Proteomics and Stem Cell Therapy as a New Vascularization Strategy
Status:
Unknown status
Trial end date:
2017-03-01
Target enrollment:
Participant gender:
Summary
Neovascularization (NV) is the innate capability to enlarge collateral arteries
("arteriogenesis"), and to stimulate growth of new capillaries, arterioles and venules at the
tissue level ("angiogenesis"). Patients with Chronic Limb-threatening Ischemia (CLI) present
with forefoot rest-pain, ulceration and/or gangrene. They require risky and costly
revascularization operations to avoid amputation. The investigators hypothesize that their
inadequate NV can be modulated to restore this capability. By correcting impediments to NV in
an out-patient setting, the investigators expect to facilitate CLI management.
While the following impediments to NV are complex, the solution is not. Arteriogenesis
necessitates endothelial cell activation in small collaterals as blood is offloaded away from
the occluded artery. Shear stress provides this stimulus, but is attenuated caudal to
multi-level arterial occlusive disease. The "arteriogenesis switch" is not turned on.
Furthermore, the lack of nutritive oxygenated blood inflow and the accumulation of toxic
metabolic by-products are adverse to synthetic pathways in the ischemic tissue. Additionally,
protein "distress" signals cannot be effectively disseminated by the ischemic tissue, and the
reparative progenitor cells they are supposed to mobilize cannot effectively home back to the
ischemic tissue to orchestrate NV. The CLI patient is especially disadvantaged by having
diminished function and number of circulating progenitor cells (CPC). Lastly these elderly,
often diabetic, patients are less able to fend off infection.
An FDA approved external programmed pneumatic compression device (PPCD) was used to restore
the shear stress stimulus required for arteriogenesis. It also enhances oxygenated nutritive
arterial inflow, clears waste products of metabolism (increased venous and lymphatic
outflow), and helps distress proteins reach the central circulation and mobilized progenitor
cells to return to the ischemic tissue. We corrected the progenitor cell and immunologic
impairment with granulocyte colony stimulating factor (G-CSF), FDA approved for stem cell
mobilization and immunological boost in the setting of cancer chemotherapy. The preliminary
data show clinical, angiographic, hemodynamic and biochemical evidence for enhanced NV. The
purpose for this study is to enroll 25 patients to reproduce the biochemical data to support
a large scale clinical trial.