Keleştimur, Haluk
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Name Variants
H., Keleştimur
Keleştimur, Haluk
Kelestimur H.
Haluk, Keleştimur
Keleştimur, H.
KELESTiMUR Haluk
Haluk KELESTiMUR
KELESTIMUR H.
Haluk Keleştimur
KELEŞTIMUR Haluk
Kelestimur, H.
Haluk KELEŞTIMUR
Kelestimur, Haluk
Haluk Kelestimur
Kelestimur Haluk
Keleştimur Haluk
Keleştimur, Haluk
Keleştimur, Haluk
Kelestimur H.
Haluk, Keleştimur
Keleştimur, H.
KELESTiMUR Haluk
Haluk KELESTiMUR
KELESTIMUR H.
Haluk Keleştimur
KELEŞTIMUR Haluk
Kelestimur, H.
Haluk KELEŞTIMUR
Kelestimur, Haluk
Haluk Kelestimur
Kelestimur Haluk
Keleştimur Haluk
Keleştimur, Haluk
Job Title
Prof.Dr.
Email Address
haluk.kelestimur@okan.edu.tr
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Scholarly Output
14
Articles
11
Citation Count
1
Supervised Theses
0
14 results
Scholarly Output Search Results
Now showing 1 - 10 of 14
Conference Object Citation Count: 0The Effects of Chronic Asprosin Administration on Monoamine Levels in the Arcuate Nucleus, Ventromedial Hypothalamus and Dorsomedial Hypothalamus Regions(Wiley, 2023) Ozdede, Mehmet Ridvan; Kacar, Emine; Oz, Zeynep Dila; Ozgen, Aslisah; Serhatlioglu, Ihsan; Yilmaz, Bayram; Kelestimur, Haluk; Fizyoloji / Physiology[No Abstract Available]Article Citation Count: 0Asprosin-induced alterations in female rat puberty and reproductive hormonal profiles(Taylor & Francis Ltd, 2024) Kacar, Emine; Oz, Zeynep Dila; Serhatlioglu, Ihsan; Tektemur, Nalan Kaya; Ozdede, Mehmet Ridvan; Yalcin, Tugce; Kelestimur, Haluk; Fizyoloji / PhysiologyObjectiveTo investigate the comprehensive effects of daily chronic asprosin administration on various pubertal and reproductive parameters in female rats. This study aims to elucidate the role of asprosin in regulating the onset of puberty and its influence on hormonal profiles and ovarian histology.MethodsAsprosin was administered intraperitoneally (i.p.) at a dose of 500 ng/kg daily for eight weeks. Hormonal assays and histological analyses were performed to evaluate the effects of asprosin on the onset of puberty and reproductive function.ResultsDaily chronic administration of asprosin accelerated the onset of the first oestrus. Hormonal assays revealed significant elevations in serum levels of Follicle-Stimulating Hormone (FSH) and Oestradiol (E2), while Inhibin B levels decreased. Histological evaluations demonstrated an increased number of primary and secondary follicles in ovarian tissue, without affecting primordial follicle counts or reproductive organ weights.ConclusionsRole of adipokines in regulating puberty and reproductive function has increasingly gained recognition. This study aimed to provide the first comprehensive examination of the effects of daily chronic asprosin administration on pubertal and reproductive parameters in female rats. Utilising hormonal assays and histological analyses, asprosin was administered intraperitoneally (i.p.) at a dose of 500 ng/kg, daily, for eight weeks. Our findings revealed that daily chronic administration of asprosin accelerated the onset of the first oestrus. Hormonal assays showed significant elevations in serum levels of Follicle-Stimulating Hormone (FSH) and Oestradiol (E2), while Inhibin B levels decreased. Histological evaluations demonstrated an increased number of primary and secondary follicles in ovarian tissue, without affecting primordial follicle counts or reproductive organ weights. These results provide new insights into asprosin's role in advancing the age of first oestrus and modulating hormonal profiles, thereby offering potential benefits to the female reproductive system.Conference Object Citation Count: 0Reproductive Physiology and Adipo-Myokines(Wiley, 2023) Kelestimur, Haluk; Fizyoloji / Physiology[No Abstract Available]Article Citation Count: 0Treadmill exercise has healing effects on obesity-induced sexual behavior disorder through kisspeptin and kiss1R expression in male rats(C M B Assoc, 2023) Kacar, Emine; Bulmus, Ozgur; Ercan, Zubeyde; Kavuran, Ilay Buran; Zorlu, Gokhan; Tan, Fatih; Kelestimur, Haluk; Fizyoloji / Physiology; Fizyoloji / PhysiologyThe basic objective of this study was to examine the possible effects of treadmill exercise on obesity-related sexual behavior disorder in obese male rats and the role of kisspeptin in this effect. The rats were separated from their mothers at the age of 3 weeks, and classified into four groups as Control (C): normal diet-sedentary group, Exercise (E): normal diet-exercise group, Obese (O): high-fat