Follitropin Signal Transduction: Alternative Splicing of the FSH Receptor Gene Produces a Dominant Negative Form of Receptor Which Inhibits Hormone Action

1996 ◽  
Vol 226 (3) ◽  
pp. 717-722 ◽  
Author(s):  
M.R. Sairam ◽  
L.G. Jiang ◽  
T.A. Yarney ◽  
H. Khan
Keyword(s):  
Signal Transduction ◽  
Alternative Splicing ◽  
Receptor Gene ◽  
Dominant Negative ◽  
Fsh Receptor ◽  
Hormone Action ◽  
Dominant Negative Form ◽  
Negative Form ◽  
Fsh Receptor Gene

FGF signals are involved in the differentiation of notochord cells and mesenchyme cells of the ascidianHalocynthia roretzi

Development ◽  
2001 ◽  
Vol 128 (14) ◽  
pp. 2711-2721 ◽  
Author(s):  
Yoshie Shimauchi ◽  
Seiko D. Murakami ◽  
Nori Satoh
Keyword(s):  
Receptor Gene ◽  
Epidermal Cells ◽  
Dominant Negative ◽  
Tyrosine Kinase Domain ◽  
Fgf Receptor ◽  
Dominant Negative Form ◽  
Notochord Cells ◽  
Mesenchyme Cells ◽  
Endodermal Cells ◽  
Negative Form

Differentiation of notochord cells and mesenchyme cells of the ascidian Halocynthia roretzi requires interactions with neighboring endodermal cells and previous experiments suggest that these interactions require fibroblast growth factor (FGF). In the present study, we examined the role of FGF in these interactions by disrupting signaling using the dominant negative form of the FGF receptor. An FGF receptor gene of H. roretzi (HrFGFR) is expressed both maternally and zygotically. The maternally expressed transcript was ubiquitously distributed in fertilized eggs and in early embryos. Zygotic expression became evident by the neurula stage and transcripts were detected in epidermal cells of the posterior half of embryos. Synthetic mRNA for the dominant negative form of FGFR, in which the intracellular tyrosine kinase domain was deleted, was injected into fertilized eggs to interfere with the possible function of HrFGFR. Injected eggs cleaved and gastrulated the same as the control embryos. Analyses of the expression of differentiation markers in the experimental embryos indicated that the differentiation of epidermal cells, muscle cells and endodermal cells was not affected significantly. However, manipulated embryos showed downregulation of notochord-specific Brachyury expression and failure of notochord cell differentiation, resulting in the development of tailbud embryos with shorted tails. The expression of an actin gene that is normally expressed in mesenchyme cells was also suppressed. These results suggest that FGF signals are involved in differentiation of notochord cells and mesenchyme cells in Halocynthia embryos. Furthermore, the patterning of a neuron-specific tubulin gene expression was disturbed, suggesting that the formation of the nervous system was directly affected by disrupting FGF signals or indirectly affected due to the disruption of normal notochord formation.

Alternative Splicing Variants of the FSH receptor gene in the testis of infertile men

2000 ◽  
Vol 74 (3) ◽  
pp. S28-S29
Author(s):  
G.J Song ◽  
Y.S Park ◽  
H.S Lee ◽  
J.W Kim ◽  
J.T Seo ◽  
...  
Keyword(s):  
Alternative Splicing ◽  
Receptor Gene ◽  
Fsh Receptor ◽  
Infertile Men ◽  
Splicing Variants ◽  
Fsh Receptor Gene

scholarly journals Erk5 Participates in Neuregulin Signal Transduction and Is Constitutively Active in Breast Cancer Cells Overexpressing ErbB2

