Activation of muscarinic receptors in rat parotid acinar cells induces AQP5 trafficking to nuclei and apical plasma membrane
| Autor: | Gota Cho, Mariusz T. Skowronski, Di Wang, Masayuki Shono, Yasuko Ishikawa, Tomasz D. Pieczonka, Søren Nielsen, Aneta M. Bragiel |
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| Rok vydání: | 2015 |
| Předmět: |
Male
Nuclear Envelope Immunoelectron microscopy Biophysics Acinar Cells Biology Biochemistry Membrane Microdomains Muscarinic acetylcholine receptor medicine Animals Parotid Gland Rats Wistar Nuclear membrane Molecular Biology Cell Nucleus Water transport Cell Membrane Receptors Muscarinic Aquaporin 5 Rats Blot Protein Transport Membrane medicine.anatomical_structure Cytoplasm Nucleus |
| Zdroj: | Cho, G, Bragiel, A M, Wang, D, Pieczonka, T D, Skowronski, M T, Shono, M, Nielsen, S & Ishikawa, Y 2015, ' Activation of muscarinic receptors in rat parotid acinar cells induces AQP5 trafficking to nuclei and apical plasma membrane ', BBA Gene Regulatory Mechanisms, vol. 1850, no. 4, pp. 784-793 . https://doi.org/10.1016/j.bbagen.2015.01.009 |
| ISSN: | 0304-4165 |
| DOI: | 10.1016/j.bbagen.2015.01.009 |
| Popis: | BACKGROUND: The subcellular distribution of aquaporin-5 (AQP5) in rat parotid acinar cells in response to muscarinic acetylcholine receptor (mAChR) activation remains unclear.METHODS: Immunoconfocal and immunoelectron microscopy were used to visualize the distribution of AQP5 in parotid acinar cells. Western blotting was used to analyze AQP5 levels in membranes. To clarify the characteristics of membrane domains associated with AQP5, detergent solubility and sucrose-density flotation experiments were performed.RESULTS: Under control conditions, AQP5 was diffusely distributed on the apical plasma membrane (APM) and apical plasmalemmal region and throughout the cytoplasm. Upon mAChR activation, AQP5 was predominantly located in the nucleus, APM and lateral plasma membrane (LPM). Subsequently, localization of AQP5 in the nucleus, APM and LPM was decreased. Prolonged atropine treatment inhibited mAChR agonist-induced translocation of AQP5 to the nucleus, APM and LPM. AQP5 levels were enhanced in isolated nuclei and nuclear membranes prepared from parotid tissues incubated with mAChR agonist. mAChR agonist induced AQP5 levels in both soluble and insoluble nuclear fractions solubilized with Triton X-100 or Lubrol WX. Small amounts of AQP5 in nuclei were detected using low-density sucrose gradient. When AQP5 was present in the nuclear membrane, nuclear size decreased.CONCLUSION: The activation of mAChR induced AQP5 translocation to the nucleus, APM and LPM, and AQP5 may trigger water transport across the nuclear membrane and plasma membrane in rat parotid acinar cells.GENERAL SIGNIFICANCE: AQP5 translocates to the nuclear membrane and may trigger the movement of water, inducing shrinkage of the nucleus and the start of nuclear functions. |
| Databáze: | OpenAIRE |
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