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  1. Article ; Online: Postoperative and Long-Term Endocrinologic Complications of Craniopharyngioma.

    Bereket, Abdullah

    Hormone research in paediatrics

    2021  Volume 93, Issue 9-10, Page(s) 497–509

    Abstract: Background: Craniopharyngioma (CP), despite being a malformational tumor of low histological grade, causes considerable morbidity and mortality mostly due to hypothalamo-pituitary dysfunction that is created by tumor itself or its treatment.: Summary!# ...

    Abstract Background: Craniopharyngioma (CP), despite being a malformational tumor of low histological grade, causes considerable morbidity and mortality mostly due to hypothalamo-pituitary dysfunction that is created by tumor itself or its treatment.
    Summary: Fluid-electrolyte disturbances which range from dehydration to fluid overload and from hypernatremia to hyponatremia are frequently encountered during the acute postoperative period and should be carefully managed to avoid permanent neurological sequelae. Hypopituitarism, increased cardiovascular risk, hypothalamic damage, hypothalamic obesity, visual and neurological deficits, and impaired bone health and cognitive function are the morbidities affecting the well-being of these patients in the long term. Key Messages: Timely and optimal treatment of early postoperative and long-term complications of CP is crucial for preserving quality of life of these patients.
    MeSH term(s) Craniopharyngioma/complications ; Craniopharyngioma/surgery ; Humans ; Neurosurgical Procedures/adverse effects ; Pituitary Diseases/etiology ; Postoperative Complications/etiology ; Water-Electrolyte Imbalance/etiology
    Language English
    Publishing date 2021-04-01
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2537278-6
    ISSN 1663-2826 ; 1663-2818
    ISSN (online) 1663-2826
    ISSN 1663-2818
    DOI 10.1159/000515347
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Editorial: Neonatal Screening for Congenital Adrenal Hyperplasia in Turkey

    Bereket, Abdullah

    Journal of clinical research in pediatric endocrinology

    2019  Volume 11, Issue 1, Page(s) 1–3

    MeSH term(s) Adrenal Hyperplasia, Congenital/diagnosis ; Adrenal Hyperplasia, Congenital/epidemiology ; Humans ; Infant, Newborn ; Neonatal Screening/methods ; Turkey/epidemiology
    Language English
    Publishing date 2019-02-14
    Publishing country Turkey
    Document type Journal Article
    ZDB-ID 2641608-6
    ISSN 1308-5735 ; 1308-5727
    ISSN (online) 1308-5735
    ISSN 1308-5727
    DOI 10.4274/jcrpe.galenos.2019.2019.0001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Nutritional rickets: nature or nurture?

    Bereket, Abdullah

    Expert review of endocrinology & metabolism

    2019  Volume 1, Issue 5, Page(s) 661–671

    Abstract: Rickets is a mineralization disorder of the growing bone. Nutritional rickets is still prevalent in many parts of the world. Although vitamin D deficiency plays a central role in the pathogenesis of this disease, calcium deficiency and genetic factors ... ...

    Abstract Rickets is a mineralization disorder of the growing bone. Nutritional rickets is still prevalent in many parts of the world. Although vitamin D deficiency plays a central role in the pathogenesis of this disease, calcium deficiency and genetic factors may also cause or contribute to the development of rickets. This review will focus on the classical form of nutritional rickets: vitamin D deficiency rickets. Epidemiology, ethiopathogenesis, risk factors, the current clinical picture, diagnosis, treatment and prevention of nutritional rickets will be reviewed.
    Language English
    Publishing date 2019-02-12
    Publishing country England
    Document type Journal Article
    ISSN 1744-8417
    ISSN (online) 1744-8417
    DOI 10.1586/17446651.1.5.661
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: A Critical Appraisal of the Effect of Gonadotropin-Releasing Hormon Analog Treatment on Adult Height of Girls with Central Precocious Puberty.

    Bereket, Abdullah

    Journal of clinical research in pediatric endocrinology

    2017  Volume 9, Issue Suppl 2, Page(s) 33–48

    Abstract: Central precocious puberty (CPP) is a diagnosis that pediatric endocrinologists worldwide increasingly make in girls of age 6-8 years and is mostly idiopathic. Part of the reason for increasing referral and diagnosis is the perception among the doctors ... ...

