eicosapentaenoic acid and protein modulation to induce anabolism in chronic obstructive pulmonary disease (copd): aim 2

Conditions: Chronic Obstructive Pulmonary Disease; Muscle Wasting

Summary: loss of muscle protein is generally a central component of weight loss in chronic obstructive pulmonary disease (copd) patients. gains in muscle mass are difficult to achieve in copd unless specific metabolic abnormalities are targeted. the investigators recently observed that alterations in protein metabolism are present in normal weight copd patients. elevated levels of protein synthesis and breakdown rates were found in this copd group indicating that alterations are already present before muscle wasting occurs. the investigators recently observed that in order to enhance protein anabolism, manipulation of the composition of proteins and amino acids in nutrition is required in normal-weight copd. intake of casein protein resulted into significant protein anabolism in these patients. the anabolic response to casein protein was even higher than after whey protein intake. a substantial number of copd patients, underweight as well as normal weight to obese, is characterized by an increased inflammatory response. this group failed to respond to nutritional therapy. previous experimental research and clinical studies in cachectic conditions (mostly malignancy) indicate that polyunsaturated fatty acids (pufa) are able to attenuate protein degradation by improving the anabolic response to feeding and by decreasing the acute phase response. eicosapentaenoic acid (epa) (in combination with docosahexaenoic acid (dha)) has been shown to effectively inhibit weight loss in several disease states, however weight and muscle mass gain was not present or minimal. until now, limited research has been done examining muscle protein metabolism and the response to epa and dha supplementation in patients with copd. it is the investigator's hypothesis that supplementation of 2g/day epa+dha in copd patients during 4 consecutive weeks will increase the muscle anabolic response to a high quality protein supplement as compared to a placebo, and supplementation of 3.5g/day epa+dha will increase the anabolic response even further. in the present study both the acute and chronic effects of epa+dha versus a placebo on muscle and whole body protein metabolism will be examined. the principal endpoint will be the extent of stimulation of net fractional muscle protein synthesis as this is the principal mechanism by which the effect of epa+dha on muscle anabolism can be measured. the endpoint will be assessed by isotope methodology which is thought to be the reference method.

specific aim 1: to test the hypothesis that supplementation of 3.5g epa+dha will increase the acute net fractional muscle protein synthesis more in copd patients as compared to healthy controls in response to a high quality protein supplement. specific aim 2: to test the hypothesis that 3.5g/day epa+dha for 4 consecutive weeks induces a higher increase in net fractional muscle protein synthesis in response to a high quality protein supplement as compared to 2g/day epa+dha in copd patients. therefore, to answer the specific aims in this study only the copd subjects will undergo a 4-week intervention period.

Eligibility criteria:
inclusion criteria: inclusion criteria copd subjects: * ability to walk, sit down and stand up independently * age 45 years or older * ability to lay in supine or elevated position for 8 hours * diagnosis of moderate to severe chronic airflow limitation, defined as measured forced expiratory volume in one second (fev1) ≤ 70% of referen¬ce fev1 * clinically stable condition and not suffering from respiratory tract infection or exacerbation of their disease (defined as a combination of increased cough, sputum purulence, shortness of breath, systemic symptoms such as fever, and a decrease in fev1 \> 10% compared with values when clinically stable in the preceding year) at least 4 weeks prior to the study * shortness of breath on exertion * willingness and ability to comply with the protocol, including: * refraining from alcohol consumption (24 h) and intense physical activities (72h) prior to each study visit * adhering to fasting state from 10 pm ± 2h onwards the day prior to each study visit inclusion criteria healthy control subjects: * healthy male or female according to the investigator's or appointed staff's judgment * ability to walk, sit down and stand up independently * age 45 years or older * ability to lay in supine or elevated position for 8 hours * no diagnosis of copd and forced expiratory volume in one second (fev1) \> 80% of referen¬ce fev1 * willingness and ability to comply with the protocol, including: * refraining from alcohol consumption (24 h) and intense physical activities (72h) prior to each study visit * adhering to fasting state from 10 pm ± 2h onwards the day prior to each study visit exclusion criteria: * any condition that may interfere with the definition 'healthy subject' according to the investigator's judgment (for healthy control group only) * established diagnosis of malignancy * established diagnosis of diabetes mellitus * history of untreated metabolic diseases including hepatic or renal disorder * presence of acute illness or metabolically unstable chronic illness * recent myocardial infarction (less than 1 year) * any other condition according to the pi or study physicians would interfere with proper conduct of the study / safety of the patient * bmi ≥ 40 kg/m2 * dietary or lifestyle characteristics: * use of supplements containing epa+dha 3 months prior to the first test day use of protein or amino acid containing nutritional supplements within 5 days of first study day * current alcohol or drug abuse * indications related to interaction with study products: * known allergy to milk or milk products * known hypersensitivity to fish and/or shellfish, swanson efas super epa fish oil or any of its ingredients, swanson efas certified organic extra virgin olive oil or any of its ingredients * contraindications to biopsy procedure: * platelet count (plt) \< 100,000 * history of hypo- or hyper-coagulation disorders including use of a coumadin derivative, history of deep venous thrombosis (dvt), or pulmonary embolism (pe) at any point in lifetime * currently taking anti-thrombotics and cannot stop for 7 days (i.e. medical indication) * allergy to local anesthetic * use of long-term oral corticosteroids or short course of oral corticosteroids in the preceding month before enrollment * failure to give informed consent or investigator's uncertainty about the willingness or ability of the subject to comply with the protocol requirements

Keywords: protein metabolism casein protein epa fish oil