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Sıçramaz H, Ayar A. Investigation of the effects of different processing methods on the selected nutritional properties of pumpkin and determining the appropriate process for pumpkin yogurt. Food Sci Nutr 2023; 11:6878-6887. [PMID: 37970424 PMCID: PMC10630843 DOI: 10.1002/fsn3.3580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 07/14/2023] [Accepted: 07/17/2023] [Indexed: 11/17/2023] Open
Abstract
The processing methods, especially cooking, can cause quality losses, particularly in the nutritional value of the fresh product. This study investigated the effects of preprocessing methods on the nutritional properties of pumpkin and the physicochemical and sensory properties of pumpkin yogurt. Two different pumpkin varieties (Cucurbita pepo and Cucurbita maxima) were subjected to three different preprocessing methods (freeze-drying, boiling, and baking). Boiling significantly increased antioxidant activity (p ≤ .05), followed by baking. C. maxima had higher TDF and TPC than C. pepo, but in both pumpkin varieties, TDF did not change with heat treatment (boiling and baking), while TPC decreased. Mineral contents remained the same or decreased with heat treatment, except for Mn and Fe. In particular, the addition of C. maxima significantly affected the color parameters (L*, a*, b*) of yogurt and improved WHC (from 68.9% to 91.6%) and hardness (from 58.0 to 193.5 g; p ≤ .05). The sensory evaluation concluded that heat-treated (boiled and baked) samples were preferred more than freeze-dried raw ones. In conclusion, the results revealed that adding boiled and baked pumpkins, especially the preference for C. maxima instead of C. pepo, improved the quality parameters of yogurt.
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Affiliation(s)
- Hatice Sıçramaz
- Department of Food Engineering, Faculty of EngineeringSakarya UniversitySakaryaTurkey
| | - Ahmet Ayar
- Department of Food Engineering, Faculty of EngineeringSakarya UniversitySakaryaTurkey
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Yazar U, Guvercin AR, Rouhikia M, Aktoklu M, Demirci MA, Erbay I, Ayar A. Cerebrolysin provides effective protection on high glucose-induced neuropathy in cultured rat dorsal root ganglion neurons. J Recept Signal Transduct Res 2023; 43:109-114. [PMID: 38079610 DOI: 10.1080/10799893.2023.2291566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 11/23/2023] [Indexed: 01/25/2024]
Abstract
Cerebrolysin, an endogenous peptide with neuroprotective and neurotrophic properties, indicated to be beneficial on diabetic neuropathy by preliminary clinical and experimental studies but without evidence on central or peripheral action. Dorsal root ganglion (DRG) neurons, based on involvement of pain sensation in both health and disease as first relay centers for transmission and processing of peripheral nociceptive sensory signals, was used to investigate possible effects of Cerebrolysin on high glucose-induced neuropathy, as model. DRG's were obtained from adult rats and the isolated neurons were seeded on E-Plate®'s equipped with gold microelectrodes, and incubated in culture media in a CO2 incubator at 37 C. DRGs were exposed to high glucose (50 mM) in the absence and presence of different concentrations of Cerebrolysin ® (2-40 mg/ml). Cell index (derived from cell viability and neurite outgrowth) was recorded with Real-Time Cell Analyzer and was used as primary outcome measure. High glucose-induced cellular neuropathy and neuroprotective effects of Cerebrolysin was evaluated from area under the curve (AUC) of cell index-time graphs. Exposure of DRG neurons to high glucose caused a rapid and persistent decrease in the mean AUC values compared to normoglycemic controls. Co-treatment with Cerebrolysin (40 mg/ml) attenuated this high glucose-induced effect in a concentration-dependent manner. In normoglycemic conditions, treatment with Cerebrolysin caused a dose-dependent increase in the mean AUC values. Cerebrolysin treatment resulted in maintenance of the functional integrity, survival, and promotion of neurite outgrowth of the cultured DRG neurons exposed to high glucose, indicating involvement of peripheral sensory neurons.
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Affiliation(s)
- Ugur Yazar
- Departments of Neurosurgery, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ali Rıza Guvercin
- Departments of Neurosurgery, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Mahindokht Rouhikia
- Departments of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Mehmet Aktoklu
- Departments of Neurosurgery, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Mehmet Ali Demirci
- Departments of Neurosurgery, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ibrahim Erbay
- Departments of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ahmet Ayar
- Departments of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
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Sıçramaz H, Ayar A. Coagulation temperature and smoking time determine product quality and shelf life of the acid-heat coagulated Circassian cheese. Food Sci Nutr 2023; 11:6164-6177. [PMID: 37823152 PMCID: PMC10563731 DOI: 10.1002/fsn3.3552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 06/12/2023] [Accepted: 06/26/2023] [Indexed: 10/13/2023] Open
Abstract
This study examined the effects of process parameters on acid-heat coagulated Circassian cheese. For this purpose, cheeses were produced at coagulation temperatures of 70°C and 90°C, and smoked for 0, 2.5, and 6 h in both summer and winter. Microbiological, textural, proteolytic, and sensorial changes were observed for 90 days at 30-day intervals. According to the results, coagulation at 90°C instead of 70°C formed a firmer structure. Six-hour smoking time instead of 2.5-h provided higher dry matter, reduced proteolysis rates, and extended the microbial shelf life. In addition, higher (6 h) smoking decelerated sourness while resulting in intense smoke flavor and higher lipolytic activity. In conclusion, seasonal changes in milk and applied the process conditions revealed significant differences in the quality parameters and shelf life of acid-heat coagulated Circassian cheese.
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Affiliation(s)
- Hatice Sıçramaz
- Faculty of Engineering, Department of Food EngineeringSakarya UniversitySakaryaTurkey
| | - Ahmet Ayar
- Faculty of Engineering, Department of Food EngineeringSakarya UniversitySakaryaTurkey
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Abstract
INTRODUCTION The aim of this study was to investigate whether Cortexin®, a brain peptide-containing agent, has any mitigating effect on high glucose-induced neuropathy, using primary cultured rat sensory neurons. MATERIALS AND METHODS Dorsal root ganglia (DRG) were excised from decapitated adult rats. Individual neurons were isolated following enzymatic and mechanical procedures. Cells were seeded on E-plate® with gold microelectrodes and maintained in conventional culture media in a CO2 incubator at 37°C. After allowing for 24 h for cell adhesion and recovery from acute enzymatic trauma, neurons were exposed to high glucose (HpG) in the absence and presence of different concentrations of Cortexin® (2-40 µg/mL). Neuroprotective effects were followed with the Real-Time Cell Analyzer® by utilizing measurement of Cell Index, a parameter representing cell viability, cell attachment, and neurite outgrowth. RESULTS Exposure of DRGs to HpG (50 mm) caused a rapid and sustained decrease in the mean area under the curve (AUC, values derived from time vs. Cell Index curve) compared to the mean AUC values in normoglycemic (NG) wells. Co-treatment with Cortexin® attenuated this HpG-induced effect, in a concentration-dependent manner (NG: 1.00 ± 0.00 vs. HG: 0.18 ± 0.02, p < 0.05; and HpG + Cortexin® [40 µg/mL]: 0.66 ± 0.17, p = 0.002 versus HpG). In normoglycemic conditions, Cortexin® treatment led to a concentration-dependent increase in the mean AUC values. CONCLUSIONS Data from this in vitro study suggest that Cortexin® has potential neuroprotective effects against chronic hyperglycemic insult in rat sensory neurons. Our results warrant further in vivo studies and may have clinical implications for diabetes-associated peripheral neuropathy.
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Affiliation(s)
- Uğur Yazar
- Department of Neurosurgery, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
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Marini P, Cowie P, Ayar A, Bewick GS, Barrow J, Pertwee RG, MacKenzie A, Tucci P. M3 Receptor Pathway Stimulates Rapid Transcription of the CB1 Receptor Activation through Calcium Signalling and the CNR1 Gene Promoter. Int J Mol Sci 2023; 24:ijms24021308. [PMID: 36674826 PMCID: PMC9867084 DOI: 10.3390/ijms24021308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 12/17/2022] [Accepted: 01/05/2023] [Indexed: 01/12/2023] Open
Abstract
In this study, we have investigated a possible mechanism that enables CB1/M3 receptor cross-talk, using SH-SY5Y cells as a model system. Our results show that M3 receptor activation initiates signaling that rapidly upregulates the CNR1 gene, resulting in a greatly potentiated CB1 receptor response to agonists. Calcium homeostasis plays an essential intermediary role in this functional CB1/M3 receptor cross-talk. We show that M3 receptor-triggered calcium release greatly increases CB1 receptor expression via both transcriptional and translational activity, by enhancing CNR1 promoter activity. The co-expression of M3 and CB1 receptors in brain areas such as the nucleus accumbens and amygdala support the hypothesis that the altered synaptic plasticity observed after exposure to cannabinoids involves cross-talk with the M3 receptor subtype. In this context, M3 receptors and their interaction with the cannabinoid system at the transcriptional level represent a potential pharmacogenomic target not only for the develop of new drugs for addressing addiction and tolerance. but also to understand the mechanisms underpinning response stratification to cannabinoids.
