Publications

Publications

Enhanced Detection of Cancer Biomarkers in Blood-Borne Extracellular Vesicles Using Nanodroplets and Focused Ultrasound

Cancer Res. 2017 Jan 1;77(1):3-1

Paproski RJ, Jovel J, Wong GK, Lewis JD, Zemp RJ.

Abstract

The feasibility of personalized medicine approaches will be greatly improved by the development of noninvasive methods to interrogate tumor biology. Extracellular vesicles shed by solid tumors into the bloodstream have been under recent investigation as a source of tumor-derived biomarkers such as proteins and nucleic acids. We report here an approach using submicrometer perfluorobutane nanodroplets and focused ultrasound to enhance the release of extracellular vesicles from specific locations in tumors into the blood. The released extracellular vesicles were enumerated and characterized using micro flow cytometry. Only in the presence of nanodroplets could ultrasound release appreciable levels of tumor-derived vesicles into the blood. Sonication of HT1080-GFP tumors did not increase the number of circulating tumor cells or the metastatic burden in the tumor-bearing embryos. A variety of biological molecules were successfully detected in tumor-derived extracellular vesicles, including cancer-associated proteins, mRNAs, and miRNAs. Sonication of xenograft HT1080 fibrosarcoma tumors released extracellular vesicles that contained detectable RAC1 mRNA with the highly tumorigenic N92I mutation known to exist in HT1080 cells. Deep sequencing serum samples of embryos with sonicated tumors allowed the identification of an additional 13 known heterozygous mutations in HT1080 cells. Applying ultrasound to HT1080 tumors increased tumor-derived DNA in the serum by two orders of magnitude. This work is the first demonstration of enhanced extracellular vesicle release by ultrasound stimulation and suggests that nanodroplets/ultrasound offers promise for genetic profiling of tumor phenotype and aggressiveness by stimulating the release of extracellular vesicles.

PubMed

Download PDF

Stay Informed

To stay up to date on all the latest news and publications, subscribe to our newsletter!

Kaye Fund Awards: Congratulations to our APCaRI members!

University Hospital Foundation – Kaye Fund Awards

Congratulations to two APCaRI principal investigators; Dr. John Lewis and Dr. Frank Wuest for their 2018 Kaye Fund Awards! From an initial field of 80 applicants, 7 Kaye Fund Awards in total were given to medical researchers studying a diverse array of health-relevant topics of huge importance to Albertans and the rest of the world alike.

John Lewis’ project is titled “Improving the Management of Prostate Cancer Using Advanced Biofluid Diagnostics” and Frank Wuest’s project is “Novel Radiolabeled PSMA Inhibitors for Clinical PET Imaging of Prostate Cancer”. Both projects are poised to greatly improve prostate cancer diagnosis and treatment in the near future.

The University of Alberta Hospital (UAH), Kaye Edmonton Clinic (KEC) and the University Hospital Foundation (UHF) launched the Kaye Fund Competition in the fall of 2017. Recipients of this inaugural competition were announced July 4th, 2018. The Kaye Fund Competition aims to support individuals or collaborative, inter-disciplinary and multi-disciplinary teams in the pursuit of research, innovation and quality improvement projects that will establish new approaches to patient care.

The Kaye Fund Award is funded by a transformational $30 million donation from Mr. Donald Kaye. This gift is directed to advancing patient care and medical research to the Kaye Edmonton Clinic, and remains one of largest donations in the history of Canadian healthcare philanthropy.

Mr. Donald Kaye

Through his naming gift to the University Hospital Foundation, Donald Kaye has transformed years of hard work, prudent decision-making and wise investing into one of the largest donations in the history of Canadian healthcare philanthropy. And in doing so, Mr. Kaye is advancing patient care and medical research in a way that is both intently focused, and broadly based.  

 

 

- Perrin Beatty