    Abstract Central precocious puberty (CPP) is a diagnosis that pediatric endocrinologists worldwide increasingly make in girls of age 6-8 years and is mostly idiopathic. Part of the reason for increasing referral and diagnosis is the perception among the doctors as well as the patients that treatment of CPP with long-acting gonadotropin-releasing hormon analogues (GnRHa) promote height of the child. Although, the timing and the tempo of puberty does influence statural growth and achieved adult height, the extent of this effect is variable depending on several factors and is modest in most cases. Studies investigating GnRHa treatment in girls with idiopathic CPP demonstrate that treatment is able to restore adult height compromised by precocious puberty. However, reports on untreated girls with precocious puberty demonstrate that some of these girls achieve their target height without treatment as well, thus, blurring the net effect of GnRHa treatment on height in girls with CPP. Clinical studies on treatment of girls with idiopathic CPP on adult stature suffers from the solid evidence-base due mainly to the lack of well-designed randomized controlled studies and our insufficiencies of predicting adult height of a child with narrow precision. This is particularly true for girls in whom age of pubertal onset is close to physiological age of puberty, which are the majority of cases treated with GnRHa nowadays. Heterogeneous nature of pubertal tempo (progressive vs. nonprogressive) leading to different height outcomes also complicates the interpretation of the results in both treated and untreated cases. This review will attemp to summarize and critically appraise available data in the field.
    MeSH term(s) Body Height/drug effects ; Child ; Female ; Gonadotropin-Releasing Hormone/analogs & derivatives ; Growth Disorders/etiology ; Humans ; Puberty, Precocious/drug therapy
    Chemical Substances Gonadotropin-Releasing Hormone (33515-09-2)
    Language English
    Publishing date 2017-12-27
    Publishing country Turkey
    Document type Journal Article ; Review
    ZDB-ID 2641608-6
    ISSN 1308-5735 ; 1308-5727
    ISSN (online) 1308-5735
    ISSN 1308-5727
    DOI 10.4274/jcrpe.2017.S004
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Endocrinologic Consequences of Pediatric Posterior Fossa Tumours.

    Bereket, Abdullah

    Journal of clinical research in pediatric endocrinology

    2015  Volume 7, Issue 4, Page(s) 253–259

    Abstract: Intracranial tumors are the second most frequent malignancies in children and posterior fossa is a common location for these neoplasias during childhood. Recent advances in surgical techniques, radiotherapy and chemotherapy resulted in dramatic increase ... ...

    Abstract Intracranial tumors are the second most frequent malignancies in children and posterior fossa is a common location for these neoplasias during childhood. Recent advances in surgical techniques, radiotherapy and chemotherapy resulted in dramatic increase in the survival rates of these children, however they are still source of a significant morbidity and mortality. Endocrinological complications and late sequelae of childhood posterior fossa tumours are common among the survivors of these tumours and include growth retardation, hypothyroidism, pubertal disorders, gonadal dysfunction and osteopenia. These complications have significant impact on the quality of life of the survivors of childhood posterior fossa tumours. In this paper, the frequency, etiology, and management of these complications will be reviewed.
    MeSH term(s) Adrenocorticotropic Hormone/deficiency ; Antineoplastic Agents/adverse effects ; Antineoplastic Agents/toxicity ; Child ; Dwarfism/chemically induced ; Female ; Gonadal Disorders/chemically induced ; Growth Disorders/chemically induced ; Humans ; Infratentorial Neoplasms/drug therapy ; Male ; Thyroid Diseases/chemically induced
    Chemical Substances Antineoplastic Agents ; Adrenocorticotropic Hormone (9002-60-2)
    Language English
    Publishing date 2015-12
    Publishing country Turkey
    Document type Journal Article ; Review
    ZDB-ID 2641608-6
    ISSN 1308-5735 ; 1308-5727
    ISSN (online) 1308-5735
    ISSN 1308-5727
    DOI 10.4274/jcrpe.2135
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Corrigendum to "Associations between sleep characteristics and glycemic variability in youth with type 1 diabetes" [Sleep Med. 109 (2023) 132-142].

