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The regenerative ability of CNS axons decreases with age, however, this ability remains largely intact in PNS axons throughout adulthood. These differences are likely to correspond with age-related silencing of proteins necessary for axon growth and elongation. In previous studies, it has been shown that reintroduction of the α9 integrin subunit (tenascin-C receptor, α9) that is downregulated in adult CNS can improve neurite outgrowth and sensory axon regeneration after a dorsal rhizotomy or a dorsal column crush spinal cord lesion. In the current study, we demonstrate that virally expressed integrins (α9, α6, or β1 integrin) in the adult rat sensorimotor cortex and adult red nucleus are excluded from axons following neuronal transduction. Attempts to stimulate transport by inclusion of a cervical spinal injury and thus an upregulation of extracellular matrix molecules at the lesion site, or cotransduction with its binding partner, β1 integrin, did not induce integrin localization within axons. In contrast, virally expressed α9 integrin in developing rat cortex (postnatal day 5 or 10) demonstrated clear localization of integrins in cortical axons revealed by the presence of integrin in the axons of the corpus callosum and internal capsule, as well as in the neuronal cell body. Furthermore, examination of dorsal root ganglia neurons and retinal ganglion cells demonstrated integrin localization both within peripheral nerve as well as dorsal root axons and within optic nerve axons, respectively. Together, our results suggest a differential ability for in vivo axonal transport of transmembrane proteins dependent on neuronal age and subtype.
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http://dx.doi.org/10.1523/ENEURO.0029-16.2016 | DOI Listing |
Nat Commun
December 2024
Department of Materials Science and Engineering, Korea University, Seoul, Republic of Korea.
The native extracellular matrix is continuously remodeled to form complex interconnected network structures that reversibly regulate stem cell behaviors. Both regulation and understanding of its intricate dynamicity can help to modulate numerous cell behaviors. However, neither of these has yet been achieved due to the lack of designing and modeling such complex structures with dynamic controllability.
View Article and Find Full Text PDFJ Inflamm Res
December 2024
Department of Obstetrics and Gynecology, The First Affiliated Hospital of Harbin Medical University, Harbin, People's Republic of China.
Purpose: To investigate the combined effects of super-active platelet lysate (sPL) and acellular amniotic membrane (AAM) in promoting endometrial repair and enhancing endometrial receptivity in rats.
Methods: The characteristics of sPL-AAM were examined through scanning electron microscopy, contact angle tester, and release experiments. We aimed to establish a rat model for endometrial injury.
Unlabelled: The recycling of integrin endocytosed during focal adhesion (FA) disassembly is critical for cell migration and contributes to the polarized formation of new FAs toward the leading edge. How this occurs is unclear. Here, we sought to identify the kinesin motor protein(s) that is involved in recycling endocytosed integrin back to the plasma membrane.
View Article and Find Full Text PDFCell Mol Biol (Noisy-le-grand)
November 2024
Department of Pharmacy, College of Pharmacy, Dankook University, Cheonan 31116, Republic of Korea.
In the current study, we investigated the effects and action mechanism of integrin a3b1 in modulating non-small cell lung cancer (NSCLC) growth and progression. Reduced expression of integrin a3 by RNA silencing in p53 wild-type A549 NSCLC cells inhibits cell migration and invasion, compared with those in control cells. These anti-migratory and anti-invasive properties in integrin a3-silenced cells were associated with epithelial cadherin (E-cadherin) distribution at cell-cell contacts, and these effects require the activation of p70 S6 kinase (p70S6K) as evidenced by treatment with rapamycin.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!