# Tullio Pozzan
**Tullio Pozzan** (22 February 1949 – 15 October 2022) was an Italian cell biologist and general pathologist at the University of Padova who transformed the study of calcium signaling in living cells, first as a co-developer of trappable fluorescent calcium indicators and then through genetically encoded probes targeted to individual organelles.[1](https://doi.org/10.6084/m9.figshare.c.8440765) His 1992 demonstration that mitochondria rapidly take up calcium during physiological stimulation established the organelle as a central hub in shaping cellular calcium signals.[1](https://doi.org/10.6084/m9.figshare.c.8440765) He was elected a Foreign Member of the Royal Society in 2018[2](https://royalsociety.org/people/tullio-pozzan-13833/) and died on 15 October 2022.[2](https://royalsociety.org/people/tullio-pozzan-13833/) According to a memorial by the [Accademia dei Lincei](https://www.edgepedia.org/accademia-dei-lincei), his birthplace was Mestre[3](https://lincei.it/it/notizie/il-socio-tullio-pozzan-emerito-di-patologia-generale-si-e-spento-il-15-ottobre), or simply Venice according to another memorial.[4](https://aecardiffknowledgehub.wales/2022/10/17/in-memoriam-tullio-pozzan-1949-2022/)
| Key facts | |
|---|---|
| Born; died | 1949; 15 October 2022[1](https://doi.org/10.6084/m9.figshare.c.8440765) |
| Field | Calcium signaling, general pathology[5](https://people.embo.org/profile/tullio-pozzan) • [6](https://www.ae-info.org/ae/User/Pozzan_Tullio) |
| Signature work | Mitochondrially targeted recombinant aequorin, *Nature*, 1992[7](https://doi.org/10.1038/358325a0) |
| Training | MD, University of Padova, 1973; EMBO Long Term Fellow, Cambridge, 1978–1981[2](https://royalsociety.org/people/tullio-pozzan-13833/) |
| Chair | Professor of General Pathology from 1986; department chairman for 12 years[2](https://royalsociety.org/people/tullio-pozzan-13833/) |
| Honors | EMBO (1990), Academia Europaea (1998), Accademia dei Lincei (2001), US National Academy of Sciences (2006), Royal Society (2018)[6](https://www.ae-info.org/ae/User/Pozzan_Tullio) |
| Institute role | Founding member of the Veneto Institute of Molecular Medicine[8](https://www.vimm.it/en/people/founding-members/) |
## Training and early career
Pozzan graduated in Medicine and Surgery at the University of Padova in 1973, with a thesis on the physiology of mitochondria prepared under Professor G. Azzone in the Institute of General Pathology.[3](https://lincei.it/it/notizie/il-socio-tullio-pozzan-emerito-di-patologia-generale-si-e-spento-il-15-ottobre) The Royal Society records him as a postdoc at the Department of Biochemistry in Cambridge from 1978 to 1981,[2](https://royalsociety.org/people/tullio-pozzan-13833/) as an EMBO Long Term Fellow there in the same years;[6](https://www.ae-info.org/ae/User/Pozzan_Tullio) the Accademia dei Lincei places his arrival in Cambridge in October 1977.[3](https://lincei.it/it/notizie/il-socio-tullio-pozzan-emerito-di-patologia-generale-si-e-spento-il-15-ottobre)
In Cambridge he joined the group that developed the technique for measuring calcium in living cells with fluorescent indicators trapped inside the cell, published in landmark papers in *Nature* and the *Journal of Cell Biology* in 1982; the method became the standard for measuring intracellular calcium.[9](https://pmc.ncbi.nlm.nih.gov/articles/PMC9677533/) The Royal Society credits him with participating in the development of these intracellular trappable fluorescent Ca2+ indicators.[2](https://royalsociety.org/people/tullio-pozzan-13833/)
## Representative work
His signature paper, published in *Nature* in 1992, fused the cDNA of the calcium-sensitive photoprotein aequorin in frame with that encoding a mitochondrial presequence and expressed the hybrid in bovine endothelial cells, allowing continuous in situ monitoring of free Ca2+ in the mitochondrial matrix.[7](https://doi.org/10.1038/358325a0) It showed that agonist-stimulated elevations of cytosolic free calcium evoke rapid, transient increases in mitochondrial matrix calcium, which a mitochondrial uncoupler prevents.[7](https://doi.org/10.1038/358325a0) The Royal Society's memoir records this 1992 discovery of mitochondrial calcium uptake at physiological levels of stimulation as having transformed the understanding of cell signaling.[1](https://doi.org/10.6084/m9.figshare.c.8440765)
## Calcium and cAMP probes
The targeted-aequorin approach grew into a family of tools. A 1996 *PNAS* paper extended it to single-cell imaging in CHO cells, showing that receptor stimulation raised matrix calcium to peaks exceeding those needed for full activation of pyruvate dehydrogenase in situ.[10](https://www.pnas.org/doi/abs/10.1073/pnas.93.11.5489) His Padua laboratory also developed organelle-targeted GFP-based indicators for monitoring calcium dynamics in the endoplasmic reticulum, [Golgi apparatus](https://www.edgepedia.org/golgi-apparatus), mitochondria, and peroxisomes.[11](https://biomed.unipd.it/en/node/622)
His group generated the first genetically encoded fluorescent cAMP probe, contributed to establishing the concept of cAMP microdomains, and described an autonomous cAMP homeostatic mechanism within the mitochondrial matrix;[2](https://royalsociety.org/people/tullio-pozzan-13833/) the group produced subcellularly targeted cAMP probes for the plasma membrane, mitochondria, and nucleus, applying them to cardiac excitability and disease models.[11](https://biomed.unipd.it/en/node/622)
In permeabilized human neutrophils, inositol 1,4,5-trisphosphate released calcium from an ATP-dependent non-mitochondrial pool within 2 seconds while leaving mitochondria unaffected, supporting IP3 as the second messenger of intracellular calcium mobilization.[12](https://doi.org/10.1016/s0021-9258(18)89813-1) A 1993 *Science* paper then demonstrated that microdomains of high calcium close to IP3-sensitive channels in the endoplasmic reticulum membrane are sensed by neighboring mitochondria,[9](https://pmc.ncbi.nlm.nih.gov/articles/PMC9677533/) and, according to a memorial article by the Academia Europaea Cardiff Knowledge Hub, a 1998 *Science* paper, cited more than 2,000 times, showed that close contacts with the ER determine mitochondrial calcium responses.[4](https://aecardiffknowledgehub.wales/2022/10/17/in-memoriam-tullio-pozzan-1949-2022/)
## Career at Padova, CNR and VIMM
The Royal Society records his nomination as full Professor in 1986 and 12 years as department chairman at the [University of Padua](https://www.edgepedia.org/university-of-padua);[2](https://royalsociety.org/people/tullio-pozzan-13833/) a lecture biography states the 1986 chair was at the University of Ferrara, with a return to Padova in 1990.[13](https://www.fondazioneadrianobuzzatitraverso.it/8th-arturo-falaschi-lecture/) He directed the Department of Experimental Biomedical Sciences from 1992 to 2003.[14](https://www.eurobioimaging-access.eu/news/death-of-professor-tullio-pozzan-an-eminent--italian-scientist-and-imaging-technology-developer-and-/) He led the CNR Institute of Neuroscience and subsequently the CNR Department of Biomedical Sciences,[3](https://lincei.it/it/notizie/il-socio-tullio-pozzan-emerito-di-patologia-generale-si-e-spento-il-15-ottobre) and was a founding member of the Veneto Institute of Molecular Medicine (VIMM),[8](https://www.vimm.it/en/people/founding-members/) where the Accademia dei Lincei records six years of service as scientific director.[3](https://lincei.it/it/notizie/il-socio-tullio-pozzan-emerito-di-patologia-generale-si-e-spento-il-15-ottobre) He retired as Emeritus Professor of General Pathology in the Department of Biomedical Sciences at Padova.[2](https://royalsociety.org/people/tullio-pozzan-13833/)
## Honors
According to the Academia Europaea profile of Pozzan, he was elected an EMBO Member in 1990,[5](https://people.embo.org/profile/tullio-pozzan) to the Academia Europaea in 1998, to the Accademia dei Lincei in 2001, and to the United States National Academy of Sciences in 2006, and was a member of the Royal Society of Canada and a Foreign Member of the Royal Society (2018).[6](https://www.ae-info.org/ae/User/Pozzan_Tullio)