    İpar, Necla / Boran, Perran / Barış, Hatice Ezgi / Us, Mahmut Caner / Aygün, Burcu / Haliloğlu, Belma / Gökçe, Tuğba / Can, Ecem / Eviz, Elif / İnan, Neslihan Gökmen / Mutlu, Gül Yeşiltepe / Bereket, Abdullah / Hatun, Şükrü

    Sleep medicine

    2023  Volume 113, Page(s) 422

    Language English
    Publishing date 2023-09-20
    Publishing country Netherlands
    Document type Published Erratum
    ZDB-ID 2012041-2
    ISSN 1878-5506 ; 1389-9457
    ISSN (online) 1878-5506
    ISSN 1389-9457
    DOI 10.1016/j.sleep.2023.09.016
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Fibroblast Growth Factor-23 and Matrix Extracellular Phosphoglycoprotein Levels in Healthy Children and, Pregnant and Puerperal Women.

    Ozsen, Ahu / Furman, Andrzej / Guran, Tulay / Bereket, Abdullah / Turan, Serap

    Hormone research in paediatrics

    2020  Volume 92, Issue 5, Page(s) 302–310

    Abstract: Introduction and objective: Fibroblast growth factor (FGF-23) and matrix extracellular phosphoglycoprotein (MEPE) are bone-related factors and their role in physiologic conditions and in different life stages are unknown. We aimed to evaluate age- and ... ...

    Abstract Introduction and objective: Fibroblast growth factor (FGF-23) and matrix extracellular phosphoglycoprotein (MEPE) are bone-related factors and their role in physiologic conditions and in different life stages are unknown. We aimed to evaluate age- and pregnancy-related changes in MEPE and FGF-23 levels and their correlations with calcium (Ca)-phosphate (PO4) metabolism.
    Methods: The study population included 96 healthy children (50 females) and 31 women (11 healthy, 10 pregnant, and 10 lactating). Intact FGF-23 (iFGF-23), MEPE, ferritin, parathyroid hormone (PTH), 25-OH vitamin D, alkaline phosphatase (ALP), IGF-I, IGFBP-3 and, Ca, PO4 and creatine (Cre) in serum (S) and urine (U) samples were determined. The renal phosphate threshold (TmPO4/GFR) and z-scores for the parameters that show age-related changes were calculated.
    Results: Serum iFGF-23 concentrations showed nonsignificant changes with age; however, MEPE decreased with age, reaching the lowest levels after 7 years. Additionally, higher serum MEPE concentrations were observed during pregnancy. Other than ALP, all other examined parameters demonstrated age-related changes. ALP, BUN, S-Cre, and U-Ca/Cre showed puerperal and pregnancy related changes together with MEPE. iFGF-23 was positively correlated with S-PO4 and TmPO4/GFR. MEPE was positively correlated with S-Ca, S-PO4 and TmPO4/GFR and negatively correlated with PTH, IGF-1, and IGFBP-3.
    Conclusion: Not iFGF-23 but MEPE showed age-dependent changes and was affected by pregnancy. Although, MEPE and iFGF-23 did not correlate with each other, they seem to affect serum and urinary phosphate in the same direction. Additionally, we found evidence that ferritin and growth factors might have a role in serum calcium and phosphate regulation.
    MeSH term(s) Adolescent ; Adult ; Child ; Child, Preschool ; Extracellular Matrix Proteins/blood ; Extracellular Matrix Proteins/urine ; Female ; Fibroblast Growth Factors/blood ; Fibroblast Growth Factors/urine ; Glycoproteins/blood ; Glycoproteins/urine ; Humans ; Infant ; Lactation/blood ; Lactation/urine ; Male ; Phosphoproteins/blood ; Phosphoproteins/urine ; Pregnancy/blood ; Pregnancy/urine
    Chemical Substances Extracellular Matrix Proteins ; Glycoproteins ; Phosphoproteins ; Fibroblast Growth Factors (62031-54-3) ; fibroblast growth factor 23 (7Q7P4S7RRE)
    Language English
    Publishing date 2020-03-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2537278-6
    ISSN 1663-2826 ; 1663-2818
    ISSN (online) 1663-2826
    ISSN 1663-2818
    DOI 10.1159/000506477
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Vitamin D Status Across Age Groups in Turkey: Results of 108,742 Samples from a Single Laboratory

