Imperial College London

Dr Josefin Ahnström

Faculty of MedicineDepartment of Immunology and Inflammation

Senior Lecturer in Haematology



+44 (0)20 3313 4236j.ahnstrom




5S5Commonwealth BuildingHammersmith Campus





Dr Josefin Ahnström is a Senior Lecturer in Haematology in the Centre for Haematology.

She obtained an MSc in Pharmaceutical sciences from Uppsala University, Sweden. In 2009 she was awarded her PhD from Lund University after performing structural and functional studies on apolipoprotein M in Professor Björn Dahlbäck's lab. Following on from her PhD, Josefin joined the Thrombosis and Haemostasis group, led by Professor David Lane and Professor James Crawley, at the Centre for Haematology at Imperial College as a post-doc in September 2009. During her post-doc, she developed an interest in the molecular mechanisms involved in the regulation of coagulation. In 2013 she was awarded a BHF-funded Intermediate Basic Science Research Fellowship and was appointed as a Lecturer in October 2019 and promoted to Senior Lecturer in September 2022.

Throughout her career at Imperial College, Josefin’s research interests have continued to focus around structural and functional studies of various coagulation proteins. Her main focus is related regulation of coagulation through the three anticoagulant pathways, with a particular focus on the tissue factor pathway inhibitor (TFPI) and activated protein C (APC) pathways. Through this research, Josefin is investigating how the various components of these pathways are associated with thrombotic risk and their suitability as therapeutic targets when preventing bleeding or thrombosis.

Further details on Josefin’s research are available from the Haemostasis Lab Homepage

Josefin also teaches in several courses at Imperial College London and is the Module 1 lead in the BSc in Haematology. She is also involved in outreach programmes, including being a registered STEM ambassador and acting as a scientific advisor in the “Invisible warrior – sickle cell disease” project. In these programmes, Josefin visits schools where she talks about her career as a scientist and is passionate about encouraging girls to pursue a career in STEM.  

Josefin is also since 2017 a committee member of the British Society for Haemostasis and Thrombosis. 




Gierula M, Noakes VM, Salles-Crawley I, et al., 2023, The TFPIα C-terminal tail is essential for TFPIα-FV-short-protein S complex formation and synergistic enhancement of TFPIα, Journal of Thrombosis and Haemostasis, ISSN:1538-7836

Minns AF, Qi Y, Yamamoto K, et al., 2023, The C-terminal domains of ADAMTS1 contain exosites involved in its proteoglycanase activity, Journal of Biological Chemistry, Vol:299, ISSN:0021-9258

Yamamoto K, Scavenius C, Meschis MM, et al., 2022, A top-down approach to uncover the hidden ligandome of low-density lipoprotein receptor-related protein 1 in cartilage, Matrix Biology, Vol:112, ISSN:0174-173X, Pages:190-218


Prince RE, Schaeper U, Aretz J, et al., 2022, SLN140 a Small Interfering RNA Targeting Protein S Improves Hemostasis Potency in Hemophilia, 64th Annual Meeting and Exposition of the American-Society-of-Hematology (ASH), AMER SOC HEMATOLOGY, Pages:1670-1671, ISSN:0006-4971

Eladnani RP, Schaeper U, Aretz J, et al., 2022, A GalNAc conjugated Small Interfering RNA Targeting Protein S Improves Hemostasis Potency in Hemophilia, E M H SWISS MEDICAL PUBLISHERS LTD, Pages:2S-2S, ISSN:1424-7860

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