Immunohistochemical Analysis of GDNF and Its Cognate Receptor GFRα-1 Protein Expression in Vitiliginous Skin Lesions

2015 ◽  
Vol 20 (2) ◽  
pp. 130-134 ◽  
Author(s):  
Mohamed A. Adly ◽  
Hanan A. Assaf ◽  
Shaima’a F. Abdel-Rady ◽  
Nagwa Sayed Ahmed ◽  
Mahmoud Rezk Abdelwahed Hussein
Keyword(s):  
Protein Expression ◽  
Basal Cell ◽  
Cell Layer ◽  
Expression Patterns ◽  
Granular Cell ◽  
Epidermal Keratinocytes ◽  
Healthy Skin ◽  
Granular Cell Layer ◽  
Cognate Receptor ◽  
Spinous Layer

Background: Vitiligo is an idiopathic skin disease, characterized by circumscribed white macules or patches on the skin due to loss of the functional melanocytes. Glial cell line–derived neurotrophic factor (GDNF) and its cognate receptor (GFRα-1) are distal members of the transforming growth factor-β superfamily. GDNF, produced by the basal cell keratinocytes, is involved in the migration and differentiation of the melanocytes from the neural crest to the epidermis. This study examines the hypothesis that expression of GDNF protein and its cognate receptor GFRα-1 protein is altered in vitiliginous skin. Patients and Methods: To test our hypothesis, we examined the expression patterns of these proteins in vitiliginous and corresponding healthy (control) skin biopsies (20 specimens each) using immunoperoxidase staining techniques. Results: We found variations between the vitiliginous skin and healthy skin. In healthy skin, the expression of GDNF and GFRα-1 proteins was strong (basal cell keratinocytes and melanocytes), moderate (spinous layer), and weak (granular cell layer). In contrast, weak expression of GDNF protein was observed in all epidermal layers of vitiliginous skin. GFRα-1 protein expression was strong (basal cell keratinocytes and melanocytes), moderate (spinous layer), and weak (granular cell layer). In both healthy skin and vitiliginous skin, the expression of GDNF and GFRα-1 proteins was strong in the adnexal structures. Conclusions: We report, for the first time, decreased expression of GDNF proteins in the epidermal keratinocytes of vitiliginous skin. Our findings suggest possible pathogenetic roles for these proteins in the development of vitiligo. The clinical ramifications of these observations mandate further investigations.

Transcriptome differentiation along the dorso–ventral axis in laser-captured microdissected rat hippocampal granular cell layer

Neuroscience ◽  
2010 ◽  
Vol 170 (3) ◽  
pp. 731-741 ◽  
Author(s):  
T. Christensen ◽  
C.F. Bisgaard ◽  
H.B. Nielsen ◽  
O. Wiborg
Keyword(s):  
Cell Layer ◽  
Granular Cell ◽  
Granular Cell Layer

Characterization of NADPH Diaphorase- and Doublecortin-Positive Neurons in the Lizard Hippocampal Formation

2016 ◽  
Vol 88 (3-4) ◽  
pp. 222-234 ◽  
Author(s):  
Matheus Macedo-Lima ◽  
Marco Aurélio M. Freire ◽  
Hugo de Carvalho Pimentel ◽  
Lívia Cristina Rodrigues Ferreira Lins ◽  
Katty Anne Amador de Lucena Medeiros ◽  
...  
Keyword(s):  
Cell Layer ◽  
Hippocampal Formation ◽  
Deep Layer ◽  
Granular Cell ◽  
Nadph Diaphorase ◽  
Granular Cell Layer ◽  
Medial Cortex ◽  
Important Input ◽  
Dendritic Complexity

The lizard cortex has remarkable similarities with the mammalian hippocampus. Both regions process memories, have similar cytoarchitectural properties, and are important neurogenic foci in adults. Lizards show striking levels of widespread neurogenesis in adulthood and can regenerate entire cortical areas after injury. Nitric oxide (NO) is an important regulatory factor of mammalian neurogenesis and hippocampal function. However, little is known about its role in nonmammalian neurogenesis. Here, we analyzed the distribution, morphology, and dendritic complexity (Neurolucida reconstructions) of NO-producing neurons through NADPH diaphorase (NADPHd) activity, and how they compare with the distribution of doublecortin-positive (DCX+) neurons in the hippocampal formation of the neotropical lizard Tropidurus hispidus. NADPHd-positive (NADPHd+) neurons in the dorsomedial cortex (DMC; putatively homologous to mammalian CA3) were more numerous and complex than the ones in the medial cortex (MC; putatively homologous to the dentate gyrus). We found that NADPHd+ DMC neurons send long projections into the MC. Interestingly, in the MC, NADPHd+ neurons existed in 2 patterns: small somata with low intensity of staining in the outer layer and large somata with high intensity of staining in the deep layer, a pattern similar to the mammalian cortex. Additionally, NADPHd+ neurons were absent in the granular cell layer of the MC. In contrast, DCX+ neurons were scarce in the DMC but highly numerous in the MC, particularly in the granular cell layer. We hypothesize that NO-producing neurons in the DMC provide important input to proliferating/migrating neurons in the highly neurogenic MC.