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Affiliation(s)
- Pietro Marini
- Institute of Education in Healthcare and Medical Sciences, Foresterhill, University of Aberdeen, Aberdeen AB25 2ZD, UK
| | - Philip Cowie
- The Institute of Medical Sciences, Foresterhill, University of Aberdeen, Aberdeen AB25 2ZD, UK
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, 61080 Trabzon, Turkey
| | - Guy S. Bewick
- The Institute of Medical Sciences, Foresterhill, University of Aberdeen, Aberdeen AB25 2ZD, UK
| | - John Barrow
- Institute of Education in Healthcare and Medical Sciences, Foresterhill, University of Aberdeen, Aberdeen AB25 2ZD, UK
| | - Roger G. Pertwee
- The Institute of Medical Sciences, Foresterhill, University of Aberdeen, Aberdeen AB25 2ZD, UK
| | - Alasdair MacKenzie
- The Institute of Medical Sciences, Foresterhill, University of Aberdeen, Aberdeen AB25 2ZD, UK
| | - Paolo Tucci
- Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy
- Correspondence:
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Bulut F, Kacar E, Bilgin B, Hekim MG, Keleştemur MM, Sahin Z, Ayar A, Ozcan M. Crosstalk between kisspeptin and gonadotropin-inhibitory hormone in the silence of puberty: preclinical evidence from a calcium signaling study. J Recept Signal Transduct Res 2022; 42:608-613. [PMID: 36137227 DOI: 10.1080/10799893.2022.2125014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Kisspeptin and gonadotropin-inhibitory hormone (GnIH) are among suggested neuroendocrine modulators of reproductive function. Intracellular calcium signaling is a critical component in the regulation of a variety of physiological and pathological processes including neurotransmitter release, and, therefore, can be used as signaling indicator for investigating the involvement of kisspeptin, GnIH, and gonadotropin-releasing hormone (GnRH) release. Hence, this study investigated the effects of kisspeptin and GnIH on calcium signaling using immortalized hypothalamic cells (rHypoE-8) as a model. Kisspeptin neurons were loaded with the ratiometric calcium dye (Fura-2 AM, 1 μmol) and intracellular free calcium ([Ca2+]i) responses were quantified using digital fluorescence imaging system. Kisspeptin-10 (100, 300, and 1000 nM) caused a significant increase in [Ca2+]i in rHypoE-8 cells (n = 58, n = 64, and n = 49, respectively, p < 0.001). The kisspeptin receptor antagonist, P234, inhibited the calcium responses to kisspeptin (p < 0.001, n = 32). GnIH (100 and 1000 nM), alone, did not cause any significant change in the mean basal [Ca2+]i levels in kisspeptin cells, but GnIH attenuated the kisspeptin-evoked [Ca2+]i transients (n = 47, p < 0.001). This novel findings of [Ca2+]i signaling in in vitro setting implicate that kisspeptin and GnIH may exert their effects on hypothalamus-pituitary-gonadal (HPG) axis by modulating kisspeptin neurons. These results also implicate that kisspeptin neurons may have an autocrine regulation.
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Affiliation(s)
- Ferah Bulut
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Emine Kacar
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Batuhan Bilgin
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
| | | | | | - Zafer Sahin
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Mete Ozcan
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
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Kulaksız Günaydı ZE, Ayar A. Phenolic compounds, amino acid profiles, and antibacterial properties of kefir prepared using freeze‐dried
Arbutus unedo
L. and
Tamarindus indica
L. fruits and sweetened with stevia, monk fruit sweetener, and aspartame. J FOOD PROCESS PRES 2022. [DOI: 10.1111/jfpp.16767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Ahmet Ayar
- Department of Food Engineering Sakarya University Sakarya Turkey
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Kurt A, Salihoglu AK, Ayar A. An in vitro Study on the Contractility of Epileptic Myometrium and Effects of Antiepileptic Agents on Oxytocin-Induced Contractions of Myometrium Isolated from Absence Epileptic WAG/Rij Rats. Neuroendocrinology 2022; 112:1078-1086. [PMID: 35168243 DOI: 10.1159/000522627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 02/14/2022] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS The aim of this study was to determine whether spontaneous and stimulated contractile activity of myometrium in epileptic rats is different from healthy ones, and whether antiepileptic drugs (AEDs) have any direct influence on myometrial contractility. METHODS Myometrial strips from nonpregnant and pregnant adult epileptic WAG/Rij and Wistar rats were suspended in organ bath containing physiological salt solution (37°C and pH 7.4, aerated with 95% oxygen-5% CO2), and isometric contractions were recorded. Effects of cumulative concentrations of selected AEDs including phenytoin, levetiracetam, and valproic acid alone and in combination on oxytocin-induced contractions was examined. Contractile parameters assessed included the area under curve, amplitude, and frequency of contractions, evaluated by 10-min periods. Data were analyzed using one-way analysis of variance and Tukey HSD test. RESULTS Spontaneous myometrial contractility and responses to oxytocin showed species difference. Compared with that of control Wistar rats, spontaneous contractions of myometrium from nonpregnant epileptic WAG/Rij rats were significantly higher while being significantly lower in pregnant preparations. Upon stimulation with oxytocin, WAG/Rij myometrium showed significantly lower contractile response compared with preparations from healthy control Wistars (p < 0.01). Phenytoin and valproate caused concentration-dependent significant attenuation (p < 0.05) of spontaneous and oxytocin-induced contractions of myometrium from WAG/Rij and Wistar rats, both nonpregnant and pregnant. CONCLUSION Myometrial smooth muscle from epileptic rats showed different spontaneous and oxytocin-induced contractility, and AEDs showed contractile modulatory actions, phenytoin being the most and levetiracetam the least effective. Although in vitro, our findings may be of clinical implications with regard to obstetric complications in epileptics and use of AEDs during pregnancy, and warrants further investigations.
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Affiliation(s)
- Aysegul Kurt
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Arif Kamil Salihoglu
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
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Sıçramaz H, Güven OT, Can A, Ayar A, Gül Y. Impact of different starter cultures and Lactobacillus helveticus on volatile components, chemical and sensory properties of pasta filata cheese. Curr Res Food Sci 2022; 5:1009-1016. [PMID: 35755305 PMCID: PMC9218132 DOI: 10.1016/j.crfs.2022.05.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 05/31/2022] [Accepted: 05/31/2022] [Indexed: 11/26/2022] Open
Abstract
L.helveticus is known to follow mainly similar metabolic pathways to contribute to cheese flavor with S. thermophilus and L. delbrueckii subsp. bulgaricus. In this study, the flavor contributions of commercial S. thermophilus starter cultures of different brands and L. helveticus adjunct culture to pasta filata type fresh Kashar cheese were investigated. L. helveticus affected the buttery aroma components of fresh Kashar cheese and resulted in low diacetyl content. In addition, acetaldehyde and other aroma components of L. helveticus added cheese was found to be higher than control and modified control cheeses. On the other hand, the modified control sample containing S. thermophilus from Danisco instead of Chr-Hansen in the control was closer to the control sample in terms of volatile profile. As the shelf-life progressed, the contribution of alcohols and hydrocarbons to volatile components decreased, while the contribution of ketones, which was the dominant group, increased in all products. When the proteolysis and lipolysis levels were examined, the control sample differed from the other two cheese samples with its high proteolysis and lipolysis rate. In summary, the rates of increase in water-soluble nitrogen and free fatty acid contents in 8 weeks of storage (from 18 to 72 days) were determined as 61% and 47%, respectively, in the control Kashar cheese, while it was 39% and 27% in the L. helveticus added sample, and 37% and 28% in the modified control sample. Finally, the sensory scores revealed that cheese flavor and texture preferences could be increased with the addition of L. helveticus. L. helveticus differed aroma profile of pasta filata type cheese - Kashar cheese. L. helveticus reduced diacetyl and increased acetaldehyde concentration. Different brands of S. thermophilus differentiated proteolysis and lipolysis levels. Different brands of S. thermophilus showed similar aroma profiles.
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Dinç G, Salihoğlu AK, Ozgoren B, Akkaya S, Ayar A. Investigation of Effects of Gadolinium-Based Contrast Agents on Uterine Contractility Using Isolated Rat Myometrium. J Magn Reson Imaging 2021; 55:1761-1770. [PMID: 34723414 DOI: 10.1002/jmri.27979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 10/20/2021] [Accepted: 10/21/2021] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND Despite concerns about safety, gadolinium-based contrast agents (GBCAs) are still used for abdominal and pelvic imaging during pregnancy. Researchers have mainly focused on teratogenicity, while very little is known about their possible direct effects on uterine contractility, yet free gadolinium potentially impacts contractility through interaction with calcium channels. PURPOSE To investigate possible effects of selected GBCAs (namely gadoteridol, gadoversetamide, gadobutrol, gadoterate meglumine, and gadoxetic acid) on the contractility of rat myometrium. STUDY TYPE In vitro organ bath study. ANIMAL MODEL Myometria were isolated from adult (10-12 weeks old) Sprague Dawley rats, both pregnant (N = 8) and nonpregnant (N = 36). FIELD STRENGTH/SEQUENCE NA. ASSESSMENT Myometrial strips were suspended in tissue bath containing physiological saline and isometric contractions were recorded. GBCAs were added to the tissue bath cumulatively, and their effects on contractility parameters (quantified by amplitude, frequency, and area under contractility curve [AUC]) were evaluated by 10-minute intervals. STATISTICAL TESTS Normality data, checked by Shapiro-Wilk test, were transformed by arcsine when needed. One- or two-way analysis of variance was performed, where appropriate, followed by Student-Newman-Keuls test. A P value of <0.05 was considered statistically significant. RESULTS All of the assayed GBCAs elicited some alterations in the myometrial contractility in a concentration-dependent manner. Gadoterate meglumine, gadoxetic acid, and gadoversetamide caused a concentration-dependent significant attenuation in AUC (oxytocin-induced, from 100% during control period to 45.1 ± 9.0% (nonpregnant) and 59.9 ± 8.5% (pregnant), for 90 μM gadoterate meglumine; respectively), and frequency of the spontaneous and oxytocin-induced contractions. Gadobutrol and gadoteridol at highest dose significantly attenuated mean AUC and frequency of oxytocin-induced contractions of nonpregnant myometrium. DATA CONCLUSION Results from this in vitro study indicate that GBCAs elicit modulation of myometrial contractions at clinically relevant concentrations. These effects may account, at least partially, for the known potential side effects (rare cases of miscarriages and elective abortion) of these agents. LEVEL OF EVIDENCE 1 TECHNICAL EFFICACY: Stage 5.
