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Effect of l-Carnosine as adjunctive therapy in the management of children with autism spectrum disorder: a randomized controlled study

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Abstract

l-Carnosine is an amino acid that acts as an anti-oxidant, anti-toxic and neuroprotective agent. There is a paucity of data about the effectiveness of l-Carnosine in the management of autism spectrum disorder (ASD) in children. This study aimed at investigating the effectiveness of l-Carnosine as adjunctive therapy in the management of ASD. This was a randomized controlled trial. Children aged 3–6 years with a diagnosis of mild to moderate ASD were assigned to standard care arm (occupational and speech therapy) and intervention care arm (l-Carnosine, 10–15 mg/kg in 2 divided doses) plus standard care treatment. The children were assessed at the baseline and the end of 2 months for the scores of Childhood Autism Rating Scale, Second Edition—Standard Version (CARS2-ST), Autism Treatment Evaluation Checklist (ATEC), BEARS sleep screening tool and 6-item Gastrointestinal Severity Index (6-GSI). Of the sixty-seven children enrolled, sixty-three children had completed the study. No statistically significant difference (p > 0.05) was observed for any of the outcome measures assessed. Supplementation of l-Carnosine did not improve the total score of CARS2-ST, ATEC, BEARS sleep screening tool and 6-GSI scores of children with ASD. Further investigations are needed with more objective assessments to critically validate the effectiveness of l-Carnosine on ASD children for more decisive results.

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Abbreviations

ASD:

Autism spectrum disorder

DSM-5:

Diagnostic and statistical manual of mental disorders, fifth edition

ADHD:

Attention deficit hyperactivity disorder

GABA:

Gamma-amino butyric acid

CAM:

Complementary and alternative medicine

NMDA:

N-Methyl-d-aspartate

mTOR:

Mammalian target of rapamycin

Akt:

Protein kinase B

p70S6K:

Ribosomal protein S6 kinase beta-1

TNF-α:

Tumor necrosis factor-α

CARS-2 ST:

Childhood autism rating scale, second edition-standard version

ATEC:

Autism treatment evaluation checklist

6-GSI:

6 Item gastrointestinal severity index

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Acknowledgements

Authors are thankful to Brio Bliss Life Science Pvt. Ltd., Chennai, India for providing L-Carnosine syrup to study children. We thank James B Adams, Autism/Asperger’s Research Program, Arizona State University, USA, Xue Ming, New Jersey Medical School, Rutgers University, USA and Denise Fulton, Autism Research Institute, USA for providing valuable guidance and questionnaires for this study. We express our gratitude to the children, parents and all the administrators and staff of KCDU and VidyaSudha, Sri Ramachandra learning centre for children with special needs, SRIHER for their support throughout this study. We acknowledge the assistance provided by Sri Ramachandra Founder-Chancellor Shri N.P.V. Ramasamy Udayar Research Fellowship.

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Contributions

DAA, MGR, NU, SC conceived and drafted the study protocol. DAA, NU, SC assisted with subject recruitment and data collection. DAA, MGR was involved in manuscript preparation. MGR provided data analysis and interpretation. DAA, MGR, NU and SC critically revised and gave final approval of the manuscript. All authors agree with their contributions to this work.

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Correspondence to Rajanandh Muhasaparur Ganesan.

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The authors have indicated that they have no conflicts of interest regarding the content of this article.

Ethics approval

The study was approved by the Human Institutional Ethical Committee (IEC) of SRIHER before the commencement of the study (Ethical clearance number: IEC/19/JUN/151/39) and the study was registered in the Clinical Trial Registry-India (CTRI/2019/07/020102). Written informed consent was obtained from the parents and the study was conducted according to the 2018 amendment of the International Conference on Harmonization Good Clinical Practice (ICH-GCP) guidelines.

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Ann Abraham, D., Narasimhan, U., Christy, S. et al. Effect of l-Carnosine as adjunctive therapy in the management of children with autism spectrum disorder: a randomized controlled study. Amino Acids 52, 1521–1528 (2020). https://doi.org/10.1007/s00726-020-02909-1

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