    Yeşiltepe-Mutlu, Gül / Aksu, Ekin Deniz / Bereket, Abdullah / Hatun, Şükrü

    Journal of clinical research in pediatric endocrinology

    2020  Volume 12, Issue 3, Page(s) 248–255

    Abstract: Objective: The aim was to determine vitamin D status in the general population in Turkey between 2011 and 2016, and to evaluate the effectiveness of the national vitamin D supplementation programme.: Methods: Serum 25-hydroxyvitamin D (25-OHD) ... ...

    Abstract Objective: The aim was to determine vitamin D status in the general population in Turkey between 2011 and 2016, and to evaluate the effectiveness of the national vitamin D supplementation programme.
    Methods: Serum 25-hydroxyvitamin D (25-OHD) measurement data were retrieved from an internationally accredited laboratory, operating nationwide. A total of 108,742 measurements of 25-OHD were analyzed using the cut-off values of 0-11 ng/mL, 12-19 ng/mL, 20-49 ng/mL, 50-70 ng/mL and >70 ng/mL for vitamin D deficiency, insufficiency, sufficiency, possibly harmful and excess respectively.
    Results: The mean±standard deviation 25-OHD level was 21.6±13.3 ng/mL. Mean 25-OHD concentrations by age groups were: 37.3 ng/mL, 30.1 ng/mL and 23.7 ng/mL for <1, 1-10 and 11-18 year old groups, respectively. Mean 25-OHD levels of children <1 year and 1-3 years of age were significantly higher than those found in other age groups. The prevalence of vitamin D deficiency (<12 ng/mL) was lowest in children at 1-3 years of age (5%). In subjects older than 18 years of age, mean 25-OHD levels were 18.2 ng/mL, 20.1 ng/mL, 21.9 ng/mL and 21.1 ng/mL for age groups 19-30, 31-50, 51-70 and >70 years, respectively.
    Conclusion: Successful implementation of the national vitamin D supplementation programme, appears to have nearly eliminated vitamin D deficiency for children under 1-years of age. However, the positive impact of the vitamin D supplementation diminishes as children get older suggesting that supplementation may be required in the older children and adults. In addition, improved awareness of the benefits and risks of excess vitamin D should prevent unnecessary and excessive use of vitamin D supplements.
    MeSH term(s) Adolescent ; Adult ; Age Factors ; Aged ; Aged, 80 and over ; Aging/blood ; Child ; Child, Preschool ; Female ; Humans ; Infant ; Infant, Newborn ; Laboratories ; Male ; Middle Aged ; Turkey/epidemiology ; Vitamin D/analogs & derivatives ; Vitamin D/blood ; Vitamin D Deficiency/blood ; Vitamin D Deficiency/diagnosis ; Vitamin D Deficiency/epidemiology ; Young Adult
    Chemical Substances Vitamin D (1406-16-2) ; 25-hydroxyvitamin D (A288AR3C9H)
    Language English
    Publishing date 2020-01-02
    Publishing country Turkey
    Document type Journal Article
    ZDB-ID 2641608-6
    ISSN 1308-5735 ; 1308-5727
    ISSN (online) 1308-5735
    ISSN 1308-5727
    DOI 10.4274/jcrpe.galenos.2019.2019.0097
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: A novel deletion involving the first GNAS exon encoding Gsα causes PHP1A without methylation changes at exon A/B.

    Campbell, Devon / Reyes, Monica / Kaygusuz, Sare Betul / Abali, Saygın / Guran, Tulay / Bereket, Abdullah / Kagami, Masayo / Turan, Serap / Jüppner, Harald

    Bone

    2022  Volume 157, Page(s) 116344

    Abstract: Individuals affected by pseudohypoparathyroidism type 1A (PHP1A) display hyperphosphatemia and hypocalcemia despite elevated PTH levels, as well as features of Albright Hereditary Osteodystrophy (AHO). PHP1A is caused by variants involving the maternal ... ...