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Affiliation(s)
- Gülseren Dinç
- Department of Obstetrics and Gynecology, Karadeniz Technical University, Faculty of Medicine, Trabzon, Turkey
| | - Arif K Salihoğlu
- Department of Physiology, Karadeniz Technical University, Faculty of Medicine, Trabzon, Turkey
| | - Burak Ozgoren
- Department of Physiology, Karadeniz Technical University, Faculty of Medicine, Trabzon, Turkey
| | - Selçuk Akkaya
- Department of Radiology, Karadeniz Technical University, Faculty of Medicine, Trabzon, Turkey
| | - Ahmet Ayar
- Department of Physiology, Karadeniz Technical University, Faculty of Medicine, Trabzon, Turkey
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Kelestimur H, Bulut F, Canpolat S, Ozcan M, Ayar A. Kisspeptin leads to calcium signaling in cultured rat dorsal root ganglion neurons. Gen Physiol Biophys 2021; 40:155-160. [PMID: 33881002 DOI: 10.4149/gpb_2020047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 12/21/2020] [Indexed: 11/08/2022]
Abstract
Although kisspeptin and GPR54 have been reported to be expressed in the neurons of the dorsal root ganglion (DRG) of rats, and kisspeptin has been suggested to be involved in pain modulation in rodents, there is no study on the effects and mechanisms of kisspeptin on sensory neurons. Therefore, the aim of this study was to investigate the effects and mechanism of kisspeptin on intracellular free calcium levels in cultured rat DRG neurons. Bath application of kisspeptin-10 increased intracellular free calcium levels ([Ca2+]i). In the absence of extracellular calcium, the kisspeptin induced an attenuated but still significant increase in [Ca2+]i. [Ca2+]i responses persisted in the presence of protein kinase C (PKC) inhibitor. Data from this study revealed that kisspeptin-10 activates [Ca2+]i signaling independent of PKC in cultured rat sensory neurons suggesting that peripheral site is also involved in the pain modulating effect of kisspeptin.
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Affiliation(s)
- Haluk Kelestimur
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
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12
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Kelestimur H, Bulut F, Canpolat S, Ozcan M, Ayar A. Kisspeptin leads to calcium signaling in cultured rat dorsal root ganglion neurons. Gen Physiol Biophys 2021. [DOI: 10.4149/2020047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Karkucak M, Batmaz İ, Kerimoglu S, Ayar A. Comparison of clinical outcomes of ultrasonography-guided and blind local injections in facet syndrome: A 6-week randomized controlled trial. J Back Musculoskelet Rehabil 2020; 33:431-436. [PMID: 31524141 DOI: 10.3233/bmr-181447] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Facet syndrome is defined as pain that arises from any structure of the facet joints, including the fibrous capsule, synovial membrane, hyaline cartilage, and bone. OBJECTIVES To compare the effectiveness of US-guided and blind injections on clinical outcome in facet syndrome. MATERIALS AND METHODS Forty-seven patients with the diagnosis of facet syndrome were included. Patients were consecutively randomized into one of the two groups. The patient's history, physical examination and routine laboratory parameters were obtained and diagnose was established based on physical findings. Two injections (mixture of 2 ml of 1% lidocaine hydrochloride and 20 mg of triamcinolone, to a single or maximum two sites depending on the clinical characteristics of the facet joint) were performed with 15 days apart, as blinded or US-guided manner. Clinical outcome assessments were carried out at 0, 2nd and 6th weeks, using Visual Analog Scale (VAS), Oswestry Disability Index (ODI) and State-Trait Anxiety Inventory (STAI). RESULTS The patients' initial VAS and ODI were not significantly different. When the two groups were compared in the 6th week in terms of VAS scores, improvement was more pronounced in the US-guided injection group (US-guided group (n= 23) before 7.6 (2.2) cm, after 3.0 (1.7) cm, P= 0.0001 vs blind group (n= 24) before 7.2 (1.3) cm, after 5.2 (2.0) cm, P= 0.0001). The improvement in initial and 6th week ODI was statistically significant in the US-guided injection group (P= 0.006). Except STAI I for US-group, trait anxiety scale scores were significant in both groups. CONCLUSION The US-guided local injections offer better clinical outcome in the treatment of facet syndrome.
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Affiliation(s)
- Murat Karkucak
- Department of Physical Medicine and Rehabilitation, Medical School, Division of Rheumatology, Karadeniz Technical University, Farabi Hospital, Trabzon, Turkey
| | - İbrahim Batmaz
- Department of Physical Medicine and Rehabilitation, Medical School, Dicle University, Diyarbakır, Turkey
| | - Servet Kerimoglu
- Department Orthopaedics and Traumatology, Medical School, Karadeniz Technical University, Trabzon, Turkey
| | - Ahmet Ayar
- Department Physiology, Medical School, Karadeniz Techical University, Trabzon, Turkey
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Karkucak M, Kola M, Kalkişim A, Çapkin E, Ayar A, Türk A. Infliximab therapy provides beneficial effects for choroidal thickness increase in patients with active ankylosing spondylitis: A possible mechanism mediating the suppressing of uveitis attacks. Arch Rheumatol 2020; 36:56-62. [PMID: 34046569 PMCID: PMC8140873 DOI: 10.46497/archrheumatol.2021.7806] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 01/24/2020] [Indexed: 11/03/2022] Open
Abstract
Objectives This study aims to quantitatively assess the profile of the choroidal thickness (ChT) in patients with ankylosing spondylitis (AS) using optical coherence tomography (OCT), and to examine whether the posterior eye segment abnormalities in active AS patients are reversible by infliximab therapy. Patients and methods October 2014 and March 2016 Thirty-one patients with AS (22 males, 9 females; mean age 39.6±12.3 years; range, 22 to 68 years) and 24 healthy controls (16 males, 8 females; mean age 40.8±8.9 years; range, 35 to 61 years) were enrolled. Patients' clinical and demographic characteristics were recorded. Using OCT, we performed retinal nerve fiber layer (RNFL) thickness, ganglion cell complex, and ChT measurements in AS patients before and six months after the initiation of infliximab therapy, and in healthy controls. Results At baseline, patients with AS had higher ChT (mean±standard deviation: 347.5±114.4 μm) compared to healthy controls (322.1±62.8 μm), although this did not reach statistical significance level (p=0.283). At six months after the first measurement, the mean ChT was significantly decreased (under infliximab therapy: 326.5±99.7 μm vs. before: 347.5±114.4 μm, p=0.018) in AS group, while no significant change was observed in the control group (p=0.102). RNFL thickness in the AS group was significantly decreased after six months of treatment with infliximab (p=0.008). Conclusion By evaluating the posterior eye segment of patients with AS using OCT, this study has demonstrated that active AS patients had higher ChT. The significant reduction in this ChT after infliximab therapy may be mediating the established effective suppressing action of infliximab on uveitis attacks.
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Affiliation(s)
- Murat Karkucak
- Department of Orthopedics and Traumatology, Karadeniz Technical University Medical School, Trabzon, Turkey
| | - Mehmet Kola
- Department of Ophthalmology, Karadeniz Technical University Medical School, Trabzon, Turkey
| | - Ahmet Kalkişim
- Department of Ophthalmology, Karadeniz Technical University Medical School, Trabzon, Turkey
| | - Erhan Çapkin
- Department of Orthopedics and Traumatology, Karadeniz Technical University Medical School, Trabzon, Turkey
| | - Ahmet Ayar
- Department of Physiology, Karadeniz Technical University Medical School, Trabzon, Turkey
| | - Adem Türk
- Department of Ophthalmology, Karadeniz Technical University Medical School, Trabzon, Turkey
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Ozcan S, Bulmus O, Ulker N, Canpolat S, Etem EO, Oruc S, Yardimci A, Bulmus FG, Ayar A, Kelestimur H, Ozcan M. Agomelatine potentiates anti-nociceptive effects of morphine in a mice model for diabetic neuropathy: involvement of NMDA receptor subtype NR1 within the raphe nucleus and periaqueductal grey. Neurol Res 2020; 42:554-563. [PMID: 32336224 DOI: 10.1080/01616412.2020.1757895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
OBJECTIVES Opioid analgesics have been used for a long time in the treatment of acute and chronic pain. However, they have many side effects including tolerance development to a significant extent. Agomelatine, an atypical antidepressant, has been demonstrated to be effective in experimental studies on pain. However, the effect of agomelatine on morphine tolerance development and its mechanism of action are unknown. The antinociceptive effects of agomelatine, morphine and their combination were assessed in a mice model for painful diabetic neuropathy. The roles of glutamate ionotropic receptor N-methyl-D-aspartate (NMDA) type subunit-1 (GluN1) in raphe nucleus and periaqueductal gray (PAG) in the effect of agomelatine on neuropathic pain were also investigated in diabetic mice. METHODS Agomelatine (10 mg/kg), morphine (10 mg/kg) and agomelatine + morphine were administered intraperitoneally for 15 consecutive days (twice per day), and the analgesic responses were assessed at days 1, 3, 6, 9, 12 and 15 in healthy and diabetic mice. Real time polymerase chain reaction (RT-PCR) was used to determine the changes in GluN1 expression. RESULTS The tolerance development for morphine was evident, started at 6th day and remained thereafter, but not for agomelatine. GluN1 in raphe nucleus and PAG was upregulated in morphine treated but not in agomelatine-treated groups. DISCUSSION The combination of agomelatine with morphine alone causes outlasting analgesic effects of repeated treatment, which can be interpreted as attenuated tolerance. Moreover, we also pointed out for the first time the modulatory effects of agomelatine on GluN1 expression in raphe nucleus and PAG after chronic morphine treatment. ABBREVIATIONS Ca2+: Calcium; D2DR: Dopamine D2 receptor; GAPDH: Glyceraldehyde-3-phosphate dehydrogenase; GluN1: Glutamate ionotropic receptor N-methyl-D-aspartate type subunit-1; 5-HT: 5-hydroxytryptamine; i.p.: intraperitoneal injection; MPE: Maximal possible effect; MT: Melatonin; NMDA: N-methyl-D-aspartate; NMDAR1: NMDA receptors-1; PAG: Periaqueductal grey; PKCγ: Protein kinase C gamma; RT-PCR: Real time polymerase chain reaction; STZ: Streptozotocin.
