Projects per year
Personal profile
Biography
Discovering a new biological universe
Professor Robert Medcalf is deeply interested in fibrinolysis - the process our bodies implement to remove blood clots. He is investigating how we can use our natural clot busting mechanisms to help treat stroke victims. His interest in the chemicals in our bodies that can help reduce the long-term damage of stroke and also in other diseases of the brain including traumatic brain injury.
Fibrinolysis gets its name from a protein called fibrin which gives a blood clot its physical texture.
'A lot of the time, we need to [form clots] because we hurt ourselves,' Robert explains. 'That's just normal, but as we get older, our blood vessels start decaying to some extent, and blood clots start forming at sites which are inappropriate, because it's viewed [by our body] as a wound. Then you're in all sorts of trouble - strokes, heart attacks, deep vein thrombosis, and so on.'
To treat such ailments, doctors will often give megadoses of the body's natural clot removing enzyme, TPA - tissue plasminogen activator - to remove the clot. However, for stroke victims, TPA is only useful within a four and a half hour 'window' after stroke onset. This severely limits the scope of treatment. and part of Robert's work is to try to extend this window.
'If you get to the hospital early enough, TPA is good. After that, it becomes precarious. We've been looking into lengthening the time line by which doctors can still administer TPA. Some trials are going to six hours, and others are going to nine hours. At those kinds of rates, rather than a 15 per cent chance, you would start having a 20 to 25 per cent chance of doctors treating you with TPA, maybe even more. That's a tremendous improvement.'
However, TPA may have applications beyond its role as a stroke-treatment agent. Indeed, Robert suggests that clot busting may be TPA's secondary purpose.
'TPA can influence the permeability of the blood-brain barrier. It's very important in memory formation and plasticity on learning . It even acts as a neurotransmitter. [It's capable of] all sorts of surprising things.'
To understand the effects and value of TPA better, Robert is extending his research beyond human physiology - and to that of Desmodus rotundus: the common vampire bat.
'There's this TPA molecule derived from the vampire bat that has no damaging brain effect whatsoever - at least in preliminary tests - and this has offered some interesting possibilities for stroke treatment.
"We are also very interested in applying our knowledge to see how t-PA is influencing other brain conditions, including traumatic brain injury, epilepsy and even in multiple sclerosis. It is a very exciting time to be in research"
Research area keywords
- Fibrinolysis
- Haematology
- Stroke
- Traumatic Brain Injury (TBI)
Network
Recent external collaboration on country level. Dive into details by clicking on the dots.
Projects
Improving the safety and predictable efficacy of thrombolytic therapy in acute ischaemic stroke
Medcalf, R., Boyd, B. & Cloud, G.
1/01/19 → 31/12/22
Project: Research
Targeted delivery of CD39 to the ischaemic brain improves outcomes in stroke
Nandurkar, H., Medcalf, R., Wong, C. & Robson, S. C.
National Health & Medical Research Council (NHMRC)
1/01/18 → 31/12/21
Project: Research
NHMRC Equipment Grant - Quanterix SIMOA HD-1 Analyser
Shultz, S., Kwan, P., Medcalf, R., O'Brien, T., Mitra, B., Coughlan, M., Jones, N., Van Der Walt, A., Butzkueven, H., Semple, B. & Hutton, E.
Monash University – Internal Department Contribution, Monash University – Internal Faculty Contribution, Novartis Pharmaceuticals Australia Ltd
1/01/19 → 31/12/19
Project: Research
Research Output
Defining trauma-induced coagulopathy with respect to future implications for patient management: Communication from the SSC of the ISTH
Moore, H. B., Gando, S., Iba, T., Kim, P. Y., Yeh, C. H., Brohi, K., Hunt, B. J., Levy, J. H., Draxler, D. F., Stanworth, S., Görlinger, K., Neal, M. D., Schreiber, M. A., Barrett, C. D., Medcalf, R. L., Moore, E. E., Mutch, N. J., Thachil, J., Urano, T., Thomas, S. & 3 others, , 1 Mar 2020, In : Journal of Thrombosis and Haemostasis. 18, 3, p. 740-747 8 p.Research output: Contribution to journal › Article › Other › peer-review
Editorial: Fibrinolysis in Immunity
Kolev, K. & Medcalf, R. L., 31 Mar 2020, In : Frontiers in Immunology. 11, 2 p., 582.Research output: Contribution to journal › Editorial › Other › peer-review
Open Access
Fibrinolysis and the Immune Response in Trauma
Medcalf, R. L., Keragala, C. B. & Draxler, D. F., 1 Mar 2020, In : Seminars in Thrombosis and Hemostasis. 46, 2, p. 176-182 7 p.Research output: Contribution to journal › Review Article › Other › peer-review
1
Citation
(Scopus)
Fibrinolysis and tranexamic acid: mechanistic principles
Draxler, D. F. & Medcalf, R. L., 1 Apr 2020, In : ANZ Journal of Surgery. 90, 4, p. 410-411 2 p.Research output: Contribution to journal › Comment / Debate › Other › peer-review
Open Access
1
Citation
(Scopus)
The Complexity of Trauma-Induced Coagulopathy
Moore, H. B., Walsh, M., Kwaan, H. C. & Medcalf, R. L., 1 Mar 2020, In : Seminars in Thrombosis and Hemostasis. 46, 2, p. 114-115 2 p.Research output: Contribution to journal › Editorial › Other › peer-review