Showing 11 results for Hormone
Dr Sepideh Saffarpour, Dr Arash Mehraz, Mrs Pargol Sadeghi Tehran, Dr Farinaz Nasirinezhad,
Volume 0, Issue 0 (3-2018)
Abstract
Purpose:While Genotropin, a recombinant human growth hormone (GH), may be a repositioning drug for treating neurological diseases, its effectiveness for neuropathic pain remains uncertain. The current research investigated the pain alleviating effect of Genotropin and its possible effective mechanisms.
Method: Two weeks after chronic constriction injury (CCI) of sciatic nerve, adult male rats were divided into three main experimental groups: Control, Vehicle which received normal saline, and Treatment which received Genotropin (0.3 and 0.6 mg/kg) either alone or in combination with L-arginine, L-NAME, or glutamate (n=8). Pain-related behaviors were assessed using Von Frey filaments, plantar and the Randall-Selitto tests. Blood samples were collected to evaluate relevant oxidant/antioxidant markers.
Results: GH decreased mechanical allodynia (P<0.05, F=2.7) mechanical (P<0.01, F=3.4) and thermal hyperalgesia (P<0.001, F=2.5). Also, pretreatment with 0.3 mg/kg GH abolished the nociceptive effects of L-arginine (500mg/kg) and glutamate (1000nmol) (P<0.01; F=2, F=3), while enhancing the antinociceptive effect of L-NAME (P< 0.05, F=2.8). It significantly reduced lipid peroxidation (P < 0.01, F =3.7), restored glutathione, glutathione peroxidase, and superoxide dismutase levels (P < 0.01, F =11, F = 10.52, F = 5 respectively) and increased the catalase level (P < 0.01, F =5) in plasma.
Conclusion: The current data suggests that exogenous GH, alleviates pain and enhance antioxidative factors in the peripheral neuropathic pain model. The glutamate and nitric oxide pathways are also involved in its’ antinociceptive effect. It seems that Genotropin can be effective as a repositioning drug in the treatment of neuropathic pain.
Paria Arfa-Fatollahkhani, Arezo Nahavandi, Hossein Abtahi, Shabnam Anjidani, Sahar Borhani, Seyed Behnam Jameie, Mohammad Shabani, Saeed Mehrzadi, Ali Shahbazi,
Volume 8, Issue 2 (3-2017)
Abstract
Introduction: Mood disorders such as anxiety and depression are common following menopause and andropause. The lack of sex steroid hormones is suggested as the primary cause of these disturbances. The level of luteinizing hormone (LH) would also rise 3-4 times than normal in these people. The potential effects of LH on mood and cognitive symptoms following menopause and andropause are not clear yet. This study aimed to investigate the effect of increased LH on novel object discrimination (NOD) memory and anxiety like behavior in gonadectomized rats.
Methods: Four-month-old male and female Wistar rats were randomly assigned into 4 groups (in each sex): Control rats (Cont), gonadectomized without treatment (GnX), gonadectomized treated with triptorelin (a GnRH agonist which decreases LH release) (GnX+Tr), gonadectomized treated with triptorelin plus sex steroid hormone, estradiol in female and testosterone in male rats (GnX+Tr+S/T). After 4 weeks treatment, anxiety score (elevated plus maze) and NOD were measured. Data were analyzed using 1- way ANOVA, and P values less than 0.05 were considered as significant.
Results: Gonadectomy increased anxiety like behaviors (decrease of presence time in the open arms) in female rats (P=0.012), but not in male ones (P = 0.662). Additionally, triptorelin alone reduced the increased anxiety score in gonadectomized female rats, compared to group treated with both triptorelin and estradiol. Furthermore, it was shown that gonadectomy and or treatment with triptorelin and sex steroids had no significant effect on the new object recognition memory in both female (P = 0.472) and male rats (P = 0.798).
Conclusion: On the whole, this study revealed that increased level of LH following menopause or andropause should be considered as a possible cause for increased anxiety. Also, this study showed that LH reducing agents would reduce anxiety behavior in gonadectomized female rats. The effect of increased LH on cognitive functions such as new object recognition memory was not evident in this study needs further studies and should be interpreted with caution.
