mRNA Levels of MAOA and 5-HT 2 A Receptor in Patients With Pathological Internet Use: Correlations With Comorbid Symptoms

Mimi Qiu; Chenchen Zhang; Yu Dai; Lingrui Zhang; Yang Wang; Wei Peng; Yalin Chen; Chao Wen; Hui Li; Tianmin Zhu

doi:10.3389/fpsyt.2021.667699

mRNA Levels of MAOA and 5-HT _{2 A} Receptor in Patients With Pathological Internet Use: Correlations With Comorbid Symptoms

Front Psychiatry. 2021 Jul 16:12:667699. doi: 10.3389/fpsyt.2021.667699. eCollection 2021.

Authors

Mimi Qiu¹, Chenchen Zhang², Yu Dai¹, Lingrui Zhang³, Yang Wang⁴, Wei Peng⁴, Yalin Chen¹, Chao Wen⁵, Hui Li⁶, Tianmin Zhu¹

Affiliations

¹ College of Rehabilitation and Health Preservation, Chengdu University of Traditional Chinese Medicine, Chengdu, China.
² Department of Rehabilitation, Traditional Chinese Medicine Hospital of Longquanyi District, Chengdu, China.
³ Department of Medicine, Leshan Vocational and Technical College, Leshan, China.
⁴ College of Acupuncture and Tuina, Chengdu University of Traditional Chinese Medicine, Chengdu, China.
⁵ Department of Rehabilitation, Zigong Fifth People's Hospital, Zigong, China.
⁶ College of Medicine, Chengdu University, Chengdu, China.

Abstract

Objective: Uncontrolled internet use may lead to the emergence of pathological internet use (PIU). PIU has become a global public health concern that can cause a range of psychotic symptoms, including anxiety, depression, and impulse control disorder. To date, we know very little about the principal biological factors related to PIU. Monoamine oxidase type A (MAOA) and serotonin (5-HT) 5-HT_2A receptor (5-HT_2AR) play critical roles in the development of behavioural and drug addictions. Thus, the aim of this study was to measure the relative expression of mRNA of MAOA and 5-HT_2AR in peripheral blood mononuclear cells (PBMCs) of patients with PIU and to determine the correlations between these biological indicators and the comorbid symptoms of patients with PIU. Methods: In this study, the mRNA of MAOA and 5-HT_2AR was detected using real-time PCR in PBMCs of the patients with PIU (n = 24) and healthy controls (HCs, n = 25). The relationship between the mRNA levels of MAOA and 5-HT_2AR and clinical symptoms in patients with PIU was further investigated. Results: MAOA mRNA in PBMCs was significantly upregulated in patients with PIU compared with that in HCs. mRNA levels of 5-HT_2AR were not found to differ significantly between HCs and patients with PIU. Correlation analyses further revealed a significant positive correlation between the relative expression of MAOA mRNA in PBMCs of patients with PIU and the Young's Internet Addiction Test and Self-Rating Depression Scale scores. Conclusion: The present study revealed upregulated expression of MAOA mRNA in patients with PIU and an association between the expression of MAOA mRNA and clinical symptoms of PIU, suggesting that the neurobiological changes may be similar between PIU and substance addiction. Additionally, this study demonstrated a potential association between comorbid symptoms and mRNA levels of MAOA.

Keywords: 5-HT2A receptor; comorbid symptoms; mRNA level; monoamine oxidase type A; pathological internet use.