Abstract
Over the last 40 years International Orthopaedics has published a series of articles on bone morphogenetic proteins (BMPs) covering topics from basic research to clinical applications. This includes also work submitted from the Laboratory for Mineralized Tissues of the School of Medicine University of Zagreb. Accordingly, we felt obliged to give a short summary of Dr. Urist’s life and work as our gratitude to his discovery that demineralized bone matrix (DBM) activity induces bone when implanted ectopically into the muscle or under the skin due to bone inducing proteins, named BMPs.
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Dr. Marshall R. Urist was born in Chicago on June 11, 1914 and grew up on a small farm in South Haven, Michigan. He received his undergraduate degree in chemistry from the University of Michigan and, after earning a master’s degree at the University of Chicago, entered the Johns Hopkins University School of Medicine, receiving his medical degree in 1941. He completed his surgical residency at Johns Hopkins and at Massachusetts General Hospital (MGH). Urist joined the war in 1943 as Chief of Orthopaedics in the 22nd General Hospital Division in England, and the 97th General Hospital Division in Germany. After resigning from the military, he became a senior resident at MGH and completed his training with a fellowship in orthopaedic surgery at Children’s Hospital in Boston, where he worked on the management of poliomyelitis. In 1947, he moved to Chicago to resume his collaboration with Franklin McLean at the Department of Physiology and Research. His experiments focused on osteoporosis and hormone regulation of bone homeostasis [2]. In 1948, he joined the faculty of the new School of Medicine at the University of California at Los Angeles as an Assistant Professor of Surgery. He was promoted to Associate Professor in 1954 and to Professor of Surgery, Orthopaedics in 1969. He died at his home on February 4, 2001, in Los Angeles [4].
Dr. Urist’s areas of interest include bone and joint biology, bone morphogenetic proteins, calcium metabolism, bone grafts, oestrogens and bone metabolism. He contributed to the discipline of orthopaedic surgery in many ways but the main contribution was his interest in basic research [23]. With grants from a private foundation, he set up the Bone Research Laboratory in Wilshire.
Bone regeneration was the main concern of Dr. Urist since his graduation when he read the book by Leriche and Policard where authors mentioned “the juice of stonemaking” which generates bone in muscle [2]. The phenomenon of heterotopic bone formation was best described in experiments performed by Charles Huggins (1929–1931) on the uroepithelial tissue in dogs. Huggins was awarded the 1966 Nobel Prize for Physiology or Medicine for his discovery that hormones could be used to control the spread of some cancers. This was the first discovery that cancer could be controlled by chemicals [14, 15].
In 1965, Dr. Urist showed that new bone formation could be induced by DBM implanted under the skin or into the muscle of animals [29]. With these studies, Dr. Urist pioneered the concept of substance naturally present in bone, responsible for the regeneration and bone repair activity. He called this substance the bone inductive principle BMP, bone morphogenetic protein, introducing the new term to describe the nature of this bone inductive factor and initiated a search for these molecules [30]. He spent the next three decades isolating and purifying BMP molecules. Throughout the 1970s, pre-clinical research in Dr. Urist’s laboratory demonstrated the involvement of BMP in the bone formation cascade of mitosis, chemotaxis, differentiation, callus and bone formation (endochondral and intramembranous). The advances in molecular biology in the 1980s and early 1990s allowed the sequencing and cloning of BMPs. Cloned for the first time in 1988 by a research team at the Genetics Institute led by Dr. John Wozney, BMP proved to be a member of the TGF-beta superfamily of cytokines [40]. The first publications on the clinical use of BMP in non-unions and segmental bone defects began in the late 1980s by Johnson et al. [16] in tibial defects. Dr. Urist’s work resulted in the publication of over 400 papers and the presentations of more than 200 lectures throughout the world. Availability of rhBMPs permitted the large scale evaluation of their efficacy and safety in a large number of animal models, thus allowing for optimization of both carrier and dose of BMPs for clinical use [6, 8–11, 13, 17, 19, 21, 22, 24, 27, 38].
Native BMPs were tested in clinical trials under Dr. Urist’s supervision at the University of California at Los Angeles (UCLA) where patients with difficult non-unions and bone defects were successfully treated.