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Affiliation(s)
- Sibel Ozcan
- Department of Anesthesiology and Reanimation, Faculty of Medicine, Firat University , Elazig, Turkey
| | - Ozgur Bulmus
- Department of Physiology, Faculty of Medicine, Firat University , Elazig, Turkey
| | - Nazife Ulker
- Department of Physiology, Faculty of Medicine, Firat University , Elazig, Turkey
| | - Sinan Canpolat
- Department of Physiology, Faculty of Medicine, Firat University , Elazig, Turkey
| | - Ebru Onalan Etem
- Department of Medical Biology, Faculty of Medicine, Firat University , Elazig, Turkey
| | - Sinem Oruc
- Department of Biophysics, Faculty of Medicine, Firat University , Elazig, Turkey
| | - Ahmet Yardimci
- Department of Physiology, Faculty of Medicine, Firat University , Elazig, Turkey
| | | | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University , Trabzon, Turkey
| | - Haluk Kelestimur
- Department of Physiology, Faculty of Medicine, Firat University , Elazig, Turkey
| | - Mete Ozcan
- Department of Biophysics, Faculty of Medicine, Firat University , Elazig, Turkey
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Serhatlioglu I, Bilgin B, Kacar E, Ozcan S, Canpolat S, Ayar A, Kelestimur H, Ozcan M. Agomelatine modulates calcium signaling through protein kinase C and phospholipase C-mediated mechanisms in rat sensory neurons. J Cell Physiol 2018; 234:10741-10746. [PMID: 30443943 DOI: 10.1002/jcp.27748] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 10/22/2018] [Indexed: 01/06/2023]
Abstract
Agomelatine, a novel antidepressant exerting its effects through melatonergic and serotonergic systems, implicated to be effective against pain including neuropathic pain but without any knowledge of mechanism of action. To explore the possible role of agomelatine on nociceptive transmission at the peripheral level, the effects of agomelatine on intracellular calcium ([Ca2+ ]i ) signaling in peripheral neurons were investigated in cultured rat dorsal root ganglion (DRG) neurons. Using the fura-2-based calcium imaging technique, the effects of agomelatine on [Ca2+ ]i and roles of the second messenger-mediated pathways were assessed. Agomelatine caused [Ca2+ ]i signaling in a dose-dependent manner when tested at 10 and 100 μM concentration. Luzindole, a selective melatonin receptor antagonist, almost completely blocked the agomelatine-induced calcium signals. The agomelatine-induced calcium transients were also nearly abolished following pretreatment with the 100 ng/ml pertussis toxin, a Gi/o protein inhibitor. The stimulatory effects of agomelatine on [Ca2+ ]i transients were significantly reduced by applications of phospholipase C (PLC) and protein kinase C (PKC) blockers, 10 μM U73122, and 10 μM chelerythrine chloride, respectively. The obtained results of agomelatine-induced [Ca2+ ]i signals indicates that peripheral mechanisms are involved in analgesic effects of agomelatine. These mechanisms seems to involve G-protein-coupled receptor activation and PLC and PKC mediated mechanisms.
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Affiliation(s)
- Ihsan Serhatlioglu
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Batuhan Bilgin
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Emine Kacar
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Sibel Ozcan
- Department of Anesthesiology and Reanimation, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Sinan Canpolat
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Haluk Kelestimur
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Mete Ozcan
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
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Ozcan M, Canpolat S, Bulmus O, Ulker N, Tektemur A, Tekin S, Ozcan S, Serhatlioglu I, Kacar E, Ayar A, Kelestimur H. Agomelatine pretreatment prevents development of hyperglycemia and hypoinsulinemia in streptozotocin-induced diabetes in mice. Fundam Clin Pharmacol 2018; 33:170-180. [PMID: 30216538 DOI: 10.1111/fcp.12413] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 08/25/2018] [Accepted: 09/10/2018] [Indexed: 01/22/2023]
Abstract
The main objective of this study was to investigate potential effectiveness of agomelatine pretreatment in the prevention of diabetes itself and encephalopathy, with a focus on brain tissue oxidative stress and inflammatory processes in streptozotocin (STZ)-induced diabetic mice. Interleukine-1β (IL-1β) and TACR1 (NK1), which is a tachykinine receptor, were used for the investigation of inflammation in the brain regions including raphe nucleus, periaqueductal gyrus (PAG), amygdala, and nucleus accumbens. The effects of agomelatine on total antioxidant capacity were also evaluated. In the in vitro part of the study, the effects of agomelatine on cell viability were investigated in dorsal root ganglion (DRG) neurons. Fasting blood glucose levels were measured 72 h after STZ injection to determine the diabetic condition. Agomelatine pretreatment prevented both hyperglycemia and hypoinsulinemia in STZ-treated mice. When STZ was injected to induce diabetes in mice, neither hyperglycemia nor hypoinsulinemia was developed in agomelatine pretreated mice and 6 weeks after development of diabetes, agomelatine treatment significantly decreased levels of IL-1β mRNA in raphe nucleus and nucleus accumbens. TACR1 mRNA levels were lower in raphe nucleus, PAG, and amygdala of agomelatine-treated diabetic mice. The increase in total antioxidant capacity after agomelatine administration may responsible for its beneficial effect in the prevention of diabetes. We showed that agomelatine reversed high glucose-induced cell viability decreases in DRG neurons. Both the antihyperglycemic and antioxidant effects of agomelatine might have contributed to the DRG neuron viability improvement. In conclusion, agomelatine seems to both prevent development of diabetes and reverse the encephalopathic changes caused by diabetes.
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Affiliation(s)
- Mete Ozcan
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Sinan Canpolat
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Ozgur Bulmus
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Nazife Ulker
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Ahmet Tektemur
- Department of Medical Biology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Suat Tekin
- Department of Physiology, Faculty of Medicine, Inonu University, Malatya, Turkey
| | - Sibel Ozcan
- Department of Anesthesiology and Reanimation, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Ihsan Serhatlioglu
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Emine Kacar
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Haluk Kelestimur
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
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Aydin HR, Turgut H, Kurt A, Sahan R, Kalkan ÖF, Eren H, Ayar A. Ivabradine inhibits carbachol-induced contractions of isolated rat urinary bladder. ADV CLIN EXP MED 2018; 27:893-897. [PMID: 29905410 DOI: 10.17219/acem/71197] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND Overactive bladder (OAB), a symptom syndrome defined as urgency, is a common clinical condition, which sometimes cannot be satisfactorily treated with current medications in every subject; therefore, alternatives are needed. OBJECTIVES The aim of this in vitro study was to investigate the effects of ivabradine, a selective pacemaker If current inhibitor, on agonist-induced isometric contractions of the bladder smooth muscles. MATERIAL AND METHODS Urinary bladder strips were isolated from adult male Wistar rats and suspended in a tissue bath containing physiological solution. The strips were contracted by bath applications of carbachol (CCh, 1 μM). Ivabradine (30 μM, 60 μM or 90 μM) was added to the tissue bath either prior to or after the application of the agonist, and the resulting contractile activity was compared to the preceding contractile activity. The amplitude and area under force-time curves (AUFC) of the isometric contractions were evaluated. RESULTS The addition of CCh caused a marked stimulation of contractile force in isolated urinary bladder strips, which was significantly inhibited by ivabradine, both in terms of peak amplitude (29% ±3%, 20% ±6% and 18% ±6% by 30 μM, 60 μM and 90 μM ivabradine, respectively) and AUFC (47% ±5.5%, 35% ±8% and 35% ±6% by 30 μM, 60 μM and 90 μM ivabradine, respectively; n = 7 for each). Pre-treatment with ivabradine (10 μM) significantly attenuated the contractile response to CCh (1 μM; mean peak amplitude from 1493 ±216 mg to 680 ±95 mg; p < 0.003; n = 7). CONCLUSIONS The results of this in vitro study demonstrated that ivabradine inhibits cholinergic agonistinduced bladder contractions, which means that in the future ivabradine may be used in OAB treatment.
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Affiliation(s)
- Hasan Riza Aydin
- Department of Urology, University of Health Sciences, Trabzon Kanuni Training and Research Hospital, Turkey
| | - Hasan Turgut
- Department of Urology, Akcaabat Hackali Baba State Hospital, Trabzon, Turkey
| | - Ayşegül Kurt
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ramazan Sahan
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ömer Faruk Kalkan
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Huseyin Eren
- Department of Urology, Faculty of Medicine, Recep Tayyip Erdogan University, Rize, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
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Serhatlioglu I, Yuksel H, Kacar E, Ozcan S, Canpolat S, Ozcan M, Ayar A, Kelestimur H. Kisspeptin increases intracellular calcium concentration by protein kinase C-mediated signaling in the primary cultured neurons from rat hippocampus. Cell Mol Biol (Noisy-le-grand) 2018; 64:56-59. [PMID: 29974847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 05/08/2018] [Accepted: 05/17/2018] [Indexed: 06/08/2023]
Abstract
In addition to the fact that kisspeptin and its receptor GPR54 are well known to be abundantly expressed in the hypothalamus with suggestive roles in the initiation of puberty and similar reproductive system properties, there is also proof showing that kisspeptin might have influences on hippocampal functions. In our previous study, it was shown that kisspeptin increased free intracellular Ca2+ values ([Ca2+]i) through protein kinase C (PKC) activation in GT1-7 cells. For this reason, we examined the influences of kisspeptin on [Ca2+]i in hippocampal neurons to determine if kisspeptin shows its effects on hippocampus through the same mechanism. Hippocampal neurons were excised from the brains of fetuses on 17th embryonic day from maternal rats. The influences of kisspeptin on [Ca2+]i in hippocampal neurons were examined through in vitro calcium imaging system. The responses of [Ca2+]i to kisspeptin were quantified by the changes in 340nm/380nm ratio. Kisspeptin-10 caused [Ca2+]i transients in hippocampal neurons. The change in [Ca2+]i by 100 nM kisspeptin was prevented by pre-treating the cells in PKC inhibitor chelerythrine chloride. According to the results, kisspeptin activates intracellular calcium signaling in hippocampal neurons via the pathway that depends on PKC. The results of this study suggest that kisspeptin may have a role in hippocampal neuron functions.
