Featured Research

from universities, journals, and other organizations

Polymorphisms Of The Interleukin-1 Gene Complex May Influence Alcohol Dependence

Date:
October 13, 2009
Source:
Alcoholism: Clinical & Experimental Research
Summary:
Cytokines are small proteins secreted by cells that serve as molecular messengers between cells. Pro-inflammatory cytokines -- which function in the immune system -- may be involved in alcohol dependence. A study of three polymorphisms of the interleukin-1 gene complex (IL-1) and one of the tumor necrosis factor-alpha has found that IL-1 may directly contribute to AD among Spanish Caucasian males.

Cytokines are small proteins secreted by cells that serve as molecular messengers between cells. Pro-inflammatory cytokines – which function in the immune system – may be involved in alcohol dependence (AD). A study of three polymorphisms of the interleukin-1 gene complex (IL-1) and one of the tumor necrosis factor-alpha (TNFα) has found that IL-1 may directly contribute to AD among Spanish Caucasian males.

"Cytokines are proteins which mediate and regulate the inflammatory reaction in infectious and autoimmune diseases," explained Pilar A. Sáiz, associate professor of psychiatry at the University of Oviedo, Spain and corresponding author for the study. "Clinical observation of increased circulating levels of pro-inflammatory cytokines such as IL-1 and TNFα in patients with alcohol liver disease suggests that they might play a role on the pathogenesis of the disease. Additionally, these cytokines act in the central nervous system affecting the functionality of the serotoninergic and dopaminergic systems, which have been also related to the pathophysiology of AD, and with the brain reward systems involved in alcohol reinforcement."

Sáiz and her colleagues recruited 200 (169 males, 31 females) AD patients from an outpatient detoxification unit, as well as 420 (216 males, 204 females) healthy individuals without a history of drug/alcohol/psychiatric problems (known as "controls"), from the north of Spain. All of the Spanish Caucasian participants were genotyped for four polymorphisms –IL-1α -889 C/T, IL-1ß +3953 C/T, IL-1RA (86bp)n, and TNFα -308A/G – and assessed at baseline and again at six months for alcohol intake, addiction severity, and biomarkers of alcohol intake.

"We found that AD male patients and healthy control male patients differed in the genotype frequencies of the IL-1RA polymorphism owing to an excess of the A1/A1 genotype in the AD males," said Sáiz. "On the other hand, analysis of the IL-1 gene complex revealed a higher frequency of the IL-1a -889C / IL-1b +3953C / IL-1RA A2 haplotype in the control group than among the AD patients, as well as in the abstainers after six months of follow-up compared to the nonabstinent patients."

A haplotype is a combination of alleles at multiple loci that are transmitted together on the same chromosome, Sáiz explained. Prior research has suggested that the study of single polymorphisms may miss more complex haplotype effects, she added.

"In short, this haplotype seemed to exert a protective effect and was related to better outcomes," said Sáiz. "These findings provide further tentative evidence of the role of the IL-1 gene complex in AD as well as evidence that the nature of the associations may be direct, gender-specific, or involve haplotype effects."

She cautioned readers to remember, however, that AD is influenced by both genetic and environmental factors. "We are talking about a multifactorial polygenic disorder caused by a combination of small variations in different genes, often in concert with environmental factors," she said. "In spite of great efforts, the exact genes related to the pathophysiology of alcoholism are yet unknown. Our work represents a small piece of the puzzle."

Co-authors of the ACER paper were: Maria P. Garcia-Portilla, Eva M. Díaz and Julio Bobes of the Department of Psychiatry in the School of Medicine at the University of Oviedo, Spain; Gerardo Florez of the Unidad de Conductas Adictivas at the Hospital Santa María Nai, Spain; Paul Corcoran of the Department of Psychiatry in the School of Medicine at the University of Oviedo, and the National Suicide Research Foundation, Ireland; Celso Arango of the Unidad de Adolescentes in the Department of Psychiatry at the Hospital General Universitario Gregorio Marańon, Spain; Blanca Morales, Victoria Alvarez and Eliecer Coto of the Laboratory of Molecular Genetics at the Hospital Universitario Central de Asturias, Spain; Juan C. Leza of the Department of Pharmacology in the School of Medicine at the Complutense University of Madrid; and Sandra Alvarez and Luis Nogueiras of the Unidad Asistencial "As Burgas," Spain. The study was funded by the Instituto de Salud Carlos III of the Centro de Investigacion Biomedica en Red de Salud Mental (CIBERSAM). 


Story Source:

The above story is based on materials provided by Alcoholism: Clinical & Experimental Research. Note: Materials may be edited for content and length.


Journal Reference:

  1. Polymorphisms of the IL-1 Gene Complex are Associated with Alcohol Dependence in Spanish Caucasians, Data from an Association Study. Alcoholism: Clinical & Experimental Research, December, 2009

Cite This Page:

Alcoholism: Clinical & Experimental Research. "Polymorphisms Of The Interleukin-1 Gene Complex May Influence Alcohol Dependence." ScienceDaily. ScienceDaily, 13 October 2009. <www.sciencedaily.com/releases/2009/09/090918181448.htm>.
Alcoholism: Clinical & Experimental Research. (2009, October 13). Polymorphisms Of The Interleukin-1 Gene Complex May Influence Alcohol Dependence. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2009/09/090918181448.htm
Alcoholism: Clinical & Experimental Research. "Polymorphisms Of The Interleukin-1 Gene Complex May Influence Alcohol Dependence." ScienceDaily. www.sciencedaily.com/releases/2009/09/090918181448.htm (accessed July 31, 2014).

Share This




More Mind & Brain News

Thursday, July 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Dieting At A Young Age Might Lead To Harmful Health Habits

Dieting At A Young Age Might Lead To Harmful Health Habits

Newsy (July 30, 2014) — Researchers say women who diet at a young age are at greater risk of developing harmful health habits, including eating disorders and alcohol abuse. Video provided by Newsy
Powered by NewsLook.com
It's Not Just Facebook: OKCupid Experiments With Users Too

It's Not Just Facebook: OKCupid Experiments With Users Too

Newsy (July 29, 2014) — If you've been looking for love online, there's a chance somebody has been looking at how you're looking. Video provided by Newsy
Powered by NewsLook.com
How Your Face Can Leave A Good Or Bad First Impression

How Your Face Can Leave A Good Or Bad First Impression

Newsy (July 29, 2014) — Researchers have found certain facial features can make us seem more attractive or trustworthy. Video provided by Newsy
Powered by NewsLook.com
Losing Sleep Leaves You Vulnerable To 'False Memories'

Losing Sleep Leaves You Vulnerable To 'False Memories'

Newsy (July 27, 2014) — A new study shows sleep deprivation can make it harder for people to remember specific details of an event. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



      Save/Print:
      Share:  

      Free Subscriptions


      Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

      Get Social & Mobile


      Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

      Have Feedback?


      Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
      Mobile iPhone Android Web
      Follow Facebook Twitter Google+
      Subscribe RSS Feeds Email Newsletters
      Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins