Kai Simons

Kai Simons
Born (1938-05-24) 24 May 1938
Helsinki
Residence Germany
Nationality finnish
Fields biochemistry, cell biology
Institutions Rockefeller University, University of Helsinki, EMBL, MPI-CBG, Lipotype GmbH
Education University of Helsinki (PhD), Rockefeller University (postdoctoral fellowship)
Known for lipid rafts, trans-Golgi network
Spouse Carola Simons
Children Mikael, Katja, Matias
Website
http://www.lipotype.com

Kai Simons (born 24 May 1938) is a Finnish professor of biochemistry and cell biology living and working in Germany. Author of the concept of lipid rafts[1] coined also the term trans-Golgi network and proposed its role in protein and lipid sorting,[2] Co-founder and co-organizer of EMBO, ELSO, initiated the foundation of MPI-CBG,[3] where he acted as a director (1998-2006) and a group-leader (until 2012).[4][5] Co-founder and co-owner of Lipotype GmbH.[6]

Biography

Kai Simons is a son of physics professor. It was his father, who convinced him to study medicine, however in the beginning Simons wanted to study physics.[3] While studying in University of Helsinki, Simons spent a summer internship in Stockholm laboratory of Bengt Samuelsson[7] Simons worked there on mechanisms of vitamin B12 absorption[3] In his student's years together with fellow students he organized anti-taeniasis campaign, the disease common in the eastern Finland where eating raw fish is popular.[7]

After completing his PhD in medicine in 1964, he began a postdoctoral fellowship at Rockefeller University in New York where he worked between 1966 and 1967 on blood serum protein polymorphism[3] He came back to Helsinki in 1967, where he started to work as a Junior Investigator for the Finnish Medical Research Council at the University of Helsinki.[7][8] He became a group leader in 1972 and was a biochemistry professor in 1971-79 at the medical faculty of this university[8] In the beginning he continued his work on serum proteins. Next, together with Leevi Kääriäinen and Ossi Renkonen, he started a research team - later joined by Ari Helenius, his first PhD student and later a post doctoral researcher who became Simons' brother-in-law. After one-month stay in MRC Laboratory for Molecular Biology in Cambridge, the group started investigating a Semliki forest virus, introduced to Simons by Kääriäinenem.[3]

In 1975 Simons came to Heidelberg (Germany), as one of the EMBL group leaders. Together with Ari Helenius he helped to develop EMBL, headed at this time by John Kendrew.[3] In years 1982-1998 Simons was a coordinator of the Cell Biology Programm there.[8] During this time he for the first time presented the concept of lipid rafts.

In 1999 he took part in setting up ELSO (later incorporated into EMBO), which later he presided over.[9]

He was one of the initiators of establishing and building Max Planck Institute of Molecular Cell Biology and Genetics in Dresden (Germany), where he moved. Formally from 1998 (beginning of MPI-CBG construction) and practically from 2000 he was one of five institute's directors and also a group leader there[4][5] Since 2006 he is a director emeritus.[4]

In 2012 he started-up a biotech company Lipotype GmbH, where he is a CEO.[6]

He is married to Carola Simons and a father of three: twins - Mikael (neurobiologist) and Katja (sociologist and spatial planning), and the youngest of three, Matias (physician).[7]

Work

In the beginning Kai Simons pursuited research in the field of medical biochemistry and his master's thesis as well as PhD focused on vitamin B12 absorption.[3][10][11] After returning from his post-doc scholarship he continued research on vitamin B12 as well as on blood plasma proteins, but soon started investigating Semliki Forest Virus, focusing on its membrane and its lipid composition and their role in the virus budding and its transport, as the model for lipid and protein secretion.[3][12][13][14][15] During this period, Simons also investigated the application of detergents in biochemistry with a special attention to their role in biological membrane research.[16]

The virus lifecycle and how it uses components of vesicular pathways while shuttling to the cell surface, turned Simons' attention toward vesicular transport pathways and cell polarization. Applying epithelial model cells - MDCK (Madin-Darby canine kidney), he investigated lipid transport, protein sorting and their role in polarizing cells.[3][17][18]

During these studies he described the role of trans-Golgi network (TGN) in protein and lipid sorting according to their destination.[2][3] In his works from 1988, together with Gerit van Meer,[19][20] Simons for the first time postulated the existence of lipid microdomains in cell membranes.[3] Such microdomains differ in their composition from the surrounding membrane and have special functions. Simons termed these microdomains as lipid rafts. This concept was developed over the years to be presented more fully in 1997 in Nature journal by Simons and Ikonen.[1] This paper became on of the most frequently cited works in the field of membrane research. Other Simons' paper, on role of lipid rafts in the signal transduction[21] is second highest cited work and Simons is fourth highest cited scientist in the field of signal transduction. Kai Simons was also recognized by ISI Web of Knowledge, as one of the most cited scientist ever.

In next years, Simons continued to work on the role of lipid rafts, and more generally lipids, in cell polarization and protein sorting.[22] He was interested also in the role of lipids and protein sorting in neurodegenerative diseases, especially in Alzheimer's disease.[23][24]

His scientific record includes more than 350 scientific articles, mostly in the field of biochemistry, molecular organization of the cell, and biochemistry and physiology of a cell membrane.

Considering his work from years 1996-2007 tracked until May 2009, Simons was 12. in the list of the most frequently cited scientists in the field cell biology with 90 articles and 16 299 citations.[25]

Honours and awards

Kai Simons honours and awards include:[8][26]

Kai Simons was and is also a member of numerous societies, committees and organisations, as well as an editor for several scientific journals.[8]

