We have studied the effects of excitatory amino acids on the expression of the c-fos and c-jun mRNA in rat C6 glioma cells. The glutamate, $N-methyl-_D-aspartate$ (NMDA), and kainic acid (KA) increased c-fos mRNA level in a concentration-dependent manner. However, they did not affect c-jun mRNA level. In addition, forskolin and phorbol 12-myristate 13-acetate (PMA) increased c-fos mRNA level. Furthermore, PMA increased c-jun mRNA level whereas forskolin downregulated c-jun mRNA level. The glutamate, NMDA and KA, at a concentration of 0.25 mM, did not affect the basal c-fos and c-jun mRNA levels, and also did not affect forskolin- and PMA-induced responses. Furthermore, both forskolin and PMA itself increased the phosphorylation of ERK (extracellular signal regulated kinase) and CREB (cyclicAMP responsible element binding protein) proteins. The KA, NMDA, and glutamate did not affect forskolin- induced increase of ERK and CREB phosphorylation. The KA decreased PMA-induced increase of phosphorylation of ERK and CREB proteins, whereas glutamate and NMDA did not affect the phosphorylation of ERK and CREB proteins induced by PMA. These findings suggest that, in C6 glioma cells, c-fos mRNA induction induced by EAAs is not mediated by phosphorylation of ERK and CREB proteins.
This study was conducted to investigate the effects of dietary supplementation of mannan-oligosaccharides (MOS) and fructo-oligosaccharides (FOS) on the performance, immune response and small intestinal microflora in laying hens. A total of 960 Hy-Line $Brown^{(R)}$ laying hens of 27 wks old, housed in 2 bird cages, were assigned in a completely randomized block design into one of the following 6 dietary treatments: control, antibiotic (6 ppm avilamycine), 0.025% MOS, 0.05% MOS, 0.25% FOS, and 0.5% FOS. Each treatment had 4 replicates of 40 birds and was fed ad libitum for 6 wks under 16 h lighting regimen. There were significant differences among treatments in hen-day and hen-housed egg production. Hen-day egg production in 0.025% MOS was significantly higher than that of control. Hen-housed egg production in antibiotic-treated group was significantly higher compared with control. Egg weight, feed intake and feed conversion were not significantly different among treatments. Egg shell thickness was highest in 0.25% FOS, but was not significantly different among the rest of treatments. There were no significant differences among treatments in egg shell strength, egg shell color, egg yolk color and Haugh unit. IgG concentrations in serum were not significantly different among treatments. On the other hand, IgA concentrations of the treated birds tended to be increased compared with control. Dietary treatments tended to decrease Cl. perfringens and E. coli, and to increase Lactobacillus spp. The result of this experiment showed that dietary supplementation of MOS and FOS in laying hens tended to improve egg production comparable to the supplementation of antibiotics. The level of serum IgA and small intestinal microflora were also significantly affected by the treatments.
The characteristics of sponge cakes prepared with replacement of 30, 50, 75, or 100% of sucrose with isomaltooligosaccharide (IOS), fructooligosanharide (FOS), maltitol symp (MS), or maltitol powder (MP), were examined through physical measurement and sensory evaluation. The specific gravities of foams and cake batters were not significantly different among samples (p .0.05). The use of IOS increased the viscosity of cake batter. The cakes containing IOS, FOS, MS, or MP were softer than control cakes (sucrose 100%). Especially cakes prepared with 30, 50% IOS, or 75, 100% MP, appeared to be fragile. When increasing levels of IOS or FOS were incorporated in the cake formula, cake crust color was getting darker than that of control cake, whereas cake containing maltitol was getting lighter as the levels of replacement increased. Generally, the volume of cake containing FOS were superior to that of control cake, whereas those of cakes containing above 50% MP were inferior. Sensory analysis of experimental cakes did not show significant differences from the control cake for softness, springiness and gumminess. Sweetness increased replacing the sucrose with FOS, MS or MP (30, 50%) and moistness increased using IOS, FOS, MS, or MP without agreement with moisture contents of cakes. Replacement of 30, 50% sucrose with MS or 30% with MP did not affect greatly the physical measurements or sensory characteristics studied.
