The unhealthy diet has deleterious consequences even after the fats were removed from the diet and has links to insulin production.
We know that foetal growth is influenced by the mother's nutritional status, explained Brazilian nutritionist Luciana Pisani. The nutritional conditions during pregnancy has a major role in the metabolic and hormonal interactions between the mother's body, placenta and foetus. To date only a few studies have looked at the effects on trans fatty acids during pregnancy and lactation on the metabolism of offspring in adulthood. We found that the fatty content of the babies' bodies increased when the mothers were fed the hydrogenated fat rich diet and this could be traced to the gene expression of adipokines.
In an investigation to examine whether feeding pregnant and lactating rats hydrogenised fats rich in trans fatty acids, increased the fat content in carcass, the researchers found that their metabolic rate dropped dramatically. Interestingly young rats that were fed a normal diet after they were born ate less and weighed less even though their mothers had been eating the trans fatty acids while pregnant. The gene expression of adipokines was also examined in relation to insulin production.
The offspring were weighed weekly and exposure to the trans-fatty acid enriched diet after weaning led to a 40% increase in body fat content for the young rats. Rats whose mothers were fed the trans fatty acids and continued to eat the fats into adulthood had the highest metabolic efficiency. The same rats increased their insulin production.
Pisani continued, Fats play a fundamental role in foetal development and changes in dietary fatty acids has important implications for foetal and postnatal development. Heavy ingestion of very hydrogenated fats rich in trans fatty acids increases risk of cardiovascular diseases and reduces insulin sensitivity and so leads to type 2 diabetes. We need to investigate this further as this has important implications for people's own diets, especially pregnant women.
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This vicious feed-forward cycle caused the calcium leak to further worsen, the calcium channels to become extremely heat sensitive and muscles to contract uncontrollably in response to both anesthesia and heat. Uncontrolled contractions can break apart muscle cells, releasing toxic cellular metabolites into the bloodstream that ultimately trigger kidney failure and throw the heartbeat out of rhythm. Even in the absence of such acute events, increased oxidative stress in the muscle of mutant mice over the long term was also found to distort the shape of mitochondria and weaken muscle contraction (myopathy).
Most importantly, simply including an antioxidant, N-acetylcysteine (NAC), in the animal's water supply resulted in a marked reduction in sensitivity to heat stress, improved mitochondrial health and restoration of muscle function in aged mice. NAC is currently in phase 2 human clinical trials for patients with cystic fibrosis, where disease creates free radicals that damage lung tissue.
Researchers from the Medical Center, the Baylor College of Medicine and CeSI Centro Scienze dell'Invecchiamento Universit degli Studi G in Italy collaborated on the paper. Along with Dirksen, the Rochester effort was led by Ann Rossi and Sanjeewa Goonasekera, Ph.D. in the Department of Pharmacology and Physiology. Susan L. Hamilton, Ph.D., chair of the Department of Molecular Physiology & Biophysics at Baylor, was the corresponding author. Although not authoring institutions on the current paper, the Uniform Services University of the U.S. Army and Harvard University also participated in the work through a related grant from the National Institutes of Health.
We found that destructive cycles of calcium leakage and excess free radical production damage mitochondria and contribute to the deterioration of muscle function in aged animals, Dirksen said. In successfully constructing the first mouse model of human MH, we unwittingly generated the first animal model of heat stroke that will undoubtedly be tremendously useful in better understanding these disorders and in accelerating the design of safe and effective treatments for both conditions.
Malignant hyperthermia syndrome, a potentially fatal inherited disorder, is most often triggered' by certain gas anesthetics and the paralyzing drug succinylcholine, said Henry Rosenberg, M.D., president of the Malignant Hyperthermia Society of the United States and professor of anesthesiology at Mount Sinai School of Medicine, N.Y. In the naturally occurring animal model, certain breeds of swine, the syndrome is also precipitated by environmental conditions. It has long been debated as to whether some cases of heat stroke and exercise-induced muscle breakdown in humans are related to malignant hyperthermia as well. This study defines a biochemical pathway that might very well clarify the relationship between anesthesia-induced malignant hyperthermia and heat stroke. This elegant study, using modern molecular techniques, opens new avenues for the study of the not-uncommon problem of heat stroke and exercise-induced muscle breakdown and the risk for malignant hyperthermia.
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