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PubMed1992

[Should I also eat fish oils? A critical assessment of the use of fish oils in the prevention of ischemic heart disease].

The effect of a daily dietary supplement of 6 g fish oil (3.4 g eicosapentaenoic and docosahexaenoic acid) on body weight, blood pressure, bleeding time and blood lipids was assessed in an open trial. The fish oil was taken for four weeks by nine 30-55 year-old individuals. An age- and sex-matched control group took equivalent amounts of safflower oil, which has an overall fatty acid composition similar to the tested fish oil. The fish oil supplement caused significant changes in body weight (median: +0.9 kg), systolic blood pressure (-10 mmHg), diastolic blood pressure (-5 mmHg), and high density lipoprotein (HDL) cholesterol concentration (+0.21 mmol/l), whereas serum triglycerides decreased insignificantly (-0.25 mmol/l). Low density lipoprotein (LDL) concentration were not affected. We observed no changes in the control group. In the discussion, it is underlined that fish oil supplementation may affect some risk markers of ischemic heart disease favourably. However, other important risk markers, including LDL cholesterol, are unaffected or unfavourably affected by fish oils. A more uni-directional reduction in risk can be attained by a change in dietary habits, which should be preferable to a fish oil supplement in the general population. Individuals who show critically low HDL/total cholesterol ratios, who are hypertriglyceridemic, or are mildly hypertensive may, however, benefit from a fish oil supplement of the amount tested here.

Adult↗
PubMed2003

Biochemical studies on marine fish oil part-I: effects of fish oil and lipid lowering drugs on HDL/LDL cholesterol levels.

Omega-3 fatty acids present in fish oil are potent cholesterol lowering agents. This fact has drawn our attention to investigate their effects alone and in combination with competitive inhibitors, (hydrooxymethylglutaryl coenzume-A reductase). The naturally occurring omega-3 fatty acids i.e., polyunsaturated fatty acids (PUFAs), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in fish oil have been proved as anticholesterolemic agents. In order to observe their actions as lipid lowering agents, the present study has been carried out which deals with the synergistic effect of fish oil with that of Lovastatin and Gemfibrozil.

Journal Article↗
PubMedDate not supplied

Diet and fatty acids: can fish substitute for fish oil?

As fish oil has been shown to be beneficial in rheumatoid arthritis and in psoriasis, we examined whether a diet rich in fish has a similar effect on membrane and plasma lipids as a dietary fish oil supplement. Volunteers recruited by 2 rheumatology units in Switzerland formed three parallel groups eating respective diets during 2 months: a normal diet without fish; a normal diet including 700 g fish per week; a normal diet without fish but with additional fish oil (7.5 g daily). As outcome measures we determined the lipid composition of platelet-rich plasma, the serum cholesterol and triglycerides before the study and after 1 and 2 months of the designated diet. The relative amounts of both eicosapentaenoic acid and docosahexaenoic acid increased significantly in the fish oil group and in the group with the fish diet; no change was seen in the control group. The effect on triglycerides, which were low at the beginning of the study, was minor and no change in cholesterol was seen. In conclusion, 4 to 6 meals with fish per week without any other dietary changes can induce similar changes in lipids as a supplement of fish oil.

Adolescent↗
PubMed2005

Dietary olive oil supplemented with fish oil, rich in EPA and DHA (n-3) polyunsaturated fatty acids, attenuates colonic inflammation in rats with DSS-induced colitis.

Previous studies proposed a protective role of the dietary intake of (n-3) PUFA in human inflammatory bowel disease (IBD), but almost no studies have been performed using olive oil. The aims of the present study were to test the beneficial effects of an olive oil-based diet with or without fish oil, rich in (n-3) PUFA, in the dextran sodium sulfate (DSS) model of rat colitis and to elucidate the mechanisms involved in their potential beneficial effects, with special attention to the production of some of the mediators involved in the intestinal inflammatory response, such as leukotriene B(4) (LTB(4)), tumor necrosis factor alpha (TNFalpha) and nitric oxide (NO). Rats were fed the different diets for 2 wk before colitis induction and thereafter until colonic evaluation 15 d later. Colitic rats fed the olive oil-based diet had a lower colonic inflammatory response than those fed the soybean oil diet, and this beneficial effect was increased by the dietary incorporation of (n-3) PUFA. A restoration of colonic glutathione levels and lower colonic NO synthase expression occurred in all colitic rats fed an olive oil diet compared with the control colitic group that consumed the soybean oil diet. However, (n-3) PUFA incorporation into an olive oil diet significantly decreased colonic TNFalpha and LTB(4) levels compared with colitic rats that were not supplemented with fish oil. These results affirm the benefits of an olive oil diet in the management of IBD, which are further enhanced by the addition of (n-3) PUFA.