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Affiliation(s)
- Ihsan Serhatlioglu
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Hande Yuksel
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Emine Kacar
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Sibel Ozcan
- Department of Anesthesiology and Reanimation, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Sinan Canpolat
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Mete Ozcan
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Haluk Kelestimur
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
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Serhatlioglu I, Yuksel H, Kacar E, Ozcan S, Canpolat S, Ozcan M, Ayar A, Kelestimur H. Kisspeptin increases intracellular calcium concentration by protein kinase C-mediated signaling in the primary cultured neurons from rat hippocampus. Cell Mol Biol (Noisy-le-grand) 2018. [DOI: 10.14715/cmb/2018.64.7.10] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Bahadir A, Erduran E, Değer O, Birinci Y, Ayar A. Augmented mitochondrial cytochrome c oxidase activity in children with iron deficiency: a tandem between iron and copper? Arch Med Sci 2018; 14:151-156. [PMID: 29379545 PMCID: PMC5778412 DOI: 10.5114/aoms.2016.59602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 03/21/2016] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION Dyshomeostasis of essential trace elements including iron and copper plays a key role in the pathogenesis of a myriad of serious conditions including iron deficiency (ID) anemia, in which impaired cellular energy metabolism is prominent. Although experimental studies documented decreased activity of cytochrome c oxidase (CytOx) in ID, there are not enough clinical data. The present study was conducted to determine serum copper levels and activity of mitochondrial CytOx in isolated lymphocytes of patients with iron deficiency. MATERIAL AND METHODS A total of 210 cases (2-17 years) were included in this prospective study. Serum iron and copper levels were measured. According to the serum iron levels, patients were allocated to iron deficient (ID, n = 70) and iron deficiency anemia (IDA, n = 70) groups, and iron-sufficient participants were allocated to the control group (n = 70). Activity of CytOx in the circulating lymphocytes was colorimetrically measured and compared with the controls. RESULTS The CytOx activity was significantly higher in the IDA (2.9 ±1.2 mOD/min, n = 62) group compared to the control group (2.4 ±1.3 mOD/min, n = 68, p < 0.001). Interestingly, serum copper levels were significantly higher in both the ID (106.9 ±55.5 μg/dl, n = 64, p = 0.0001) and IDA (115.1 ±50.2 μg/dl, n = 59, p = 0.0001) groups than the control group (72.1 ±46.7 μg/dl, n = 69). CONCLUSIONS Higher serum copper levels in patients with IDA implicate co-operative interaction between these trace elements. The elevated CytOx activity in patients with IDA is probably secondary to the normal/elevated serum copper levels.
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Affiliation(s)
- Aysenur Bahadir
- Division of Pediatric Hematology-Oncology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Erol Erduran
- Division of Pediatric Hematology-Oncology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Orhan Değer
- Department of Biochemistry, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Yelda Birinci
- Department of Biochemistry, Sabanci University, Istanbul, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
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Tug N, Ayvaci Tasan H, Sargin MA, Dogan Taymur B, Ayar A, Kilic E, Yilmaz B. Effects of erythropoietin on spontaneous and oxytocin induced myometrial contractions in the nonpregnant rat. Eur Rev Med Pharmacol Sci 2017; 21:5028-5033. [PMID: 29228453 DOI: 10.26355/eurrev_201711_13814] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Erythropoietin (EPO) is a glycoprotein hormone that regulates erythropoiesis. EPO activity has also been detected in a variety of tissue including the nervous system, and female and male reproductive organs. It has been shown that EPO causes relaxation in vascular smooth muscle. In the present study, we have investigated effects of EPO on spontaneous and oxytocin-induced contractions of non-pregnant rat myometrium. MATERIALS AND METHODS Myometrial stripes were obtained from adult Wistar rats at the oestrous stage. The samples were placed in an isolated organ chamber under physiological conditions and 1 g passive tension. Epoetin beta (rEPO) was added cumulatively at 0.1, 1 and 10 IU/ml concentrations to the myometrial samples showing regular spontaneous contractions for periods of 30 min. Frequency and amplitude of contractions were electrophysiologically recorded and analyzed by using a BIOPAC data acquisition system. RESULTS rEPO inhibited both area under curve and frequency of spontaneous contractions (ANOVA, n1, 2 = 9, f1 = 20.938, f2 = 20.492, p1,2 = 0.000). The inhibitory effect was insignificant at 0.1 mIU/ml rEPO level (Tukey HSD, p1 = 0.051, p2 = 0.581). In the oxytocin treated myometrial samples, a single dose of 1 IU/ml rEPO was studied. The area under curve and frequency values of these samples were inhibited by rEPO (Student's t-test, n = 9, t1 = 4.776, p1 = 0.000; t2 = 2.835, p2 = 0.012, respectively). CONCLUSIONS rEPO inhibited spontaneous and oxytocin-induced rat myometrial contractions at 1 and 10 IU/ml concentrations. It appeared that the effect was dose-dependent.
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Affiliation(s)
- N Tug
- Obstetrics and Gynecology Department, Fatih Sultan Mehmet Research Hospital, Istanbul, Turkey.
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Velioglu SK, Gedikli O, Yıldırım M, Ayar A. Epilepsy may cause increased pain sensitivity: Evidence from absence epileptic WAG/Rij rats. Epilepsy Behav 2017; 75:146-150. [PMID: 28866333 DOI: 10.1016/j.yebeh.2017.07.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 07/05/2017] [Accepted: 07/05/2017] [Indexed: 02/06/2023]
Abstract
OBJECTIVE The comorbidity of epilepsy and pain disorders as well as effectiveness of certain therapeutic approaches in both conditions attracted attention to epilepsy-pain interactions. This lead to the discovery of significantly shared pathophysiological mechanisms although many aspects remain largely unknown. To test the hypothesis that epilepsy may be associated with altered pain sensitivity, we analyzed interictal pain sensitivity using epilepsy prone WAG/Rij rats, a genetic model exhibiting age-related-onset absence epilepsy. METHODS Two series of experiments were conducted. In experiment I, pain sensitivity of symptomatic WAG/Rij rats were compared with age-matched control Wistar rats. In experiment II, pain sensitivity of WAG/Rij rats were monitored longitudinally when they were presymptomatic (at 2months) and symptomatic (after maturation, at 8months), and compared with age-matched control Wistar rats. Pain sensitivity was assessed by applying heat stimuli to hind paws and measuring the paw-withdrawal latency using thermal plantar analgesia meter in awake and freely moving animals. All pain measurements were made during the interictal period, confirmed by simultaneous electroencephalography through intracranially implanted electrodes. RESULTS In experiment I, the interictal pain withdrawal latency of symptomatic WAG/Rij rats was significantly shorter than control Wistar rats (P<0.01). In experiment II, WAG/Rij rats had significantly shorter latency of withdrawal response than control Wistar rats, both at presymptomatic (P<0.05) and symptomatic stage (P<0.0001). Matured (8months old) control Wistar rats demonstrated significantly increased withdrawal latency compared to the 2months animals (P<0.01), but the WAG/Rij rats did not (P>0.5). CONCLUSION Epileptic WAG/Rij rats present significantly increased pain sensitivity when compared to control Wistar rats, suggesting comorbidity of epilepsy and pain.
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Affiliation(s)
- Sibel K Velioglu
- Karadeniz Technical University, Faculty of Medicine, Neurology Department, Clinical Neurophysiology Unit, Trabzon, Turkey.
| | - Oznur Gedikli
- Karadeniz Technical University, Faculty of Medicine, Physiology Department, Trabzon, Turkey
| | - Mehmet Yıldırım
- University of Health Sciences, Faculty of Medicine, Medical Physiology Department, Istanbul, Turkey
| | - Ahmet Ayar
- Karadeniz Technical University, Faculty of Medicine, Physiology Department, Trabzon, Turkey
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Algul S, Ugur FA, Ayar A, Ozcelik O. Comparative determination of ventilatory efficiency from constant load and incremental exercise testing. ACTA ACUST UNITED AC 2017; 63:26-30. [PMID: 28838335 DOI: 10.14715/cmb/2017.63.7.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 05/08/2017] [Accepted: 05/15/2017] [Indexed: 11/18/2022]
Abstract
The analysis of the relationships between minute ventilation (VE) to CO2 output (VCO2), referred to as ventilatory efficiency, in response to incremental exercise testing, is considered a useful index for assessing the presence and severity of cardiopulmonary and metabolic diseases. The effects of constant load exercise testing performed at work intensity associated with anaerobic threshold (AT) and respiratory compensation points (RCP), on the accurate measurements of ventilatory efficiency are not well known. The aim of this present study was to investigate the reliability of the VE/VCO2 ratio obtained from constant load exercise tests performed with two important metabolic rates (at the AT and RCP) and compare it to that of those of incremental exercise tests. A total of 20 young male (20.8±0.4 yr) subjects initially performed an incremental exercise test and then two constant load exercise tests, on different days. Respiratory and pulmonary gas exchange variables were used to estimate AT and RCP. A paired t-test was used to analyse data. AT and RCP (average) occurred the at 60% and at 71% of peak O2 uptake, respectively. The lowest VE/VCO2 ratio recorded within the first 2 minutes of constant load exercise tests with a work load of AT (26.4±0.3) and RCP (26.7±0.5) was not statistically different from the lowest ratio obtained from the incremental exercise tests (26.0±0.7). In the constant load exercise test, despite the different metabolic rates, the increase in ventilation corresponded closely with the increase in CO2 production, reflecting an optimal ventilation and perfusion ratio. Clinicians should consider the constant load exercise test work load associated with AT and RCP as it provides a meaningful lowest value for ventilatory efficiency.
