Sphingosine-1-phosphate: distribution, metabolism and role in the regulation of cellular functions.

The role of sphingosine-1-phosphate (S1P) in regulation of cellular functions and cell protection is reviewed. S1P, along with other sphingolipid metabolites, is believed to act as an intracellular second messenger and as an extracellular mediator molecule. S1P chemistry, production and metabolism are described.

Variation in the HIF1A gene in elite rowers.

The transcription factor hypoxia-inducible factor 1 (HIF1) is one of the key regulators of cellular metabolism. The aim of this study was to analyze the possible importance of the HIF1A Pro582Ser polymorphisms in rowing. One hundred twenty-seven male Polish rowers (both former and current competitors) were recruited for this study.

A 7-d exercise program increases high-molecular weight adiponectin in obese adults.

Purpose: High-molecular weight (HMW) adiponectin is the biologically active form of adiponectin and is related to enhanced insulin sensitivity and metabolic function. Previously, we found that 7 d of exercise improves insulin sensitivity in obese subjects; however, whether short-term exercise training affects HMW adiponectin in obese persons is unknown.

Methods: We examined the effect of seven consecutive days of supervised vigorous exercise (60 min · d(-1), 85% HRmax) on HMW adiponectin and leptin secretion in 17 obese individuals (age = 55 ± 3 yr; body mass index = 33.

Nonalcoholic fatty liver disease: biochemical and therapeutic considerations.

Nonalcoholic fatty liver disease (NAFLD) is a rapidly emerging chronic liver disease and is reported to affect up to 70-80% of overweight and obese individuals. NAFLD represents a spectrum of liver diseases that range from simple hepatic steatosis, to a more severe and treatment resistant stage that features steatosis plus inflammation, termed nonalcoholic steatohepatitis (NASH), which may in turn progress to hepatic fibrosis, cirrhosis, and sub-acute liver failure. Thus, NAFLD and its subsequent complications create a significant health burden, and currently there is no effective treatment strategy.

The effects of nicotine on the metabolic and hormonal responses during acute cold exposure.

Objective: To examine the effects of nicotine on the metabolic and hormonal responses during acute cold exposure.

Methods: Participants in this study included 6 men and 5 women between the ages of 19 and 25 years. Each subject performed 2 cold-air trials (CATs) consisting of a 30-minute baseline (BASE) period and a 120-minute exposure to 10 degree C air.