## Disease links and late work
His laboratory characterized alterations in intracellular calcium handling, mitochondrial function, and brain network excitability in familial Alzheimer's disease models expressing presenilin 2 mutants,[11](https://biomed.unipd.it/en/node/622) work that Euro-BioImaging credits with helping reveal pathogenetic mechanisms of neurodegenerative diseases such as Alzheimer's.[14](https://www.eurobioimaging-access.eu/news/death-of-professor-tullio-pozzan-an-eminent--italian-scientist-and-imaging-technology-developer-and-/) His CNR record lists a 2021 paper describing a new transgenic mouse line for imaging mitochondrial calcium signals and a 2023 paper in which the calcium sensor STIM1 rescued astrocyte activity, restoring long-term synaptic plasticity in female mice modeling Alzheimer's disease.[15](https://iris.cnr.it/cris/rp/rp20763) Shortly before his death he was developing new tools for measuring mitochondrial calcium in vivo.[1](https://doi.org/10.6084/m9.figshare.c.8440765)
## Death and legacy
Pozzan died on the afternoon of 15 October 2022.[3](https://lincei.it/it/notizie/il-socio-tullio-pozzan-emerito-di-patologia-generale-si-e-spento-il-15-ottobre) The University of Padova's Department of Biomedical Sciences established the Tullio Pozzan Memorial Lecture, first held on 18 October 2024 in the Aula Magna G.F. Azzone, with a lecture on cAMP compartmentation by a [University of Oxford](https://www.edgepedia.org/university-of-oxford) researcher.[16](https://www.biomed.unipd.it/tullio-pozzan-memorial-lecture-2024)
## References
1. Supplementary material from "Tullio Pozzan. 22 February 1949–15 October 2022" (Royal Society biographical memoir), https://doi.org/10.6084/m9.figshare.c.8440765
2. Professor Tullio Pozzan ForMemRS | Royal Society, https://royalsociety.org/people/tullio-pozzan-13833/
3. Il Socio Tullio Pozzan, emerito di Patologia generale, si è spento il 15 ottobre | Accademia dei Lincei, https://lincei.it/it/notizie/il-socio-tullio-pozzan-emerito-di-patologia-generale-si-e-spento-il-15-ottobre
4. In Memoriam: Tullio Pozzan (1949–2022) | Academia Europaea Cardiff Knowledge Hub, https://aecardiffknowledgehub.wales/2022/10/17/in-memoriam-tullio-pozzan-1949-2022/
5. Tullio Pozzan | EMBO Members profile, https://people.embo.org/profile/tullio-pozzan
6. Academy of Europe: Pozzan Tullio, https://www.ae-info.org/ae/User/Pozzan_Tullio
7. Rapid changes of mitochondrial Ca2+ revealed by specifically targeted recombinant aequorin (*Nature*, 1992), https://doi.org/10.1038/358325a0
8. Founding members | VIMM, https://www.vimm.it/en/people/founding-members/
9. The Song of the Earth (biographical memoir, PMC), https://pmc.ncbi.nlm.nih.gov/articles/PMC9677533/
10. Subcellular imaging of intramitochondrial Ca2+ with recombinant targeted aequorin (*PNAS*, 1996), https://www.pnas.org/doi/abs/10.1073/pnas.93.11.5489
11. Ca2+ and cAMP signalling in physiology and pathology | Università di Padova, https://biomed.unipd.it/en/node/622
12. https://doi.org/10.1016/s0021-9258(18)89813-1
13. 8th Arturo Falaschi Lecture | Fondazione Adriano Buzzati-Traverso, https://www.fondazioneadrianobuzzatitraverso.it/8th-arturo-falaschi-lecture/
14. Death of Professor Tullio Pozzan | Euro-BioImaging, https://www.eurobioimaging-access.eu/news/death-of-professor-tullio-pozzan-an-eminent--italian-scientist-and-imaging-technology-developer-and-/
15. POZZAN, TULLIO, CNR researcher profile, https://iris.cnr.it/cris/rp/rp20763
16. Tullio Pozzan Memorial Lecture 2024 | Università di Padova, https://www.biomed.unipd.it/tullio-pozzan-memorial-lecture-2024
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*Topic: Encyclopedia › Life and health › Life and health scientists › Life scientists › Researchers in molecular and cell biology › Molecular biology of the cell / cell signaling › Second messenger and calcium signaling researchers*
*Initially written Sep 21, 2026 · Reviewed: Sep 25, 2026; Sep 30, 2026 · Edited: Sep 25, 2026; Oct 12, 2026; Oct 15, 2026 · Last review: Sep 30, 2026*
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