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Zhonghua Xue Ye Xue Za Zhi. 2002 Feb;23(2):73-6.
[Composition analysis of hematopoietic stem/progenitor cells in peripheral blood and bone marrow from patients with paroxysmal nocturnal hemoglobinuria]

[Article in Chinese]

Han B, Wu Y, Zhang Z.

Department of Hematology, Peking Union Medical College, Peking Union Medical College Hospital, CAMS & PUMC, Beijing 100730, China.

OBJECTIVE: To evaluate the composition and proportion of the hematopoietic stem cells in peripheral blood (PB) and bone marrow (BM) in paroxysmal nocturnal hemoglobinuria (PNH) patients. METHODS: The CD(34) and CD(59) expressions in PB and BM samples from 21 PNH patients and 8 normal volunteers were analyzed by flow cytometry, and their total numbers were compared. RESULTS: The number of CD(34)(+) cells in both PB and BM of the patients was significantly lower than that in normal controls (P < 0.001), while there was no significant difference between the remittent patients and normal controls. The CD(34)(+) cells in PB of the patients exhibited predominantly normal CD(59) phenotype, which had no relationship either to the patients' clinical manifestations or to the CD(59) expression status of bone marrow CD(34)(+) cells. CONCLUSION: The hematopoietic stem cells in patients with PNH decreases in number but show mainly normal phenotype in PB.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12015074&dopt=Abstract

Development. 2002 Jun;129(11):2619-28.
The zinc-finger transcription factor Klf4 is required for terminal differentiation of goblet cells in the colon.

Katz JP, Perreault N, Goldstein BG, Lee CS, Labosky PA, Yang VW, Kaestner KH.

Department of Genetics, University of Pennsylvania School of Medicine, 560 Clinical Research Building, 415 Curie Blvd, Philadelphia 19104-6145, USA.

Klf4 (formerly GKLF) is a zinc-finger transcription factor expressed in the epithelia of the skin, lungs, gastrointestinal tract and several other organs. In vitro studies have suggested that Klf4 plays an important role in cell proliferation and/or differentiation. Mice homozygous for a null mutation in Klf4 die within 15 hours of birth and show selective perturbation of late-stage differentiation structures in the epidermis, but the function of Klf4 in the gastrointestinal tract has not been investigated. To address this issue, we have generated Klf4(-/-) mice by homologous recombination in embryonic stem cells. In this study, we provide the first in vivo evidence that Klf4 is a goblet cell-specific differentiation factor in the colon. Klf4(-/-) mice exhibit normal cell proliferation and cell death rates in the colon on postnatal day 1. However, Klf4(-/-) mice demonstrate a 90% decrease in the number of goblet cells in the colon, show abnormal expression of the goblet cell-specific marker Muc2 by in situ hybridization, have abnormal staining of the colonic epithelium with Alcian Blue for acidic mucins, and lack normal goblet cell morphology by ultrastructural analysis. All other epithelial cell types are present in the colon of Klf4(-/-) mice. In summary, Klf4 plays a crucial role in colonic epithelial cell differentiation in vivo.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12015290&dopt=Abstract

Cancer. 2002 Dec 1;95(11):2339-45.
Autologous stem cell transplantation for patients with chronic myeloid leukemia. The Argentine Group of Bone Marrow Transplantation (GATMO) experience.

Koziner B, Dengra C, Lucero G, Klein G, Canepa C, Milovic V, Milone G, Robinson A, Cerutti I, Saporito G, Kusminsky G, Milone J, Bordone J, Lastiri F; Argentine Group of Bone Marrow Transplantation.

