Abstract
Mevalonate kinase deficiency is a rare disease whose worst manifestation, characterised by severe neurologic impairment, is called mevalonic aciduria. The progressive neuronal loss associated to cell death can be studied in vitro with a simplified model based on a biochemical block of the mevalonate pathway and a subsequent inflammatory trigger. The aim of this study was to evaluate the effect of the mevalonate blocking on glial cells (BV-2) and the following effects on neuronal cells (SH-SY5Y) when the two populations were cultured together. To better understand the cross-talk between glial and neuronal cells, as it happens in vivo, BV-2 and SH-SY5Y were co-cultured in different experimental settings (alone, transwell, direct contact); the effect of mevalonate pathway biochemical block by Lovastatin, followed by LPS inflammatory trigger, were evaluated by analysing programmed cell death and mitochondrial membrane potential, cytokines’ release and cells’ morphology modifications. In this experimental condition, glial cells underwent an evident activation, confirmed by elevated pro-inflammatory cytokines release, typical of these disorders, and a modification in morphology. Moreover, the activation induced an increase in apoptosis. When glial cells were co-cultured with neurons, their activation caused an increase of programmed cell death also in neuronal cells, but only if the two populations were cultured in direct contact. Our findings, being aware of the limitations related to the cell models used, represent a preliminary step towards understanding the pathological and neuroinflammatory mechanisms occurring in mevalonate kinase diseases. Contact co-culture between neuronal and microglial cells seems to be a good model to study mevalonic aciduria in vitro, and to contribute to the identification of potential drugs able to block microglial activation for this orphan disease. In fact, in such a pathological condition, we demonstrated that microglial cells are activated and contribute to neuronal cell death. We can thus hypothesise that the use of microglial activation blockers could prevent this additional neuronal death.
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Acknowledgments
This study was supported by a grant from the Institute for Maternal and Child Health – IRCCS “Burlo Garofolo”, Trieste, Italy (RC 42/2011). We would like to thank Dr. A. Tommasini (Institute for Maternal and Child Health – IRCCS “Burlo Garofolo”, Trieste, Italy) for kindly providing the BV-2 cell line, and Prof. S. Gustincich (Department of Neurobiology, International School for Advanced Studied S.I.S.S.A.-I.S.A.S. Trieste, Italy) for kindly providing the SH-SY5Y cell line.
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Supplementary Fig. 1
Experimental plan. Microglial cell line (BV-2) and neuronal cell line (SH-SY5Y) were plated alone, in transwell or in direct co-culture. After the first 48 h of culture Lova was added to block the mevalonate pathway and the cell were maintained in culture for further 24 h. Then LPS was administered to stimulate the inflammatory response and cell were culture for 24 h. At the end of incubation period, supernatants were collected for the evaluation of cytokine’s release, while cells were harvested to perform the analysis of programmed cell death and mitochondrial potential assay or treated for immunocytochemistry assay. Supplementary material 1 (PDF 40 kb)
Supplementary Fig. 2
Gating strategy for Programmed Cell Death analysis. Representative dot plot of PCD flow cytometric analysis. A) Debris were excluded from the analysis based on the scatter. B) Microglial cells (BV-2) were identified as CellTrace Far Red DDAO-SE positive cells, while neuronal cells (SH-SY5Y) were unstained. C) and D) Live cells were identified as double negative cells (lower left quadrant); dead cells were identified as Annexin V positive cells (upper + lower right quadrant). Supplementary material 2 (JPEG 210 kb)
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Tricarico, P.M., Piscianz, E., Monasta, L. et al. Microglia activation and interaction with neuronal cells in a biochemical model of mevalonate kinase deficiency. Apoptosis 20, 1048–1055 (2015). https://doi.org/10.1007/s10495-015-1139-8
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DOI: https://doi.org/10.1007/s10495-015-1139-8