diet-sedentary group, Obese + Exercise (O+E): high-fat diet-exercise grouSexual behavioral testing was conducted in the rats. At the end of the study, brain samples were taken from the animals for gene expression analyses. The treadmill exercise caused a significant increase in the O+E Group compared to the O Group in kisspeptin and kiss1R gene expression and in EF, ML, IL, MF, IF, III, EL, PEI, IR1, MFT, IFT, IRT sexual behavior parameters (p<0.05), and a significant decrease in ML, IL, III, EL sexual behavior parameters (p<0.05). Treadmill exercise caused a significant decrease in EF, ML, IL, MF, IF, III, EL, PEI, IR1, MFT, IFT, IRT sexual behavior parameters and kisspeptin and kiss1R gene expression in the hypothalamus, hippocampus, prefrontal cortex and corpus striatum in E Group compared to C Group (p<0.05), and a significant increase in ML, IL, III, EL sexual behavior parameters (p<0.05). Based on this effect, we believe that it is caused by an increase in kisspeptin and kiss1R expression in the hypothalamus, hippocampus, prefrontal cortex and corpus striatum. In conclusion, treadmill exerciseinduced kisspeptin secretion may increase GnRH secretion and cause hypothalamo-pituitary gonadal axis activation and ameliorative effect on deteriorated sexual function.Article Citation Count: 0Modulation of Melatonin Receptors Regulates Reproductive Physiology: The Impact of Agomelatine on the Estrus Cycle, Gestation, Offspring, and Uterine Contractions in Rats(Acad Sciences Czech Republic, inst Physiology, 2023) Kacar, Emine; Tan, Fatih; Sahinturk, Serdar; Zorlu, Gokhan; Serhatlioglu, Ihsan; Bulmus, Ozgur; Kelestimur, Haluk; Fizyoloji / Physiology; Fizyoloji / PhysiologyAgomelatine is a pharmaceutical compound that functions as an agonist for melatonin receptors, with a particular affinity for the MT1 and MT2 receptor subtypes. Its mode of action is integral to the regulation of diverse physiological processes, encompassing the orchestration of circadian rhythms, sleep-wake cycles, and mood modulation. In the present study, we delve into the intricate interplay between agomelatine and the modulation of estrus cycles, gestation periods, offspring numbers, and uterine contractions, shedding light on their collective impact on reproductive physiology. Both in vivo and in vitro experiments were performed. Wistar Albino rats, divided into four groups: two non-pregnant groups (D1 and D2) and two pregnant groups (G1 and G2). The D1 and G1 groups served as control groups, while the D2 and G2 groups received chronic agomelatine administration (10 mg/kg). Uterine contractions were assessed in vitro using myometrial strips. Luzindole, a melatonin receptor antagonist, was employed to investigate the pathway mediating agomelatine's effects on uterine contractions. In in vivo studies, chronic agomelatine administration extended the diestrus phase (p<0.05) in non-pregnant rats, prolonged the gestational period (p<0.01), and increased the fetal count (p<0.01) in pregnant rats. Additionally, agomelatine reduced plasma oxytocin and prostoglandin-E levels (p<0.01) during pregnancy. In vitro experiments showed that agomelatine dose-dependently inhibited spontaneous and oxytocin-induced myometrial contractions. Luzindole (2 mu M) reverse the agomelatine-induced inhibition of myometrial contractions. These findings suggest that agomelatine holds the potential to modulate diverse reproductive parameters during the gestational period, influencing estrus cycling, gestational progression, offspring development, and the orchestration of uterine contractions.Article Citation Count: 0A Suitable Way of Normalizing New Si To Make c and h Unities(Turkic World Mathematical Soc, 2024) Yarman, Ozan; Yarman, Tolga; Fizyoloji / Physiology; Enerji Sistemleri Mühendisliği / Energy Systems EngineeringYarman's Approach, which serves as the basis of YARK gravitation theory (as abbreviated from "Yarman-Arik-Kholmetskii"), together with its recently developed extension QTG (Quantal Theory of Gravity), motivated us to question the suitability of Natural Units commonly used in Quantum Field Theory (QFT) and other areas of physics. That and the consensus of the General Conference on Weights and Measures (CGPM) towards the establishment of "New SI" inspired us to explore an appropriate way of normalizing the metric system in order to make the utmost theoretical speed limit of light c and the Planck Constant h unities, as well as universal constants, respectively. Our metrological approach herein reveals that