• Title/Summary/Keyword: c-Fos

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A Brief Introduction to the Transduction of Neural Activity into Fos Signal

  • Chung, Leeyup
    • Development and Reproduction
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    • v.19 no.2
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    • pp.61-67
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    • 2015
  • The immediate early gene c-fos has long been known as a molecular marker of neural activity. The neuron's activity is transformed into intracellular calcium influx through NMDA receptors and L-type voltage sensitive calcium channels. For the transcription of c-fos, neural activity should be strong enough to activate mitogen-activated protein kinase (MAPK) signaling pathway which shows low calcium sensitivity. Upon translation, the auto-inhibition by Fos protein regulates basal Fos expression. The pattern of external stimuli and the valence of the stimulus to the animal change Fos signal, thus the signal reflects learning and memory aspects. Understanding the features of multiple components regulating Fos signaling is necessary for the optimal generation and interpretation of Fos signal.

Effect of Pini Folium Extract on AP-1 (c-fos/c-jun) in Cancer Cells (암세포에서 송엽의 AP-l (c-fos/c-jun)에 미치는 영향)

  • 박건구;장혜숙;이정교;최승훈
    • YAKHAK HOEJI
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    • v.43 no.1
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    • pp.42-47
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    • 1999
  • Phorbol ester, growth factors activities are mediated by unclear transcription factors, the c-Fos and c-Jun, which can regulate transcriptional activation through specific DNA sites and by forming the transcription factor AP-l, which usually mediates cell proliferation and differentiation signals. We explored effects of Pini Folium extract (API-l) on AP-l activity. Western blot analysis confirmed that API-l decreased levels of c-Fos or c-Jun protein induced by the tumor promoter Phorbol 12-myristate 13-acetate (PMA; 200 nM). Transient transfection assays with a c-fos promoter reporter construct showed that API-l decreased transcription activity by ore than 50~60%. However, treatment of API-l activity studied further. The main substances were fractionated into dichloromethane layer. Futhermore, API-l extract repressed the [$^3H$]-thymidine uptake in C6 glioma cells, indicating that this extract could be included in a new type of modulator in the mitogenesis.

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Systemic Injection of Lidocaine Induce Expression of c-fos mRNA and Protein in Adult Rat Brain

  • Chae, Han-Jung;Kang, Jang-Sook;Cho, Seoung-Bum;Jin, Byung-Gwan;Won, Suk-Jun;Gwag, Byung-Joo;Kim, Hyung-Ryong
    • The Korean Journal of Physiology and Pharmacology
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    • v.3 no.1
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    • pp.69-74
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    • 1999
  • Both direct and indirect environmental stress to brain were increase the expression of transcription factor c-fos in various populations of neurons. In this study, we examined whether the intraperitoneal injections of lidocaine at doses inducing convulsion within 10 min increased the level of c-fos mRNA and protein in forebrain areas. In situ hybridization using $[^{35}S]UTP-labeled$ antisense c-fos, cRNA increased c-fos mRNA levels though hippocampal formation, piriform cortex, septum, caudate-putamen, neostriatum, and amygdala within 2 hr. In parallel with the mRNA expression, c-FOS protein immunoreactivity was also observed in the same forebrain areas. In contrast to the seizure activity and widespread neuronal degeneration following a kainate treatment, injections of lidocaine did not produce neuronal death within 3 days. The present study indicates that lidocaine induces convulsion and c-fos expression without causing neurotoxicity.

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Expression of Multidrug Resistance-associated Protein (MRP), c-myc and c-fos in L1210 Cells (L1210 암세포에서 Multidrug Resistance-associated Protein (MRP), c-myc 및 c-fos 유전자의 발현양상)

  • Kim, Seong-Yong
    • Journal of Yeungnam Medical Science
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    • v.14 no.1
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    • pp.67-76
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    • 1997
  • The occurrence of multidrug resistance (MDR) is one of the main obstacles in the successful chemotherapeutic treatment of cancer. In this study The gene expressions of multidrug resistance-associated protein (MRP), c-myc and c-fos were investigated in L1210 cells. Adriamycin- or vincristine-resistant L1210 cells, L1210AdR or L1210VcR, respectively, has been identified to overexpression of mdr1 gene. The expression leve of MRP gene in L1210AdR and L1210Cis was more decreased than that in L1210 cells. The c-myc and c-fos genes were expressed both in L1210 and resistant sublines. In L1210AdR, the expressions level of c-myc and c-fos genes were decreased than in L1210. However, in L1210VcR and L1210Cis, c-myc and c-fosgene expressionwere rather increased than L1210. These results suggested that MRP does not contribute in resistance of drug-resistant L1210 cells and there is no relations between MRP and mdr1 gene expression. The expression of c-myc and c-fos gene may be changed during transformation of L1210 to drug-resistant sublines.