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Affiliation(s)
- S Algul
- Faculty of Medicine, Department of Physiology, Yuzuncu Yil University, Van, Turkey
| | - F A Ugur
- Faculty of Medicine, Department of Physiology, Firat University, Elazig, Turkey
| | - A Ayar
- Faculty of Medicine, Department of Physiology, Karadeniz Technical University, Trabzon, Turkey
| | - O Ozcelik
- Faculty of Medicine, Department of Physiology, Firat University, Elazig, Turkey
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Er K, Ayar A, Kalkan OF, Canpolat S, Tasdemir T, Ozan U. Neurotoxicity evaluation of three root canal sealers on cultured rat trigeminal ganglion neurons. J Clin Exp Dent 2017; 9:e34-e39. [PMID: 28149460 PMCID: PMC5268118 DOI: 10.4317/jced.52901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Accepted: 05/22/2016] [Indexed: 11/08/2022] Open
Abstract
Background The aim of this study was to investigate the possible neurotoxic effects of 3 root canal sealers (RCSs) (AH Plus, GuttaFlow, iRoot SP) on cultured rat trigeminal ganglion (TG) neurons. Material and Methods Primary cultures of TG neurons were obtained from 1 to 2-day old rats. Freshly mixed RCSs were incubated in sterile phosphate buffered saline and cells were incubated with supernatants of the RCSs for different time intervals (1-, 3-, 6- and 24-h; 1 or 1/10 diluted) and viability/cytotoxicity was tested by counting the number of live cells. Pair of dishes with cells from the same culture incubated with only culture medium was considered as negative controls. Cell images were captured and acquired at x200 magnification using a microscope equipped with a camera using special image program. The viable cells were manually counted assigned from the images for each dose and incubation duration. Data was analysed by using 1-way analysis of variance with Tukey post hoc tests. Results There was no significant change in cell viability after short duration of incubation (1- and 3-h) with the supernatant of any of RCSs, except for undiluted-AH Plus at 3-h. When AH Plus was compared with other RCSs, for diluted supernatants, there was only significant difference between iRoot SP and AH Plus at 24-h (P<0.05). Whereas undiluted-AH Plus was significantly more cytotoxic for 3-, 6- and 24-h periods as compared to respective incubation periods of undiluted other groups (P<0.05). GuttaFlow groups had similar neurotoxic effect on cells for all test periods. Conclusions All tested RCSs exhibited a variable degree of neurotoxicity on these primary sensory neurons of orofacial tissues, depending on their chemical compositions. GuttaFlow and iRoot SP evoked a less toxic response to TG cells than AH Plus. Key words:Neurotoxicity, trigeminal ganglia, cell culture, root canal sealer, AH Plus, GuttaFlow, iRoot SP.
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Affiliation(s)
- Kursat Er
- DDS, PhD, Professor, Department of Endodontics, Faculty of Dentistry, Akdeniz University, Antalya, Turkey
| | - Ahmet Ayar
- MDS, Professor, Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Omer-Faruk Kalkan
- Research Assistant, Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Sinan Canpolat
- MDS, Associate Professor, Department of Physiology, Faculty of Medicine, Firat University, Elazığ, Turkey
| | - Tamer Tasdemir
- DDS, PhD, Professor, Department of Endodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey
| | - Ulku Ozan
- DDS, PhD, Assistant Professor, Department of Endodontics, Faculty of Dentistry, Abant İzzet Baysal University, Bolu, Turkey
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Ayar A, Siçramaz H, Öztürk S, Öztürk Yilmaz S. Probiotic properties of ice creams produced with dietary fibres from by-products of the food industry. INT J DAIRY TECHNOL 2017. [DOI: 10.1111/1471-0307.12387] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Ahmet Ayar
- Sakarya Universitesi; Esentepe Kampüsü; M1 Blok Kat 2; Serdivan / Sakarya TURKIYE
| | - Hatice Siçramaz
- Sakarya Universitesi; Esentepe Kampüsü; M1 Blok Kat 2; Serdivan / Sakarya TURKIYE
| | - Serpil Öztürk
- Sakarya Universitesi; Esentepe Kampüsü; M1 Blok Kat 2; Serdivan / Sakarya TURKIYE
| | - Suzan Öztürk Yilmaz
- Sakarya Universitesi; Esentepe Kampüsü; M1 Blok Kat 2; Serdivan / Sakarya TURKIYE
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Kan E, Alici Ö, Kan EK, Ayar A. Effects of alpha-lipoic acid on retinal ganglion cells, retinal thicknesses, and VEGF production in an experimental model of diabetes. Int Ophthalmol 2016; 37:1269-1278. [PMID: 27848046 DOI: 10.1007/s10792-016-0396-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 11/06/2016] [Indexed: 11/24/2022]
Abstract
PURPOSE The purpose of the present study was to investigate the effect of alpha-lipoic acid (ALA) on the thicknesses of various retinal layers and on the numbers of retinal ganglion cells and vascular endothelial growth factor levels in experimental diabetic mouse retinas. METHODS Twenty-one male BALB/C mice were made diabetic by the intraperitoneal administration of streptozotocin (200 mg/kg). One week after the induction of diabetes, the mice were divided randomly into three groups: control group (non-diabetic mice treated with alpha-lipoic acid, n = 7), diabetic group (diabetic mice without treatment, n = 7), and alpha-lipoic acid treatment group (diabetic mice with alpha-lipoic acid treatment, n = 7). At the end of the 8th week, the thicknesses of the inner nuclear layer (INL), outer nuclear layer (ONL), and full-length retina were measured; also retinal ganglion cells and VEGF expressions were counted on the histological sections of the mouse retinas and compared with each other. RESULTS The thicknesses of the full-length retina, ONL, and INL were significantly reduced in the diabetic group compared to the control and ALA treatment groups (p = 0.001), whereas the thicknesses of these layers did not show a significant difference between ALA treatment and control groups. The number of ganglion cells in the diabetic group was significantly lower than those in the control and ALA treatment groups (p = 0.001). The VEGF expression was significantly higher in the diabetic group and mostly observed in the ganglion cell and inner nuclear layers compared to the control and ALA treatment groups (p = 0.001). Therefore, the number of ganglion cells and VEGF levels did not show significant differences between the ALA treatment and control groups (p = 0.7). CONCLUSIONS Our results show that alpha-lipoic acid treatment may have an impact on reducing VEGF levels, protecting ganglion cells, and preserving the thicknesses of the inner and outer layers in diabetic mouse retinas.
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Affiliation(s)
- Emrah Kan
- Department of Ophthalmology, Samsun Training and Research Hospital, 55100, Samsun, Turkey.
| | - Ömer Alici
- Department of Pathology, Samsun Training and Research Hospital, 55100, Samsun, Turkey
| | - Elif Kılıç Kan
- Department of Endocrinology and Metabolism, Samsun Training and Research Hospital, 55100, Samsun, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
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Karkucak M, Kalkısım A, Kola M, Capkın E, Türk A, Ayar A. SAT0408 Anti Tnf-α Therapy Provides Beneficial Effects on Choroidal Thickness Increase in Patients with Active Ankylosing Spondylitis: A Possible Mechanism of Infliximab Effectiveness in Suppressing Uveitis Attacks. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2625] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Karkucak M, Batmaz I, Kerimoglu S, Ayar A. SAT0524 Comparison of Ultrasonography-Guided Injection with Blind Injection in Facet Syndrome; A 6-Week Randomized Controlled Trial. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Canpolat S, Ozcan M, Saral S, Kalkan OF, Ayar A. Effects of apelin-13 in mice model of experimental pain and peripheral nociceptive signaling in rat sensory neurons. J Recept Signal Transduct Res 2015; 36:243-7. [DOI: 10.3109/10799893.2015.1080274] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ayar A, Ozcan M, Kuzgun KT, Kalkan OF. Spinorphin inhibits membrane depolarization- and capsaicin-induced intracellular calcium signals in rat primary nociceptive dorsal root ganglion neurons in culture. J Recept Signal Transduct Res 2015; 35:550-8. [PMID: 26053512 DOI: 10.3109/10799893.2015.1024850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Spinorphin is a potential endogenous antinociceptive agent although the mechanism(s) of its analgesic effect remain unknown. We conducted this study to investigate, by considering intracellular calcium concentrations as a key signal for nociceptive transmission, the effects of spinorphin on cytoplasmic Ca(2+) ([Ca(2+)]i) transients, evoked by high-K(+) (30 mM) depolariasation or capsaicin, and to determine whether there were any differences in the effects of spinorphin among subpopulation of cultured rat dorsal root ganglion (DRG) neurons. METHODS DRG neurons were cultured on glass coverslips following enzymatic digestion and mechanical agitation, and loaded with the calcium sensitive dye fura-2 AM (1 µM). Intracellular calcium responses in individual DRG neurons were quantified using standard fura-2 based ratiometric calcium imaging technique. All data were analyzed by using unpaired t test, p < 0.05 defining statistical significance. RESULTS Here we found that spinorphin inhibited cytoplasmic Ca(2+) ([Ca(2+)]i) transients, evoked by depolarization and capsaicin selectively in medium and small cultured rat DRG neurons. Spinorphin (10-300 µM) inhibited the Ca(2+) signals in concentration dependant manner in small- and medium diameter DRG neurons. Capsaicin produced [Ca(2+)]i responses only in small- and medium-sized DRG neurons, and pre-treatment with spinorphin significantly attenuated these [Ca(2+)]i responses. CONCLUSION Results from this study indicates that spinorphin significantly inhibits [Ca(2+)]i signaling, which are key for the modulation of cell membrane excitability and neurotransmitter release, preferably in nociceptive subtypes of this primary sensory neurons suggesting that peripheral site is involved in the pain modulating effect of this endogenous agent.
