Dietary Betaine Research Articles

Betaine Protects Chronic Alcohol and ω‐3 PUFA‐Mediated Down‐Regulations of PON1 Gene, Serum PON1 and Homocysteine Thiolactonase Activities With Restoration of Liver GSH

Paraoxonase (PON1) is an antioxidant enzyme that prevents LDL oxidation as well as detoxifies homocysteine thiolactone (HCTL), both of which can cause atherosclerosis. Chronic alcohol (ETOH) and high omega-3 polyunsaturated fatty acids (omega-3 PUFA) consumption may affect PON1 status presumably via reactive oxygen species by depleting liver glutathione (GSH), whereas betaine may counter their effects. Therefore, we investigated the influence of ETOH, omega-3 PUFA, and betaine on liver GSH, PON1 expression, lipid score, as well as serum PON1 and HCTLase activities. Experimental rats belonging to various dietary groups were pair-fed with Lieber-DeCarli low (2.8% the dietary calories as omega3-fatty acids) and high (13.8% the dietary calories as omega3-fatty acids) menhaden fish alcohol-liquid diets with and without betaine (10 g/l diet) for 8 weeks after which liver PON1 mRNA, GSH, lipid score, and serum PON1, HCTLase, and ALT activities were measured. High omega-3 PUFA decreased liver PON1 mRNA expression, serum PON1, and HCTLase activity by 23% (p < 0.01), 20% (p < 0.05), and 28% (p < 0.05), respectively compared to the low omega-3 PUFA group. ETOH decreased PON1 mRNA expression by 25 and 30% (p < 0.01) with concomitant 27% (p < 0.05) and 38% (p < 0.01), decrease in liver GSH levels in low and high omega-3 PUFA groups, respectively. Correspondingly, serum PON1 activity decreased by 23% (p < 0.05) and 58% (p < 0.01) while serum HCTLase activity decreased by 25% (p < 0.05) and 59% (p < 0.01) in the low and high omega-3 PUFA ETOH groups, respectively. Betaine restored liver PON1 mRNA expressions in low and high omega-3 PUFA ETOH groups with parallel restorations of PON1 activity and liver GSH. Concomitantly, betaine reduced hepatosteatosis accompanied by alleviation of liver injury caused by chronic alcohol and high omega-3 PUFA. Based on these results, we conclude that dietary betaine not only atheroprotective by restoring liver GSH that quenches free radicals, but also may alleviate liver injury by reducing hepatosteatosis.

Effects of Dietary Betaine on the Secretion of Insulin-like Growth Factor-I and Insulin-like Growth Factor Binding Protein-1 and -3 in Laying Hens

The principal objective of this experiment was to determine the effects of dietary betaine on IGF-I, IGFBP-3 and IGFBP-1 secretion and IGF-I mRNA gene expression in the serum and liver of laying hens. A total of 72 ISA-Brown laying hens were fed with four different levels of betaine (0, 300, 600, 1,200 ppm) based on a corn-soybean meal diet containing 2,800 kcal/kg of metabolizable energy (ME) and 16% crude protein (CP) for four weeks. The results indicated significantly higher serum and liver IGF-I concentrations in the laying hens fed with 600 and 1,200 ppm betaine (p

Effect of Betaine on Ileal and Total Tract Digestibilities and Concentrations of Bacterial Metabolites in Piglets

Ratriyanto, A., Eklund, M., Jezierny, D. and Mosenthin, R. 2009. Effect of betaine on ileal and total tract digestibilities and concentrations of bacterial metabolites in piglets. J. Appl. Anim. Res., 36: 185–190. To investigate the effects of dietary betaine supplementation on ileal and total tract nutrient digestibilities and intestinal bacterial fermentation characteristics, 4 barrows (8.6 kg) were fitted with simple T-cannulae at the distal ileum. They were randomly allocated to a basal diet without or with 4.5 g betaine per kg assay diet (Betaine) with 4 repeated measurement periods. The betaine supplementation increased (P<0.05) ileal digestibility of dry matter by 1.2 percentage units and tended to increase ileal crude fiber (P=0.068) and glycine (P=0.057) digestibilities by 7.5 and 3.3 percentage units, respectively. Furthermore, betaine supplementation tended (P=0.117) to increase total tract crude fiber digestibility by 4.7percentage units. Moreover, dietary betaine inclusion increased ileal short-chain fatty acid and fecal diaminopimelic acid concentrations (P<0.05), which indicates intensified intestinal bacterial activity. In conclusion, dietary betaine stimulates bacterial fermentation of fiber in the small and large intestine.