References

  1. 1 2 Simons K, Ikonen E (1997). "Functional rafts in cell membranes". Nature. 387 (6633): 569–72. doi:10.1038/42408. PMID 9177342.
  2. 1 2 Griffiths G, Simons K (1986). "The trans Golgi network: sorting at the exit site of the Golgi complex". Science. 234 (4775): 438–43. PMID 2945253.
  3. 1 2 3 4 5 6 7 8 9 10 11 Simons, Kai (2008-12-29). "Kai Simons: membrane master". The Journal of Cell Biology. 183 (7): 1180–1181. doi:10.1083/jcb.1837pi. ISSN 1540-8140. PMC 2606959Freely accessible. PMID 19114590.
  4. 1 2 3 "MPI-CBG: Directors". Max Planck Institute of Molecular Cell Biology and Genetics. Retrieved 2016-07-26.
  5. 1 2 "MPI-CBG: Alumni". Max Planck Institute of Molecular Cell Biology and Genetics. Retrieved 2016-07-26.
  6. 1 2 "Everything you should know ABOUT US". Lipotype GmbH. Retrieved 2016-07-26.
  7. 1 2 3 4 "ASCB Members Profile Archives - Kai Simons". The American Society for Cell Biology. 2009-08-13. Archived from the original on 2007-07-15. Retrieved 2016-07-27.
  8. 1 2 3 4 5 "Kai Simons". MPI CBG Research Group -: Group Leader. Max Planck Institute of Molecular Cell Biology and Genetics. Retrieved 2016-07-28.
  9. ↑ Gransalke, Kathleen (2014). "There Are No Easy Solutions" (PDF). Lab Times. 4: 34–37. ISSN 1864-2381. Retrieved 2016-07-27.
  10. ↑ Grasbeck, R.; Runeberg, L.; Simons, K. (1959-12-12). "Intrinsic factor and radiovitamin B12 excretion in rats". Acta Physiologica Scandinavica. 47: 370–374. ISSN 0001-6772. PMID 13828995.
  11. ↑ Grasbeck, R.; Simons, K.; Sinkkonen, I. (1962-01-01). "Purification of intrinsic factor and vitamin B12 binders from human gastric juice". Annales Medicinae Experimentalis Et Biologiae Fenniae. 40(Suppl 6): 1–24. ISSN 0003-4479. PMID 13949889.
  12. ↑ Renkonen O, Gahmberg CG, Kaariainen L, Simons K (1972). "Envelope of Semliki Forest virus as membrane model". Biochem. J. 128 (1): 20P–21P. PMC 1173622Freely accessible. PMID 5085567.
  13. ↑ Renkonen O, Kääriäinen L, Gahmberg CG, Simons K (1972). "Lipids of Semliki Forest virus and of host cell membranes". Biochem. Soc. Symp. (35): 407–22. PMID 4614812.
  14. ↑ Simons K, Garoff H (1980). "The budding mechanisms of enveloped animal viruses". J. Gen. Virol. 50 (1): 1–21. doi:10.1099/0022-1317-50-1-1. PMID 6255080.
  15. ↑ Simons K, Warren G (1984). "Semliki Forest virus: a probe for membrane traffic in the animal cell". Adv. Protein Chem. 36: 79–132. PMID 6382965.
  16. ↑ Helenius A, Simons K (1975). "Solubilization of membranes by detergents". Biochim. Biophys. Acta. 415 (1): 29–79. PMID 1091302.
  17. ↑ Simons K, Fuller SD (1985). "Cell surface polarity in epithelia". Annu. Rev. Cell Biol. 1: 243–88. doi:10.1146/annurev.cb.01.110185.001331. PMID 3939606.
  18. ↑ Simons K (1987). "Membrane traffic in an epithelial cell line derived from the dog kidney". Kidney Int. Suppl. 23: S201–10. PMID 2831424.
  19. ↑ van Meer G, Simons K (1988). "Lipid polarity and sorting in epithelial cells". J. Cell. Biochem. 36 (1): 51–8. doi:10.1002/jcb.240360106. PMID 3277985.
  20. ↑ Simons K, van Meer G (1988). "Lipid sorting in epithelial cells". Biochemistry. 27 (17): 6197–202. PMID 3064805.
  21. ↑ Simons, K.; Toomre, D. (2000-10-01). "Lipid rafts and signal transduction". Nature Reviews. Molecular Cell Biology. 1 (1): 31–39. doi:10.1038/35036052. ISSN 1471-0072. PMID 11413487.
  22. ↑ Klemm, Robin W.; Ejsing, Christer S.; Surma, Michal A.; Kaiser, Hermann-Josef; Gerl, Mathias J.; Sampaio, Julio L.; de Robillard, Quentin; Ferguson, Charles; Proszynski, Tomasz J. (2009-05-18). "Segregation of sphingolipids and sterols during formation of secretory vesicles at the trans-Golgi network". The Journal of Cell Biology. 185 (4): 601–612. doi:10.1083/jcb.200901145. ISSN 1540-8140. PMC 2711577Freely accessible. PMID 19433450.
  23. ↑ Rajendran, Lawrence; Honsho, Masanori; Zahn, Tobias R.; Keller, Patrick; Geiger, Kathrin D.; Verkade, Paul; Simons, Kai (2006-07-25). "Alzheimer's disease beta-amyloid peptides are released in association with exosomes". Proceedings of the National Academy of Sciences of the United States of America. 103 (30): 11172–11177. doi:10.1073/pnas.0603838103. ISSN 0027-8424. PMC 1544060Freely accessible. PMID 16837572.
  24. ↑ Rajendran, Lawrence; Schneider, Anja; Schlechtingen, Georg; Weidlich, Sebastian; Ries, Jonas; Braxmeier, Tobias; Schwille, Petra; Schulz, Jörg B.; Schroeder, Cornelia (2008-04-25). "Efficient inhibition of the Alzheimer's disease beta-secretase by membrane targeting". Science. 320 (5875): 520–523. doi:10.1126/science.1156609. ISSN 1095-9203. PMID 18436784.
  25. ↑ Neumann, Ralf (2009). "Publication Analysis 1996-2007. Cell Biology" (PDF). Lab Times. 5: 42–44. ISSN 1864-2381. Retrieved 2016-07-27.
  26. ↑ "Academy of Europe: Simons, Kai". Academia Europaea. Retrieved 2016-07-26.
  27. ↑ "Kai Simons. Robert Koch Gold Medal 2016". Robert Koch Gold Medal 2016. Robert-Koch-Stiftung. 2016. Retrieved 2016-07-26.
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