Background: After an injury to tissue such as the skin, hyperalgesia develops. Hyperalgesia is characterized by an increase in the magnitude of pain evoked by noxious stimuli. It has been postulated that in the mechanism of hyperalgesia (especially secondary hyperalgesia) and allodynia, a sensitization of central nervous system such as spinal dorsal horn may contribute to development of hyperalgesia. However, the precise mechanism is still unclear. In the present study, we investigated the roles of N-methyl-D-aspartate (NMDA) receptor and nitric oxide (NO) system in the mechanism of hyperalgesia, and their relations with c-fos expression Methods: Inflammation was induced by injection of complete Freund adjuvant (CFA) into unilateral hindpaw of Sprague-Dawley rat. Behavioral studies measuring paw withdrawal responses by von Frey filaments and paw withdrawal latencies by radiant heat stimuli and stainings of nicotinamide adenine dinucleotide phosphate (NADPH)-diaphorase and c-fos immunoreactivity were performed. The effects of MK-801, an NMDA receptor blocker and $N^\omega$-nitro-L-arginine (L-NNA), a nitric oxide synthase (NOS) inhibitor were evaluated. Results: 1) Injection of CFA induced mechanical allodynia, mechanical hyperalgesia and thermal hyperalgesia. And it increased the number of NADPH-diaphorase positive neurons and c-fos expression neurons. 2) MK-801 inhibited mechanical hyperalgesia and thermal hyperalgesia induced by CFA and reduced the number of NADPH-diaphorase positive neurons and c-fos expression neurons. 3) L-NNA inhibited the thermal hyperalgesia and reduced the number of NADPH-diaphorase positive neurons, but did not affect the number of c-fos expression neurons. Conclusions: These results suggest that in the mechanism of mechanical hyperalgesia, NMDA receptor but not NO-system is involved and in the case of thermal hyperalgesia both NMDA receptor and NO system are involved. NO system did not affect the expression of c-fos, but c-fos expression and NOS activity were dependent on the activity of NMDA receptor.
Objectives: Colitis is an inflammatory bowel disease characterized by colonic mucosal inflammation and chronic relapsing events represents. The purpose of this study is to evaluate effects of pharmacopuncture of anti-inflammatory herbal compound (AiC) applied to the different acupoints in the acute colitis induced by trinitrobenzenesulphonic acid (TNBS) intracolonic injection in rats. Methods: In Male Sprague - Dawley rats, weighing 250~400g, TNBS (5 mg/kg) was infused intrarectally through a silicon rubber catheter into the anus under isoflurane anaesthesia. Acupoints of LI4 (Hapkok), ST25 (Cheonchu), ST36 (Joksamni), and BL25 (Daejangsu) were intramuscularly injected by AiC, respectively (injection volume & times: 0.2 ml / acupoint, twice times on the 2nd & 3rd day). Expressions of cFos protein in the periaqueductal gray (PAG), locus coeruleus (LC), nucleus of solitary tract (Sol), and the 6th lumbar spinal cord (L6 s.c.) were observed at 24 hr after TNBS induced colitis by immunohistochemistry. Results: The expression of c-Fos protein in the L6 s.c., Sol, LC and PAG increased 24 hr after TNBS injection into colorectum as compared to normal and 50% ethanol treated group. AiC to LI4 inhibited the expression of c-Fos protein in Sol and PAG but not L6 s.c. and LC. AiC to ST36 showed significant inhibition the c-Fos expression in L6 s.c., Sol and PAG. AiC to ST25 only showed the effects in L6 s.c. and PAG. AiC to BL25 inhibited significantly the expression of c-Fos protein all over the areas. To investigate whether or not endogenous opioids are involved, intrathecal injection of naltrexone (30ug/30ul) was applied before the 2nd pharmacopuncture treatment 24 hr after TNBS-induced colitis in rat. Naltrexone reversed the inhibition of c-Fos protein expression in the spinal cord and brainstem. Conclusions: These data show that pharmacopuncture of Aic potently inhibits signal pathways ascending hypersensitivity of colorectum after TNBS induced colitis and depends on the endogenous opioids according to acupoints.
