Evidence map›Paper›PMID 34763683›Full record

ArticleBMC psychiatry2021

BDNF, GDNF, NGF and Klotho levels and neurocognitive functions in acute term of schizophrenia.

Betul Aslan Turkmen, Esra Yazici, Derya Guzel Erdogan, Mehmet Akif Suda, Ahmet Bulent Yazici

Open access · goldAbstract read
In one paragraph

Article in BMC psychiatry, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed, 1 pooled it
3.3field-weighted citation impact, top 7% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

22 citing papers in PubMed, 1 synthesis or guideline pooled it, 37 citations in OpenAlex.

  1. Pooled it
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  12. Associations Between Klotho Levels,Schizophrenia bulletin open · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 2 institutions in 1 country.

Betul Aslan TurkmenDepartment of Psychiatry, Sakarya Training and Research Hospital, Sakarya, Turkey.
Esra YaziciDepartment of Psychiatry, Sakarya University, Medical Faculty, Sakarya, Turkey. dresrayazici@yahoo.com.
Derya Guzel ErdoganDepartment of Physiology, Sakarya University, Medical Faculty, Sakarya, Turkey.
Mehmet Akif SudaDepartment of Psychiatry, Sakarya Training and Research Hospital, Sakarya, Turkey.
Ahmet Bulent YaziciDepartment of Psychiatry, Sakarya University, Medical Faculty, Sakarya, Turkey.
Sakarya University · TRSakarya Eğitim ve Araştırma Hastanesi · TR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundKlotho and its relationship with neurotrophic factors and cognition in schizophrenia has not yet been investigated. In this study, the hypothesis that the blood serum levels of BDNF, GDNF, NGF and Klotho in schizophrenia patients and healthy controls would be related to cognitive functions was investigated.

methodsIn this study, two groups were assessed: schizophrenia patients (case group) who were hospitalised in the Psychiatry Clinic of Sakarya University Training and Research Hospital and healthy volunteers (control group). The patients were evaluated on the 1st and 20th days of their hospitalisation with the Positive and Negative Syndrome Scale (PANSS), the Brief Psychiatric Rating Scale (BPRS), the General Assessment of Functioning Scale (GAF) and the Clinical Global Impression Scale (CGI). For cognitive assessment, both groups were evaluated with the Wechsler Memory Scale-Visual Production Subtest (Wechsler Memory Scale III-Visual Reproduction Subtest) and the Stroop test.

resultsBDNF, GDNF, NGF and Klotho levels were lower in schizophrenia patients than in healthy controls. In the schizophrenia patients, on the 20th day of treatment, there was a statistically significant increase in BDNF compared to the 1st day of treatment. BDNF, GDNF and Klotho showed positive correlations with some cognitive functions in the healthy controls. BDNF, GDNF, NGF and Klotho levels were intercorrelated and predictive of each other in both groups.

conclusionThis study suggests a relationship between cognitive functions, neurotrophic factors and Klotho. Most of the results are the first of their kind in the extant literature, while other results are either similar to or divergent from those generated in previous studies. Therefore, new, enhanced studies are needed to clarify the role of Klotho and neurotrophic factors in schizophrenia.

Indexed as

Brain-Derived Neurotrophic FactorSchizophreniaCognitionGlial Cell Line-Derived Neurotrophic FactorHumansKlotho ProteinsNerve Growth FactorBDNF protein, humanBrain-Derived Neurotrophic FactorGDNF protein, humanGlial Cell Line-Derived Neurotrophic FactorKlotho ProteinsNerve Growth FactorNGF protein, humanCognitive functionsKlothoNeurodegenerationNeurotrophic factorsSchizophrenia

Identifiers

PMID34763683
PMCPMC8588660
OpenAlexW3213976244

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.