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A Study on the Effects of Needle Electrode Electrical Stimulation on the Number of c-Fos Response Cells and c-Fos Expression in the Global Ischemic Rats

  • Kim, Sung Won;Song, Young Wha;Lee, Jung Sook
    • Journal of International Academy of Physical Therapy Research
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    • v.7 no.2
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    • pp.1031-1036
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    • 2016
  • c-Fos is known to related to synaptic plasticity and apoptosis in damage from ischemia or external injury. The purpose of this study was to investigate whether needle electrode electrical stimulation(NEES) is effective in increasing the number of c-Fos response cells and c-Fos expression in striatum after global ischemia in rats. There were no treatment and occlusion in the control group, global ischemia(GI) group were no treatment after carotid artery occlusion, and needle electrode electrical stimulation(NEES) group were treated with NEES after GI induced. The number of striatum c-Fos response cells and c-Fos protein expression significantly decreased in the NEES group compared to the GI group after 12, 24, 48 hours. The results of the present study suggest that NEES is ineffective in improving global ischemia in rats and may also be ineffective in the globally ischemic human brain.

Parallel Regulation of Prolactin and c-fos Gene Expression by 17$\beta$-estradiol and Stress in the Mouse Pituitary

  • Kim, Ji-Eune;Ko, Ji-Yun;Kim, Young-il;Yoon, Yong-Dal;Cho, Byung-Nam
    • Animal cells and systems
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    • v.4 no.1
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    • pp.71-76
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    • 2000
  • The aim of this study was to investigate expression patterns of the prolactin (PRL) and c-fos genes by 17$\beta$-estradiol (17$\beta$-E) and stress in the mouse pituitary. In the pituitary, the levels of PRL mRNA were found high with some fluctuation at 30, 50, and 90 min whereas the levels of PRL mRNA were low at 120 min when ovariectomized female mice were injected with 17$\beta$-E or vehicle. PRL mRNA levels began to increase again at 4 h and remained high up to 24 h only in the 17$\beta$-E- treated mice. The overall changes in c-fos mRNA by 17$\beta$-E were very similar to those in PRL mRNA in the pituitary. Subsequent study revealed that these high initial levels of PRL and c-fos mRNAs were caused by stress during Injection, not by 17$\beta$-E, since vehicle injection alone into the ovariectomized mice could increase the levels of PRL and c-fos mRNAs. The stress-induced elevations of PRL and c-fos mRNAs were inhibited by bromocriptin, a dopamine agonist, suggesting that the dopaminergic system is involved in the action route of injection stress. In addition, the induced levels of c-fos mRNA by 17$\beta$-E and stress in the pituitary were very low compared with those in the uterus. The time course changes in c-fos mRNA level were different between the pituitary and uterus. Taken together, these data indicate that PRL and c-tos gene expression in the pituitary are regulated by 17$\beta$-E and stress in a parallel manner, supporting the notion that c-Fos plays a role in regulation of PRL gene expression.

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Differential expression of glycoconjugates, estrogen receptor-α, c-fos and c-jun in the vagina of normal and ovariectomized rat (흰쥐 발정주기와 난소절제에 따른 질상피의 glycoconjugates, estrogen receptor-α, c-fos 및 c-jun 분포변화)

  • 최병태;길영기;김강련;김순옥;최영현;이준혁
    • Journal of Life Science
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    • v.12 no.3
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    • pp.317-324
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    • 2002
  • We investigated the compositional changes of glycoconjugates (GCs) and expression of estrogen receptor (ER)-$\alpha$, c-fos and c-jun in the vagina of normal and ovariectomized rats by histochemical and immunohistochemical methods. The mucinous transformation of the superficial layer that occurred from late diestrus to proestrus was accompanied with extensive enrichment of GCs. According to the cyclic changes of the vagina, distinct reactivity patterns such as SBA affinity in the diestrus and Con A affinity in the diestrus and estrus phase was observed. However, weak staining for GCs was detected in the atrophied vaginal epithelium of ovariectomized rats. ER-$\alpha$ immunoreaction was mainly demonstrated in the basal layer of epithelium and estrus cycle-related variation in the number of ER-$\alpha$ immunoreaction were not pronounced. But the stromal cells showing ER-$\alpha$ immunoreaction were abundantly observed from diestrus to estrus phase. The most numerous c-fos immunoreactive cells were observed in the basal and intermediate layer of epithelium and stromal fells from the proestrus to estrus phase and c-jun in the basal layer of epithelium during estrus phase. The c-jun immunoreaction of stromal cells expressed only in the estrus phase. In the ovariectomized rats, a few of ER-$\alpha$, c-fos and c-jun immunoreactive cells were observed in the vaginal epithelium and no immunoreaction were found in the stromal cells. ER-$\alpha$ and c-fos immunoreaction fully expressed in the proestrus coincident with the cell proliferation, mutinous transformation and cornification of vaginal epithelium. These data indicate that vagina epithelium and stromal reals express multiple protein such as ER-$\alpha$, c-fos and c-iun by estrogen that may function in process of cells proliferation and differentiation of vagina epithelium.