We had an opportunity to personally interact (Fig. 1) and exchange ideas regarding heterotopic ossification with Dr. Urist. The first contact was established in 1983 when Prof. Vukicevic contacted Dr. Urist regarding the discovery of heterotopic ossification in the anterior abdominal wall of a cadaver found during an anatomical dissection, a case report published in Plastic and Reconstructive Surgery [39]. The paper reported on a membranous bone transplant found in the anterior abdominal wall of an 82-year-old man. Histological and bone mineral content analyses revealed that bone graft underwent little bone resorption and induced new bone formation and that it represented a parietal skull bone removed following benign brain tumor surgery and implanted into the abdominal wall for a delayed skull closure [39]. Dr. Urist kindly replied to the letter, gave useful advice and shared some of his experience associated with heterotopic ossification. In the letter Dr. Urist mentioned that he was working with bone morphogenetic proteins (Fig. 2), which in time became the main research interest of Professor Vukicevic and his scientific team as well as many international collaborators.
Dr. Vukicevic and Dr. Pecina explored the mechanisms and function of BMPs in patients with non-unions [3, 7, 20, 21, 26, 31–33, 37], and Dr. Grgurevic made important contributions to understanding the role of circulating BMPs that led to the use of BMP6 locally in patients with bone defects [1, 26, 32–34]. With numerous collaborators they published important discoveries and organized international BMP conferences (Figs. 3 and 4).
Dr. Urist was a distinguished leader and his contributions as a scientist, surgeon, clinician, writer and editor are legendary. He trained and mentored hundreds of young medical residents, fellows and researchers, and his bone laboratory became a centre of scientific and intellectual exchange. Dr. Urist won numerous academic honours, including two kappa Delta awards for his work on oestrogen effects on bone and work on BMPs. The First International Conference on BMP was also held at Johns Hopkins University in 1994 to honour Dr. Urist. In 1991, professor Ian Goldie nominated Dr. Urist for the Nobel Prize in Physiology or Medicine which was based on his early work on bone physiology and the discovery of bone formation, BMPs and his clinical research in orthopaedics.
The research area of BMPs has significantly expanded in the past two decades and covered many areas but has primarily remained in the field of bone regeneration. The foundation that Dr. Urist set by the discovery of BMPs provided a good basis for further preclinical research and development of new bone regeneration products by taking advantage of the basic characteristics of BMPs as a potent bone-forming agent in vivo, with the ability of restoring bone loss in postnatal life by recapitulation of events that are similar to those in the embryonic development. BMPs are members of the TGF beta superfamily and have diverse roles in development, repair and regeneration [34–37]. BMP2 and BMP7 have been most studied in the context of bone healing [5, 9, 28]. Two therapeutic concepts have been introduced to the market to overcome bone non-healing or complicated bone fractures consisting of bovine collagen as a carrier which is soaked with BMP2 (Infuse Bone Graft) or BMP7 (Osigraft) [8, 18, 33]. BMP2 has received approval for several clinical indications (open tibial shaft fractures and anterior fusion of the lumbar spine in patients with degenerative disc disease [DDD]). Due to serious side effects of BMP2 [12, 25] there is still a need to develop safer and more effective therapies for bone regeneration. In order to avoid the occurrence of side effects and limitations which include ectopic ossification outside the bone compartment, oedema, inflammation, bovine collagen as a BMP carrier, and a high product price, new therapeutic concepts are being developed and tested in a large number of preclinical animal models. OSTEOGROW is a new bone device consisting of BMP6 and a biocompatible blood coagulum-derived carrier currently tested in Phase I/II clinical testing in patients with high tibial osteotomy (HTO) and distal radius fracture (DRF) in three European countries. The first safety report after completion of Phase II in patients with HTO indicate that no serious side effects have been reported [33, 34].
The existence of a link between the founder and those who learn from him proved to be in accordance with the metaphor: standing on the shoulders of giants (Latin: nanos gigantum humeris insidentes) expressing the meaning of “discovering truth by building on previous discoveries”. The concept has been traced to the 12th century, attributed to Bernard of Chartres [11]. The future of BMPs as regulators of almost all developmental and postnatal events provides a platform for future discoveries on segmental bone healing and systemic bone biology [34].
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MP declares no conflict of interest. LG is employed by the School of Medicine, University of Zagreb and is actively involved in the development and clinical testing of Osteogrow, a new BMP6 therapeutic implant for bone regeneration. SV is employed by the School of Medicine, University of Zagreb and is the founder of Genera Research, a Croatian biotechnology company conducting clinical trials with Osteogrow.
The Osteogrow program is funded by the EU Commission for science (FP7 Health, Grant agreement no: 279239).
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Grgurevic, L., Pecina, M. & Vukicevic, S. Marshall R. Urist and the discovery of bone morphogenetic proteins. International Orthopaedics (SICOT) 41, 1065–1069 (2017). https://doi.org/10.1007/s00264-017-3402-9
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DOI: https://doi.org/10.1007/s00264-017-3402-9