Objective: We have studied to know effects of acupuncture at SI3, BL40, SI3 BL40 on mechnical allodynia, cold allodynia and c-fos protein expression in a model of neuropathic pain of rat. Methods: A model of neuropathic pain was made by injuring tibial nerve and sural nerve while common peroneal nerve was maintained. after 2 weeks, we performed behavioral tests for 7 days to try out mechnical allodynia using von frey filament and cold allodynia using acetone, which are calculated by counting withdrawal response on foot. Rat brains removed and sliced on 8th days. Serial sections were immunohistochemically reacted with polyclonal c-fos antibody. The numbers of c-Fos protein immunoreactive neurons in the central gray were examined using scion image program. Results: Mechanical allodynia in the SI3, BL40, SI3 BL40 groups were diminished compared with the control group. Cold allodynia in the SI3, BL40, SI3 BL40 groups were diminished compared with the control group. c-Fos protein expression on the central gray in the SI3 group were lower than that of the control group. Conclusions: We have noticed that acupuncture at SI3, BL40, SI3 BL40 diminished mechanical allodynia and cold allodynia in a model of neuropathic pain compared with the control group. c- Fos protein expression in the central gray of that group was also decreased compared with the control group. pain control using acupunture was accumulated as time goes by. This study can be used as a basic resource on a study and a treatment of pain.
Objectives : This study was to investigate the effect of high frequency electroacupuncture at $ST_{36}$ acupuncture point on the Complete Freund's Adjuvant (CFA) induced rat arthritis pain model. Methods : Arthritis was induced by intradermal injection of CFA into base of tail. Experimental groups were divided into 4 groups; Normal, Control and Jok-Samri ($ST_{36}$) and Non-Acupuncture point (NA). Normal group, non-arthritic group, was injected with normal saline,and the others groups were injected CFA. $ST_{36}$ group was treated by 120 Hz electroacupuncture at $ST_{36}$ acupuncture point, and NA group was treated by 120 Hz electroacupuncture at non-acupuncture point. Each groups were evaluated by the change of c-fos positive neurons in periaqueductal gray (PAG) and hippocampus by using an image analyzer and a microscope. Results: - In the PAG region, the number of fos-positive cells in the $ST_{36}$ group ($42.37{\pm}5.08$) were significantly (p<0.05) decreased compared with the control group ($64.56{\pm}6.35$). - In the PAG region, the number of fos-positive cells in the NA group were meaninglessly decreased compared with the control group - In the Cornu Ammonis(CA)l region of hippocampus, the number of fos-positive cells in the $ST_{36}$ group ($7.00{\pm}1.08$) and NA group ($5.56{\pm}2.01$) were significantly (p<0.05) decreased compared with the control group ($13.81{\pm}1.24$). - In the dentate gyrus region of hippocampus, the number of fos- positive cells in the $ST_{36}$ group ($10.75{\pm}0.98$) and NA group ($6.56{\pm}0.78$) were significantly (p$26.45{\pm}1.82$). Conclusions : It is expected that high frequency electroacupuncture can be used a treatment of arthritic pain.
Objectives : Transient inflammation has been demonstrated to alter visceral sensory function in animal models and acute mucosal inflammation may precede the manifestation of visceral hyperalgesia. Thus in this study we compared effects of herbal acupuncture of Nidus Vespae (NV) applied to the different acupoints in the acute colitis induced by trinitrobenzenesulphonic acid (TNBS) intracolonic injection in rats. Methods : In Male Sprague-Dawley rats, weighing 250 ~ 400 g, TNBS (5 mg/kg) was infused intrarectally through a silicon rubber catheter into the anus under isoflurane anaesthesia. Under general anesthesia, acupoints of LI4 (Hapkok), SI25 (Cheonchu), ST36 (Joksamni), BL25 (Daejangsu) were intramuscularly injected by NV. Expressions of cFos protein in the periaqueductal gray (PAG), locus coeruleus (LC), nucleus of solitary tract (Sol), and the 6th lumbar spinal cord (L6 s.c.) were observed at 24 hrs after TNBS induced colitis by immunohistochemistry. Results : The expression of c-Fos protein in L6 s.c., Sol, LC and PAG increased 24 hrs after TNBS injection into colorectum as compared to normal group. NV herbal acupuncture also inhibited the expression of c-Fos protein in Sol but not L6 s.c., LC, and PAG. NV to ST36 inhibited significantly the c-Fos expression in Sol and PAG. NV to ST25 inhibited the c-Fos protein expression all over the observation area. NV to BL25 showed the inhibitory effects in the areas except LC. Whether or not a role of endogenous opioids, intrathecal injection of naltrexone (30 ug / 30 ul) was applied before the 2nd herbal acupuncture treatment 24 hrs after TNBS-induced colitis in rat. Naltrexone reversed the inhibition of c-Fos protein expression in the spinal cord and brainstem under different conditions such as type of herbal acupuncture compound and choice of acupoint. Conclusions : In summary, these data show that herbal acupuncture of NV inhibits signal pathways such as spinal cord and brain stem ascending hypersensitivity of colorectum after TNBS induced colitis. This effect may be mediated by acupoints through the endogenous opioid system involving the pain modulation.
