An enzymatic method to rescue mesenchymal stem cells from clotted bone marrow samples.
Mesenchymal stem cells (MSCs) - usually obtained from bone marrow - often require expansion culture. Our protocol uses clinical grade urokinase to degrade clots in the bone marrow and release MSCs for further use. This protocol provides a rapid and inexpensive alternative to bone marrow resampling. Bone marrow is a major source of MSCs, which are interesting for tissue engineering and autologous stem cell therapies. Upon withdrawal bone marrow may clot, as it comprises all of the hematopoietic system. The resulting clots contain also MSCs that are lost for expansion culture or direct stem cell therapy. We experienced that 74% of canine bone marrow samples contained clots and yielded less than half of the stem cell number expected from unclotted samples. Thus, we developed a protocol for enzymatic digestion of those clots to avoid labor-intense and costly bone marrow resampling. Urokinase - a clinically approved and readily available thrombolytic drug - clears away the bone marrow clots almost completely. As a consequence, treated bone marrow aspirates yield similar numbers of MSCs as unclotted samples. Also, after urokinase treatment the cells kept their metabolic activity and the ability to differentiate into chondrogenic, osteogenic and adipogenic lineages. Our protocol salvages clotted blood and bone marrow samples without affecting the quality of the cells. This obsoletes resampling, considerably reduces sampling costs and enables the use of clotted samples for research or therapy.
Swiss Paraplegic Research.
Philipp
P
Schlaefli
Swiss Paraplegic Research.
Alessandro
A
Bertolo
Swiss Paraplegic Research.
Cherry
C
Malonzo
Orthopaedics and Spinal Surgery, Swiss Paraplegic Centre.
Tobias
T
Poetzel
Department of Neurosurgery, Lucerne Cantonal Hospital (LUKS).
Martin
M
Baur
Section of Small Animal Surgery/Neurology, Vetsuisse Faculty, University of Zurich.
Frank
F
Steffen
Swiss Paraplegic Research; jivko.stoyanov@paraplegie.ch.
Jivko
J
Stoyanov
D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology*; D018929:Cell Culture Techniques; D002454:Cell Differentiation / Q000502:physiology; D004285:Dogs; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D023822:Tissue Engineering; D014568:Urokinase-Type Plasminogen Activator / Q000737:chemistry*
D014568:Urokinase-Type Plasminogen Activator