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Pathogen research abs 1 || Pathogen research abs 2 || Pathogen research abs 3 || Pathogen research abs 4 || Pathogen research abs 5 || Hormone and endocrine research abs 1 || Hormone and endocrine research abs 2 || Hormone and endocrine research abs 3 || Hormone and endocrine research abs 4 || Hormone and endocrine research abs 5 || Follicle and follicular cells research abs 1 || Interferon research abs 1 || Hemoglobin research abs || Stem cell research abs

Blood. 2000 Nov 1;96(9):3126-32.
UTY gene codes for an HLA-B60-restricted human male-specific minor histocompatibility antigen involved in stem cell graft rejection: characterization of the critical polymorphic amino acid residues for T-cell recognition.

Vogt MH, Goulmy E, Kloosterboer FM, Blokland E, de Paus RA, Willemze R, Falkenburg JH.

Departments of Hematology and Immunohematology and Bloodbank, Leiden University Medical Center, Leiden, The Netherlands. m.h.j.vogumc.nl

Rejection of a graft after human leukocyte antigen (HLA)-identical stem cell transplantation (SCT) can be caused by recipient's immunocompetent T lymphocytes recognizing minor histocompatibility antigens on donor stem cells. During rejection of a male stem cell graft by a female recipient, 2 male (H-Y)-specific cytotoxic T lymphocyte (CTL) clones were isolated from peripheral blood. One CTL clone recognized an HLA-A2-restricted H-Y antigen, encoded by the SMCY gene. Another CTL clone recognized an HLA-B60-restricted H-Y antigen. In this study UTY was identified as the gene coding for the HLA-B60-restricted H-Y antigen. The UTY-derived H-Y antigen was characterized as a 10-amino acid residue peptide, RESEEESVSL. Although the epitope differed by 3 amino acids from its X-homologue, UTX, only 2 polymorphisms were essential for recognition by the CTL clone HLA-B60 HY. These results illustrate that CTLs against several H-Y antigens derived from different proteins can contribute simultaneously to graft rejection after HLA-identical, sex-mismatched SCT. Moreover, RESEEESVSL-specific T cells could be isolated from a female HLA-B60+ patient with myelodysplastic syndrome who has been treated with multiple blood transfusions, but not from control healthy HLA-B60+ female donors. This may indicate that RESEEESVSL-reactive T cells are more common in sensitized patients.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11049993&dopt=Abstract

Blood. 2000 Nov 1;96(9):3195-9.
Efficacy of STI571, an abl tyrosine kinase inhibitor, in conjunction with other antileukemic agents against bcr-abl-positive cells.

Thiesing JT, Ohno-Jones S, Kolibaba KS, Druker BJ.

Division of Hematology and Medical Oncology, Oregon Health Sciences University, Portland, OR 97201, USA.

Chronic myelogenous leukemia (CML), a malignancy of a hematopoietic stem cell, is caused by the Bcr-Abl tyrosine kinase. STI571(formerly CGP 57148B), an Abl tyrosine kinase inhibitor, has specific in vitro antileukemic activity against Bcr-Abl-positive cells and is currently in Phase II clinical trials. As it is likely that resistance to a single agent would be observed, combinations of STI571 with other antileukemic agents have been evaluated for activity against Bcr-Abl-positive cell lines and in colony-forming assays in vitro. The specific antileukemic agents tested included several agents currently used for the treatment of CML: interferon-alpha (IFN), hydroxyurea (HU), daunorubicin (DNR), and cytosine arabinoside (Ara-C). In proliferation assays that use Bcr-Abl-expressing cells lines, the combination of STI571 with IFN, DNR, and Ara-C showed additive or synergistic effects, whereas the combination of STI571 and HU demonstrated antagonistic effects. However, in colony-forming assays that use CML patient samples, all combinations showed increased antiproliferative effects as compared with STI571 alone. These data indicate that combinations of STI571 with IFN, DNR, or Ara-C may be more useful than STI571 alone in the treatment of CML and suggest consideration of clinical trials of these combinations.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11050003&dopt=Abstract

Blood. 2000 Nov 1;96(9):3215-23.
Identification and characterization of CKLiK, a novel granulocyte Ca(++)/calmodulin-dependent kinase.

Verploegen S, Lammers JW, Koenderman L, Coffer PJ.

Department of Pulmonary Diseases, University Medical Centre Utrecht, 3584 CX Utrecht, The Netherlands.

Human granulocytes are characterized by a variety of specific effector functions involved in host defense. Several widely expressed protein kinases have been implicated in the regulation of these effector functions. A polymerase chain reaction-based strategy was used to identify novel granulocyte-specific kinases. A novel protein kinase complementary DNA with an open reading frame of 357 amino acids was identified with homology to calcium-calmodulin-dependent kinase I (CaMKI). This has been termed CaMKI-like kinase (CKLiK). Analysis of CKLiK messenger RNA (mRNA) expression in hematopoietic cells demonstrated an almost exclusive expression in human polymorphonuclear leukocytes (PMN). Up-regulation of CKLiK mRNA occurs during neutrophilic differentiation of CD34(+) stem cells. CKLiK kinase activity was dependent on Ca(++) and calmodulin as analyzed by in vitro phosphorylation of cyclic adenosine monophosphate responsive element modulator (CREM). Furthermore, CKLiK- transfected cells treated with ionomycin demonstrated an induction of CRE- binding protein (CREB) transcriptional activity compared to control cells. Additionally, CaMK-kinasealpha enhanced CKLiK activity. In vivo activation of CKLiK was shown by addition of interleukin (IL)-8 to a myeloid cell line stably expressing CKLiK. Furthermore inducible activation of CKLiK was sufficient to induce extracellular signal-related kinase (ERK) mitogen-activated protein (MAP) kinase activity. These data identify a novel Ca(++)/calmodulin-dependent PMN- specific kinase that may play a role in Ca(++)-mediated regulation of human granulocyte functions.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11050006&dopt=Abstract

