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Aim: : To measure obestatin levels in the blood and saliva samples of normal-weight patients with polycystic ovary syndrome (PCOS) in comparison with normal-weight healthy controls, and to determine whether there were relationships between blood and/ or salivary obestatin levels and other measured parameters. Materials and Methods: Fifteen healthy women and 15 patients with PCOS, all of which had normal weight, were included in the study. Participants' age, height, weight, menstrual characteristics, hormone levels, body mass index, waist/hip ratio, and modifed Ferriman-Gallwey (FG) scores were recorded. Obestatin levels were measured in both fasting blood and saliva samples. Homeostasis Model Assessment (HOMA-IR) was used to predict insulin resistance. Results: In the PCOS group, menstrual cycle duration and FG scores were signifcantly higher (P-value, <0.001, <0.001, respectively). The levels of luteinizing hormone, total testosterone and androstenedione were signifcantly higher in the PCOS group than in the control group (P-value, 0.001, 0.009, 0.004, respectively). In the PCOS group, blood obestatin level was 1265.2 ± 221.9 pg/ml, salivary obestatin level was 3095.33 ± 310.2 pg/ml; whereas the control group demonstrated lower levels of 939.66 ± 72.3 pg/ml and 2611.20 ± 217.1 pg/mL, respectively. However, no statistically signifcant difference was found between the PCOS and control groups when comparing obestatin levels in blood or saliva (P-value, 0.218, 0.369, respectively). No correlation was found between blood and salivary obestatin levels in either group. Finally, obestatin levels were not associated with any of the other measured parameters. Conclusion: Our results suggest that increased levels of obestatin, albeit in a small amount that would not be statistically signifcant in normal weight patients with PCOS, may have signifcant effects on weight control in these patients. In addition, our fndings show that saliva sample can be used as an alternative to blood sample in the measurement of obestatin level in patients with PCOS. [ABSTRACT FROM AUTHOR]

Objective: To investigate ghrelin and obestatin expression in serous ovarian tumours. Materials and methods: Preparations of deparaffinized blocks obtained from the pathology archives of a total of 47 previously diagnosed cases of benign serous tumour ( n = 20), borderline serous tumour ( n = 7) and malignant serous tumour ( n = 20) were subjected to immunohistochemical examination to find out ghrelin and obestatin expressions. Results: Mean ghrelin expressions decreased significantly in the benign group, relative to the malignant group ( p < 0.05), while there was no significant change in mean obestatin expression. It was established that rates of preparations with moderate and severe ghrelin and obestatin expression displayed a significant increase from benign to malignant ones ( p < 0.05). Conclusion: The fact that rates of preparations with severe expression correlated with an increase in malignancy suggests that ghrelin and obestatin may be effective in the malignant transformation in at least some cases. [ABSTRACT FROM AUTHOR]

Abstract: Objectives: The present study aims to establish the levels of acylated ghrelin, desacylated ghrelin, obestatin and preptin, during pregnancy and the postpartum period in pregnant women with Gestational Diabetes Mellitus (GDM) and healthy pregnancy women. Design and methods: The study registered 20 pregnant women with GDM and 20 healthy pregnant women. Fasting venous blood samples were collected from all cases between weeks 24 and 28 of pregnancy and after 24h postpartum. Hormones were analyzed using ELISA method. Results: Serum acylated ghrelin (p:0.001), desacylated ghrelin (p:0.001), obestatin (p:0.006) and preptin (p:0.001) levels were all found statistically higher in both groups during the postpartum period, when compared to the pregnancy period. A positive correlation was established between desacylated ghrelin and acylated ghrelin (p:0.008), desacylated ghrelin and preptin (p:0.012) and preptin and insulin (p:0.039) in the GDM group during pregnancy. Conclusions: The studied hormones (especially desacylated ghrelin and obestatin) are critical in GDM pathophysiology based on the comparison of measure after and before the delivery. [Copyright &y& Elsevier]

Abstract: Objectives: The goal of this study was to compare levels of acyl and des-acyl ghrelin, obestatin, nesfatin-1 and leptin in healthy gravidas to hyperemesis gravidarum (HG) patients. Design and methods: Twenty pregnant women with HG and twenty healthy pregnant women all of similar ages, BMI and all at similar pregnancy development comprised the study cohort. Fasting serum samples were obtained and measured for acyl and des-acyl ghrelin, leptin, obestatin and nesfatin-1. Results: Nesfatin-1 concentrations in the HG group were higher compared to the control group whereas; leptin concentrations during pregnancy were lower in the HG group as compared to the control group. The two groups did not differ with regard to acyl and des-acyl ghrelin and obestatin. Conclusion: This pilot study suggests a possible role of leptin and nesfatin-1, which might be involved in the pathology of the disease. [Copyright &y& Elsevier]

Abstract: Objective: The peptide hormones ghrelin and leptin have been found in blood and breast milk. This study was undertaken to investigate whether breast milk also contains obestatin, which is derived from the same gene as ghrelin but has opposite actions, and to characterize the relations among serum and milk ghrelin, obestatin, and leptin levels in lactating mothers. Methods: Venous blood, colostrum, and mature milk were obtained from healthy lactating women (n = 31) just before suckling. The ghrelin and obestatin concentrations were determined by radioimmunoassay. Leptin levels were measured by enzyme-amplified sensitivity immunoassay. Results: Obestatin levels in colostrum (538.9 pg/mL) and mature milk (528.5 pg/mL) were more than twice the corresponding blood levels (270.3 and 289.4 pg/mL, respectively). In contrast, leptin levels in colostrum (2.01 ng/mL) and mature milk (2.04 ng/mL) were more than five-fold lower than the corresponding blood levels (11.54 ng/mL). There was no correlation between breast milk ghrelin levels and leptin (r = −0.18, P > 0.05). However, there was a positive correlation between leptin levels in breast milk and blood (r = 0.369, P < 0.05). Conclusion: The origin of milk obestatin is not currently known, but it comes from the blood or breast and may drain through the mammary glands into the milk. Ghrelin, obestatin, and leptin in the milk may directly affect appetite and their levels may be related to the regulation of energy balance and the pathogenesis of obesity. [Copyright &y& Elsevier]