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Objective: To explore the inflammatory factor and inflammation signal pathway in hippocampus of postoperative fatigue syndrome (POFS) rats, and to investigate the central mechanism of POFS and the anti-fatigue effect of ginsenoside Rb1. Methods: Ninety-six male SD rats were randomly divided into control, POFS, and ginsengoside Rb1 intervention groups (ginsengoside Rb1 groups), and each group was divided into subgroups by postoperative 1, 3, 5, and 7 d. The fatigue was assessed with open field test. The mRNA levels of inflammatory cytokines in hippocampus were measured by real-time quantitative PCR. The activation of p38MAPK enzyme was examined by Western blotting and immunohistochemisty. The translocation of NF-κB/p65 in nuclear was measured by Western blotting and immunohistofluorescence. Results: On postoperative day 1 and day 3, compared with the control group, the journey of rats in the POFS group declined (P < 0.01), while resting time increased (P < 0.01), the level of inflammation cytokines added, the expression of p-p38MAPK protein was enhanced and the ratio of NF-κB/p65 cytoplasm/NF-κB/p65/nuclear was also elevated (P < 0.05). Compared with the POFS group, the resting time of rats decreased (P < 0.05) on postoperative day 1 and day 5.On day 1 and day 3 after surgery, the journey of rats was enhanced (P < 0.01), the level of inflammation cytokines was declined and the ratio of NF-κB/p65 cytoplasm/NF-κB/p65/nuclear was decreased (P < 0.05). The levels of p-p38MAPK in postoperative day 3, day 5, and day 7 were also declined (P < 0.05). The results of immunohistochemisty and immunohistofluorescence were accordance with Western blotting. Conclusion: The inflammatory cytokine in hippocampus of POFS rats is increased and the inflammation signal pathway is activated. Ginsenoside Rb1 has some improvement effects on central fatigue in POFS rats. Key words:
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Objective: To investigate the dynamical variation of the hippocampal neurotrophic factors (NTF) in elderly rats with postoperative fatigue syndrome (POFS) and the antifatigue mechanism of ginsengside Rb1. Methods: Ninety-six elderly male SD rats were randomly divided into Sham, POFS model, and ginsengoside Rb1 intervention groups, and each group was divided into subgroups by postoperative 6 h, 1, 3, and 7 d. The hippocampus was removed at each time point after open field test (OFT) to detect the mRNA expression levels of nerve growth factors (NGF) and brain-derived neurotrophic factors (BDNF) by Real-time PCR; The content of protein was detected by radioimmunoassay; The ultrastructural changes in hippocampus CA1 area were observed by electron microscopy. Results: Compared with the Sham group, the number through lattice in OFT of rats in the POFS model group declined (P < 0.01), while resting time increased (P < 0.01); The expression level of NGF and BDNF mRNA in the POFS model group declined (P < 0.05, 0.01), the expression level of corresponding protein declined (P < 0.05). Compared with the POFS model group, the number through lattice in OFT of rats in the Rb1 group increased (P < 0.05), the expression level of NGF and BDNF mRNA of rats in Rb1 group increased (P < 0.05, 0.01), and the expression level of corresponding protein also increased (P < 0.01). Electron microscopy results showed that compared with the Sham group, the ultrastructures of the hippocampal neurons of rats were significantly damaged in the POFS model group, which were relatively impromed in the Rb1 group. Conclusion: The expression level of NTF inelderly rats with POFS declines, the hippocampal neurons are damaged to a certain extent and the application of ginsenoside Rb1 may have the improvement to POFS in elderly rats.
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Objective: To investigate the central oxidative stress characteristics of rats with postoperative fatigue syndrome (POFS) and the antifatigue mechanism of ginsenosides Rb1. Methods: Rat models of POFS were established by using the 70% middle part of small bowel resection method. Ninety-six SD rats were randomly divided into control, model, and ginsenoside Rb1 (GRb1, 10 mg/kg) groups by weight. Rats in each group were administered 1 h before operation and were then divided into four subgroups at days 1, 3, 7, and 10. Morris water-maze test was done on postoperative days 2-7. Meanwhile, grasping test, malondialdehyde (MDA) content, superoxide dismutase (SOD), and glutathione peroxidase (GSH-Px) activities were detected on postperative days 1, 3, 7, and 10 and the ultrastructure of hippocampal CA1 area was observed through electron microscope. Results: Compared with the control group, the maximum grip of model rats had an obvious decline on days 3, 7, and 10 (P < 0.05). The total average escape latency was significantly extended (P < 0.05) and the platform crossing times were significantly reduced (P < 0.05). Compared with the model group, the above indexes of rats in GRb1 group were effectively improved after the intervention (P < 0.05). Compared with the control group, on postoperative days 1 and 3, the MDA content was obviously increased (P < 0.05) and SOD activity was obviously raised (P < 0.05). On postoperative day 7, GSH-Px activity was obviously raised (P < 0.05). After the intervention of GRb1, the MDA content was effectively decreased (P < 0.05), SOD and GSH-Px activities were effectively improved (P < 0.05). Electron microscope showed that the ultrastructure of hippocampal CA1 area of rats in GRb1 group was significantly improved. Conclusion: Surgical stress leads to the state change of central oxidative stress; GRb1 could reduce the damage of oxidative stress by strengthening the activity of central anti-oxidant enzymes, so as to protecte central neurons, which may be one of the mechanisms against POFS.