Circulation. 2003 Apr 29;107(16):2085-8. Epub 2003 Apr 21.
Different differentiation kinetics of vascular progenitor cells in primate and mouse embryonic stem cells.

Sone M, Itoh H, Yamashita J, Yurugi-Kobayashi T, Suzuki Y, Kondo Y, Nonoguchi A, Sawada N, Yamahara K, Miyashita K, Park K, Shibuya M, Nito S, Nishikawa S, Nakao K.

Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507 Japan.

BACKGROUND: We demonstrated that vascular endothelial growth factor receptor 2 (VEGF-R2)-positive cells derived from mouse embryonic stem (ES) cells can differentiate into both endothelial cells and mural cells to suffice as vascular progenitor cells (VPCs). Here we examined whether VPCs occur in primate ES cells and investigated the differences in VPC differentiation kinetics between primate and mouse ES cells. METHODS AND RESULTS: In contrast to mouse ES cells, undifferentiated monkey ES cells expressed VEGF-R2. By culturing these undifferentiated ES cells for 4 days on OP9 feeder layer, VEGF-R2 expression disappeared, and then reappeared after 8 days of differentiation. We then isolated these VEGF-R2-positive and vascular endothelial cadherin (VEcadherin)-negative cells by flow cytometry sorting. Additional 5-day reculture of these VEGF-R2+ VEcadherin- cells on OP9 feeder layer resulted in the appearance of platelet endothelial cell adhesion molecule-1 (PECAM1)-positive, VEcadherin-positive, endothelial nitric oxide synthase (eNOS)-positive endothelial cells. On a collagen IV-coated dish in the presence of serum, these cells differentiated into smooth muscle actin (SMA)-positive and calponin-positive mural cells (pericytes or vascular smooth muscle cells). Addition of 50 ng/mL VEGF to the culture on a collagen IV-coated dish resulted in the appearance of PECAM1+ cells surrounded by SMA+ cells. In addition, these differentiated VEGF-R2+ cells can form tube-like structures in a 3-dimensional culture. CONCLUSIONS: Our findings indicate that differentiation kinetics of VPCs derived from primate and mouse ES cells were different. Differentiated VEGF-R2+ VEcadherin- cells can act as VPCs in primates. To seek the clinical potential of VPCs for vascular regeneration, investigations of primate ES cells are indispensable.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12707232&dopt=Abstract

Blood. 2000 Nov 1;96(9):3272-5.
Assessment of bone marrow stem cell reserve and function and stromal cell function in patients with autoimmune cytopenias.

Papadaki HA, Gibson FM, Rizzo S, Gordon-Smith EC, Marsh JC.

Department of Hematology, St George's Hospital Medical School, London, United Kingdom. epapadaed.uoc.gr

To investigate whether bone marrow (BM) stem cell compartment and/or BM microenvironment are affected by the immune insult in autoimmune cytopenias (AICs), BM stem cell reserve and function and BM stromal function were studied in 15 AIC patients. Stem cells were evaluated by means of flow cytometry, clonogenic progenitor cell assays, long-term BM cultures (LTBMCs), and limiting dilution assay for quantification of long-term-culture initiating cells (LTC-ICs). Stromal cell function was assessed with the use of preformed irradiated LTBMCs from patients and normal controls, recharged with normal CD34(+) cells. AIC patients exhibited a high number of CD34(+), CD34(+)/CD38(+), and CD34(+)/CD38(-) cells; high frequency of granulocyte-macrophage colony forming units in the BM mononuclear cell fraction; high colony recovery in LTBMCs; and normal LTC-IC frequency. Patient BM stromal layers displayed normal hematopoietic-supporting capacity and increased production of granulocyte-colony stimulating factor. Data from this study support the concept that AIC patients with severe, resistant disease might be appropriate candidates for autologous stem cell transplantation.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11050013&dopt=Abstract

Hair loss is a problem in modern soceity. Examining the factors of hair growth may shed light on how hair loss might occur. How long can hair grow before it stops growing eventually if it does? Given that the hair growth rate is quite uniform and constant, somewhere between 0.3-0.5 millimeters per day, it's believed that the length of anagen, the growth phase, differs among individuals, and this is the major determinant to the maximum hair length. For some individuals, anagen may last ten years. Of course the length of the anagen is governed by genes, and the genetic background of the individuals. Non-genetic factors such as nutritional condition, weather, seasonal changes (hair may grow a bit faster during winter), taking medications, health condition may of course influence the rate of hair growth as well as hair loss. The shape of the hair, straight or curly, is dependent on the shape of the follicle. A circular or round hair follicle would generate straight hair, while the follicle with oval or elliptical shapes (in its cross-section) would produce a curly hair.

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