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Affiliation(s)
- Ahmet Ayar
- a Department of Physiology, Faculty of Medicine , Karadeniz Technical University , Trabzon , Turkey and
| | - Mete Ozcan
- b Department of Biophysics, Faculty of Medicine , Firat University , Elazığ , Turkey
| | - Kemal Tuğrul Kuzgun
- b Department of Biophysics, Faculty of Medicine , Firat University , Elazığ , Turkey
| | - Omer Faruk Kalkan
- a Department of Physiology, Faculty of Medicine , Karadeniz Technical University , Trabzon , Turkey and
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Kola M, Kalkisim A, Karkucak M, Turk A, Capkin E, Can I, Serdar OF, Mollamehmetoglu S, Ayar A. Regarding Comments by Yolcu et al. on "Evaluation of Choroidal Thickness in Ankylosing Spondylitis Using Optical Coherence Tomography". Ocul Immunol Inflamm 2015; 23:465-6. [PMID: 25760919 DOI: 10.3109/09273948.2014.999379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Mehmet Kola
- a Department of Ophthalmology , Karadeniz Technical University, Faculty of Medicine , Trabzon , Turkey
| | - Ahmet Kalkisim
- a Department of Ophthalmology , Karadeniz Technical University, Faculty of Medicine , Trabzon , Turkey
| | - Murat Karkucak
- b Department of Physical Medicine and Rehabilitation , Karadeniz Technical University, Faculty of Medicine, Division of Rheumatology , Trabzon , Turkey , and
| | - Adem Turk
- a Department of Ophthalmology , Karadeniz Technical University, Faculty of Medicine , Trabzon , Turkey
| | - Erhan Capkin
- b Department of Physical Medicine and Rehabilitation , Karadeniz Technical University, Faculty of Medicine, Division of Rheumatology , Trabzon , Turkey , and
| | - Ipek Can
- b Department of Physical Medicine and Rehabilitation , Karadeniz Technical University, Faculty of Medicine, Division of Rheumatology , Trabzon , Turkey , and
| | - Omer Faruk Serdar
- b Department of Physical Medicine and Rehabilitation , Karadeniz Technical University, Faculty of Medicine, Division of Rheumatology , Trabzon , Turkey , and
| | - Suleyman Mollamehmetoglu
- a Department of Ophthalmology , Karadeniz Technical University, Faculty of Medicine , Trabzon , Turkey
| | - Ahmet Ayar
- c Department of Physiology , Karadeniz Technical University, Faculty of Medicine , Trabzon , Turkey
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Ozcan M, Saatci T, Ayar A, Canpolat S, Kelestimur H. Leptin activates cytosolic calcium responses through protein kinase-C dependent mechanism in immortalized RFamide-related peptide-3 neurons. Brain Res 2015; 1601:8-14. [DOI: 10.1016/j.brainres.2014.12.053] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Revised: 12/20/2014] [Accepted: 12/29/2014] [Indexed: 10/24/2022]
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Ayar A. Kinetics of Diffusion-Controlled Adsorption of Adenine and Adenosine in a Carboxymethyl Diaminoethane Pvc-Mediated Column System. Progress in Reaction Kinetics and Mechanism 2015. [DOI: 10.3184/146867815x14199388748264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The adsorption kinetics of adenine and adenosine on a ligand-exchange matrix, carboxymethyl diaminoethane poly(vinyl chloride) in cobalt form (cobalt-CMEDA-PVC), have been studied in a fixed-bed column system. The initial ligand concentrations ranged between 1.25×10−5 and 2.0×10−4 mol L−1. The kinetic studies were carried out spectrophotometrically, in order to determine the ratecontrolling step of the adsorption. The kinetic data of the single-component systems were acquired from the breakthrough curves of the ligands on the basis of the equivalent points method. In this study, the homogeneous diffusion model was adapted to a fixed-bed column system to describe the differentiation in the ligand concentration of the effluent, beginning from breakthrough point as a function of time. The results obtained for the adsorption kinetics indicated that the diffusion step plays a significant role in the adsorption kinetics of the ligands, due to the fact that the adsorption performance was strongly affected by the initial concentration of ligands.
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Affiliation(s)
- Ahmet Ayar
- Department of Chemistry, Faculty of Sciences and Arts, University of Niğrde, Niğrde, Turkey
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Burma O, Ozcan M, Kacar E, Uysal A, Şahna E, Ayar A. In vitro effects of sodium nitroprusside and leptin on norepinephrine-induced vasoconstriction in human internal mammary artery. Cardiovasc J Afr 2014; 26:4-7. [PMID: 25787668 PMCID: PMC4814762 DOI: 10.5830/cvja-2014-041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Accepted: 07/14/2014] [Indexed: 11/06/2022] Open
Abstract
Aim The biological and pharmacological properties of vessels used in coronary artery bypass graft (CABG) surgery are as important as their mechanical properties. The aim of this study was to investigate the possible role of protein kinase C (PKC)-dependent mechanisms in leptin-induced relaxation in the human internal mammary artery (IMA). Methods IMA rings, obtained from patients undergoing CABG surgery, were suspended in isolated tissue baths containing Krebs-Henseleit solution, which were continuously gassed with 95% O2 and 5% CO2 at 37°C. Results The IMA rings were pre-contracted with increasing concentrations of norepinephrine (NE 10-9–10-4 mol/l) and the relaxation responses to sodium nitroprusside (SNP), a nitrosovasodilator, and leptin were studied in the presence and absence of a PKC inhibitor. Leptin (1 μM) caused a dose-dependent relaxation in NE pre-contracted IMA rings. Pre-treatment with a PKC inhibitor significantly attenuated this vasorelaxatory response to leptin in human isolated IMA. Conclusion It was found that SNP and leptin caused significant relaxation of the NE pre-contracted human IMA rings, and PKC was probably the sub-cellular mediator for this effect. Our findings may have clinical or pharmacological importance as it could be hypothesised that obese subjects who have a left IMA bypass graft would have better myocardial perfusion.
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Affiliation(s)
- Oktay Burma
- Department of Cardiovascular Surgery, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Mete Ozcan
- Department of Biophysics, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Emine Kacar
- Department of Physiology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Ayhan Uysal
- Department of Cardiovascular Surgery, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Engin Şahna
- Department of Pharmacology, Faculty of Medicine, Firat University, Elazig, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
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Kan E, Kiliçkan E, Ayar A, Çolak R. Effects of two antioxidants; α-lipoic acid and fisetin against diabetic cataract in mice. Int Ophthalmol 2014; 35:115-20. [PMID: 25488016 DOI: 10.1007/s10792-014-0029-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 12/01/2014] [Indexed: 10/24/2022]
Abstract
The purpose of this study was to determine whether α-lipoic acid and fisetin have protective effects against cataract in a streptozotocin-induced experimental cataract model. Twenty-eight male BALB/C mice were made diabetic by the intraperitoneal administration of streptozotocin (200 mg/kg). Three weeks after induction of diabetes, mice were divided randomly into 4 groups in which each group contained 7 mice; fisetin-treated group (group 1), α-lipoic acid-treated group (group 2), fisetin placebo group (group 3), α-lipoic acid placebo group (group 4). Fisetin and α-lipoic acid were administered intraperitoneally weekly for 5 weeks. Cataract development was assessed at the end of 8 weeks by slit lamp examination, and cataract formation was graded using a scale. All groups developed at least grade 1 cataract formation. In the fisetin-treated group, the cataract stages were significantly lower than in the placebo group (p = 0.02). In the α-lipoic acid-treated group, the cataract stages were lower than in the placebo group but it did not reach to a significant value. Both fisetin and α-lipoic acid had a protective effect on cataract development in a streptozotocin-induced experimental cataract model. The protective effect of fisetin appears as though more effective than α-lipoic acid.
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Affiliation(s)
- Emrah Kan
- Department of Ophthalmology, Samsun Training and Research Hospital, Samsun, Turkey.
| | - Elif Kiliçkan
- Department of Endocrinology and Metabolism, Samsun Training and Research Hospital, Samsun, Turkey
| | - Ahmet Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ramis Çolak
- Department of Endocrinology and Metabolism, Faculty of Medicine, Ondokuz Mayıs University, Samsun, Turkey
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Altunayoglu Cakmak V, Gazioglu S, Can Usta N, Ozkorumak E, Ayar A, Topbas M, Boz C. Evaluation of temperament and character features as risk factors for depressive symptoms in patients with restless legs syndrome. J Clin Neurol 2014; 10:320-7. [PMID: 25324881 PMCID: PMC4198713 DOI: 10.3988/jcn.2014.10.4.320] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 05/10/2014] [Accepted: 05/13/2014] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND AND PURPOSE Restless legs syndrome (RLS) is a common sleep-related movement disorder that is frequently associated with psychological disturbances. Personality traits are of considerable importance with respect to coping with chronic illness and disease vulnerability. This study assessed the temperament and character traits of RLS patients using an approach that involves the psychobiological model of personality. METHODS The personality features of 65 newly diagnosed and untreated RLS patients with no neurological or psychiatric diseases and 109 healthy controls were determined using the Temperament and Character Inventory and compared using covariance analyses. The International RLS Study Group Severity Scale was used to assess the severity of the RLS symptoms, and the Beck Depression Inventory was used to assess the presence and severity of depressive symptoms. RESULTS RLS patients scored significantly higher than healthy controls on the temperament dimension of harm avoidance (HA, p=0.02) and significantly lower on self-directedness (SD, p=0.001). No significant difference was observed in terms of the temperament dimension of novelty seeking (p=0.435). HA scores were significantly correlated with the BDI score but not with the RLS severity or duration. CONCLUSIONS High HA and low SD scores are the main characterizing personality features of RLS patients. These personality dimensions may be among the factors predisposing patients to development of the depressive symptoms that are frequently associated with RLS.
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Affiliation(s)
| | - Sibel Gazioglu
- Department of Neurology, Karadeniz Technical University Medical Faculty, Trabzon, Turkey
| | - Nuray Can Usta
- Department of Neurology, Karadeniz Technical University Medical Faculty, Trabzon, Turkey
| | - Evrim Ozkorumak
- Department of Psychiatry, Karadeniz Technical University Medical Faculty, Trabzon, Turkey
| | - Ahmet Ayar
- Department of Physiology, Karadeniz Technical University Medical Faculty, Trabzon, Turkey
| | - Murat Topbas
- Department of Public Health, Karadeniz Technical University Medical Faculty, Trabzon, Turkey
| | - Cavit Boz
- Department of Neurology, Karadeniz Technical University Medical Faculty, Trabzon, Turkey
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Kola M, Kalkisim A, Karkucak M, Turk A, Capkin E, Can I, Serdar OF, Mollamehmetoglu S, Ayar A. Evaluation of choroidal thickness in ankylosing spondylitis using optical coherence tomography. Ocul Immunol Inflamm 2014; 22:434-8. [PMID: 24988331 DOI: 10.3109/09273948.2014.928734] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
UNLABELLED Abstract Purpose: To investigate posterior segment (PS) findings in the eye in patients with ankylosing spondylitis (AS). METHODS Eighty-four patients with AS and 63 healthy controls were enrolled. PS evaluations were performed using optical coherence tomography (OCT). Foveal thickness, peripapillary retinal nerve fiber layer thickness, macular volume, ganglion cell complex, and choroidal thickness (CT) values were compared between the groups. RESULTS Mean CT was higher in patients with AS (326.5 ± 71.5 µm) than in the healthy controls (286.2 ± 59.5 µm) (p = 0.001). There was no significant difference between patients with AS and the healthy control group in terms of other OCT parameters. There was also no significant correlation between CT, AS activity index, and disease duration. CONCLUSIONS This is the first study to evaluate effects of AS on CT. CT was high in patients with AS compared to healthy controls.