Administration, Oral↗
PubMed1996

The triglyceride lowering effect of fish oils is affected by fish consumption.

We investigated the efficacy of fish oils in Portuguese patients with hypertriglyceridaemia and mixed hyperlipidaemia, and the influence of fish consumption on the triglyceride lowering capacity of fish oils. Forty patients participated in this double-blind study, consisting of a 4-week dietary or wash-out baseline period after which patients were randomly assigned to receive either 12 fish oil capsules (3.6 g/day of omega 3) or similar 12 soya oil capsules per day for a period of 2 months. There were no statistically significant changes of total, HDL or LDL-cholesterol, and triglycerides. Nevertheless, triglycerides increased 19.9% with soya oil and decreased 27.8% with fish oils. Also, there was an inverse relationship (rho = -0.352) between fish consumption and fish oils effect on triglycerides, and the triglyceride lowering with fish oils increased (from 27.8% to 44.4%), reaching borderline significance, if we excluded patients consuming one or more meals with fish per day. Glucose increased 11% (P = 0.0047) with fish oils. These findings suggest that the triglyceride lowering effect of fish oils is affected by fish consumption, and confirm that fish oils increase blood glucose levels in diabetics and non-diabetics.

Adolescent↗
PubMed2002

A low fish oil inhibits SREBP-1 proteolytic cascade, while a high-fish-oil feeding decreases SREBP-1 mRNA in mice liver: relationship to anti-obesity.

Rodents fed fish oil showed less obesity with a reduction of triglyceride synthesis in liver, relative to other dietary oils, along with a decrease of mature form of sterol regulatory element binding protein-1 (SREBP-1) and activation of peroxisome proliferator-activated receptor alpha (PPARalpha). Decrease of mature SREBP-1 protein by fish oil feeding was due to either inhibition of SREBP-1 proteolytic cascade or to decrease of its mRNA. To clarify its mechanism and relation to antiobesity effect, mice were fed fish oil in a range from 10 to 60 energy percent (en%). Fish oil feeding decreased body weight and fat mass in a dose-dependent manner, in parallel with PPARalpha activation and a decrease of SREBP-1 mRNA. However, compared with 0 en% fish oil feeding, 10 en% fish oil feeding decreased mature SREBP-1 protein by 50% with concomitant decreases of lipogenic genes, while precursor SREBP-1 protein rather increased by 1.3-fold. These data suggest that physiological doses of fish oil feeding effectively decrease expression of liver lipogenic enzymes by inhibiting SREBP-1 proteolytic cascade, while substantial decrease of SREBP-1 expression is observed in its pharmacological doses, and that activation of PPARalpha rather than SREBP-1 decrease might be related to the antiobesity effect of fish oil feeding.

Acetyl-CoA Carboxylase↗
PubMed2006

Intestinal anti-inflammatory activity of combined quercitrin and dietary olive oil supplemented with fish oil, rich in EPA and DHA (n-3) polyunsaturated fatty acids, in rats with DSS-induced colitis.

