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Full-Text Articles in Medicine and Health Sciences
Platelet A-Granule Fibrinogen, Albumin, And Immunoglobulin G Are Not Synthesized By Rat And Mouse Megakaryocytes, Prem Handagama, Daniel A. Rappolee, Zena Werb, Jack Levin, Dorothy F. Bainton
Platelet A-Granule Fibrinogen, Albumin, And Immunoglobulin G Are Not Synthesized By Rat And Mouse Megakaryocytes, Prem Handagama, Daniel A. Rappolee, Zena Werb, Jack Levin, Dorothy F. Bainton
Department of Obstetrics and Gynecology Research Publications
It has been assumed that endogenous synthesis by the platelet precursor cell, the bone marrow megakaryocyte, is the major source of platelet a-granule protein. To test this hypothesis, we used mRNA phenotyping to detect in megakaryocytes the presence of mRNA transcripts specific for various proteins. Our results indicate that megakaryocytes synthesize platelet factor 4, a protein relatively specific for platelets, but do not express mRNA transcripts for the fibrinogen, albumin, or IgG found in a-granules. We have previously shown that mega- karyocytes endocytose circulating proteins, including fibrino- gen, albumin, and IgG, and incorporate them into a-granules. Thus, platelets appear to …
Two Alkaline Phosphatase Genes Are Expressed During Early Development In The Mouse Embryo, Ann C. Hahnel, Daniel A. Rappolee, Jose Luis Millan, Thomas Manes, Carol A. Ziomek, Nicoleta G. Theodosiou, Zena Werb, Roger A. Pedersen, Gilbert A. Schultz
Two Alkaline Phosphatase Genes Are Expressed During Early Development In The Mouse Embryo, Ann C. Hahnel, Daniel A. Rappolee, Jose Luis Millan, Thomas Manes, Carol A. Ziomek, Nicoleta G. Theodosiou, Zena Werb, Roger A. Pedersen, Gilbert A. Schultz
Department of Obstetrics and Gynecology Research Publications
Alkaline phosphatase (AP) activity is stage specific in mouse embryos and may be associated with compaction and separation of trophectoderm from inner cell mass in preimplantation development. We previously sequenced a cDNA and two mouse AP genes that could contribute to the AP activity in embryos. Oligonucleotide primers were constructed from the three sequences and used in the reverse transcription-polymerase chain reaction technique to establish that two of the three AP isozymes are transcribed during preimplantation development. The predominant transcript (E-AP) is from a gene highly homologous to the human tissue-specific APs, but different from the mouse intestinal AP. Tissue …