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Affiliation(s)
- Mehmet Kola
- Department of Ophthalmology, Faculty of Medicine, Karadeniz Technical University , Trabzon , Turkey
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çapkin E, Karkucak M, Kırıs A, Şahin M, Kucukali turkyılmaz A, Karaca A, Gökmen F, Ayar A. FRI0428 Anti –tnf-a therapy and arterial stiffness in anklosing spondylitis; results with long-term 2 year- follow-up. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.1555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Gunduz A, Eraydin I, Turkmen S, Kalkan OF, Turedi S, Eryigit U, Ayar A. Analgesic effects of mad honey (grayanotoxin) in mice models of acute pain and painful diabetic neuropathy. Hum Exp Toxicol 2013; 33:130-5. [DOI: 10.1177/0960327113482693] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Objectives: The aim of this experimental study was to investigate the effects of mad honey (grayanotoxin, GTX), used in complementary medicine for a variety of purposes besides being food, on pain thresholds in normal mice as model for acute pain and diabetic mouse as model for neuropathic pain. Methods: Hind paw withdrawal pain threshold to thermal stimulus was measured with a plantar analgesia meter in a mice model using healthy intact animals for acute pain and streptozotocin-induced diabetic animals for chronic neuropathic pain. Time and dose-dependent effects of intraperitoneally (i.p.) administered GTX were investigated in both acute and neuropathic pain. Results: In the acute pain model, administration of GTX caused a dose- and time-dependent marked increase in the pain latency values. In diabetic mice, which had markedly increased threshold to pain, GTX (0.1 mg/kg, i.p.) restored the mean pain latencies by decreasing from the pre-GTX treatment values of 3.2 ± 0.6 to 3.0 ± 0.9s at 10 min, 3.2 ± 0.6s at 20 min, 3.4 ± 0.6s at 30 min, 2.6 ± 0.5s at 60 min and 2.4 ± 0.6s ( p < 0.05) at 100 min. Conclusion: The results from this experimental study indicate that GTX exhibits significant analgesic activity and has potential benefits against painful diabetic neuropathy. This is compatible with the widespread use of GTX containing mad honey for alleviating pain. Further studies involving long-term applications are needed for a more decisive conclusion regarding the usefulness of GTX as an analgesic, especially in the treatment of painful neuropathy.
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Affiliation(s)
- A Gunduz
- Department of Emergency Medicine, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - I Eraydin
- Department of Emergency Medicine, Trabzon Teaching and Research Hospital, Trabzon, Turkey
| | - S Turkmen
- Department of Emergency Medicine, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - O F Kalkan
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - S Turedi
- Department of Emergency Medicine, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - U Eryigit
- Department of Emergency Medicine, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - A Ayar
- Department of Physiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
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Gunduz A, Kalkan A, Turedi S, Durmus I, Turkmen S, Ayaz FA, Ayar A. Pseudocholinesterase Levels Are Not Decreased in Grayanotoxin (Mad Honey) Poisoning in Most Patients. J Emerg Med 2012; 43:1008-13. [PMID: 22525697 DOI: 10.1016/j.jemermed.2011.08.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Revised: 06/03/2011] [Accepted: 08/28/2011] [Indexed: 10/28/2022]
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Leclercq J, Martin F, Sanier C, Clément-Vidal A, Fabre D, Oliver G, Lardet L, Ayar A, Peyramard M, Montoro P. Over-expression of a cytosolic isoform of the HbCuZnSOD gene in Hevea brasiliensis changes its response to a water deficit. Plant Mol Biol 2012; 80:255-272. [PMID: 22814939 DOI: 10.1007/s11103-012-9942-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Accepted: 07/09/2012] [Indexed: 06/01/2023]
Abstract
Hevea brasiliensis is the main commercial source of natural rubber. Reactive oxygen species (ROS) scavenging systems are involved in various biotic and abiotic stresses. Genetic engineering was undertaken to study the strengthening of plant defences by antioxidants. To that end, Hevea transgenic plant lines over-expressing a Hevea brasiliensis cytosolic HbCuZnSOD gene were successfully established and regenerated. Over-expression of the HbCuZnSOD gene was not clearly related to an increase in SOD activity in plant leaves. The impact of HbCuZnSOD gene over-expression in somatic embryogenesis and in plant development are presented and discussed. The water deficit tolerance of two HbCuZnSOD over-expressing lines was evaluated. The physiological parameters of transgenic plantlets subjected to a water deficit suggested that plants from line TS4T8An displayed lower stomatal conductance and a higher proline content. Over-expression of the HbCuZnSOD gene and activation of all ROS-scavenging enzymes also suggested that protection against ROS was more efficient in the TS4T8An transgenic line.
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Affiliation(s)
- J Leclercq
- CIRAD, UMR AGAP, 34 398 Montpellier, France
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Kırış A, Karaman K, Kırış G, Şahin M, Durmuş İ, Kaplan Ş, Örem A, Kutlu M, Ayar A. Left Ventricular Dyssynchrony and Its Effects on Cardiac Function in Patients with Newly Diagnosed Hypertension. Echocardiography 2012; 29:914-22. [DOI: 10.1111/j.1540-8175.2012.01727.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Ozcan M, Ayar A. Modulation of action potential and calcium signaling by levetiracetam in rat sensory neurons. J Recept Signal Transduct Res 2012; 32:156-62. [DOI: 10.3109/10799893.2012.672993] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Kırış A, Karkucak M, Karaman K, Kırış G, Capkın E, Gökmen F, Kutlu M, Çelik Ş, Ayar A. Patients with ankylosing spondylitis have evidence of left ventricular asynchrony. Echocardiography 2012; 29:661-7. [PMID: 22404185 DOI: 10.1111/j.1540-8175.2012.01665.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
OBJECTIVES Ankylosing spondylitis (AS) is a chronic inflammatory disease that often leads to cardiovascular complications including aortic regurgitation and conduction disturbances. Left ventricular (LV) systolic asynchrony is defined as loss of the simultaneous peak contraction of corresponding cardiac segments. The aim of this study was to evaluate LV systolic asynchrony noninvasively in patients with AS by using tissue synchrony imaging (TSI). METHODS Asynchrony was evaluated in 77 AS patients (61 male, mean age 36.4 ± 10 years) and 40 controls (35 male, mean age 39.1 ± 8.2 years). All study population underwent a comprehensive echocardiographic evaluation including TSI. The time to regional peak systolic velocity (Ts) during the ejection phase in LV was measured from TSI images by the six-basal and six-midsegmental model, and four TSI parameters of systolic asynchrony were computed. RESULTS The baseline demographic and echocardiographic characteristics were similar between the patients enrolled and controls. All TSI parameters of LV asynchrony were prolonged in patients with AS compared to controls: the standard deviation (SD) of the 12 LV segments Ts (39.6 ± 19.6 vs. 24.7 ± 11.6, P < 0.001); the maximal difference in Ts between any 2 of the 12 LV segments (122.1 ± 52.9 vs. 82.2 ± 38.6, P < 0.001); the SD of the six basal LV segments (33.5 ± 20.2 vs. 23 ± 13.3, P = 0.008); and the maximal difference in Ts between any two of the six basal LV segments (84.6 ± 48.1 vs. 60.4 ± 34.6, P = 0.008). The asynchrony parameters were significantly correlated with index of myocardial performance (Tei index) and peak systolic mitral annular velocity. CONCLUSION TSI showed presence of LV systolic asynchrony in patients with AS which may account for the cardiovascular complications of AS.
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Affiliation(s)
- Abdulkadir Kırış
- Department of Cardiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey.
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Capkin E, Karkucak M, Kiris A, Durmus I, Karaman K, Karaca A, Tosun M, Ayar A. Anti-TNF- therapy may not improve arterial stiffness in patients with AS: a 24-week follow-up. Rheumatology (Oxford) 2012; 51:910-4. [DOI: 10.1093/rheumatology/ker434] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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Kelestimur H, Ozcan M, Kacar E, Alcin E, Yılmaz B, Ayar A. Melatonin elicits protein kinase C-mediated calcium response in immortalized GT1-7 GnRH neurons. Brain Res 2011; 1435:24-8. [PMID: 22177776 DOI: 10.1016/j.brainres.2011.11.040] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Revised: 11/18/2011] [Accepted: 11/18/2011] [Indexed: 12/16/2022]
Abstract
Melatonin is suggested to have effects on hypothalamic-pituitary-gonadal (HPG) axis. The pulsatile pattern of GnRH release, which results in the intermittent release of gonadotropic hormones from the pituitary, has a critical importance for reproductive function but the factors responsible from this release pattern are not known. Calcium is a second messenger involved in hormone release. Therefore, investigation of the effects of melatonin on intracellular free calcium levels ([Ca(2+)](i)) would provide critical information on hormone release in immortalized GnRH neurons. The pattern of melatonin-induced intracellular calcium signaling was investigated by fluorescence calcium imaging using the immortalized GnRH-secreting GT1-7 hypothalamic neurons. Melatonin caused a significant increase in [Ca(2+)](i,) which was greatly blocked by luzindole, a melatonin antagonist, or attenuated by pre-treatment with protein kinase C inhibitor. This study suggests that melatonin seems to have a direct effect on GnRH neurons.
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Affiliation(s)
- Haluk Kelestimur
- Firat University, Medical School, Department of Physiology, Elazig, Turkey.
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Capkin E, Kiris A, Karkucak M, Durmus I, Gokmen F, Cansu A, Tosun M, Ayar A. Investigation of effects of different treatment modalities on structural and functional vessel wall properties in patients with ankylosing spondylitis. Joint Bone Spine 2011; 78:378-82. [DOI: 10.1016/j.jbspin.2010.09.023] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2010] [Accepted: 09/22/2010] [Indexed: 11/25/2022]
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Ozcan M, Alcin E, Ayar A, Yılmaz B, Sandal S, Kelestimur H. Kisspeptin-10 elicits triphasic cytosolic calcium responses in immortalized GT1-7 GnRH neurones. Neurosci Lett 2011; 492:55-8. [DOI: 10.1016/j.neulet.2011.01.054] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Revised: 12/21/2010] [Accepted: 01/21/2011] [Indexed: 11/28/2022]
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