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Objective To explore the therapeutical effects of enteral nutrition (EN) combined with panaxoside Rb1 on mouse modles of postoperative fatigue syndrome. Methods Totally, 72 male Sprague-Dawley mice were randomly divided into control group, model group, EN group, EN associated with high/middle/low dose panaxoside Rb1 groups (EHP group, EMP group, and ELP group, n = 12 in each group). Changes in body weight were measured before and after interventions. Learning and memory playback abilities, physical strength,and vim state were evaluate by Morris Water Maze test and Improved Tail Suspension test. Serum transferrin, prealbumin, fibronectin, and interleukin-2 levels were measured with ELISA. Serum albumin level was assayed with Bromcresol Green colorimetric technique. CD4 + and CD8 + proportions were assayed by flow cytometry. Results The body weight grew alternately in each group without significant differences ( P ＞ 0.05 ) except for model group.The latency period was significantly shorter in EN combined with panaxoside Rbl group than that in model group ( P ＜ 0. 05 ) , and the frequencies of crossing platform in EHP group and EMP group were significantly higher than those in model group ( P ＜ 0. 01 ). The areas of struggling above domain in EHP group and EMP group were significantly larger than those in model group ( P ＜ 0. 05 ), and the accumulated static time of rest in EHP group, EMP group, and ELP group was significantly shorter than that in model group ( P ＜ 0.05 ). Serum transferrin, prealbumin, fibronectin levels in EN combined with panaxoside Rb1 group were significantly higher than those in model group ( all P ＜ 0.05 ). The CD4 + T proportion and interleukin-2 level in EHP group, EMP group, and ELP group were significantly higher than those in model group (both P ＜0.05 ); however, CD8 + T proportion was not significantly different between three panaxoside Rbl groups and model group (P ＞ 0. 05 ). Conclusion EN combined with panaxoside Rb1 can improve postoperative fatigue syndrome in a dose-dependent way, which may be explained by the fact that it can strengthen the postoperative nutrition, restrain hypermetabolism, and increase immunity.
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Objective To investigate the effects of rhGH on rat model of postoperative fatigue syndrome (POFS) and to study its mechanism. Methods A total of 36 SD rats were randomly divided into 3 groups. The model group and rhGH group were estalished into the model of POFS by partial resection of the liver, and administrated with the same volume of physiological saline and rhGH, and control group was without any treatment. The behavioral changes and the disorder of nutrition intake after operation, stress reaction (pathological changes of mucous membrane in small intestine) and the liver albumin expression were observed. Results The rhGH could improve behavioral changes of rat model and increase the serum levels of the iron, total protein, albumin and globulin as the index of nutrition, and restore the injury of the mucous membrane resulted from the stress reaction and increase the expression of the liver albumin. Conclusion rhGH can shorten the time of POFS and mitigate POFS of rat model.
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Objectives: To research the effects of recombinant human growth hormone(rhGH) with total parenteral nutrition(TPN) on the old patients following abdominal surgery. Methods: 26 old patients receiving TPN after major abdominal surgery were selected and distributed to study group(rhGH+TPN, n =13) and control group(TPN only, n =13).For 7 days after operation, rhGH (8 U/d) or normal saline(in control group) were used. The patients' weight, serum albumin, right hand grip, sleep time and the time of incision cicatrized were determined. Results: The increase of weight, level of plasma albumin, grip power of right hand and sleep time were improved more in study group than those in control group. The incision cicatrized time was also shortened in study group. Conclusions: Growth hormone can promote protein synthesis, accelerate incision healing and reduce the postoperative fatigue syndrome.
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Objective To establish and assess a model of abdominal postoperative fatigue syndrome (POFS) in rats. Methods After 70% hepatectomy was performed, the following observations of the animals were made:general condition, rat tail suspension test,weight carrying swim fatigue test,serum levels of albumin,ferrition,and iron,pathologic assessment of injury of small intestinal mucosa and hepatic albumin gene expression .Results After 70% hepatectomy of the rats,their general candition was poor,the level of physical tolerance decreased,they showed a certain amount of depression,and marked changes were found in nutritional index,stress injury of small intestinal mucosa and hepatic albumin gene expression.Conclusions A 70% hepatectomy rat model has the basic characteristics of clinical abdominal POFS, and can be used as an experimental animal model for the study of abdominal POFS.