BACKGROUND AND AIMS: Previous studies have described the intestinal anti-inflammatory effects exerted by the bioflavonoid quercitrin (QR) and by an n-3 polyunsaturated fatty acids (PUFA)-enriched diet in experimental models of rat colitis. The aim of the present study was to test if the combination of both treatments would result in an improvement in the intestinal anti-inflammatory effect achieved separately. METHODS: Colitis was induced in female Wistar rats by incorporating dextran sodium sulfate (DSS) in drinking water at 5% (w/v) for 5 days and at 2% (w/v) for the following 10 days. Five groups of rats (n=10) were used: two of them received an olive-oil-based diet with fish oil, rich in n-3 PUFA (FO diet) for 2 weeks before colitis induction and until the end of the experiment, and one of those also was administered daily QR (1mg/kg, PO), starting when DSS concentration was changed. DSS colitis was induced in other two groups fed with standard rat diet, one of them being administered QR as before. A non-colitic group fed standard diet was also included. After that period, the rats were sacrificed and colonic damage was assessed both histologically and biochemically. RESULTS: The concurrent administration of FO diet and QR exhibited an intestinal anti-inflammatory effect, as evidenced by a significant improvement of all biochemical parameters of colonic inflammation assayed in comparison with non-treated colitic rats. Thus, both colonic myeloperoxidase (MPO) and alkaline phosphatase (AP) activities were significantly reduced compared with untreated colitic rats. In addition, a complete restoration of colonic glutathione content, which was depleted as a consequence of the colonic insult, was obtained in rats treated with QR plus FO diet; this content was even higher than that obtained when colitic rats were treated with FO diet alone. When compared with the control colitic group, the combined treatment was also associated with a lower colonic nitric oxide synthase and cyclooxygenase-2 expression as well as with a significant reduction in different colonic proinflammatory mediators assayed, i.e. leukotriene B(4), tumor necrosis factor alpha and interleukin 1beta, showing a significantly greater inhibitory effect of the latter in comparison with rats receiving FO diet without the flavonoid. CONCLUSIONS: These results support the potential synergism between the administration of the flavonoid and the incorporation of olive oil and n-3 PUFA to the diet for the treatment of these intestinal inflammatory disorders.

Alkaline Phosphatase↗
PubMed2006

Fish-oil esters of plant sterols improve the lipid profile of dyslipidemic subjects more than do fish-oil or sunflower oil esters of plant sterols.

BACKGROUND: Fish-oil fatty acid esters of plant sterols (FO-PS) were shown to have hypotriglyceridemic and hypocholesterolemic properties in animal models. OBJECTIVE: The objective of the study was to evaluate the hypolipidemic effects of FO-PS supplementation in healthy hypercholesterolemic persons fed an olive oil (OO)-based diet. DESIGN: Twenty-one moderately overweight, hyperlipidemic subjects participated in a semi-randomized, single-blind, 4-period crossover study including 4 experimental isoenergetic diets of 4 wk each and 4-wk intervening washout periods. Diets contained 30% of energy as fat, of which 70% was from extra-virgin OO, and differed only in the supplement oil: OO, fish oil, FO-PS, or sunflower oil esters of plant sterols (SU-PS). Both fish oil and FO-PS provided 5.4 g total eicosapentaenoic and docosahexaenoic acids/d. FO-PS, SU-PS, and OO provided the equivalent of 1.7, 1.7, and 0.02 g free plant sterols/d, respectively. RESULTS: Fish oil and FO-PS resulted in fasting and postprandial plasma triacylglycerol concentrations that were markedly lower than those observed with OO and SU-PS (P = 0.0001), but to a different extent. LDL cholesterol was significantly lower after supplementation with FO-PS and SU-PS than at the end of the control OO diet (P = 0.0031 and 0.0407, respectively). HDL cholesterol was not affected. FO-PS and SU-PS resulted in a lower ratio of total to HDL cholesterol and lower apolipoprotein (apo) B concentrations than did OO and fish oil. The ratio of apoB to apoA was significantly lower after SU-PS consumption than after consumption of OO (P = 0.0126) and fish oil (P = 0.0292). FO-PS and SU-PS resulted in similar ratios of apoB to apoA. HDL2 and the ratio of HDL2 to HDL3 were significantly higher at the end of the FO-PS treatment than at the end of the OO (P = 0.0006), fish oil (P = 0.0036), and SU-PS (P = 0.0016) treatments. CONCLUSION: Supplementation of an OO-based diet with FO-PS may reduce cardiovascular disease risk more than does supplementation with fish oil or SU-PS.

Adult↗
PubMedDate not supplied

Dietary (n-3) fatty acids from menhaden fish oil alter plasma fatty acids and leukotriene B synthesis in healthy horses.