Interleukin-1 of Cholesteatomatous Keratinocytes

1992 ◽  
Vol 101 (10_suppl) ◽  
pp. 32-38 ◽  
Author(s):  
Hiromu Kakiuchi ◽  
Yutaka Katoh ◽  
Kazuya Kinoshita ◽  
Toshihide Tabata
Keyword(s):  
Bone Resorption ◽  
Basal Cell ◽  
Cell Layer ◽  
Interleukin 1 ◽  
Epidermal Keratinocytes ◽  
Basal Cell Layer ◽  
Precursor Molecule ◽  
Relationship Of ◽  
The Relationship ◽  
Osteoclast Activating Factor

Interleukin-1 (IL-1) has been thought to be one of the essential cytokines mainly produced by macrophages. It has recently been reported that epidermal keratinocytes produce IL-1, and attention is being paid to local immune reactions mediated with this cytokine. Interleukin-1 not only activates lymphocytes, but also acts as an osteoclast-activating factor. In this study, we used immunohistochemistry and immunoblotting on cholesteatomatous epithelium with anti-IL-1α antibody and anti-IL-1β antibody. Next, the relationship of cholesteatomatous debris to the production of IL-1 by keratinocytes was evaluated. Highly concentrated IL-1α was found in the cholesteatomatous epithelium, especially in the basal cell layer. The intensity of IL-1β staining was weaker than that of IL-1α staining. In the immunoblotting study, the 31 kd band, an intracellular immature precursor molecule, was identified. The production of IL-1α from keratinocytes was augmented to a greater degree by cholesteatomatous debris than by lipopolysaccharide or keratin. The keratinocytes did not produce IL-1β. These findings suggest that IL-1α is derived from cholesteatomatous keratinocytes. Interleukin-1, mainly IL-1α, from the stimulated cholesteatomatous keratinocytes may be an important factor in the markedly increased bone resorption observed in cholesteatoma.

Uremic solutes of indoxyl sulfate and p-cresol enhance protease-activated receptor-2 expression in vitro and in vivo in keratinocytes

2020 ◽  
Vol 40 (1) ◽  
pp. 113-123
Author(s):  
SJ Kim ◽  
X Zhang ◽  
SB Cho ◽  
CH Kim ◽  
HC Park ◽  
...  
Keyword(s):  
Protein Expression ◽  
Trypsin Inhibitor ◽  
Expression Patterns ◽  
Indoxyl Sulfate ◽  
Soybean Trypsin Inhibitor ◽  
Epidermal Keratinocytes ◽  
Uremic Pruritus ◽  
Mrna And Protein Expression ◽  
Uremic Solutes ◽  
Protease Activated Receptor 2

Objectives: Uremic pruritus is common in patients with chronic kidney disease (CKD). The retention of uremic solutes is thought to be associated with uremic pruritus. Meanwhile, activation of protease-activated receptor-2 (PAR-2) has been suggested to play an important role in pruritus. The present study was performed to investigate the effects of uremic solutes on the expression of PAR-2 in the skin. Methods: Indoxyl sulfate (IS), p-cresol (PC), and uremic sera from CKD patients were used to stimulate PAR-2 expression in normal human epidermal keratinocytes (NHEKs). Also, NHEKs were additionally pretreated with soybean trypsin inhibitor to evaluate its inhibitory effect on PAR-2 expression. Patterns of cutaneous PAR-2 expression were investigated in skin samples from five CKD patients and CKD mice. Results: In NHEKs, IS, PC, and sera from CKD patients significantly induced PAR-2 mRNA and protein expression. Soybean trypsin inhibitor significantly decreased PAR-2 mRNA and protein expression in NHEKs treated with IS, PC, and CKD sera. NHEKs treated with IS and PC exhibited significant increases in protease activity. Skin from both CKD patients and mice exhibited marked upregulation of PAR-2 expression compared to control skin. Conclusions: Results from the present study suggest that uremic solutes either directly or indirectly affect PAR-2 expression in the skin of CKD subjects, potentially playing an important role in the pathogenesis of uremic pruritus.

scholarly journals Neuronal precursor cells with dopaminergic commitment in the rostral migratory stream of the mouse

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Kerstin Schweyer ◽  
Corinna Rüschoff-Steiner ◽  
Oscar Arias-Carrión ◽  
Wolfgang H. Oertel ◽  
Thomas W. Rösler ◽  
...  
Keyword(s):  
Subventricular Zone ◽  
Cell Layer ◽  
Granular Cell ◽  
Rostral Migratory Stream ◽  
Physical Barrier ◽  
Short Term ◽  
Term Survival ◽  
Granular Cell Layer ◽  
Migratory Stream

Abstract Neuroblasts born in the subventricular zone of adult mammals migrate via the rostral migratory stream into the granular cell layer or periglomerular layer of the olfactory bulb to differentiate into interneurons. To analyze if new neurons in the granular cell layer or periglomerular layer have different origins, we inserted a physical barrier into the rostral migratory stream, depleted cell proliferation with cytarabine infusions, labeled newborn cells with bromodeoxyuridine, and sacrificed mice after short-term (0, 2, or 14 days) or long-term (55 or 105 days) intervals. After short-term survival, the subventricular zone and rostral migratory stream rapidly repopulated with bromodeoxyuridine+ cells after cytarabine-induced depletion. Nestin, glial fibrillary acidic protein and the PAX6 were expressed in bromodeoxyuridine+ cells within the rostral migratory stream downstream of the physical barrier. After long-term survival after physical barrier implantation, bromodeoxyuridine+ neurons were significantly reduced in the granular cell layer, but bromodeoxyuridine+ and dopaminergic neurons in the periglomerular layer remained unaffected by the physical barrier. Thus, newborn neurons for the granular cell layer are mainly recruited from neural stem cells located in the subventricular zone, but new neurons for the periglomerular layer with dopaminergic predisposition can rise as well from neuronal stem or precursor cells in the rostral migratory stream.

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