Dietary betaine and choline intake are not associated with risk of epithelial ovarian cancer

Evidence suggests that nutrients involved in one-carbon metabolism are implicated in ovarian cancer etiology. No studies have evaluated the role of choline, and that of its metabolite, betaine. We prospectively examined the relationship between the intake of these nutrients and ovarian cancer risk among 159 957 participants from the Nurses' Health Study (NHS) and NHSII. The average nutrient intake was assessed every 2-4 years beginning in 1984 (for NHS) and in 1991 (for NHSII). With up to 22 years of follow-up per cohort, 526 incident cases of ovarian cancer were diagnosed. There were no associations between total choline, betaine, as well as choline plus betaine intake and ovarian cancer risk (for example, relative risk, top vs bottom quintile of choline=0.98; 95% confidence interval: 0.73-1.31; P(trend)=0.81). Results did not vary by alcohol consumption, folate intake or after the exclusion of cases diagnosed during the 4-year period after dietary assessment. These data provide little evidence for a role of these nutrients in ovarian cancer etiology.

Betaine suppresses carnitine palmitoyltransferase I in skeletal muscle but not in liver of finishing pigs

An experiment was conducted to investigate the effect of dietary betaine supplementation on the enzyme activity and mRNA abundance for carnitine palmitoyltransferase I (CPT I) in liver and skeletal muscle of finishing pigs. Forty-eight crossbred barrows and gilts [Duroc × (Seghers × Seghers)] weighing about 55 kg were divided into two dietary treatments, each with three replicates of eight pigs (four barrows and four gilts) per replicate. Pigs were fed a corn–soybean meal basal diet supplemented with betaine at 0 or 1250 mg/kg feed for 42 days. At trial termination, two pigs (one barrow and one gilt) weighing about 90 kg were selected from each replicate (six pigs per dietary treatment) and slaughtered for analyses. The results showed that intramuscular fat content in the longissimus muscle of pigs fed betaine was 23.6% higher than that of controls ( P < 0.05), whereas hepatic fat content was not affected with dietary betaine treatment. Muscle-type CPT I (M-CPT I) activity, but not liver-type CPT I (L-CPT I) activity was decreased by betaine supplementation. Furthermore, betaine supplementation reduced M-CPT I mRNA abundance by 14.6% ( P < 0.05) but did not affect L-CPT I mRNA abundance. There was a positive correlation between enzyme activity and mRNA abundance for both L-CPT I and M-CPT I ( r = 0.67 and r = 0.72 for L-CPT I and M-CPT I, respectively; P < 0.05). The study suggests that betaine may be involved in fat partitioning in pigs by reducing the activity and mRNA abundance of M-CPT I, with a resultant increase in intramuscular fat content.

The effects of dietary betaine supplementation on fatty liver performance, serum parameters, histological changes, methylation status and the mRNA expression level of Spot14α in Landes goose fatty liver

We evaluated the effects of betaine supplementation on liver weight, liver/body weight, serum parameters and morphological changes. Compared with the control and overfed groups, the geese that were fed the betaine diet showed increased liver weight and decreased abdominal adipose tissue weight compared with the overfeeding groups. Betaine treatment also significantly increased ChE, HDL, LDH and ALT levels ( P < 0.01 or P < 0.05). Decreased macrovesicular steatosis and increased microvesicular steatosis were observed in the betaine-treated group, and the lipid was well-distributed in the betaine supplement group. The expression of S14α mRNA in the livers of the betaine-treated geese was higher than that in the control or the overfed geese. We performed sodium bisulfite sequencing of the individual alleles of this region (between + 374 and − 8 base pairs relative to the transcription start site), containing 33 CpG dinucleotides. In the overfed group expressing higher S14α transcripts, the average methylation at the 33 CpGs sites was 87.9%. This contrasted with 69.6% in the control group that showed lower expression of the S14α gene ( P < 0.01). However, no significant change in methylation in the transcription start site was found between the betaine-treated geese (82.6%) and the overfed geese (87.9%). These results indicate that the DNA methylation pattern in the S14α gene transcription start site may not be related to the expression of S14α transcript in response to betaine supplementation.

Effects of Dietary Glycine Betaine on Growth and Pork Quality of Finishing Pigs

This study was carried out to compare the growth performance and quality properties of pork from finishing pigs fed different levels of betaine. A total 120 female pigs (Landrace×Yorkshire×Duroc) were fed either a control commercial diet or the control diet supplemented with 2, 4 and 6% betaine for 31 days. The average daily feed intake (ADFI) of the 2% diet was lower than of the other treatment groups. The average daily gain (ADG) for pigs fed betaine diets was significantly higher (p 0.05). Dietary supplementation with betaine decreased total cholesterol concentrations in blood, and increased saturated fatty acid and decreased unsaturated fatty acid levels in muscle. Pigs supplemented with betaine had increased betaine concentrations in the loin muscle. It was concluded that dietary betaine supplementation of finishing pigs can improve growth performance and reduce blood cholesterol concentrations. It was also concluded that dietary betaine produced detectable betaine concentrations in the lion muscle. (Key Words : Betaine, Growth Performance, Muscle Types, Betaine Concentration, Pork Quality, Pig)

Dietary and supplementary betaine: Effects on betaine and homocysteine concentrations in males