The study objective was to determine the effect of feeding corn oil or fish oil to horses on plasma fatty acid profiles and leukotriene B (LTB) synthesis by stimulated peripheral blood neutrophils. Two groups of horses (n = 5) were randomly assigned to diets supplemented with either 3.0% (by weight) corn oil or fish oil for a period of 14 weeks. The ratio of (n-6) to (n-3) fatty acids in oil supplements was 68.1:1 for corn oil and 0.12:1 for fish oil. Production of LTB4 and LTB, by peripheral blood neutrophils stimulated with calcium ionophore A23187 and plasma cholesterol, triacylglycerol, and alpha-tocopherol concentrations were measured. At 12 weeks, horses fed fish oil had increased plasma concentrations of eicosapentaenoic acid (27-fold; 8.5 versus 0.3 g/100 g fatty acids; P < .0001), docosahexaenoic acid (34-fold; 5.1 versus 0.1 g/100 g fatty acids; P < .0001), and arachidonic acid (8.3-fold; 4.1 versus 0.5 g/100 g fatty acids; P < .0001) compared with horses fed corn oil. Neutrophils from horses fed fish oil produced 78-fold (P = .01) more LTB5 and 9.5-fold (P = .003) more LTB4 compared with predietary levels, and 17.6-fold (P = .01) and 3.3-fold (P = .02), respectively, more than horses fed corn oil, and the ratio of LTB5 to LTB4 concentrations was 4.0-fold (P = .002) higher in horses fed fish oil. This study suggests that dietary polyunsaturated fatty acids modulate the leukotriene inflammatory response of horses. If the ratio of LTB5 to LTB4 concentrations is important in determining how inflammatory processes are mediated, then fish oil supplementation may have value in treatment of equine inflammatory diseases.

Animals↗
PubMed1992

Reduction in the ADP release from shear-stressed red blood cells by fish oil administration.

Fish oil concentrate (5.4 g/day) was administered to 8 young male volunteers and to 7 middle-aged male volunteers for 1 week. ADP released into the supernatant of red blood cell (RBC) suspension by a shear stress of 375/sec for 3 min was measured before and after fish oil administration. Before the administration the ADP release from shear-stressed RBCs in the middle-aged group was significantly higher than in the young group. After the administration the ADP release was reduced significantly in the young group (by 46%, p less than 0.001) and nonsignificantly in the middle-aged group (by 54%, p = 0.09). If the two groups were combined, the reduction was also significant (by 50%, p less than 0.005). This reduction was significantly correlated with the improvement of RBC filterability after fish oil administration (n = 13, r = 0.62, p less than 0.05). We suggest that the reduction of the ADP release from shear-stressed RBCs is one of the mechanisms of action of eicosapentaenoic acid against thrombotic disease.

Adenosine Diphosphate↗
PubMed1993

Effects on fibrinolytic activity of corn oil and a fish oil preparation enriched with omega-3-polyunsaturated fatty acids in a long-term study.

In addition to their beneficial effects in reducing platelet responsiveness, it has been a matter of controversy whether polyunsaturated fatty acids impair the fibrinolytic system or not. In a double-blind, parallel clinical trial, 40 subjects were randomized to treatment with 6 g/day of corn oil, or to 6 g/day of a fish oil preparation, enriched with omega-3-polyunsaturated fatty acids (2.0 g/day of omega-3-PUFA). Clinical and fibrinolytic variables were measured before and after 5 months of treatment. In the corn oil group, plasminogen activator inhibitor (PAI-1) decreased significantly but in the cod liver oil group, PAI-1 remained unchanged. Activities and mass concentrations of tissue plasminogen activator (t-PA) were unchanged in both groups. It is concluded that, in the doses given here, both these preparations have small or no effects on the fibrinolytic system.

Adult↗
PubMed1994

Association of etretinate and fish oil in psoriasis therapy. Inhibition of hypertriglyceridemia resulting from retinoid therapy after fish oil supplementation.

We studied the main papers concerning treatment with fish oil (EPA and DHA) of patients with psoriasis vulgaris, psoriatic arthritis and pustular psoriasis. In our investigation, 25 patients with psoriasis vulgaris evidenced a statistically significant increase in triglyceride serum levels, compared with controls. 10 of these patients underwent therapy with etretinate 0.75-1.0 mg/kg daily for 2 months followed by 2-3 months of etretinate 0.35-0.50 mg/kg daily associated with fish oil 1.5 g (EPA and DHA) daily. According with several authors, fish oil is able not only to produce good clinical results, but also to minimize the side effects of retinoid therapy, especially hypertriglyceridemia.

