ABSTRACT
Intracellular tension is the most important characteristic of neuron polarization as well as the growth and regeneration of axons, which can be generated by motor proteins and conducted along the cytoskeleton. To better understand this process, we created Förster resonance energy transfer (FRET)-based tension probes that can be incorporated into microfilaments to provide a real-time measurement of forces in neuron cytoskeletons. We found that our probe could be used to assess the structural tension of neuron polarity. Nerve growth factor (NGF) upregulated structural forces, whereas the glial-scar inhibitors chondroitin sulfate proteoglycan (CSPG) and aggrecan weakened such forces. Notably, the tension across axons was distributed uniformly and remarkably stronger than that in the cell body in NGF-stimulated neurons. The mechanosensors talin/vinculin could antagonize the effect of glial-scar inhibitors via structural forces. However, E-cadherin was closely associated with glial-scar inhibitor-induced downregulation of structural forces. Talin/vinculin was involved in the negative regulation of E-cadherin transcription through the nuclear factor-kappa B pathway. Collectively, this study clarified the mechanism underlying intracellular tension in the growth and regeneration of axons which, conversely, can be regulated by talin and E-cadherin.
Subject(s)
Axon Guidance/physiology , Intracellular Fluid/physiology , Nerve Regeneration/physiology , Talin/physiology , Animals , Axon Guidance/drug effects , Cadherins/physiology , Cells, Cultured , HEK293 Cells , Humans , Intracellular Fluid/drug effects , Mice , Nerve Growth Factor/pharmacology , Nerve Growth Factor/physiology , Nerve Regeneration/drug effects , Neuronal Outgrowth/drug effects , Neuronal Outgrowth/physiology , Rats , Talin/chemistryABSTRACT
Objective To investigate the expression change of LRP16 in endometrial cancer tissues and its influence on the pro-liferation of human endometrial carcinoma HEC-1-B cells .Methods HEC-1-B cells were transfected with LRP16 .RT-PCR was used to examine the expression of LRP16 in 26 normal endometrium specimens ,10 endometrial cancer specimens .RT-PCR was used for verifying the transfection success .WES-T was used to observe the proliferation change of HEC-1-B cells .Results The positive expression rate and level of LRP16 mRNA in the endometrial cancer tissues were 83 .33% and 0 .82 ± 0 .21 ,which were significantly higher than 30 .00% ,0 .47 ± 0 .18 in the normal endometrium tissues(P<0 .05) .The RT-PCR detection results revealed that the expression of LRP16 mRNA after transfection was significantly increased .HEC-1-B cells in the transfection group could continued to proliferate in vitro ,but the proliferation capacity was not increased .Conclusion The expression abnormality of LRP16 may be closely related to the occurrence and progress of endometrial cancer ,LRP16 gene may have potential value for the endometrial canc-er gene therapy .