    Abstract Individuals affected by pseudohypoparathyroidism type 1A (PHP1A) display hyperphosphatemia and hypocalcemia despite elevated PTH levels, as well as features of Albright Hereditary Osteodystrophy (AHO). PHP1A is caused by variants involving the maternal GNAS exons 1-13 encoding the stimulatory G protein α-subunit (Gsα). MLPA and aCGH analysis led in a male PHP1A patient to identification of a de novo 1284-bp deletion involving GNAS exon 1. This novel variant overlaps with a previously identified 1438-bp deletion in another PHP1A patient (ref. Li et al. (2020) [13], patient 2) that extends from the exon 1 promoter into the up-stream intronic region. This latter deletion is associated with reduced methylation at GNAS exon A/B, i.e. the differentially methylated region (DMR) that is demethylated in most pseudohypoparathyroidism type 1B (PHP1B) patients. In contrast, genomic DNA from our patient revealed no evidence for an epigenetic GNAS defect as determined by MS-MLPA and pyrosequencing. These findings thus reduce the region, which, in addition to other nucleotide sequences telomeric of exon A/B, may undergo histone modifications or interacts with transcription factors and possibly as-yet unknown proteins that are required for establishing the maternal methylation imprints at this site. Taken together, nucleotide deletions or changes within an approximately 1300-bp region telomeric of exon A/B could be a cause of PHP1B variants with complete or incomplete loss-of-methylation at the exon A/B DMR. In addition, when investigating patients with suspected PHP1A, MLPA should be considered to search for structural abnormalities within this difficult to analyze genomic region comprising GNAS exon 1.
    MeSH term(s) Chromogranins/genetics ; DNA Methylation ; Exons ; GTP-Binding Protein alpha Subunits, Gs/genetics ; Humans ; Male ; Pseudohypoparathyroidism/genetics ; Pseudohypoparathyroidism
    Chemical Substances Chromogranins ; GNAS protein, human (EC 3.6.1.-) ; GTP-Binding Protein alpha Subunits, Gs (EC 3.6.5.1)
    Language English
    Publishing date 2022-01-29
    Publishing country United States
    Document type Case Reports ; Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 632515-4
    ISSN 1873-2763 ; 8756-3282
    ISSN (online) 1873-2763
    ISSN 8756-3282
    DOI 10.1016/j.bone.2022.116344
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Hypothalamic obesity in children: pathophysiology to clinical management.

    Haliloglu, Belma / Bereket, Abdullah

    Journal of pediatric endocrinology & metabolism : JPEM

    2015  Volume 28, Issue 5-6, Page(s) 503–513

    Abstract: Hypothalamic obesity (HyOb) is a complex neuroendocrine disorder caused by damage to the hypothalamus, which results in disruption of energy regulation. The key hypothalamic areas of energy regulation are the ARC (arcuate nucleus), the VMH (ventromedial ... ...

    Abstract Hypothalamic obesity (HyOb) is a complex neuroendocrine disorder caused by damage to the hypothalamus, which results in disruption of energy regulation. The key hypothalamic areas of energy regulation are the ARC (arcuate nucleus), the VMH (ventromedial hypothalamus), the PVN (paraventriculer nuclei) and the LHA (lateral hypothalamic area). These pathways can be disrupted mechanically by hypothalamic tumors, neurosurgery, inflammatory disorders, radiotherapy and trauma or functionally as such seen in genetic diseases. Rapid weight gain and severe obesity are the most striking features of HyOb and caused by hyperphagia, reduced basal metabolic rate (BMR) and decreased physical activity. HyOb is usually unresponsive to diet and exercise. Although, GLP-1 and its anologs seem to be a new agent, there is still no curative treatment. Thus, prevention is of prime importance and the clinicians should be alert and vigilant in patients at risk for development of HyOb.
    MeSH term(s) Child ; Energy Metabolism ; Humans ; Hypothalamus/metabolism ; Hypothalamus/physiopathology ; Obesity/metabolism ; Obesity/physiopathology ; Obesity/therapy
    Language English
    Publishing date 2015-05
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 1231070-0
    ISSN 2191-0251 ; 0334-018X
    ISSN (online) 2191-0251
    ISSN 0334-018X
    DOI 10.1515/jpem-2014-0512
    Database MEDical Literature Analysis and Retrieval System OnLINE

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