scholarly journals Dmrt5 Controls Corticotrope and Gonadotrope Differentiation in the Zebrafish Pituitary

2015 ◽  
Vol 29 (2) ◽  
pp. 187-199 ◽  
Author(s):  
Martin Graf ◽  
Elizabeth-Raye Teo Qi-Wen ◽  
Menachem Viktor Sarusie ◽  
Flora Rajaei ◽  
Christoph Winkler
Keyword(s):  
Transcription Factors ◽  
Cell Differentiation ◽  
Reproductive System ◽  
Anterior Pituitary ◽  
Endocrine Cells ◽  
Terminal Differentiation ◽  
Pars Distalis ◽  
Vertebrate Species ◽  
Lineage Specification ◽  
Mutant Analysis

Abstract Dmrt transcription factors control sex determination or sex-specific differentiation across all invertebrate and vertebrate species, in which they have been studied so far. In addition to important functions in the reproductive system, also nongonadal roles have been assigned to several dmrt family members. One example is dmrt5, which was shown to guide neurogenesis in the forebrain of some vertebrates including fish. Here we show that in zebrafish, dmrt5 is also expressed adjacent to the pituitary anlage and later in the anterior pars distalis in which it organizes differentiation of endocrine cells. We find that pituitary induction, cell survival, proliferation, and early lineage specification in the pituitary is independent of dmrt5. Instead, dmrt5 is required for terminal differentiation of corticotropes and gonadotropes. Gene knockdown and mutant analysis revealed that dmrt5 promotes corticotrope differentiation via tbx19 expression, whereas it prevents gonadotrope differentiation in the anterior pars distalis. In dmrt5 morphants and mutants, reduced corticotrope numbers may result in irregular positioning and reduced maintenance of lactotropes. In conclusion, our study establishes a novel function for dmrt5 for cell differentiation in the anterior pituitary. Intriguingly, its effect on gonadotrope numbers defines a first nongonadal role for a dmrt family member that appears crucial for the activity of the reproductive system.

scholarly journals The transcription factors IRF8 and PU.1 negatively regulate plasma cell differentiation

2014 ◽  
Vol 211 (11) ◽  
pp. 2169-2181 ◽  
Author(s):  
Sebastian Carotta ◽  
Simon N. Willis ◽  
Jhagvaral Hasbold ◽  
Michael Inouye ◽  
Swee Heng Milon Pang ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Cell Differentiation ◽  
B Cells ◽  
B Cell ◽  
Plasma Cell ◽  
Plasma Cells ◽  
Terminal Differentiation ◽  
Plasma Cell Differentiation ◽  
Class Switch ◽  
Complex Functions

Activated B cells undergo immunoglobulin class-switch recombination (CSR) and differentiate into antibody-secreting plasma cells. The distinct transcriptomes of B cells and plasma cells are maintained by the antagonistic influences of two groups of transcription factors: those that maintain the B cell program, including BCL6 and PAX5, and plasma cell–promoting factors, such as IRF4 and BLIMP-1. We show that the complex of IRF8 and PU.1 controls the propensity of B cells to undergo CSR and plasma cell differentiation by concurrently promoting the expression of BCL6 and PAX5 and repressing AID and BLIMP-1. As the PU.1–IRF8 complex functions in a reciprocal manner to IRF4, we propose that concentration-dependent competition between these factors controls B cell terminal differentiation.

scholarly journals Spi-B inhibits human plasma cell differentiation by repressing BLIMP1 and XBP-1 expression

Blood ◽  
2008 ◽  
Vol 112 (5) ◽  
pp. 1804-1812 ◽  
Author(s):  
Heike Schmidlin ◽  
Sean A. Diehl ◽  
Maho Nagasawa ◽  
Ferenc A. Scheeren ◽  
Remko Schotte ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Cell Differentiation ◽  
B Cells ◽  
B Cell ◽  
Plasma Cell ◽  
Target Genes ◽  
Plasma Cells ◽  
Terminal Differentiation ◽  
Transactivation Domain ◽  
Plasma Cell Differentiation