Lorenzo Curtò, Salvatore Cannavò,
Volume 8, Issue 6 (11-2017)
Abstract
Recently, Basic and Clinical Neuroscience published an article by Lim et al. (2016) entitled Co-occurence of Pituitary Adenoma with Suprasellar and Olfactory Groove Meningiomas. They claimed it as the first case of co-occurence of these two malignancies. However, to our knowledge, this is not the first case reported in this regard. We reported the same case scenario in a 61-year-old woman referred to our outpatient clinic in 2007. In this commentary, we are going to discuss our reported case and present a brief review over co-occurence of intracranial meningioma with pituitary adenoma.
Hiwa Mohammadi, Mohammad Rezaei, Seyed Mojtaba Amiri, Zohreh Rahimi, Kamran Mansouri, Habibolah Khazaie,
Volume 9, Issue 6 (11-2018)
Abstract
Introduction: There are controversial reports about association between sleep and Hypothalamic-Pituitary-Adrenal (HPA) activity. Studies have reported the influence of insomnia on HPA hormones. However, they usually ignored the heterogeneity of insomnia symptoms, so subtypes of the disorder have not been considered in the reports. The present study aimed to investigate the final and intermediate products of HPA system among a group of psychophysiological and paradoxical insomniac patients in comparison to a group of normal sleepers.
Methods: We investigated the awakening serum level of Adrenocorticotropic Hormone (ACTH) and cortisol after one night Polysomnography (PSG) in 17 subjects with psychophysiological insomnia, 19 subjects with paradoxical insomnia and 17 subjects with normal sleep profile. Groups were matched for age and Body Mass Index (BMI). Serum levels of ACTH and cortisol were measured by Enzyme-Linked Immunosorbent Assay (ELISA) method.
Results: Although, a tendency toward elevation of both ACTH and cortisol was observed among patients with paradoxical insomnia compared to both control and psychophysiological insomnia, the differences were not significant comparing three groups. According to regression analysis, higher Non-Rapid Eye Movement sleep (NREM) arousal and Pulse Transit Time (PTT) significantly predicted higher level of ACTH.
Conclusion: These findings could suggest the personality traits hypothesis for paradoxical insomnia. Both cortical and subcortical arousal could lead to more HPA activity and higher ACTH level. Further studies are recommended to confirm the hypothesis.
Kobra Akhoundzadeh, Abedin Vakili, Hamid Reza Sameni,
Volume 10, Issue 1 (1-2019)
Abstract
Introduction: Based on our previous findings, the treatment of stem cells alone or in combination with thyroid hormone (T3) and mild exercise could effectively reduce the risk of stroke damage in young mice. However, it is unclear whether this treatment is effective in aged or middle-aged mice. Therefore, this study designed to assess whether combination of Bone Marrow Stromal Cells (BMSCs) with T3 and mild treadmill exercise can decrease stroke complications in middle-aged mice.
Methods: Under laser Doppler flowmetry monitoring, transient focal cerebral ischemia was produced by right Middle Cerebral Artery Occlusion (MCAO) for 45 min followed by 7 days of reperfusion in middle-aged mice. BMSCs (1×105) were injected into the right cerebral ventricle 24 h after MCAO, followed by daily injection of triiodothyronine (T3) (20 µg/100 g/d SC) and 6 days of running on a treadmill. Infarct size, neurological function, apoptotic cells and expression levels of Glial Fibrillary Acidic Protein (GFAP) were evaluated 1 week after stroke.
Results: Post-ischemic treatment with BMSCs or with T3 and or mild treadmill exercise alone or in combination did not significantly change neurological function, infarct size, and apoptotic cells 7 days after ischemia in middle-aged mice (P>0.05). However, the expression of GFAP significantly reduced after treatment with BMSCs and or T3 (P<0.01).
Conclusion: Our findings indicate that post-stroke treatment BMSCs with exercise and thyroid hormone cannot reverse neuronal damage 7 days after ischemia in middle-aged mice. These findings further support that age is an important variable in stroke treatment
Leila Derafshpour, Ehsan Saboory, Abbas Ali Vafaei, Ali Rashidy-Pour, Shiva Roshan-Milani, Yosef Rasmi, Yosef Panahi, Hamidreza Sameni,
Volume 10, Issue 2 (3-2019)
Abstract
Introduction: The long-term adverse effects of transient thyroid function abnormalities at birth on intellectual development are proven. The effect of exercise increases in the presence of sex hormones. The current study aimed at investigating the possibility that a combination of sex hormones and exercise has synergistic effects on neural plasticity in Transient Congenital Hypothyroidism (TCH) rats.
