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Full-Text Articles in Cell and Developmental Biology

Leukemia Inhibitory Factor (Lif): Murine Preimplantation Embryo Development, Implantation Rates, And Skeletal Development, Michael Hayes Mitchell Jul 1998

Leukemia Inhibitory Factor (Lif): Murine Preimplantation Embryo Development, Implantation Rates, And Skeletal Development, Michael Hayes Mitchell

Theses and Dissertations in Biomedical Sciences

Leukemia inhibitory factor (LIF) is a pleiotropic cytokine which demonstrates perplexing physiological effects. It has been demonstrated that LIF is essential for implantation in mice. Little is known relating to the manner by which LIF effects pre-implantation and post-implantation development. The objectives of this project were to determine the effects LIF on pre-implantation development, to determine the effects that it may have on implantation rates, successful pregnancy rates, and resorption rates, and to determine the effects that LIF has on the skeletal development of mice. For the embryo transfer experiments, embryos were exposed to test compounds in the transfer medium …


Fission Yeast Mitotic Regulator Dsk1 Is An Sr Protein-Specific Kinase, Zhaohua Irene Tang, Mitsuhiro Yanagida, Ren-Jang Lin Mar 1998

Fission Yeast Mitotic Regulator Dsk1 Is An Sr Protein-Specific Kinase, Zhaohua Irene Tang, Mitsuhiro Yanagida, Ren-Jang Lin

WM Keck Science Faculty Papers

Intricate interplay may exist between pre-mRNA splicing and the cell division cycle, and fission yeast Dsk1 appears to play a role in such a connection. Previous genetic analyses have implicated Dsk1 in the regulation of chromosome segregation at the metaphase/anaphase transition. Yet, its protein sequence suggests that Dsk1 may function as a kinase specific for SR proteins, a family of pre-mRNA splicing factors containing arginine-serine repeats. Using an in vitro system with purified components, we showed that Dsk1 phosphorylated human and yeast SR proteins with high specificity. The Dsk1-phosphorylated SF2/ASF protein was recognized strongly by a monoclonal antibody (mAb104) known …


The Role Of Domain I In Laminin Chain Assembly, George D. Kamphaus Jan 1998

The Role Of Domain I In Laminin Chain Assembly, George D. Kamphaus

Theses, Dissertations and Capstones

Laminin, a major component of basement membrane, is a trimeric glycoprotein comprised of three chains - α, β and γ (Burgeson et al., 1994). An order for trimer assembly has been deduced: first, the β and γ chains bind to form a dimer and subsequently α is added to complete the trimer (I. Hunter et al., 1990 & 1992; Utani et al., 1994 & 1995). The C-terminal portions, found within the protein structural domain I of the p and y chains, are implicated in dimer and trimer formation by biochemical studies performed extracellularly (Utani, et al., 1994 & 1995; Nomizu …


Type I Camp-Dependent Protein Kinase Delays Apoptosis In Human Neutrophils At A Site Upstream Of Caspase-3, Lav K. Parvathenani, E. Stephen Buescher, Enrique Chacon-Cruz, Stephen J. Beebe Jan 1998

Type I Camp-Dependent Protein Kinase Delays Apoptosis In Human Neutrophils At A Site Upstream Of Caspase-3, Lav K. Parvathenani, E. Stephen Buescher, Enrique Chacon-Cruz, Stephen J. Beebe

Bioelectrics Publications

Current data suggest that apoptosis controls neutrophil numbers in tissues. We analyzed roles for and the sites of action for the cAMP-dependent protein kinases (cAPKs) in apoptosis induced in human neutrophils by in vitro storage, cycloheximide (CHX) exposure, and anti-Fas exposure. Treatment with 8-chlorophenylthio-cAMP (8-CPT-cAMP) prolonged the time required for 50% of the cells to exhibit apoptotic morphology (t 50) from 16.3 to 41.8 h (in vitro culture), from 2.4 to 7.8 h (CHX), and from 4.8 to 6.5 h (anti-Fas). CHX ± 8-CPT-cAMP did not significantly alter resting intracellular calcium levels and H-89, a selective inhibitor of cAPK, had …