Lactobacillus plantarum PS128 Ameliorated Visceral Hypersensitivity in Rats Through the Gut–Brain Axis

  • Yen-Wenn Liu
  • Yen-Po Wang
  • Hsu-Fang Yen
  • Pei-Yi Liu
  • Wen-Jian Tzeng
  • Chia-Fen Tsai
  • Han-Chieh Lin
  • Fa-Yauh Lee
  • One-Jang Jeng
  • Ching-Liang LuEmail author
  • Ying-Chieh TsaiEmail author


Irritable bowel syndrome (IBS) is a common functional gastrointestinal disorder characterized by abdominal pain and alterations in bowel habits. Current treatments for IBS are unsatisfactory due to its multifactorial pathogenesis involving the microbiota–gut–brain axis. Lactobacillus plantarum PS128 (PS128) was reported to exhibit neuromodulatory activity which may be beneficial for improving IBS. This study aimed to investigate the effect of PS128 on visceral hypersensitivity (VH) and the gut–brain axis using a 5-hydroxytryptophan (5-HTP)-induced VH rat model without colonic inflammation induction, mimicking the characteristics of IBS. Male Sprague–Dawley rats were administered with PS128 (109 CFU in 0.2 mL saline/rat/day) or saline (0.2 mL saline/rat/day) for 14 days. Colorectal distension (CRD) with simultaneous electromyography recording was performed 30 min before and 30 min after the 5-HTP injection. Levels of neuropeptides and neurotrophins were analyzed. PS128 significantly reduced VH induced by the 5-HTP injection and CRD. Neurotransmitter protein levels, substance P, CGRP, BDNF, and NGF, were decreased in the dorsal root ganglion but increased in the spinal cord in response to the 5-HTP injection; PS128 reversed these changes. The hypothalamic–pituitary–adrenal axis was modulated by PS128 with decreased corticosterone concentration in serum and the expression of mineralocorticoid receptors in the amygdala. Oral administration of PS128 inhibited 5-HTP-induced VH during CRD. The ameliorative effect on VH suggests the potential application of PS128 for IBS.


Irritable bowel syndrome (IBS) Lactobacillus plantarum PS128 (PS128) Visceral hypersensitivity (VH) 5-Hydroxytryptophan (5-HTP) Psychobiotics 


Funding Information

This research was financially supported by grants from Academic Technology Development Program of the Ministry of Economic Affairs, Republic of China (101-EC-17-A-17-S1-197; 102-EC-17-A-17-S1-197; 103-EC-17-A-17-S1-197), Ministry of Science and Technology, Republic of China (MOST-102-2313-B-010-001-MY3; MOST 107-2320-B-010-003-MY2), National Science Council (NSC 101-2314-B-010-053), and Taipei Veterans General Hospital (V104E13-001-MY2-1).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no competing interests.

Supplementary material

12602_2019_9595_MOESM1_ESM.pdf (135 kb)
ESM 1 (PDF 135 kb)


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Authors and Affiliations

  1. 1.Institute of Biochemistry and Molecular BiologyNational Yang-Ming UniversityTaipeiTaiwan
  2. 2.Microbiome Research CenterNational Yang-Ming UniversityTaipeiTaiwan
  3. 3.Endoscopy Center for Diagnosis and TreatmentTaipei Veterans General HospitalTaipeiTaiwan
  4. 4.Institute of Brain ScienceNational Yang-Ming UniversityTaipeiTaiwan
  5. 5.School of MedicineNational Yang-Ming UniversityTaipeiTaiwan
  6. 6.Department of PsychiatryTaipei Veterans General HospitalTaipeiTaiwan
  7. 7.Division of GastroenterologyTaipei Veterans General HospitalTaipeiTaiwan
  8. 8.Bened Biomedical Co., Ltd.TaipeiTaiwan

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