Bone Marrow Transplant Unit, Instituto Argentino de Diagnostico y Tratamiento, Buenos Aires, Argentina. bkozineetizen.com.ar

BACKGROUND: The objective of this analysis was to evaluate the role of autologous stem cell transplantation (ASCT) in prolonging disease free survival (DFS) and overall survival (OS) in patients with chronic myeloid leukemia (CML) who received autografts of Philadelphia chromosome (Ph) positive or Ph negative cell harvests. METHODS: Over a 4-year period (1994-1999), 53 patients who underwent ASCT for CML were reported to the Argentine Group of Bone Marrow Transplantation (GATMO) Registry. RESULTS: Ph negative cell products were harvested in only 18 patients (34%). Comparison of disease status at the time of autograft, duration of neutropenia, thrombocytopenia, days of antibiotics, and transfusional requirements of red blood cells and platelets did not reveal statistical significant differences between the Ph positive group and the Ph negative group. Only days of hospitalization were increased significantly in patients who received Ph positive autografts. Although DFS at 36 months was significantly longer after infusion of Ph negative cell products (54% vs. 14%; P <or= 0.005), OS differences between the Ph negative group and the Ph positive group (68% vs. 53%; P <or= 0.134) were not significant. CONCLUSIONS: ASCT with Ph negative cell harvests after myeloablative chemotherapy resulted in prolonged periods of hematologic and cytogenetic remission or stable disease after cytogenetic/molecular recurrence in some patients with CML. A superior DFS was observed without any benefit observed for OS. 2002 American Cancer Society.DOI 10.1002/cncr.10931

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12436440&dopt=Abstract

Development. 2002 Jun;129(11):2649-61.
Directed differentiation of pluripotent cells to neural lineages: homogeneous formation and differentiation of a neurectoderm population.

Rathjen J, Haines BP, Hudson KM, Nesci A, Dunn S, Rathjen PD.

Department of Molecular Biosciences, The University of Adelaide, South Australia 5005, Australia.

During embryogenesis the central and peripheral nervous systems arise from a neural precursor population, neurectoderm, formed during gastrulation. We demonstrate the differentiation of mouse embryonic stem cells to neurectoderm in culture, in a manner which recapitulates embryogenesis, with the sequential and homogeneous formation of primitive ectoderm, neural plate and neural tube. Formation of neurectoderm occurs in the absence of extraembryonic endoderm or mesoderm and results in a stratified epithelium of cells with morphology, gene expression and differentiation potential consistent with positionally unspecified neural tube. Differentiation of this population to homogeneous populations of neural crest or glia was also achieved. Neurectoderm formation in culture allows elucidation of signals involved in neural specification and generation of implantable cell populations for therapeutic use.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12015293&dopt=Abstract

Development. 2002 Jun;129(11):2733-47.
Transcription factor AP-2gamma is essential in the extra-embryonic lineages for early postimplantation development.

Auman HJ, Nottoli T, Lakiza O, Winger Q, Donaldson S, Williams T.

Department of Molecular, Cellular and Developmental Biology, Yale University, 266 Whitney Avenue, New Haven, CT 06511, USA.

The members of the AP-2 family of transcription factors play important roles during mammalian development and morphogenesis. AP-2gamma (Tcfap2c - Mouse Genome Informatics) is a retinoic acid-responsive gene implicated in placental development and the progression of human breast cancer. We show that AP-2gamma is present in all cells of preimplantation embryos and becomes restricted to the extra-embryonic lineages at the time of implantation. To study further the biological function of AP-2gamma, we have generated Tcfap2c-deficient mice by gene disruption. The majority of Tcfap2c(-/-) mice failed to survive beyond 8.5 days post coitum (d.p.c.). At 7.5 d.p.c., Tcfap2c(-/-) mutants were typically arrested or retarded in their embryonic development in comparison to controls. Morphological and molecular analyses of mutants revealed that gastrulation could be initiated and that anterior-posterior patterning of the epiblast remained intact. However, the Tcfap2c mutants failed to establish a normal maternal-embryonic interface, and the extra-embryonic tissues were malformed. Moreover, the trophoblast-specific expression of eomesodermin and Cdx2, two genes implicated in FGF-responsive trophoblast stem cell maintenance, was significantly reduced. Chimera studies demonstrated that AP-2gamma plays no major autonomous role in the development of the embryo proper. By contrast, the presence of AP-2gamma in the extra-embryonic membranes is required for normal development of this compartment and also for survival of the mouse embryo.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12015300&dopt=Abstract

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