Effect of Daekumeumja Herb-acupuncture on c-Fos Expression in Hippocampus of Alcohol Intoxicated Rats (대금음자 약침이 알코올 독성 흰쥐의 해마에서 c-Fos 발현에 미치는 영향)

  • Lee, Tae-Ho;Lee, Eun-Yong
    • Journal of Acupuncture Research
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    • v.23 no.3
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    • pp.37-45
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    • 2006
  • Objectives : The study was conducted to investigate the effect of Deakumeumja herb-acupuncture on c-Fos expression in each area of the hippocampus of Alcohol intoxicated rats. Methods : Experimental groups were divided into five groups ; normal group, the alcohol-treated (control) group, the alcohol- 1 mg/kg Daekumeumja treated (sample A) group, the alcohol- 5 mg/kg Daekumeumja treated (sample B) group, the alcohol- 10 mg/kg Daekumeumja treated (sample C) group (n = 6 for each group). Rats of normal group were injected intraperitoneally with saline once a day for 5 consecutive days, while animals of the alcohol-treated (control) group were injected once a day with 2 g/kg of alcohol for the same duration of time. Animals of the alcohol and Daekumeumja-treated (sample A, B, C) groups were acupunctured at Chung-wan$(CV_{12})$ with 2 g/kg of alcohol and the appropriate amount of Daekumeumja extract once a day for 5 days. Each groups was evaluated by the changes of c-fos-positive neurons in each area of the hippocampus by using an image analyzer and microscope. Results: 1. In the CAI region of the hippocampus, the number of Fos-positive cells in the sample B, C groups were significantly increased compared with the control group. 2. In the CA2-3 regions of the hippocampus, the number of Fos-positive cells of the sample B, C groups were significantly increased compared with the control group. 3. In the Dentate gyrus region of the hippocampus, the number of Fos-positive cells of the sample C group was significantly increased compared with the control group. Conclusion : c-fos expression in each area of the hippocampus was reduced in alcohol-intoxicated groups. Treatment of Daekumeumja increased this reduction. In conclusion, it can be suggested that Daedumeumja possesses protective effects of the amnesia and learning disability in alcoholism.

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Effect of Puerariae Radix on c-Fos and c-Jun Expressions in Ischemic Damaged Hippocampus of Rats (갈근이 뇌허혈 손상 흰쥐의 뇌해마 c-Fos와 c-Jun 발현에 미치는 영향)

  • Jo Gyu-Chil;Kim Youn Sub
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.18 no.2
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    • pp.538-543
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    • 2004
  • Objective : This study investigated a neuroprotective effect of Puerariae Radix on cerebral ischemia. Method : The global cerebral ischemia was induced by bilateral common carotid arteries occlusion under hypotension (40mmHg) in Sprague-Dawley rats. After the treatment of Puerariae Radix extract, changes of c-Fos and c-Jun expressions, immediate early genes expressed by cerebral ischemia, in the hippocampus were observed immunohistochemically. Result: The results obtained are as follows; The significant increases of c-Fos and c-Jun expressions were observed in the hippocampus of the ischemic damaged rat brains. Then Puerariae Radix treatment demonstrated significant decreases of c-Fos and c-Jun expressions in CA1 region and dentate gyrus as compared with control group. On the upregulated c-Fos expression induced by cerebral ischemia, Puerariae Radix treatment demonstrated significant decreases of c-Fos expressions in CA1 region (P<0.01) and dentate gyrus (P<0.05) as compared to the control group, but there were not a significant changes in CA2 and CA3 regions of the hippocampus. On the upregulated c-Jun expression induced by cerebral ischemia, Puerariae Radix treatment demonstrated significant decrease of c-Jun expression in CA1 region (P<0.05) as compared to the control group, but there were not a significant changes in CA2, CA3, and dentate gyrus of the hippocampus. Conclusion : These results suggested that Puerariae Radix reveals the neuroprotective effect through the reduction of immediate early genes, c-Fos and c-Jun, induced by cerebral ischemia.

Ginseng radix Suppresses Ischemia-induced Increase in c-Fos Expression and Apoptosis in the Hippocampal CA1 Region in Gerbils

  • Park, Keung-Ryol;Jang, Mi-Hyeon;Kim, Chang-Ju;Lee, Choong-Yeol
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.19 no.1
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    • pp.224-229
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    • 2005
  • Ginseng radix, the root of Panax ginseng C.A.Meyer (Araliaceae), has traditionally been used for the treatment of various disorders including cerebrovascular accident (CVA). In the present study, the effect of Ginseng radix on c-Fos expression and apoptosis in the hippocampal CA1 region of gerbils following transient global ischemia was investigated via immunohistochemistry for c-Fos and caspase-3 and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assay. Enhanced c-Fos-, TUNEL-, and caspase-3-positivities were detected in the hippocampal CA1 region in ischemic gerbils. Administration of the aqueous extract of Ginseng radix suppressed this ischemia-induced increment in the numbers of c-Fos-, TUNEL-, and caspase-3-positive cells. These results suggest that Ginseng radix has an inhibitive effect on the induction of c-Fos expression and apoptosis seen following transient global ischemia.