Amer Mahmood

Learn More
The derivation of osteogenic cells from human embryonic stem cells (hESC) has been hampered by the absence of easy and reproducible protocols. hESC grown in feeder-free conditions, often show a sub population of fibroblast-like, stromal cells growing between the colonies. Thus, we examined the possibility that these cells represent a population of stromal(More)
Cortisone, thyroxine, epidermal growth factor, or insulin were administered to 8-day-old rats for 4 days. In comparison to saline-injected controls, cortisone treatment: 1) lowered the sialic acid and raised the fucose content of the intestinal microvillus membranes, 2) increased [3H]fucose incorporation into these membranes, and 3) decreased the membrane(More)
Directing differentiation of human embryonic stem cells (hESCs) into specific cell types using an easy and reproducible protocol is a prerequisite for the clinical use of hESCs in regenerative-medicine procedures. Here, we report a protocol for directing the differentiation of hESCs into mesenchymal progenitor cells. We demonstrate that inhibition of(More)
Tumor necrosis factor (TNF-alpha) in conjunction with interferon-gamma (IFN-gamma) plays an important role in lymphocyte recruitment and granuloma formation in mycobacterial diseases. Lepromatous leprosy infections are typically associated with low to absent T cell responses and the absence of INF-gamma secretion. Chemokines such as IL-8, MCP-1, and(More)
BACKGROUND AND OBJECTIVES Acute lymphoblastic leukemia (ALL) is a complex genetic disease involving many fusion oncogenes (FO) having prognostic significance. The frequency of various FO can vary in different ethnic groups, with important implications for prognosis, drug selection and treatment outcome. METHOD We studied fusion oncogenes in 101 pediatric(More)
SETTING The success of Mycobacterium tuberculosis as a human pathogen depends on its ability to tolerate and perhaps manipulate host defense mechanisms. OBJECTIVE To determine the induction of tumour necrosis factor-alpha (TNF alpha), a central mediator of immunity, by human monocytes infected with virulent M. tuberculosis, M. leprae and attenuated M.(More)
BACKGROUND BCR-ABL kinase domain mutations are infrequently detected in newly diagnosed chronic-phase chronic myeloid leukemia (CML) patients. Recent studies indicate the presence of pre-existing BCR-ABL mutations in a higher percentage of CML patients when CD34+ stem/progenitor cells are investigated using sensitive techniques, and these mutations are(More)
We present evidence of a change from sialylation to fucosylation of intestinal microvillus membrane oligosaccharides during postnatal development in the rat. The initial high sialic acid to fucose molar ratio in native and delipidated membranes was completely reversed after weaning. The specific binding of 125I-labeled wheat germ agglutinin to(More)
The intestinal microvillus membrane of suckling rats has a large number of unsubstituted and sialyl-substituted sites for 125I-labeled peanut agglutinin in glycopeptides, indicating that the membrane surface is rich in beta, D-Gal(1 leads to 3)D-GalNAc residues. The membrane loses all the unsubstituted and about half of the sialyl-substituted PNA-reactive(More)
The recent establishment of in vitro cultures of human embryonic stem cells (hESC) from preimplantation embryos has provided a biologically relevant in vitro model for studying early human embryonic development and the signals involved in early stages of cellular commitment to different lineages. In addition, hESC represent a good source of an unlimited(More)