Development of Gonadotropes in the Chicken Embryonic Pituitary Gland

Maseki, Yoko; Nakamura, Kazuaki; Iwasawa, Atsushi; Zheng, Jun; Inoue, Kinji; Sakai, Takafumi

doi:10.2108/zsj.21.435

Cited by 27 publications

(11 citation statements)

References 26 publications

(27 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, several studies in chick have described expression patterns of various signaling molecules and transcription factors during the course of hypophyseal placode invagination and in Rathke's pouch, as well as hormone expression in the adenohypophysis (Maseki et al . ; Ellestad et al . ; Sjodal & Gunhaga ; Takagi et al .…”

Section: Individual Cranial Placodesmentioning

confidence: 99%

Development of cranial placodes: Insights from studies in chick

Jidigam

Gunhaga

2012

Dev Growth Differ

View full text Add to dashboard Cite

This review focuses on how research, using chick as a model system, has contributed to our knowledge regarding the development of cranial placodes. This review highlights when and how molecular signaling events regulate early specification of placodal progenitor cells, as well as the development of individual placodes including morphological movements. In addition, we briefly describe various techniques used in chick that are important for studies in cell and developmental biology.Key words: border, chick, invagination, placodes, signaling. Chick as a model system to unravel the development of cranial placodesCranial placodes are transient thickenings of the embryonic head ectoderm at specific positions that can be detected during vertebrate development. Cranial placodes found in chick are the hypophyseal, olfactory, lens, trigeminal, otic and epibranchial ( Fig. 1). All of these placodes, except the hypophyseal, will contribute to sensory components of the peripheral nervous system (PNS), and are usually referred to as sensory placodes. The hypophyseal placode will eventually form the endocrine part of the pituitary. Among the sensory placodes, the lens is the only placode that will not give rise to any neuronal derivatives. The individual placodes will give rise to specific cell types, and together the placodes form a variety of cell types including sensory receptor cells, neurons, endocrine cells and supporting cells.Cranial placodes derive from the neural plate border (border), a region of the embryonic ectoderm located between the prospective neural and the prospective epidermal domains. Recent studies have shown when and how extracellular signals result in the specification of border cells and the individual specification of various placodes. Although specification of placodal progenitors appears to be partly regulated by common molecular mechanisms, the development and patterning of individual cranial placodes are controlled by unique molecular codes. A key question during development of any tissue or organ is how a cell adopts one fate over another. Equally important is to understand how morphological movements occur, forming tissues and organs in specific shapes. The development of placodes includes both of these developmental processes, and these events must be strictly coordinated to form functional mature structures. To analyze the acquisition of cell identity and morphological movements, various molecular and developmental biology techniques in chick can be used, which are briefly mentioned in Box 1. This review, which focus on results from chick, can be used as a complement to existing reviews concerning placode development (Baker & Bronner-Fraser 2001;Streit 2004Streit , 2007Brugmann & Moody 2005;Schlosser 2006Schlosser , 2008Schlosser , 2010Ohyama et al. 2007;Sauka-Spengler & Bronner-Fraser 2008;McCabe & Bronner-Fraser 2009;Ladher et al. 2010;Gunhaga 2011;Patthey & Gunhaga 2011). In the following sections, we discuss recent progress concerning early development of cranial placodes using chick as ...

show abstract

Section: Individual Cranial Placodesmentioning

confidence: 99%

Development of cranial placodes: Insights from studies in chick

Jidigam

Gunhaga

2012

Dev Growth Differ

View full text Add to dashboard Cite

show abstract

“…ISH method ISH was performed as described elsewhere (Maseki et al 2004). Briefly, sagittal sections of 20 μm in thickness were cut by using a Cryostat CM1850 (Leica Microsystems Nussloch, Heidelberg, Germany) and mounted on 3-aminopropyltriethoxysilane-coated slides.…”

