Ca2+ Signalling Lab

Research lines

Unravelling the role of mitochondrial (dys)function in AD pathogenesis

We use state-of-the-art technologies and tools for a wide array of analyses, both in vitro and in vivo. Our research covers mitochondrial Ca2+ handling, organelle coupling with other intracellular structures, and organelle metabolism/bioenergetics at different disease stages in PS2-based AD mouse models. We are also interested in verifying possible links between mitochondrial defects and behavioural impairment.

Relevant publications

  1. Rossi A, Rigotto G, Valente G, Giorgio V, Basso E, Filadi R, Pizzo P. (2020) Defective mitochondrial pyruvate flux affects cell bioenergetics in Alzheimer's Disease-related models. Cell Reports 30:2332‑2348.e10
  2. Theurey P, Connolly NMC, Fortunati I, Basso E, Lauwen S, Ferrante C, Moreira Pinho C, Joselin A, Gioran A, Bano D, Park DS, Ankarcrona M, Pizzo P, Prehn JHM. (2019) Systems biology identifies preserved integrity but impaired metabolism of mitochondria due to a glycolytic defect in Alzheimer's disease neurons. Aging Cell 18:e12924
  3. Filadi R, Greotti E, Turacchio G, Luini A, Pozzan T, Pizzo P. (2016) Presenilin 2 modulates endoplasmic reticulum-mitochondria coupling by tuning the antagonistic effect of Mitofusin 2. Cell Reports 15:2226‑2238
  4. Zampese E, Fasolato C, Kipanyula MJ, Bortolozzi M, Pozzan T, Pizzo P (2011) Presenilin 2 modulates endoplasmic reticulum (ER)-mitochondria interactions and Ca2+ cross-talk. Proc Natl Acad Sci USA, 108:2777–2782

Ca2+ homeostasis defects in AD models

Cytosolic and organelle Ca2+ handling is studied in AD cell and animal models, not only in neurons but also in glial cells, both in vitro and at the circuit level. The role of amyloid accumulation and defective Ca2+ homeostasis on brain functionality is also investigated by recording spontaneous brain oscillatory activity of AD mice in vivo.

Relevant publications

  1. Pizzo P, Basso E, Filadi R, Greotti E, Leparulo A, Pendin D, Redolfi N, Rossini M., Vajente N, Pozzan T. and Fasolato C. “Presenilin-2 and Calcium Handling: Molecules, Organelles, Cells and Brain Networks” Cells 2020, 9(10) 2166; PMID: 32992
  2. Scremin E, Agostini M, Leparulo A, Pozzan T, Greotti E, Fasolato C. ORAI2 Down-Regulation Potentiates SOCE and Decreases Aβ42 Accumulation in Human Neuroglioma Cells. Int J Mol Sci. 2020 Jul 25;21(15):5288. doi:10.3390/ijms21155288. PMID: 32722509; PMCID: PMC7432374
  3. Leparulo A, Mahmud M, Scremin E, Pozzan T, Vassanelli S, Fasolato C. Dampened Slow Oscillation Connectivity Anticipates Amyloid Deposition in the PS2APP Mouse Model of Alzheimer's Disease.” Cells 2020, 9(1) pii: E54. doi: 10.3390/cells9010054 (2020) 9(1). PMID: 31878336
  4. Greotti E, Capitanio P, Wong A, Pozzan T, Pizzo P, Pendin D. (2019). Familial Alzheimer’s disease-linked presenilin mutants and intracellular Ca2+ handling: A single-organelle, FRET-based analysis. Cell Calcium, 79:44–56.

Modeling neurodegenerative disorders in Drosophila melanogaster

We use Drosophila as a model to study the neurodegenerative disorder Hereditary Spastic Paraplegia. We are focused on understanding how ER shape-impairment, due to HSP gene mutations, affects specific ER functions.