2002 ◽  
Vol 22 (1) ◽  
pp. 270-285 ◽  
Author(s):  
Azucena Esparís-Ogando ◽  
Elena Díaz-Rodríguez ◽  
Juan Carlos Montero ◽  
Laura Yuste ◽  
Piero Crespo ◽  
...  
Keyword(s):  
Signal Transduction ◽  
Cancer Cells ◽  
Mapk Pathway ◽  
Active Form ◽  
Dominant Negative ◽  
Erbb Receptors ◽  
Mcf7 Cells ◽  
Dominant Negative Form ◽  
Negative Form ◽  
Constitutively Active

ABSTRACT The four receptor tyrosine kinases of the ErbB family play essential roles in several physiological processes and have also been implicated in tumor generation and/or progression. Activation of ErbB1/EGFR is mainly triggered by epidermal growth factor (EGF) and other related ligands, while activation of ErbB2, ErbB3, and ErbB4 receptors occurs by binding to another set of EGF-like ligands termed neuregulins (NRGs). Here we show that the Erk5 mitogen-activated protein kinase (MAPK) pathway participates in NRG signal transduction. In MCF7 cells, NRG activated Erk5 in a time- and dose-dependent fashion. The action of NRG on Erk5 was dependent on the kinase activity of ErbB receptors but was independent of Ras. Expression in MCF7 cells of a dominant negative form of Erk5 resulted in a significant decrease in NRG-induced proliferation of MCF7 cells. Analysis of Erk5 in several human tumor cell lines indicated that a constitutively active form of this kinase was present in the BT474 and SKBR3 cell lines, which also expressed activated forms of ErbB2, ErbB3, and ErbB4. Treatments aimed at decreasing the activity of these receptors caused Erk5 inactivation, indicating that the active form of Erk5 present in BT474 and SKBR3 cells was due to a persistent positive stimulus originating at the ErbB receptors. In BT474 cells expression of the dominant negative form of Erk5 resulted in reduced proliferation, indicating that in these cells Erk5 was also involved in the control of proliferation. Taken together, these results suggest that Erk5 may play a role in the regulation of cell proliferation by NRG receptors and indicate that constitutively active NRG receptors may induce proliferative responses in cancer cells through this MAPK pathway.

SCREENING OF FSH RECEPTOR GENE MUTATION (C566T) IN AZOOSPERMIC MEN IN JAPAN

2006 ◽  
Vol 52 (1) ◽  
pp. 15-19 ◽  
Author(s):  
T. Ishikawa ◽  
M. Fujisawa ◽  
J. Tapanainen
Keyword(s):  
Gene Mutation ◽  
Receptor Gene ◽  
Fsh Receptor ◽  
Fsh Receptor Gene

scholarly journals Modulation of flight and feeding behaviours requires presynaptic IP3Rs in dopaminergic neurons

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Anamika Sharma ◽  
Gaiti Hasan
Keyword(s):  
Dopaminergic Neurons ◽  
Calcium Release ◽  
Neural Circuit ◽  
Dominant Negative ◽  
Neuronal Function ◽  
Axonal Projections ◽  
Dominant Negative Form ◽  
Internal States ◽  
Innate Behaviour ◽  
Negative Form

Innate behaviours, although robust and hard wired, rely on modulation of neuronal circuits, for eliciting an appropriate response according to internal states and external cues. Drosophila flight is one such innate behaviour that is modulated by intracellular calcium release through inositol 1,4,5-trisphosphate receptors (IP3Rs). Cellular mechanism(s) by which IP3Rs modulate neuronal function for specific behaviours remain speculative, in vertebrates and invertebrates. To address this, we generated an inducible dominant negative form of the IP3R (IP3RDN). Flies with neuronal expression of IP3RDN exhibit flight deficits. Expression of IP3RDN helped identify key flight-modulating dopaminergic neurons with axonal projections in the mushroom body. Flies with attenuated IP3Rs in these presynaptic dopaminergic neurons exhibit shortened flight bouts and a disinterest in seeking food, accompanied by reduced excitability and dopamine release upon cholinergic stimulation. Our findings suggest that the same neural circuit modulates the drive for food search and for undertaking longer flight bouts.

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