Adult↗
PubMed1987

Lipoprotein lipases, lipoproteins and tissue lipids in rats fed fish oil or coconut oil.

The effect of fish oil and coconut oil on plasma lipoproteins and lipoprotein-catabolizing enzymes [lipoprotein lipase (LPL) and hepatic endothelial lipase (HL)] was studied in rats. Male rats were fed for 4 wk purified diets containing equienergetic, amounts of either coconut oil (group A), coconut oil:fish oil, 50:50 (group B) or fish oil (group C). Whole plasma triacylglycerol, cholesterol and phospholipid concentrations were appreciably lower in group C than in group A, mainly due to a fall in very low density lipoprotein (VLDL) and subgroup 2 of high density lipoprotein (HDL2), with less consistent changes in LDL and HDL3. VLDL components of group B were also considerably lower than corresponding ones in group A. LPL and HL activities were about 50% lower in groups B and C than in group A. Increased hepatic triacylglycerol and cholesterol concentrations were observed in groups B and C. It is suggested that the decrease in LPL and HL activity of fish oil-fed rats may be an adaptive response to the low concentration of the substrate (triacylglycerols) for these enzymes.

Animals↗
PubMed1997

Dietary fish oil alters specific and inflammatory immune responses in chicks.

Two experiments were designed to determine the effects of dietary (n-3) fatty acids and grain source on the growth-suppressive effects of the inflammatory response and indices of specific immunity. In Experiment 1, chicks were fed diets containing 0.5, 1, or 2 g/100 g of either corn oil or fish oil. In Experiment 2, chicks were fed diets containing up to 2 g/100 g of either fish oil, linseed oil or corn oil as the source of dietary fat, in either cereal grain- or corn-based diets. In each experiment, subsets of chicks within each dietary treatment were either vaccinated with infectious bronchitis virus (IBV) vaccine, injected with Salmonella typhimurium lipopolysaccharide (LPS), heat-killed Staphylococcus aureus, or remained noninjected. Increasing dietary fish oil, but not corn oil increased body weight and lessened the growth-suppressing effect of heat-killed S. aureus or S. typhimurium LPS. Increasing the concentration of dietary fish oil decreased febrile response, circulating hemopexin and metallothionein concentrations. Dietary fish oil resulted in decreased release relative to dietary corn oil of interleukin-1 by peritoneal macrophages. Although IBV titers were not significantly affected by dietary oil treatment, phytohemagglutination-induced wattle swelling was greater among chicks fed fish oil. In Experiment 2, the modulating effects of fish oil on the immune system were dependent on the type of grain used in the diet, with fish oil/cereal diets resulting in greater cell-mediated immunity and lower indices of inflammation than fish oil/corn diets. Inclusion of increasing amounts of fish oil in the diet improved performance, decreased indices of the inflammatory response and either improved or did not change indices of the specific immune response of growing chicks.

Animals↗
PubMed2001

Comparative effects of fish oil given by gavage and fish oil-enriched diet on leukocytes.

The comparative effects of fish oil given by gavage and fish oil enriched diet on metabolism and function of lymphocytes and macrophages were investigated. For this purpose, the following parameters were examined: 1) phagocytosis capacity, production of superoxide (O2*-) and hydrogen peroxide (H2O2) by macrophages, 2) lymphocytes proliferation capacity, 3) antioxidant enzyme activities in the mesenteric lymph nodes (MEN) and liver, 4) Thiobarbituric Acid Reactive Substances (TBARS) content in MLN, liver, and plasma, 5) total antioxidant capacity of the plasma, and 6) fatty acid composition of macrophages, MLN, liver and plasma. Both FO treatments did not affect phagocytosis capacity but increased hydrogen peroxide production by macrophages in the presence of PMA. FO given by gavage markedly increased lymphocytes proliferation both in the absence (5.8-fold) and in the presence (16.7-fold) of Con A, whereas FO-rich diet showed an increase in the presence of Con A only (53.3%). FO given by gavage raised the proliferation index by 2.9-fold and FO-rich diet increased by 29% only as compared to controls. Concomitantly, FO given by gavage was more effective to increase TBARS content in plasma. The proportion of some fatty acids in the tissues and cells was also differently changed depending on the way FO was administered to rats: in particular: myristic, arachidonic, and eicosapentaenoic acids. This fact may partially explain the differences between both FO treatments.