Methods: To induce hypothyroidism in the mothers, Propylthiouracil (PTU) was added to drinking water (100 mg/L) on the 6th day of gestation and continued until the 21st Postnatal Day. From Postnatal Day (PND) 28 to 47, the female and male pups received 17β-estradiol and testosterone, respectively. The mild treadmill exercise began 30 minutes after the sex hormones or vehicle administration. On PND 48, electrophysiological experiments were performed on brain slices.
Results: Increase of Long-Term Potentiation (LTP) was observed in sedentary-non-hormone female rats of TCH group, compared with that of the control. The exercise enhanced LTP in control rats, but the hormones showed no significant effect. The effect of exercise and sex hormone was not significant in the TCH group. The combination of exercise and testosterone enhanced LTP in TCH male rats, while the combination of exercise and estradiol or each of them individually did not produce such an effect on LTP in TCH female rats.
Conclusion: The study findings showed an increase in excitatory transmission despite the returning of thyroid hormone levels to normal range in TCH female rats. Also a combination treatment including exercise and testosterone enhanced LTP in male rats of TCH group, which was a gender-specific event.
Razieh Samandari, Majid Hassanpour-Ezatti, Sajad Fakhri, Fatemeh Abbaszadeh, Masoumeh Jorjani,
Volume 10, Issue 3 (5-2019)
Abstract
Introduction: Sex differences in outcomes of Spinal Cord Injury (SCI) suggest a sex-hormone-mediated effect on post-SCI pathological events, including glutamate excitotoxicity. This study aimed to investigate the importance of gonadal hormones on glutamate release subsequent to SCI in rats.
Methods: After laminectomy at T8-T9, an electrolytic lesion was applied to the spinothalamic tracts of male and female rats. Using spinal microdialysis, we assessed glutamate levels at the site of lesion in both intact and gonadectomized rats for 4 hours. In this way, we examined the sex differences in the glutamate concentrations.
Results: The peak retention time of glutamate level was 10.6 min and spinal glutamate concentration reached a maximum level 40 min following SCI. In male SCI rats, gonadectomy caused a significant elevation of glutamate level (P<0.001) following injury which was maximum 40 min post-SCI as well. However, no significant alterations were seen in gonadectomized female rats.
Conclusion: The significant differences in glutamate levels between both intact and gonadectomized SCI male and female rats show the sex-hormone-related mechanisms underlying the molecular events in the second phase of SCI. It seems that the role of male gonadal hormones to prevent glutamate excitotoxicity is more prominent. The exact mechanisms of these hormones on the functional recovery after SCI should be clarified in further studies.
Maryam Radahmadi, Mina Sadat Izadi, Atefeh Rayatpour, Maedeh Ghasemi,
Volume 12, Issue 1 (1-2021)
Abstract
Introduction: Corticotropin-Releasing Hormone (CRH) is involved in stress and energy homeostasis. On the other hand, CRH receptors also exist within the paraventricular nucleus (PVN) and Central Amygdala (CeA) nuclei. The present study compared the effect of CRH microinjections into PVN and CeA on three consecutive hours and cumulative food intake, internal regulatory factors of food intake, such as serum leptin and ghrelin, as well as blood glucose levels in rats under different acute psychological (Social Stress [SS] and Isolation Stress [IS] group) stresses.
Methods: Sixty-six male Wistar rats were randomly allocated to 11 groups: Control, Sham, CRH-PVN, CRH-CeA, SS, IS, SS-CRH-PVN, SS-CRH-CeA, IS-CRH-PVN, and IS-CRH-CeA groups. The CRH (2 µg/kg in 0.5 µL saline) was injected into PVN and CeA nuclei in rats under everyday, acute social stress and isolation stress conditions.
Results: Acute isolation and social stresses did not affect cumulative food intake. Whereas isolation stress led to changes in both leptin and glucose levels, social stress reduced only glucose levels. Cumulative food intake significantly decreased under acute CRH injection into the CeA and particularly into the PVN. Blood glucose significantly reduced in all the groups receiving CRH into their CeA.
Conclusion: The PVN played a more important role compared to CeA on food intake. These nuclei probably employ different mechanisms for their effects on food intake. Besides, it seems that exogenously CRH injection into the PVN probably had a more anorectic effect than naturally activated CRH by stresses. Acute isolation stress had a greater impact than social stress on leptin level and cumulative food intake. Thus, elevated food intake related to leptin compared to ghrelin and glucose levels in the CRH-PVN group under acute social stress.