Abstract The terminal differentiation of B cells into antibody-secreting plasma cells is tightly regulated by a complex network of transcription factors. Here we evaluated the role of the Ets factor Spi-B during terminal differentiation of human B cells. All mature tonsil and peripheral blood B-cell subsets expressed Spi-B, with the exception of plasma cells. Overexpression of Spi-B in CD19+ B cells inhibited, similar to the known inhibitor BCL-6, the expression of plasma cell–associated surface markers and transcription factors as well as immunoglobulin production, ie, in vitro plasma cell differentiation. The arrest in B-cell differentiation enforced by Spi-B was independent of the transactivation domain, but dependent on the Ets-domain. By chromatin immunoprecipitation and assays using an inducible Spi-B construct BLIMP1 and XBP-1 were identified as direct target genes of Spi-B mediated repression. We propose a novel role for Spi-B in maintenance of germinal center and memory B cells by direct repression of major plasma cell factors and thereby plasma cell differentiation.

scholarly journals Maternal endotoxin exposure attenuates allergic airway disease in infant rats

2010 ◽  
Vol 298 (5) ◽  
pp. L670-L677 ◽  
Author(s):  
Lei Cao ◽  
Jinxia Wang ◽  
Yingchun Zhu ◽  
Irene Tseu ◽  
Martin Post
Keyword(s):  
Transcription Factors ◽  
Cell Differentiation ◽  
T Cell ◽  
Airway Disease ◽  
Positive Control ◽  
Allergic Airway Disease ◽  
T Helper ◽  
T Helper 1 ◽  
Pregnant Rats ◽  
Neonatal Immune System

Prenatal exposures to immunogenic stimuli, such as bacterial LPS, have shown to influence the neonatal immune system and lung function. However, no detailed analysis of the immunomodulatory effects of LPS on postnatal T helper cell differentiation has been performed. Using a rat model, we investigated the effect of prenatal LPS exposure on postnatal T cell differentiation and experimental allergic airway disease. Pregnant rats were injected with LPS on day 20 and 21 (term = 22 days). Some of the offspring were sensitized and challenged with ovalbumin. Positive control animals were placebo exposed to saline instead of LPS, whereas negative controls were sensitized with saline. Expression of T cell-related transcription factors and cytokines was quantified in the lung, and airway hyperresponsiveness was measured. Prenatal LPS exposure induced a T helper 1 (TH1) immune milieu in the offspring of rats [i.e., increased T-bet and TH1 cytokine expression while expression of TH2-associated transcription factors (GATA3 and STAT6) and cytokines was decreased]. Prenatal LPS exposure did not trigger TH17 cell differentiation in the offspring. Furthermore, prenatal LPS exposure reduced ovalbumin-induced (TH2-mediated) airway inflammation, eosinophilia, and airway responsiveness. Thus, in utero exposure to endotoxin promotes a TH1 immune environment, which suppresses the development of allergic airway disease later in life.

Cardiac Transcription Factors Driven Lineage-Specification of Adult Stem Cells

2009 ◽  
Vol 3 (1) ◽  
pp. 61-65 ◽  
Author(s):  
Ana Armiñán ◽  
Carolina Gandía ◽  
José Manuel García-Verdugo ◽  
Elisa Lledó ◽  
José Luis Mullor ◽  
...  
Keyword(s):  
Stem Cells ◽  
Transcription Factors ◽  
Adult Stem Cells ◽  
Lineage Specification ◽  
Cardiac Transcription Factors

scholarly journals Discrete Roles of STAT4 and STAT6 Transcription Factors in Tuning Epigenetic Modifications and Transcription during T Helper Cell Differentiation

Immunity ◽  
2010 ◽  
Vol 32 (6) ◽  
pp. 840-851 ◽  
Author(s):  
Lai Wei ◽  
Golnaz Vahedi ◽  
Hong-Wei Sun ◽  
Wendy T. Watford ◽  
Hiroaki Takatori ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Cell Differentiation ◽  
Epigenetic Modifications ◽  
T Helper Cell ◽  
Helper Cell ◽  
T Helper

scholarly journals Multiple neural bHLHs ensure the precision of a neuronal specification event in C. elegans

Biology Open ◽  
2021 ◽  
Author(s):  
Konstantina Filippopoulou ◽  
Carole Couillault ◽  
Vincent Bertrand
Keyword(s):  
Transcription Factors ◽  
Quantitative Imaging ◽  
Terminal Differentiation ◽  
Cholinergic Neurons ◽  
Antagonistic Effect ◽  
Specific Class ◽  
C Elegans ◽  
Neuronal Specification ◽  
Bhlh Transcription Factors ◽  
Deleterious Genes

