated binder 1 (GAB1) is an important docking protein responsible for intracellular signaling assembly and transduction. In this study, we demonstrated that GAB1 was proteolytically cleaved after CVB3 infection at G175 and G436 by virus-encoded protease 2A
pro , independent of caspase activation. Knockdown of GAB1 resulted in a significant reduction of viral protein expression and virus titers. Moreover, we showed that virus-induced cleavage of GAB1 is beneficial to viral growth as the N-terminal proteolytic product of GAB1 (GAB1-N1-174) further enhances ERK1/2 activation and promotes viral replication. Our results collectively suggest that CVB3 targets host GAB1 to generate a GAB1-N1-174 fragment that enhances viral infectivity, at least in part, via activation of the ERK pathway. The findings in this study suggest a novel mechanism that CVB3 employs to subvert the host signaling and facilitate consequent viral replication. [ABSTRACT FROM AUTHOR]- Published
- 2015
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7. Metformin improves cardiac function in a nondiabetic rat model of post-MI heart failure.
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Meimei Yin, van der Horst, Iwan C. C., van Melle, Joost P., Cheng Qian, van Gilst, Wiek H., Silljé, Herman H. W., and de Boer, Rudolf A.
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METFORMIN , *MYOCARDIAL infarction , *DIABETES , *ECHOCARDIOGRAPHY , *INSULIN , *RATS , *MESSENGER RNA - Abstract
Metformin is the first choice drug for the treatment of patients with diabetes, but its use is debated in patients with advanced cardiorenal disease. Epidemiological data suggest that metformin may reduce cardiac events, in patients both with and without heart failure. Experimental evidence suggests that metformin reduces cardiac ischemia-reperfusion injury. It is unknown whether metformin improves cardiac function (remodeling) in a long-term post-MI remodeling model. We therefore studied male, nondiabetic, Sprague-Dawley rats that were subjected to either myocardial infarction (MI) or sham operation. Animals were randomly allocated to treatment with normal water or metformin-containing water (250 mg·kg-1·day-1). At baseline, 6 wk, and 12 wk, metabolic parameters were analyzed and oral glucose tolerance tests (OGTT) were performed. Echocardiography and hemodynamic parameters were assessed 12 wk after MI. In the MI model, infarct size was significantly smaller after 12-wk metformin treatment (29.6 ± 3.2 vs. 38.0 ± 2.2%, P < 0.05). Moreover, metformin resulted in less left ventricular dilatation (6.0 ± 0.4 vs. 7.6 ± 0.6 mm, P < 0.05) and preservation of left ventricular ejection fraction (65.8 ± 3.7% vs. 48.6 ± 5.6%, P < 0.05) compared with MI control. The improved cardiac function was associated with decreased atrial natriuretic peptide mRNA levels in the metformin-treated group (50% reduction compared with MI, P < 0.05). Insulin resistance did not occur during cardiac remodeling (as indicated by normal OGTT) and fasting glucose levels and the pattern of the OGTT were not affected by metformin. Molecular analyses suggested that altered AMP kinase phosphorylation status and low insulin levels mediate the salutary effects of metformin. Altogether our results indicate that metformin may have potential to attenuate heart failure development after myocardial infarction, in the absence of diabetes and independent of systemic glucose levels. [ABSTRACT FROM AUTHOR]
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- 2011
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8. Essential roles of Gab1 tyrosine phosphorylation in growth factor-mediated signaling and angiogenesis.
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Weiye Wang, Suowen Xu, Meimei Yin, and Zheng Gen Jin
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NEOVASCULARIZATION , *PROTEIN-tyrosine kinases , *PHOSPHORYLATION , *GROWTH factors , *CELL physiology , *CELLULAR signal transduction , *MOLECULAR interactions - Abstract
Growth factors and their downstream receptor tyrosine kinases (RTKs) mediate a number of biological processes controlling cell function. Adaptor (docking) proteins, which consist exclusively of domains and motifs that mediate molecular interactions, link receptor activation to downstream effectors. Recent studies have revealed that Grb2-associated-binders (Gab) family members (including Gab1, Gab2, and Gab3), when phosphorylated on tyrosine residues, provide binding sites for multiple effector proteins, such as Src homology-2 (SH2)-containing protein tyrosine phosphatase 2 (SHP2) and phosphatidylinositol 3-kinase (PI3K) regulatory subunit p85, thereby playing important roles in transducing RTKs-mediated signals into pathways with diversified biological functions. Here, we provide an up-to-date overview on the domain structure and biological functions of Gab1, the most intensively studied Gab family protein, in growth factor signaling and biological functions, with a special focus on angiogenesis. [ABSTRACT FROM AUTHOR]
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- 2015
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