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Hematopoietic Stem Ceil Transplantation<br />

of Systemic Lupus Erythematosus,<br />

Rheumatoid Arthritis, <strong>and</strong> Multiple Sclerosis<br />

Richard K Burt, Jakub Stefka, Dong Cheng,<br />

Alex<strong>and</strong>ra Roginsky, Steven Rosen, Ann Traynor<br />

Northwestern University <strong>and</strong> The Robert H Lurie Cancer Center, Chicago, IL<br />

INTRODUCTION<br />

Hematopoietic stem cell <strong>transplantation</strong> (HSCT) is being used as a treatment for<br />

severe autoimmune diseases (SADS). 1<br />

^* Although this approach remains experimental<br />

<strong>and</strong> unproven, results from phase I trials are encouraging. 5-11<br />

Besides being a potential<br />

therapy for patients with high-risk autoimmune diseases, HSCT offers an opportunity<br />

to study mechanisms of tolerance <strong>and</strong> autoimmunity. Initial studies on hematopoietic<br />

stem cell therapy for autoimmune diseases began in animal models. 12-21<br />

These models<br />

continue to provide tools to analyze immunity <strong>and</strong> tolerance.<br />

RELAPSING EXPERIMENTAL AUTOIMMUNE ENCEPHALOMYELITIS (R-EAE)<br />

R-EAE is an inflammatory demyelinating disease of the central nervous system<br />

(CNS) initiated by CD4 +<br />

T lymphocytes. 22<br />

Affected animals have a relapsingremitting<br />

course that is clinically <strong>and</strong> histologically similar to relapsing-remitting<br />

multiple sclerosis. Disease is initiated by active immunization with myelin peptides<br />

homogenized in complete Freund's adjuvant or by adoptive transfer of<br />

lymphocytes from immunized mice. R-EAE is an autoimmune disease that can be<br />

induced in a wide variety of species including mice, rats, guinea, pigs, monkeys,<br />

<strong>and</strong> even humans. The relapsing-remitting course suggests that the immune system<br />

is not static but dynamic, with wide fluctuations in regulation of autoreactive<br />

clones. Disease progression is accompanied by an orderly recruitment of clones<br />

responsive to new myelin epitopes. 23,24<br />

The most prevalent myelin protein is<br />

proteolipid protein (PLP). If disease is initiated to PLP 139-151 epitope, during<br />

each relapse lymphocytes become responsive to other myelin epitopes including<br />

PLP 178-191 as well as determinants in myelin basic protein (MBP), another<br />

protein within the lipid bilayer of myelin.<br />

Syngeneic <strong>transplantation</strong> of the <strong>marrow</strong> from a normal mouse resulted in<br />

marked improvement in the neurologic disability <strong>and</strong> histology of mice with R-<br />

464

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