Relevant publications

  1. Montagna A, Vajente N, Pendin D, Daga A. In vivo Analysis of CRISPR/Cas9 Induced Atlastin Pathological Mutations in Drosophila. Front Neurosci. 2020 Oct 15;14:547746
  2. Vajente N, Norante R, Redolfi N, Daga A, Pizzo P, Pendin D. Microtubules Stabilization by Mutant Spastin Affects ER Morphology and Ca2+ Handling. Front Physiol. 2019 Dec 20;10:1544

Subcellular indicators

We are interest in the generation of chemical and genetically-encoded biosensors, for both Ca2+ and other ions and metabolites, targeted to specific subcellular locations to finely dissect intracellular signalling pathways. These tools are instrumental for determining a high-resolution map of the heterogeneity of signalling pathways within the cell. Furthermore, we develop tools to manipulate the functions of organelles, exploiting state-of-the-art methods, such as optogenetics.

Relevant publications

  1. Greotti E, Fortunati I, Pendin D, Ferrante C, Galla L, Zentilin L, Giacca M, Kaludercic N, Di Sante M, Mariotti L, Lia A, Gómez-Gonzalo M, Sessolo M, Di Lisa F, Carmignoto G, Bozio R, Pozzan T. mCerulean3-Based Cameleon Sensor to Explore Mitochondrial Ca2+ Dynamics In Vivo. iScience. 2019 Jun 28;16:340-355. doi: 10.1016/j.isci.2019.05.031. Epub 2019 May 27. Erratum in: iScience. 2019 Sep 27;19:161. PMID: 31203189; PMCID: PMC6581653
  2. Tkatch T, Greotti E, Baranauskas G, Pendin D, Roy S, Nita LI, Wettmarshausen J, Prigge M, Yizhar O, Shirihai OS, Fishman D, Hershfinkel M, Fleidervish IA, Perocchi F, Pozzan T, Sekler I. Optogenetic control of mitochondrial metabolism and Ca2+ signaling by mitochondria-targeted opsins. Proc Natl Acad Sci U S A. 2017 Jun 27;114(26):E5167-E5176. doi: 10.1073/pnas.1703623114. Epub 2017 Jun 13. PMID: 28611221; PMCID: PMC5495261
  3. Greotti E, Wong A, Pozzan T, Pendin D, Pizzo P. Characterization of the ER-Targeted Low Affinity Ca2+ Probe D4ER. Sensors (Basel). 2016 Sep 2;16(9):1419. doi: 10.3390/s16091419. PMID: 27598166; PMCID: PMC5038697
  4. Pendin D, Norante R, De Nadai A, Gherardi G, Vajente N, Basso E, Kaludercic N, Mammucari C, Paradisi C, Pozzan T, Mattarei A. A Synthetic Fluorescent Mitochondria-Targeted Sensor for Ratiometric Imaging of Calcium in Live Cells. Angew Chem Int Ed Engl. 2019 Jul 15;58(29):9917-9922

Active grants

  • Fondazione Cariparo and Fondazione Telethon • Grant GJC21054 • Deorphanizing and functionalizing the mitochondrial protein TMEM65 • 2022-2024.
  • Cure Alzheimer's FundExtracellular ATP is a key factor in promoting Alzheimer's disease neuroinflammation • 2021-2023.
  • Cariparo Foundation Excellence Research Projects • Grant DSB.AD004.197 • Early dysfunctions of astrocytic calcium signaling in Alzheimer's disease • 2018-2021.
  • University of Padua Grant SID2019 • Mitochondrial metabolism in Alzheimer’s disease • 2019-2021.
  • Telethon • Grant GGP19304 • Plasmalogen-based therapeutic strategy for the treatment of Hereditary Spastic Paraplegia • 2019-2022.
  • Progetti di Ricerca di Rilevante Interesse Nazionale (PRIN 2017; Italian Ministry of Research Grant 2017XA5J5N) • A shape to fit the need: how cells rearrange their organelle composition and architecture during development and stress • 2019-2023.
  • Progetti di Ricerca di Rilevante Interesse Nazionale (PRIN 2017; Italian Ministry of Research Grant 20175C22WM) • Early dysfunction of intercellular signaling in brain disorders • 2019-2023.

Our lab is also part of the Advanced Light Microscopy Italian Node of Euro-BioImaging.