Liposomes effectively transport fatty proteins to targeted tissues. Laboratory experiments use multiple methods to administer liposomes, but comparison of these methods is not available. In this retrospective study, w...
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Liposomes effectively transport fatty proteins to targeted tissues. Laboratory experiments use multiple methods to administer liposomes, but comparison of these methods is not available. In this retrospective study, we characterized and compared four intravenous administration routes (tail vein, jugular catheter, femoral vein and percutaneous retro-orbital injections) in murine models. ApoE-/- mice were used to compare administration routes. Results indicate that the jugular catheter route delivered the highest amount of liposomes to tissues due to longer period of injections compared to other routes;however, this route failed to remain patent for 8/10 animals. Delivery via tail vein, femoral vein and percutaneous retro-orbital injections resulted in similar accumulation in the organs. When including technical difficulty and expense, percutaneous retro-orbital injections of liposomes are the most convenient and efficacious approach.
Despite the structural consenvation of PTEN with dual-specificity phosphatases,there have been no reports regarding the regulatory mechanisms that underlie this potential dual-phosphatase ***,we report that K27-linked...
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Despite the structural consenvation of PTEN with dual-specificity phosphatases,there have been no reports regarding the regulatory mechanisms that underlie this potential dual-phosphatase ***,we report that K27-linked polyubiquitination of PTEN at lysines 66 and 80 switches its phosphoinositide/protein tyrosine phosphatase activity to protein serine/threonine phosphatase ***,high glucose,TGF-β,CTGF,SHH,and IL-6 induce the expression of a long non-codingrna,GAEA (Glucose Aroused for EMT Activation),which associates with an rna-binding E3 ligase,MEX3C,and enhances its enzymatic activity,leading to the K27-linked polyubiquitination of *** MEX3C-catalyzed PTENK27-polyUb activates its protein serine/threonine phosphatase activity and inhibits its phosphatidylinositol/protein tyrosine phosphatase *** this altered enzymatic activity,PTENK27-polyub dephosphorylates the phosphoserine/threonine residues of TWlST1,SNAI1,and YAP1,leading to accumulation of these master regulators of *** with genetic inhibition of PTENK27polyUb,by a single nucieotide mutation generated using CRISPR/Cas9 (PtenK80R/K80R),exhibit inhibition of EMT markers during mammary gland morphogenesis in pregnancy/lactation and during cutaneous wound healing *** findings illustrate an unexpected paradigm in which the Incrna-dependent switch in PTEN protein serine/threonine phosphatase activity is important for physiological homeostasis and disease development.
Background: Atherosclerosis, which is the principal cause of heart attacks and strokes, is the leading cause of death in the United States. Various biological processes such as apoptosis and autophagy are involved in ...
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Background: Atherosclerosis, which is the principal cause of heart attacks and strokes, is the leading cause of death in the United States. Various biological processes such as apoptosis and autophagy are involved in almost every stage of atherosclerosis, which could lead to plaque instability causing stroke and death. Fatty Acid Binding Protein 4 (FABP4) is an adipokine released by macrophages and is involved in multiple disease conditions including stroke. However, the association of FABP4 with macrophage apoptosis and autophagy in atherosclerosis has not been elucidated. We hypothesize that silencing FABP4 protein could be a novel therapeutic approach to attenuate macrophage apoptosis and autophagy thereby minimizing plaque instability in atherosclerosis. Methods: RAW264 mouse macrophage cells were transfected with sirna control liposome quantum dots (QD), siFABP4 liposome QD at the concentration of 150 μg/ml total lipids, or TNF-α at 100 ng/ml. Western blot and reverse phase protein array (RPPA) analysis were completed. Results: Inhibiting the translation of FABP4 blocked the apoptotic pathway as evidenced from the increased expression of anti-apoptotic BCL-xL and BCL-2 along with reduced expression of BAX and activated Caspase 3 levels. Beclin-1 and LC3-II levels were also reduced with knocking down FABP4 indicating the attenuation of autophagy. Conclusion: Targeting FABP4 protects against macrophage processes associated with the progression of atherosclerosis.
Immune checkpoint inhibitors (ICIs) have been increasingly used in combination for cancer treatment but are associated with myocarditis. Here, we report that tumor-bearing mice exhibited response to treatment with com...
Immune checkpoint inhibitors (ICIs) have been increasingly used in combination for cancer treatment but are associated with myocarditis. Here, we report that tumor-bearing mice exhibited response to treatment with combinatorial anti-programmed cell death 1 and anti-cytotoxic T lymphocyte antigen-4 antibodies but also presented with cardiovascular toxicities observed clinically with ICI therapy, including myocarditis and arrhythmia. Female mice were preferentially affected with myocarditis compared to male mice, consistent with a previously described genetic model of ICI myocarditis and emerging clinical data. Mechanistically, myocardial tissue from ICI-treated mice, the genetic mouse model, and human heart tissue from affected patients with ICI myocarditis all exhibited down-regulation of MANF (mesencephalic astrocyte-derived neurotrophic factor) and HSPA5 (heat shock 70-kDa protein 5) in the heart;this down-regulation was particularly notable in female mice. ICI myocarditis was amplified by heart-specific genetic deletion of mouse Manf and was attenuated by administration of recombinant MANF protein, suggesting a causal role. Ironically, both MANF and HSPA5 were transcriptionally induced by liganded estrogen receptor beta and inhibited by androgen receptor. However, ICI treatment reduced serum estradiol concentration to a greater extent in female compared to male mice. Treatment with an estrogen receptor beta-specific agonist and androgen depletion therapy attenuated ICI-associated cardiac effects. Together, our data suggest that ICI treatment inhibits estradiol-dependent expression of MANF/HSPA5 in the heart, curtailing the cardiomyocyte response to immune injury. This endocrine-cardiac-immune pathway offers new insights into the mechanisms of sex differences in cardiac disease and may offer treatment strategies for ICI myocarditis.
We hereby provide the initial portrait of lincNORS, a spliced lincrna generated by the MIR193BHG locus, entirely distinct from the previously described miR-193b-365a tandem. While inducible by low O2 in a variety of c...
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We hereby provide the initial portrait of lincNORS, a spliced lincrna generated by the MIR193BHG locus, entirely distinct from the previously described miR-193b-365a tandem. While inducible by low O2 in a variety of cells and associated with hypoxia in vivo, our studies show that lincNORS is subject to multiple regulatory inputs, including estrogen signals. Biochemically, this lincrna fine-tunes cellular sterol/steroid biosynthesis by repressing the expression of multiple pathway components. Mechanistically, the function of lincNORS requires the presence of RALY, an rna-binding protein recently found to be implicated in cholesterol homeostasis. We also noticed the proximity between this locus and naturally occurring genetic variations highly significant for sterol/steroid-related phenotypes, in particular the age of sexual maturation. An integrative analysis of these variants provided a more formal link between these phenotypes and lincNORS, further strengthening the case for its biological relevance. noncoding transcripts contribute to the adaptation of cellular processes to oxygen levels. Here the authors characterize a hypoxia responsive lncrna lincNORS and show that it has a role in cellular sterol homeostasis.
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