Agent capable of up regulating the expression of the catecholamine receptor in stem cells or progenitors can be carried out in vivo. This procedure is known as mobilization of hematopoietic cells to the blood and is typically carried out by 5 consecutive injections of g-csf (petit et al. viagra 20mg cheap , 2002). viagra online mexico Alternatively as we show in the examples below, stem cells can be stimulated ex-vivo with the agent such as a myeloid cytokine like gm-csf or g-csf. cheap viagra online Before stimulation, stem cells/progenitors can be maintained in medium supplemented with heat inactivated fcs and with one or more cytokines such as epo, scf, il-3 and tpo. [0171]examples of disease disorder or conditions that may be treated by stem cell therapy are described in disease. order viagra online Html and include, but are not limited to, cancers such as acute lymphocytic leukemia (all), acute myelogenous leukemia (aml), chronic myelocytic leukemia (cml), myelodysplastic syndrome (mds), liposarcoma, neuroblastoma, non-hodgkin's lymphoma, yolk sac sarcoma; blood disorders such as amegakaryocytic thrombocytopenia (amt), aplastic anemia, diamond-blackfan anemia, congenital cytopenia, evan's syndrome, fanconi's anemia, kostmann's syndrome, sickle cell anemia, thalassemia; inherited metabolic disorders such as adrenoleukodystrophy, bare-lymphocyte syndrome, dyskeratosis congenital, familial erythrophagocytic lymphohistiocytosis, gaucher disease, gunter disease, hunter syndrome, hurler syndrome, inherited neuronal ceroid lipofuscinosis, krabbe disease, lanegerhans'-cell histiocytosis, lesch-nyhan disease, leukocyte adhesion deficiency, osteopetrosis; and immunodeficiencies such as adenosine deaminase deficiency (ada or scid-ada), severe combined immunodeficiency (scid), wiskott-aldrich syndrome, x-linked lymphoproliferative disease (xlp), hyper-igm immunodeficiency (him), neurological diseases such as alzheimer's, parkinson's disease, als, (also commonly known as lou gehrig's disease); muscular dystrophy; multiple sclerosis; arthritis; spinal cord injuries; brain injury; stroke; heart disease; liver and retinal disease; diabetes; and to alleviate the side effects of chemotherapy or radiation therapy such as myelosupression and peripheral blood cytopenia. viagra cost [0172]the present invention provides populations of cells comprising improved or superior stem cells or progenitors suitable for use in transplantation, tissue replacement, tissue engraftment, tissue regeneration, tissue repopulation and/or cell therapy, and methods for preparing these population of cells. viagra without prescription The invention describes improved populations comprising stem cells and/or progenitors stimulated ex-vivo with a catecholamine receptor agonist, and optionally with an agent capable of inducing up-regulation of the catecholamine receptor expression in stem cells or progenitors. buy generic viagra south africa [0173]one method for preparing an improved stem cell/progenit. viagra online without prescription