Masoumeh Eghtesad, Mahmoud Elahdadi Salmani, Taghi Lashkarbolouki, Iran Goudarzi,
Volume 13, Issue 3 (5-2022)
Abstract
Introduction: Stress is a reaction to unwanted events disturbing body homeostasis and its pathways and target areas. Stress affects the brain through the lateral hypothalamic area (LHA), the orexinergic system that mediates the effect of corticotropin-releasing hormone (CRH) through CRH Receptor Type 1 (CRHr1). Therefore, this study explores the outcome of stress exposure on anxiety development and the involvement of the LHA through LHA-CRHr1.
Methods: Male Wistar rats (220-250 g) implanted with a cannula on either side of the LHA received acute or chronic stress. Subsequently, exploratory behavior was examined using the Open Field (OF), and anxiety was tested by Elevated Plus Maze (EPM). Before sacrifice, the cerebrospinal fluid (CSF) and the blood were sampled. Nissl stain was performed on fixed brain tissues.
Results: Acute stress reduced exploration in of and increased anxiety in EPM. LHA-CRHr1 inhibition reversed the variables to increase the exploration and decrease anxiety. In contrast, chronic stress did not show any effect on anxiety-related behaviors. Chronic stress decreased the cell population in the LHA, which was prevented by the CRHr1 inhibition. However, the CRHr1 inhibition could not reverse the chronic stress-induced increase in the CSF orexin level. Furthermore, plasma corticosterone levels increased through acute or chronic stress, impeded by the inhibition of CRHr1.
Conclusion: Our results recognize LHA-CRHr1 as a capable candidate that modulates acute stress-induced anxiety development and chronic stress-induced changes in the cellular population of the region.
Hamed Aliyari, Hedayat Sahraei, Sahar Gholabi, Mohammad Bagher Menhaj, Masoomeh Kazemi, Seyed Hossein Hosseinian,
Volume 13, Issue 4 (7-2022)
Abstract
Introduction: Living near high-voltage power lines and exposure to high-frequency electromagnetic fields (EMFs) is a potentially serious hazard to animal and human health. The present study was conducted to evaluate the effect of high-frequency EMFs from simulated high-voltage electric towers on cognitive, anatomical, and biological changes in the male macaque.
Methods: In this study, two Rhesus macaque were recruited, one experimental and one control. The experimental subject was exposed to EMFs from 3 kV/m simulated electric towers with a specific protocol and the control subject was tested without irradiation (4h per day, for 30 days). All required tests were performed before and after the intervention on experimental and control monkeys. The anatomical alternation of the prefrontal area (PFA) was measured by MRI images. All tests were performed on irradiated and control animals before and after the intervention and the results were compared between irradiated and control animals.
Results: The results of the present study indicated increased white blood cell counts after high-frequency EMFs irradiation. Also, the red blood cell counts showed a decreasing trend after irradiation. The plasma adrenaline level increased after irradiation. Besides, the blood glucose levels increased after irradiation. The PFA was different before and after the irradiation. Moreover, some behavioral disorders, such as fatigue, drowsiness, anorexia, and insomnia were observed after irradiation.
Conclusion: The results of biological tests and MRI showed an elevated risk of immunodeficiency disorders, weakness, and behavioral disorders. People who live or work near high-voltage electric towers with high-frequency EMFs are warned.
Mostafa Deldoost,
Volume 15, Issue 4 (7-2024)
Abstract
Humans are inherently complex creatures, and this issue became even more complicated when they decided to construct social relationships. Research into human behavior is an interdisciplinary and multifaceted endeavor studied by various disciplines, such as psychology, economics, sociology, anthropology, and neurosciences. Today, with the cooperation of researchers in different fields, it is possible to link the cellular dynamic of neurons to brain function and human behavior. Cognitive science and neurosciences, along with other disciplines, can enrich our knowledge about mechanisms of social influence, which may assist policymakers in influencing public behaviors toward creating a better society. This review aims to describe previous research on social influence’s behavioral, cognitive, and neural basis and provide more understanding of human behavior in society. I review and evaluate the relevant literature from multiple databases of peer-reviewed journals, books, and conferences and hand-searching reference lists of relevant studies that consider conformity from psychological, economic, neurobiological, and neurochemical aspects. This paper has been divided into four parts. First, I start by defining and describing two kinds of social influences. The second section focuses on psychological and economic evidence of social influence. It will then explore the neurobiological and neurochemical approaches to studying social influence. Finally, the conclusion summarizes and highlights three points I believe social neuroscience as an interdisciplinary and vibrant field should consider for future developments.