This study was performed, using c-fos, to investigate the effect of TENS on pain model induced by capsaicin in spinal level. Twelve rats with 200-250g body weight were randomly divided into three groups: One group which induced by capsaicin, another group which applicated TENS with low frequency(4Hz. 200${\mu}$s, 20min) and the other group which applicated TENS with high frequency(100Hz, 50${\mu}$s, 20 min). The results of this study were as follows: 1. The number of c-fos immunoreactive neurons in superficial dorsal horn was increased markedly 2 hours after capsaicin injection, and decreased gradually from 4 hours to 16 hours after injection. 2. At 2hours after capsaicin injection, both low frequency and high frequency TENS decrease the number of c-fos immunoreactive neurons in superficial dorsal horn .3. In acute pain model, low frequency TENS greatly decrease c-fos expression than high frequency TENS. Therefore. decreasing the number of c-fos immunoreactive neurons which increased after capsaicin injection with application of TENS indicate that both of the TENS have inhibitory effect. In addition. low frequency TENS greatly decreased the number of neurons explains low frequency TENS is more effective than high frequency TENS in acute pain. This study also can become a part of scientific evidence on electrotherapy through measuring quantitively effects of TENS in pain model.
Song, Sun Ok;Seok, Je Hong;Lee, Deok Hee;Park, Dae Pal;Kim, Seong Yong;Lim, Jeong Sook;Song, Sun Kyo;Lee, Nam Hyuk
The Korean Journal of Pain
/
v.18
no.2
/
pp.124-132
/
2005
Background: This study was performed to evaluate the dose-related effects of naloxone on morphine analgesia in the rat formalin test, and observe the correlation of pain behavior and spinal c-fos expression induced by a formalin injection. Methods: Fifty rats were divided into five groups; control, morphine (morphine pre-treated, intra-peritoneal injection of 0.1 mg of morphine 5 min prior to formalin injection), and three naloxone groups, which were divided according to the administered dose-ratio of naloxone to morphine 20 : 1 ($5{\mu}g$), 10 : 1 ($10{\mu}g$), and 1 : 1 ($100{\mu}g$) representing the low-, medium-, and high-dose naloxone groups, respectively, were injected intra-peritoneally 16 min after a formalin. A fifty ul of 5% formalin was injected into the right hind paw. All rats were observed for their pain behavior according to the number of flinches during phases 1 (2-3, 5-6 min) and 2 (1 min per every 5 min from 10 to 61 min). The spinal c-fos expression was quantitatively analyzed at 1 and 2 hours after the formalin injection using a real-time PCR. Results: The morphine pre-treated (morphine and three naloxone) groups during phase 1, and the morphine, low- and medium-dose naloxone groups during phase 2, showed significantly less flinches compared to those of the control (P < 0.05). In the three naloxone groups, the numbers of flinches were transiently reduced following the naloxone injection in the low- and medium-dose groups compared to those of the morphine group (P < 0.05). The duration of the reduced flinches was longer in the medium-dose group (P < 0.05). The high-dose group revealed immediate increases in flinches immediately after the naloxone injection compared to those of the morphine, low- and medium-dose groups (P < 0.05 for each). The spinal c-fos expression showed no significant patterns between the experimental groups. Conclusions: Our data suggest that relatively low-dose naloxone (1/20 to 1/10 dose-ratio of morphine) transiently potentiates morphine analgesia; whereas, high-dose (equal dose-ratio of morphine) reverses the analgesia, and the spinal c-fos expression does not always correlate with pain behavior in the rat formalin test.
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