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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. 2001 Feb 15;97(4):901-10.
mDYRK3 kinase is expressed selectively in late erythroid progenitor cells and attenuates colony-forming unit-erythroid development.

Geiger JN, Knudsen GT, Panek L, Pandit AK, Yoder MD, Lord KA, Creasy CL, Burns BM, Gaines P, Dillon SB, Wojchowski DM.

Department of Biochemistry & Molecular Biology and Veterinary Science, The Pennsylvania State University, University Park, PA, USA.

DYRKs are a new subfamily of dual-specificity kinases that was originally discovered on the basis of homology to Yak1, an inhibitor of cell cycle progression in yeast. At present, mDYRK-3 and mDYRK-2 have been cloned, and mDYRK-3 has been characterized with respect to kinase activity, expression among tissues and hematopoietic cells, and possible function during erythropoiesis. In sequence, mDYRK-3 diverges markedly in noncatalytic domains from mDYRK-2 and mDYRK-1a, but is 91.3% identical overall to hDYRK-3. Catalytically, mDYRK-3 readily phosphorylated myelin basic protein (but not histone 2B) and also appeared to autophosphorylate in vitro. Expression of mDYRK-1a, mDYRK-2, and mDYRK-3 was high in testes, but unlike mDYRK1a and mDYRK 2, mDYRK-3 was not expressed at appreciable levels in other tissues examined. Among hematopoietic cells, however, mDYRK-3 expression was selectively elevated in erythroid cell lines and primary pro-erythroid cells. In developmentally synchronized erythroid progenitor cells, expression peaked sharply following exposure to erythropoietin plus stem cell factor (SCF) (but not SCF alone), and in situ hybridizations of sectioned embryos revealed selective expression of mDYRK-3 in fetal liver. Interestingly, antisense oligonucleotides to mDYRK-3 were shown to significantly and specifically enhance colony-forming unit-erythroid colony formation. Thus, it is proposed that mDYRK-3 kinase functions as a lineage-restricted, stage-specific suppressor of red cell development. (Blood. 2001;97:901-910)

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11159515&dopt=Abstract

Blood. 2001 Feb 15;97(4):911-4.
Requirement of Shp-2 tyrosine phosphatase in lymphoid and hematopoietic cell development.

Qu CK, Nguyen S, Chen J, Feng GS.

Burnham Institute, La Jolla, CA, USA.

Shp-1 and Shp-2 are cytoplasmic phosphotyrosine phosphatases with similar structures. Mice deficient in Shp-2 die at midgestation with defects in mesodermal patterning, and a hypomorphic mutation at the Shp-1 locus results in the moth-eaten viable (me(v)) phenotype. Previously, a critical role of Shp-2 in mediating erythroid/myeloid cell development was demonstrated. By using the RAG-2-deficient blastocyst complementation, the role of Shp-2 in lymphopoiesis has been determined. Chimeric mice generated by injecting Shp-2(-/-) embryonic stem cells into Rag-2-deficient blastocysts had no detectable mature T and B cells, serum immunoglobulin M, or even Thy-1(+) and B220(+) precursor lymphocytes. Collectively, these results suggest a positive role of Shp-2 in the development of all blood cell lineages, in contrast to the negative effect of Shp-1 in this process. To determine whether Shp-1 and Shp-2 interact in hematopoiesis, Shp-2(-/-):me(v)/me(v) double-mutant embryos were generated and the hematopoietic cell development in the yolk sacs was examined. More hematopoietic stem/progenitor cells were detected in Shp-2(-/-):me(v)/me(v) embryos than in Shp-2(-/-) littermates. The partial rescue by Shp-1 deficiency of the defective hematopoiesis caused by the Shp-2 mutation suggests that Shp-1 and Shp-2 have antagonistic effects in hematopoiesis, possibly through a bidirectional modulation of the same signaling pathway(s).

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11159516&dopt=Abstract

Blood. 2001 Feb 15;97(4):1027-34.
Cell-surface trafficking and release of flt3 ligand from T lymphocytes is induced by common cytokine receptor gamma-chain signaling and inhibited by cyclosporin A.

Chklovskaia E, Nissen C, Landmann L, Rahner C, Pfister O, Wodnar-Filipowicz A.

Department of Research, University Hospital Basel, and Institute of Anatomy, University of Basel, Basel, Switzerland.

The flt3 ligand (FL) is a growth and differentiation factor for primitive hematopoietic precursors, dendritic cells, and natural killer cells. Human T lymphocytes express FL constitutively, but the cytokine is retained intracellularly within the Golgi complex. FL is mobilized from the cytoplasmic stores and its serum levels are massively increased during the period of bone marrow aplasia after stem cell transplantation (SCT). Signals that trigger the release of FL by T cells remain unknown. This study shows that interleukin (IL)-2, IL-4, IL-7, and IL-15, acting through a common receptor gamma chain (gammac), but not cytokines interacting with other receptor families, are efficient inducers of cell surface expression of membrane-bound FL (mFL) and secretion of soluble FL (sFL) by human peripheral blood T lymphocytes. The gammac-mediated signaling up-regulated FL in a T-cell receptor-independent manner. IL-2 and IL-7 stimulated both FL messenger RNA (mRNA) expression and translocation of FL protein to the cell surface. Cyclosporin A (CsA) inhibited gammac-mediated trafficking of FL at the level of transition from the Golgi to the trans-Golgi network. Accordingly, serum levels of sFL and expression of mFL by T cells of CsA-treated recipients of stem cell allografts were reduced approximately 2-fold (P <.01) compared to patients receiving autologous grafts. The conclusion is that FL expression is controlled by gammac receptor signaling and that CsA interferes with FL release by T cells. The link between gammac-dependent T-cell activation and FL expression might be important for T-cell effector functions in graft acceptance and antitumor immunity after SCT.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11159533&dopt=Abstract

Blood. 2001 Feb 15;97(4):1086-91.
Human peripheral blood eosinophils express stem cell factor.

