Blood Substitutes

Blood Substitutes

Donated blood is the safest and most effective treatment for patients with severe blood loss.  However, there are frequent shortages of rare blood types.  In addition, since red blood cells must be constantly refrigerated (never frozen), donated blood is frequently unavailable in remote areas (e.g. battlefields) that lack proper storage facilities.  These limitations have motivated the search for a “blood substitute” that can safely and effectively transport oxygen (the most important function of blood), be stored for long periods of time at high temperatures, and should preferably be a universal donor material. Most blood substitutes use human or cow hemoglobin as a starting material, since it is the main component of blood and an excellent oxygen carrier.  Unfortunately, those products ultimately failed clinical trials due to a variety of adverse side effects (see below). 

LtEc vs. HbA

The side effects observed previous blood substitutes can be attributed to the fact that human and cow hemoglobin are intracellular proteins that are designed to function within the protective environment of a red blood cell.  Therefore, a better approach may be to use one of the naturally extracellular hemoglobins (also known as erythrocruorins) found in most worms and some snails or clams.  For example, the erythrocruorin of the common earthworm Lumbricus terrestris (LtEc) has already been shown to have several adaptations (see above) that make it an attractive blood substitute, including: higher structural & thermal stability, slower oxidation rate, and a higher molecular weight (3,600,000 g/mol).  In fact, the unusually large size of LtEc allows us to easily purify large amounts of it using just ultrafiltration (500 kDa MWCO TFF).  Our preliminary studies show that the purified LtEc can be stored at high temperatures (37-50oC) for several days without any change in structure or function, suggesting that it could be deployed to remote areas.  In addition, our preliminary animal studies in both mice and hamsters have shown that LtEc safely delivers oxygen in these animals without causing the adverse side effects observed with human and cow hemoglobin-based blood substitutes.

National Heart, Lung, and Blood Institute


We sincerely thank the National Institutes of Health (NHLBI) for supporting our research!

NIH NHLBI R15 (AREA): Evaluation of Invertebrate Hemoglobins as Effective, Safe, and Ultra-Stable Blood Substitutes. 2017-2020, $432,392  1R15HL133880-01A1

 

Publications

Zimmerman D, DiIusto M, Dienes J, Abdulmalik O, Elmer JJDirect Comparison of Oligochaete Erythrocruorins as Potential Blood Substitutes.  Bioengineering & Translational Medicine. Accepted 18 June 2017.  DOI: 10.1002/btm2.10067

Muzzelo C, Neely C, Shah P, Abdulmalik O, Elmer JProlonging the shelf life of Lumbricus terrestris Erythrocruorin for use as a novel blood substitute  Artif Cells Nanomed Biotechnol. 2017 1:1-8.

Zimmerman D, Dienes J, Abdulmalik O, Elmer JPurification of diverse hemoglobins by metal salt precipitation. Protein Expr Purif.  2016 125:74-82.

Roth AD, Elmer J, Harris DR, Huntley J, Palmer AF, Nelson T, Johnson JK, Xue R, Lannutti JJ, Viapiano MS.  Hemoglobin regulates the migration of glioma cells along poly(e-caprolactone)-aligned nanofibers.  Biotechnol Prog. 2014 30(5):1214-1220.

Elmer J, Palmer AF, Cabrales P.  Oxygen delivery during extreme anemia with ultra-pure earthworm hemoglobin.  Life Sci. 2012 91:852-859.

Elmer J, Zorc K, Rameez S, Zhou Y, Cabrales P, Palmer AF.  Hypervolemic infusion of Lumbricus terrestris erythrocruorin purified by tangential flow filtration. Transfusion.  2012 52:1729-1740.

Elmer J, Palmer AF.  Biophysical properties of Lumbricus terrestris Erythrocruorin and its potential use as a red blood cell substitute.  J Funct Biomater. 2012 3(1):49-60.

Elmer J, Cabrales P, Wang Q, Zhang N, Palmer AF.  Synthesis and biophysical properties of polymerized human serum albumin.  Biotechnol Prog. 2011 27(1):290-296.

Elmer J, Harris D, Palmer AF.  Purification of hemoglobin from red blood cells using tangential flow filtration and immobilized metal ion affinity chromatography.  J Chromatogr B: Analyt Technol Biomed Life Sci.  2011 879(2):131-138

Elmer J, Buehler PW, Jia Y, Wood F, Harris DR, Alayash AI, Palmer AF.  Functional comparison of hemoglobin purified by different methods and their biophysical implications.  Biotechnol Bioeng. 2010 106(1):76-85.

Elmer J, Harris DR, Sun G, Palmer AF.  Purification of hemoglobin by tangential flow filtration with diafiltration.  Biotechnol Prog. 2009 25(5):1402-1410.

Director

Jacob J. Elmer, Ph.D.

Jacob J. Elmer, Ph.D.
Department of Chemical Engineering
Email: jacob.elmer@villanova.edu
Phone: 610-519-3093