| First Author | Biswas R | Year | 2018 |
| Journal | Biochim Biophys Acta Gen Subj | Volume | 1862 |
| Issue | 8 | Pages | 1770-1780 |
| PubMed ID | 29751100 | Mgi Jnum | J:265594 |
| Mgi Id | MGI:6199887 | Doi | 10.1016/j.bbagen.2018.05.008 |
| Citation | Biswas R, et al. (2018) Low-level laser therapy with 850nm recovers salivary function via membrane redistribution of aquaporin 5 by reducing intracellular Ca(2+) overload and ER stress during hyperglycemia. Biochim Biophys Acta Gen Subj 1862(8):1770-1780 |
| abstractText | The overall goal is to study the effect of low-level laser therapy (LLLT) on membrane distribution of major water channel protein aquaporin 5 (AQP5) in salivary gland during hyperglycemia. Par C10 cells treated with high glucose (50mM) showed a reduced membrane distribution of AQP5. The functional expression of AQP5 was downregulated due to intracellular Ca(2+) overload and ER stress. This reduction in AQP5 expression impairs water permeability and therefore results in hypo-salivation. A reduced salivary flow was also observed in streptozotocin (STZ)-induced diabetic mice model and the expression of AQP5 and phospho-AQP5 was downregulated. Low-level laser treatment with 850nm (30mW, 10min=18J/cm(2)) reduced ER stress and recovered AQP5 membrane distribution via serine phosphorylation in the cells. In the STZ-induced diabetic mouse, LLLT with 850nm (60J/cm(2)) increased salivary flow and upregulated of AQP5 and p-AQP5. ER stress was also reduced via downregulation of caspase 12 and CHOP. In silico analysis confirmed that the serine 156 is one of the most favorable phosphorylation sites of AQP5 and may contribute to the stability of the protein. Therefore, this study suggests high glucose inhibits phosphorylation-dependent AQP5 membrane distribution. High glucose induces intracellular Ca(2+) overload and ER stress that disrupt AQP5 functional expression. Low-level laser therapy with 850nm improves salivary function by increasing AQP5 membrane distribution in hyperglycemia-induced hyposalivation. |