the correction factor k introduced to the retired definition of vacuum permeability mu(0) - as extracted from an indiscriminate Fine-Structure Constant alpha value - does not suffice to align the computed alpha with the latest experimental measurements of alpha. One may therefore require a rectified value for the elementary charge e along with the need to restore its uncertainty digits. All this is especially relevant within the context of the 20 May 2019 international decision to fix the Planck Constant to a definite value while letting the kilogram vary instead. One thus remarkably ends up with the necessity to either restore the uncertainty parts of the elementary charge in contrast to the SI redefinition, or to recalculate the correction factor k that latterly appears in vacuum permeability, or both. Another far-reaching option is the idea of restituting the uncertainties for the Planck Constant and/or lightspeed too when SI is normalized and then re-normalized without disturbing the meaningfulness of the related physical dimensions.Article Citation Count: 0The antidepressant-like effects of kisspeptin-10 are reversed by kisspeptin antagonist peptide 234 in male rats(Cellular and Molecular Biology Association, 2024) Serhatlioglu, I.; Kacar, E.; Yardimci, A.; Ertugrul, N.U.; Bulmus, O.; Ercan, Z.; Kelestimur, H.; Fizyoloji / PhysiologyKisspeptins are reported to be the most potent activators of the hypothalamus-pituitary-gonadal (HPG) axis known to date. Kisspeptin potently elicits gonadotropin-releasing hormone (GnRH) release and luteinizing hormone (LH) secretion, even in the pre-pubertal period. Beyond the hypothalamus, kisspeptin is also expressed in limbic and paralimbic brain regions, which are areas of the neurobiological network primarily implicated in emotional behaviors alongside sexual functions. Therefore, an increasing body of studies has implicated kisspeptin as having many influences on emotional behaviors. The study was set out to explore if the kisspeptin/GPR54 signaling system is required for the anti-depressant-like effect of kisspeptin-10 (KP-10), besides the regulation of the HPG axis. To test this concept, peptide 234 (P234), a kisspeptin antagonist, was given to the male rats, and its modulatory effect on the anti-depressant-like effects of kisspeptin was investigated by using a forced swimming test (FST). The study has also sought to know whether kisspeptin can exert its effects through adrenergic and serotonergic receptors. To investigate this, the agents yohimbine (Yoh), an alpha-2 adrenergic receptor antagonist, and cyproheptadine (Cry), a non-selective 5-HT2 serotonergic receptor antagonist, were administered in the experiments. Our results indicate that, in rats, the anti-depressant-like effects of KP-10 in a modified rat FST are mediated by GPR54 receptors since the kisspeptin antagonist peptide 234 reversed kisspeptin-induced anti-depressant-like effects. Our data also demonstrate that the antidepressant-like effects of kisspeptin, at least in part, are mediated by an interaction of the alpha-2 adrenergic and 5-HT2 serotonergic receptors. © 2024 Cellular and Molecular Biology Association. All rights reserved.Article Citation Count: 1Effects of Irisin on the Reproductive System of Obese Female Rats Induced by a High-fat Diet(Univ Ljubljana, 2024) Ertugrul, Nazife Ulker; Yardimci, Ahmet; Tektemur, Nalan Kaya; Bulut, Ferah; Ozcan, Mete; Kelestimur, Haluk; Canpolat, Sinan; Fizyoloji / PhysiologyObesity is becoming more common all across the world, causing a variety of health problems, including reproductive disruption. Although the novel, exercise -induced hormone irisin may affect the hypothalamus -pituitary -gonadal axis and reproductive function control, its impact on obesity -induced damage to the female reproductive system is not fully known. Hence, this study aimed to investigate the potential effects of irisin on reproductive hormones and reproductive organs in female rats with obesity induced by a high -fat diet. Forty female rats were divided into four groups: control, irisin, obese, and obese+irisin (n = 10 in each group). After simulating a high -fat diet -induced obesity model (via 60% kcal fat for 12 weeks) in the obese and obese+irisin groups, irisin (100 ng/kg/day via mini -osmotic pumps for about 28 days) was administered subcutaneously to the irisin and obese+irisin groups. Results showed that subcutaneous irisin perfusion increased serum luteinizing hormone (LH), the LH to follicle -stimulating hormone (FSH) ratio (LH/FSH), and progesterone levels while decreasing the histopathological damage in the ovaries of obese rats. On the other hand, endogenous irisin serum concentrations were similar in lean female rats and obese female rats with reproductive disorders. These results suggest that irisin may affect the reproductive axis in obese female rats. An increase in serum LH levels, which trigger ovarian steroidogenesis, and reducing histopathological changes in ovarian tissue could contribute to this effect.Article Citation Count: 0The Effects of Chronic Asprosin Administration on Sense of Smell and Sexual Behavior in Female Rats(Karger, 2023) Oz, Zeynep Dila; Kacar, Emine; Serhatlioglu, Ihsan; Ozdede, Mehmet Ridvan; Atila, Busra; Horoz, Mert Ali; Kelestimur, Haluk; Fizyoloji / Physiology; Fizyoloji / PhysiologyIntroductionAsprosin is an adipokine released from white adipose tissue during fasting and acts through the olfactory receptor. It is known that adipokines play roles in reproductive physiology in mammals. However, there are very few studies conducted on role of asprosin in reproductive functions. There are no studies on its relationship with sexual motivation. It was shown in the literature that administration of asprosin to male mice improves olfaction. It is also known that there is a strong correlation between smell and sexual desire. In view of this, it was hypothesized that chronic administration of asprosin would improve olfactory performance and increase sexual incentive motivation in female rats for male partners. MethodsThis hypothesis was tested by applying the hidden cookie test, sexual incentive test, active research test, and sexual behavior test. The changes in serum hormone levels in female rats that chronically received asprosin were also measured and compared. ResultsChronic asprosin exposure increased olfactory performance, male preference ratio, male investigation preference ratio, activity index, and anogenital investigation behavior. Also, serum oxytocin and estradiol levels increased following chronic administration of asprosin in female rats.Discussion/ConclusionThese data suggest that chronic administration of asprosin can result in increased sexual incentive motivation for opposite-sex in female rats over increased olfactory performance and changes in reproductive hormones.Article Citation Count: 0TRPM2 may be involved in high fructose corn syrup-induced anxiety-like behavior in adult male rats(C M B Assoc, 2023) Serhatlioglu, Ihsan; Zorlu, Gokhan; Yardimci, Ahmet; Ertugrul, Nazife Ulker; Ercan, Zubeyde; Tan, Fatih; Kelestimur, Haluk; Fizyoloji / Physiology; Fizyoloji / PhysiologyExcessive high fructose corn syrup (HFCS) consumption is known to cause oxidative stress, which induces transient receptor potential melastatin type 2 (TRPM2) channel gating. Oxidative stress-induced TRPM2 gating is suggested to play an important role in neurons, indicating a role for the TRPM2 channel in a variety of neuropsychiatric disorders including depression and anxiety. We investigated the effects of HFCS and chronic immobilization stress (CIS) on TRPM2 channel immunoreactivity, anxiety, and depressive-like behaviors in adult male rats. The male rats (n=8/group) were divided into 4 groups: Control, 20% HFCS (F20), 40% HFCS (F40), and stress. The control group received tap water, and F20 and F40 groups were exposed to 20% and 40% HFCS respectively for 14 consecutive days. Rats in the stress group were subjected to immobilization stress for 3 or 6 hours daily in the first and second weeks to induce CIS. Then, light/dark test, open field test (OFT), and tail suspension test (TST) were performed, respectively. In the light/dark test, the time spent in the dark chamber significantly increased in all groups vs the control group (P<0.01). In support of this result, the time spent in the light chamber significantly decreased in all groups vs the control group (P<0.01). Besides, CIS significantly increased depressive-like behavior in the stress group vs the control group (P<0.05). In serum hormone levels, corticosterone (CORT) levels significantly increased in the F40 and stress groups vs the control group (P<0.01). TRPM2 immunoreactivity significantly increased in the hippocampus, prefrontal cortex (PFC), nucleus accumbens (NaC), and amygdala regions by HFCS and CIS treatments. For the first time the present study showed that increased immunoreactivity of the TRPM2 cation channels may be linked to the anxiety-like behavior induced by HFCS.