Neural bHLH transcription factors play a key role in the early steps of neuronal specification in many animals. We have previously observed that the Achaete-Scute HLH-3, the Olig HLH-16 and their binding partner the E protein HLH-2 activate the terminal differentiation program of a specific class of cholinergic neurons, AIY, in C. elegans. Here we identify a role for a fourth bHLH, the Neurogenin NGN-1, in this process, raising the question of why so many neural bHLHs are required for a single neuronal specification event. Using quantitative imaging we show that the combined action of different bHLHs is needed to activate the correct level of expression of the terminal selector transcription factors TTX-3 and CEH-10 that subsequently initiate and maintain the expression of a large battery of terminal differentiation genes. Surprisingly, the different bHLHs have an antagonistic effect on another target, the proapoptotic BH3-only factor EGL-1, normally not expressed in AIY and otherwise detrimental for its specification. We propose that the use of multiple neural bHLHs allows robust neuronal specification while, at the same time, preventing spurious activation of deleterious genes.

Ebf1 controls early cell differentiation in the embryonic striatum

Development ◽  
1999 ◽  
Vol 126 (23) ◽  
pp. 5285-5294 ◽  
Author(s):  
S. Garel ◽  
F. Marin ◽  
R. Grosschedl ◽  
P. Charnay
Keyword(s):  
Transcription Factors ◽  
Cell Differentiation ◽  
Neuronal Differentiation ◽  
Regulatory Proteins ◽  
Targeted Disruption ◽  
Ventral Telencephalon ◽  
Molecular Identity ◽  
Helix Loop Helix ◽  
The Family ◽  
Mantle Cell

Ebf1/Olf-1 belongs to a small multigene family encoding closely related helix-loop-helix transcription factors, which have been proposed to play a role in neuronal differentiation. Here we show that Ebf1 controls cell differentiation in the murine embryonic striatum, where it is the only gene of the family to be expressed. Ebf1 targeted disruption affects postmitotic cells that leave the subventricular zone (SVZ) en route to the mantle: they appear to be unable to downregulate genes normally restricted to the SVZ or to activate some mantle-specific genes. These downstream genes encode a variety of regulatory proteins including transcription factors and proteins involved in retinoid signalling as well as adhesion/guidance molecules. These early defects in the SVZ/mantle transition are followed by an increase in cell death, a dramatic reduction in size of the postnatal striatum and defects in navigation and fasciculation of thalamocortical fibres travelling through the striatum. Our data therefore show that Ebf1 plays an essential role in the acquisition of mantle cell molecular identity in the developing striatum and provide information on the genetic hierarchies that govern neuronal differentiation in the ventral telencephalon.

Anterior pituitary cells defective in the cell-autonomous factor, df, undergo cell lineage specification but not expansion

Development ◽  
1996 ◽  
Vol 122 (1) ◽  
pp. 151-160 ◽  
Author(s):  
P.J. Gage ◽  
M.L. Roller ◽  
T.L. Saunders ◽  
L.M. Scarlett ◽  
S.A. Camper
Keyword(s):  
Anterior Pituitary ◽  
Cell Lineage ◽  
Cell Types ◽  
Limited Commitment ◽  
Recessive Mutation ◽  
Pituitary Cells ◽  
Lineage Specification ◽  
Ames Dwarf ◽  
Dependent Cell ◽  
A Cell

The Ames dwarf mouse transmits a recessive mutation (df) resulting in a profound anterior pituitary hypocellularity due to a general lack of thyrotropes, somatotropes and lactotropes. These cell types are also dependent on the pituitary-specific transcription factor, Pit-1. We present evidence that expression of Pit-1 and limited commitment to these cells lineages occurs in df/df pituitaries. Thus, the crucial role of df may be in lineage-specific proliferation, rather than cytodifferentiation. The presence of all three Pit-1-dependent cell types in clonally derived clusters provides compelling evidence that these three lineages share a common, pluripotent precursor cell. Clusters containing different combinations of Pit-1-dependent cell types suggests that the Pit-1+ precursor cells choose from multiple developmental options during ontogeny. Characterization of df/df<-->+/+ chimeric mice demonstrated that df functions by a cell-autonomous mechanism. Therefore, df and Pit-1 are both cell-autonomous factors required for thyrotrope, somatotrope and lactotrope ontogeny, but their relative roles are different.

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