Section: Rna Probe Preparationmentioning

confidence: 99%

Detailed analysis of formation of chicken pituitary primordium in early embryonic development

et al. 2008

Self Cite

View full text Add to dashboard Cite

The primordium of the mammalian adenohypophysis derived from Rathke's pouch (RP) is known to be formed by oral ectoderm invagination. However, in the early phase of pituitary development, the detailed process by which the oral ectoderm develops into the adenohypophysis remains largely unknown. Using high-resolution non-radiolabeled in situ hybridization and the BrdU and TUNEL methods, we have examined the detailed expression pattern of factors involved in the formation of RP of chicken and the changes in the mitotic and apoptotic cell regions in RP. In the chicken embryo, Sonic hedgehog (Shh) mRNA was initially expressed in the stomodeal plate but not in the oral ectoderm. After prospective diencephalon had detached from the oral ectoderm, another Shh-expressing region appeared in the most rostral part of the recess. LIM homeobox gene 3 (Lhx3) mRNA first appeared in the anterior area of Rathke's recess, and expression then spread to the caudal region. alphaGSU mRNA-expressing cells were observed at both ends of the Lhx3-expressing region, and thereafter the expression area moved to the posterior region. Furthermore, a close overlap was found between the proliferating region and Lhx3 mRNA-expressing area, and TUNEL-positive cells appeared in Seessel's pouch derived from the foregut. Thus, the primordium of the pituitary gland corresponding to the Lhx3-expressing region is surrounded by the Shh-expressing region, which appears in two steps, and the mass growth and invagination of RP of chicken result from the coordination of the dorsal extension of the anterior region and the ventral extension of the posterior region of RP.

show abstract

“…The posterior parts of the eyes were sectioned at 10-m thickness, collected on MAS-coated slides (Matsunami, Osaka, Japan), and processed as previously reported. 17,18 Briefly, the sections were washed with PBS and treated with 2 g/ml Proteinase K for 30 minutes at 37°C. They were fixed with 4% PFA in PB for 10 minutes, treated with 0.2 mol/L HCl for 10 minutes, and then treated with 0.25% acetic anhydride in 0.1 mol/L triethanol amine for 10 minutes.…”

Section: In Situ Hybridizationmentioning

confidence: 99%

Role of Apoptosis Signal-Regulating Kinase 1 in Stress-Induced Neural Cell Apoptosis in Vivo

Harada

Nakamura

Namekata

et al. 2006

The American Journal of Pathology

Self Cite

104

107

View full text Add to dashboard Cite

Apoptosis signal-regulating kinase 1 (ASK1) is a mitogen-activated protein kinase kinase kinase that plays an important role in oxidative stress-induced apoptosis. In the present study, we used ASK1 knockout (KO) mice to examine the possibility that ASK1 is involved in the neural cell apoptosis that occurs during retinal development and ischemic injury. ASK1 was expressed in retinal neurons, including retinal ganglion cells (RGCs), but retinal structure and extent of cell death during development were normal in ASK1 KO mice. On the other hand, the strain was less susceptible to ischemic injury, and the number of surviving retinal neurons was significantly increased compared with that in wild-type mice. Interestingly, ischemia-induced phosphorylation of p38 mitogen-activated protein kinase (p38), which mediates RGC apoptosis, was almost completely suppressed in ASK1 KO mice. In such retinas, the numbers of cleaved caspase-3-and TUNEL-positive neurons were apparently decreased compared with those in wild-type mice. Furthermore, cultured RGCs from ASK1 KO mice were resistant to H 2 O 2 -induced apoptosis. Our findings suggest that ASK1 is involved in the neural cell apoptosis after various kinds of oxidative stress. Thus, inhibition of the ASK1-p38 pathway could be useful for the treatment of neurodegenerative diseases including glaucoma. (Am J

show abstract

Development of Gonadotropes in the Chicken Embryonic Pituitary Gland

Cited by 27 publications

References 26 publications

Development of cranial placodes: Insights from studies in chick

Development of cranial placodes: Insights from studies in chick

Detailed analysis of formation of chicken pituitary primordium in early embryonic development

Role of Apoptosis Signal-Regulating Kinase 1 in Stress-Induced Neural Cell Apoptosis in Vivo

Contact Info

Product

Resources

About