Advances in Therapy

, Volume 26, Issue 9, pp 886–892

Melatonin and tryptophan circadian profiles in patients with advanced non-small cell lung cancer

Original Research

DOI: 10.1007/s12325-009-0068-8

Cite this article as:
Hu, S., Shen, G., Yin, S. et al. Adv Therapy (2009) 26: 886. doi:10.1007/s12325-009-0068-8

Abstract

Introduction

Accumulating studies indicate that melatonin is a natural oncostatic agent capable of mediating the influence of the psychoneuroendocrine system on cancer growth. Although there is increasing evidence to show that the pineal gland may play a role in human non-small cell lung cancer (NSCLC), there is uncertainty about circadian profiles of melatonin, its precursor tryptophan, and its major metabolite, 6-sulfatoxymelatonin (6-OH-MLT) in NSCLC patients before and after treatment with standard chemotherapy (cisplatin plus vinorelbine). The aim of this study was to investigate the concentration changes of melatonin, tryptophan, and 6-OH-MLT in NSCLC patients treated with standard chemotherapy.

Methods

We examined the circadian melatonin, tryptophan, and 6-OH-MLT rhythms in 30 patients suffering from advanced-stage NSCLC and compared them with those of 63 healthy volunteers free from neoplastic disease. Blood samples were collected at 12 noon and 12 midnight. Urine samples were collected at 7 am and 4 pm. The levels of melatonin in serum and of 6-OH-MLT in urine were measured by high-performance liquid chromatography. The concentration of amino acids including tryptophan in serum was measured by amino acid analyzer.

Results

Melatonin, tryptophan, and 6-OH-MLT concentrations were significantly lower in cancer patients, in comparison with healthy subjects. A significant inverse correlation between melatonin and tryptophan was observed. Additionally, after three cycles of standard chemotherapy, there was a tendency of melatonin, tryptophan, and 6-OH-MLT concentrations to progressively decrease in NSCLC patients.

Conclusion

The results of the present study indicate that the presence of NSCLC influences the metabolism of melatonin, and chemotherapy in NSCLC patients may progressively decrease the production of melatonin.

Keywords

6-sulfatoxymelatonincircadian rhythmmelatoninnon-small cell lung cancertryptophan

Copyright information

© Springer Healthcare Communications 2009

Authors and Affiliations

  • Shilian Hu
    • 1
  • Gan Shen
    • 1
  • Shi Yin
    • 1
  • Weiping Xu
    • 1
  • Bing Hu
    • 2
  1. 1.Department of Geriatrics, Anhui Evidence-Based Medicine Center, Anhui Geriatrics InstituteThe Affiliated Provincial Hospital of Anhui Medical UniversityHefeiChina
  2. 2.Department of OncologyThe Affiliated Provincial Hospital of Anhui Medical UniversityHefeiChina