Hartman M, Piliponsky AM, Temkin V, Levi-Schaffer F.

Department of Pharmacology, School of Pharmacy, The Hebrew University-Hadassah Medical School, Jerusalem, Israel.

Stem cell factor (SCF) or c-Kit ligand is a cytokine associated with the differentiation, survival, and activation of mast cells. Eosinophils have pleiotropic functions in several diseases and, together with mast cells, are key cells in allergy. Mast cell-eosinophil interactions can take place during the late and chronic phases of allergy. It was, therefore, investigated whether eosinophils can produce SCF and consequently influence mast cells. Human peripheral blood eosinophils variably expressed mRNA for the soluble and uncleaved forms of SCF (reverse transcription-polymerase chain reaction) and produced the 18.5-kd protein backbone of SCF (Western blot analysis). After overnight incubation in medium, eosinophils also produced SCF of higher molecular weight (42-45 kd) that might represent its glycosylated forms. Eosinophils expressed cytoplasmic SCF that colocalized with major basic protein (confocal laser microscopy). Freshly isolated eosinophils contained 8.9 +/- 1.7 pg SCF/10(6) (mean +/- SEM; enzyme-linked immunosorbent assay). Although overnight incubation of the eosinophils in either culture medium or in phorbol 12-myristate 13-acetate-calcium ionophore did not cause the secretion of SCF, the addition of chymase induced SCF release. In summary, it was demonstrated that human peripheral blood eosinophils are a source of SCF. These results may contribute to a better understanding of the interactions between eosinophils and mast cells in allergic inflammation.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11159541&dopt=Abstract

Gastroenterology. 2001 Feb;120(2):534-44.
Human hepatic stem-like cells isolated using c-kit or CD34 can differentiate into biliary epithelium.

Crosby HA, Kelly DA, Strain AJ.

School of Biosciences, University of Birmingham, England. H.A.CROSBY.BCham.ac.uk

BACKGROUND & AIMS: Recent reports suggest that after bone marrow transplantation into rodents and humans, hematopoietic stem cells migrate into the liver and give rise to oval cells, hepatocytes, and biliary epithelial cells. We investigated this hypothesis further in the human liver using the hematopoietic markers c-kit and CD34. METHODS: Immunofluorescence confocal microscopy was performed using cytokeratin 19 (CK-19; biliary cell marker) with either c-kit or CD34. Immunomagnetic separation was then used to select c-kit- or CD34-positive cells. After attachment, cells were cultured for up to 7 days, and their growth and phenotypic characteristics were examined. RESULTS: In cirrhotic tissue, c-kit- or CD34-positive cells were located in the portal tracts surrounding bile ducts. Occasionally c-kit- (but not CD34-) positive cells that coexpressed CK-19 were observed integrated into bile ducts. In vitro, immunoisolated c-kit or CD34 cells gave rise to colonies of at least 2 morphologies expressing CK-19 or CD31 (endothelial cell marker). CD34- or c-kit-positive cells with similar properties were also isolated from normal liver. CONCLUSIONS: These findings indicate that cells present in human liver that express the markers c-kit or CD34 have the capacity to differentiate into biliary epithelial cell lineage and may therefore represent human biliary epithelial progenitor cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11159894&dopt=Abstract

Natural Herbal Supplement: Hair Million

Hair Loss, or alopecia is a concern for increasing number of folks in aging society. Loss of hair is a visible problem, and affects the appearance and changes identity of a person.
The phenomenon of hair thinning and hair loss is most commonly associated with natural aging, although there are many other causes of hair loss, which include inherited or genetic conditions, illnesses, malnutrition, stress, hormonal problems, chemotherapy, and use of some drugs.
Hair growth is a sophisticated biological process, which has not yet been completely understood. A multitude of therapeutic measures, including drugs, surgery, and suppelements have been made available, and used. However, due to the heterogeneity in the underlying cause, there is no perfect cure for all hair loss cases. Most of chemical drugs and hair transplantation surgeries are not free from varying degrees of undesirable side effects on health.

Hair Million is an alternative solution to hair loss problems. Anecdotally, it shows prositive results and improvement for age-related hair thinning and hair loss for a fraction of people who take it. We do not know the mechanisms of action as to how Hair Million works to help stop hair loss, and promote hair growth. We only know by anecdotal observations. There has been no clinical trials nor placebo controlled statistical analysis on the efficacy of Hair Million on hair loss and hair growth. However, there are two merits in this hair restoration herbal formula:
Firstly, Hair Million is rather inexpensive, and secondly, it is made of well known herbs that are safe when consumed in regular quantities.

DHEA is a natural hormone, and it is produced in our body by the adrenal glands. DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones) or estrogens (female hormones) in the cells.

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