Animals↗
PubMed1997

Dietary fish oil or lofrin, a 5-lipoxygenase inhibitor, decrease the growth-suppressing effects of coccidiosis in broiler chicks.

Broiler chicks were fed a diet containing 4% of either corn oil or fish oil from 3 to 14 d of age. From Days 15 to 23, half of the chicks in each dietary treatment were fed Lofrin (an experimental 5-lipoxygenase inhibitor) at 33 micrograms/kg feed. The remaining chicks within each dietary treatment were the untreated controls. At 24 d of age, half of the chicks within each diet-Lofrin treatment group were each infected with 4.6 x 10(4) sporulated Eimeria tenella oocysts, resulting in a 2 x 2 x 2 factorial arrangement of treatments. Body weight gain, feed consumption, and feed conversion efficiency were determined throughout the study. At 27 d of age, blood, liver, and ceca were sampled. Plasma tumor necrosis factor and hemopexin, hepatic fatty acid composition, and cecal inflammatory cell infiltration were determined. Liver fatty acid composition tended to reflect that of the diet. Chicks fed fish oil had livers that were enriched in (n-3) polyunsaturated fatty acids (PUFA) at the expense of (n-6) PUFA. Chicks fed fish oil gained body weight more rapidly than those fed corn oil. Infection of chicks with Eimeria decreased body weight gain of chicks fed corn oil, but not of chicks fed fish oil. The addition of Lofrin to the corn oil diets abrogated the growth-suppressing effects of infection, although there was no Lofrin effect among chicks fed fish oil. There was a diet by Lofrin interaction in which Lofrin treatment of birds fed corn oil decreased feed consumption and increased feed conversion efficiency, but had no effect on chicks fed diets containing fish oil. Plasma hemopexin was greater, but tumor necrosis factor was lower, in chicks fed fish oil than in chicks fed corn oil. Eimeria infection significantly increased cecal inflammatory cell infiltration across all dietary treatments. There were no clear relationships between growth rate or efficiency and the severity of the inflammatory response to Eimeria infection, as indicated by hemopexin levels and cecal inflammatory scores. These results indicate that Lofrin or fish oil, both of which modify eicosanoid metabolism, attenuate the growth-depressing effects of an Eimeria tenella infection.

Aging↗
PubMed2001

Dietary fish oil increases CD8+ T-cells and decreases autoreactive T-cell activity in autoimmune NZB/W F1 mice.

To further elucidate the effect of different dietary fats on the pathogenesis of autoimmune diseases, five groups of New Zealand black/white (NZB/W) F1 mice were fed diets containing 200 g of different dietary fats including palm oil, lard-soybean oil (1:1, w/w), soybean oil, canola oil or fish oil. Serum levels of anti-DNA antibodies, proteinuria were followed every month and life span of the mice was determined. After 5 months of the respective diets, mice were killed at the age of 7 months and phenotypic analysis of splenic cells and peritoneal resident cells was performed. The pattern of production of cytokines in splenic T-cells was also investigated. The peritoneal resident cells were isolated for measurement of prostaglandin E2 (PGE2) levels. Significantly lower immunoglobulin G (IgG) anti-single-stranded DNA (ssDNA) and anti-double-stranded DNA (dsDNA) antibody levels were associated with less severe proteinuria and prolonged life span in mice fed dietary fish oil compared to mice fed other dietary oils. Phenotypic analysis of spleen cells showed increased CD8+ T-cells in the mice fed dietary fish oil compared to mice of the other dietary groups, and the percentage of natural killer (NK) cells in the mice fed dietary fish oil was also higher compared to the other dietary groups. The peritoneal resident cells produced lower PGE2 in mice fed fish oil compared to mice in the other dietary groups. To further investigate the effect of fish oil on autoreactive T-cells, splenic T-cells purified using a nylon wool column were stimulated with non-T-cells of young NZB/W F1 mice. Our data suggest that the anti-DNA antibody augmentation ability of T-cells in mice fed dietary fish oil was significantly decreased compared to mice in the other dietary groups. These data indicate that dietary fish oil might maintain the existence of CD8+ T-cells, decrease autoreactive T-cell activity and alleviate subsequent autoimmune processes in autoimmune prone NZB/W F1 mice.

Animals↗