Background and aims Betaine is an osmolyte that when catabolised decreases plasma total homocysteine. A betaine-rich meal has acute effects similar to a supplement, but the effects of a longer-term increase in dietary betaine intake need clarification. We compared the effects of two weeks of dietary and supplementary betaine on plasma betaine and homocysteine concentrations both fasting and after a methionine load. Methods and results In a randomized crossover study, 8 healthy males (22–36 y) consumed either a betaine-rich diet (∼800 mg/day) or a betaine supplement (0.5 g twice daily) for 14 days. Fasting blood samples were collected on day −5, −1 (pre-treatment) 0, 2, 6, 9, 13 (treatment), 14 and 18 (post-treatment). Post-methionine load blood samples were collected on day −5, 0, 6 and 13, while 24 h urine samples were collected on day −5, 0, 6, 13 and 14. Plasma betaine, dimethylglycine, homocysteine and urine betaine, dimethylglycine and creatinine concentrations were measured. Plasma betaine concentrations significantly increased for both treatments compared to pre-treatment values ( P < 0.001). Fasting homocysteine levels were minimally affected. Both treatments reduced post-methionine load homocysteine and this effect tended to be greater following a betaine-rich diet ( P = 0.108). Small increases in urinary betaine excretion were observed following both treatments (≈1.5% of supplement; ≈1.3% of dietary betaine). Most was attributable to increased excretion of betaine as dimethylglycine. Conclusions Supplemental or dietary betaine similarly increase circulating betaine concentrations and attenuate the post-methionine load rise in homocysteine concentrations.

Dietary Betaine Affect Duodenal Histology of Broilers Challenged with a Mixed Coccidial Infection

The purpose of this research was to investigate effect of dietary betaine on intestinal morphology after an experimental coccidiosis. Hence a total of 189 male and female broiler chicks were randomly assigned to 9 floor cages. Chicks were fed a basal diet supplemented with 0, 0.6 or 1.2 g kg(-1) betaine. All birds were inoculated orally with Eimeria oocysts on day 28. Duodenal morphology parameters and lesions were scored by microscopic observation on intestine samples which were taken at day 42 of age. Adding 1.2 g kg(-1) betaine to diet diminished intestinal lesions (p < 0.05). Dietary supplementation with 0.6 or 1.2 g kg(-1) betaine significantly (p < 0.01) increased intraepithelial lymphocytes as well. Level of additive betaine had no effect on the ratio of villus height/crypt depth or villus surface area. Lamina propria of duodenum became thicker in the intestine of chickens which received more supplemental betaine via their diet. In conclusion, since the number of intraepithelial lymphocytes and thickness of lamina propria represent the condition of gut immune response, it seems that dietary betaine may immunomodulate the gastrointestinal tract of broilers. In addition, betaine effect on villus morphology measured later in life differed from what had been measured already earlier in life of the chicks.

Intestinal effects of dietary betaine in piglets.

The study was conducted to investigate the effects of graded dietary inclusion levels of betaine on ileal and total tract nutrient digestibilities and intestinal bacterial fermentation characteristics in piglets. A total of 8 barrows (BW 7.9 kg) was fitted with simple T-cannulas at the distal ileum. The animals were randomly allocated to 1 of the 4 assay diets with 2 pigs per treatment in 4 repeated measurement periods. The assay diets included a basal diet based on wheat, barley and soybean meal alone, or supplemented with a liquid betaine product at dietary levels of 1.5, 3.0, or 6.0 g betaine kg–1 diet (as–fed). Ileal digestibilities of dry matter (DM) and neutral detergent fiber (NDF) increased both quadratically and linearly (P<0.05), and ileal digestibility of glycine increased linearly as dietary betaine level increased (P<0.05). Moreover, there were linear increases in the concentrations of ileal D–lactic acid (P<0.05), indicating intensified intestinal bacterial activities as dietary betaine level increased. At the fecal level, total tract crude protein (CP) digestibility increased quadratically (P<0.05), and digestibility of amino acids (AA) tended to increase quadratically (P=0.06 to P=0.11), except for proline (P>0.05), as dietary betaine level increased. The increased bacterial degradation of CP and AA in the large intestine coincides with the linear increase (P<0.05) in fecal diaminopimelic acid concentrations, indicating enhanced intestinal bacterial growth with increasing dietary betaine levels. In most cases, there was a response in the variables that were measured up to 3.0 g betaine per kg diet, whereas increasing the betaine level from 3.0 to 6.0 g betaine per kg diet had no additional effect. It can be concluded that dietary betaine stimulates microbial fermentation of fiber in the small intestine, leaving less fermentable fiber to reach the large intestine and therefore, increased microbial degradation of protein in the large intestine may occur. Keywords: piglets, betaine, digestibility, bacterial fermentation, microflora

Dietary betaine and ractopamine combine to increase lean tissue deposition in finisher pigs, particularly gilts

Dietary ractopamine increases lean tissue deposition, with the responses most evident at ad libitum feed intakes whereas dietary betaine can improve growth by reducing maintenance requirements, with the greatest responses occurring when energy is limiting. This study was conducted to investigate the interactions between dietary ractopamine and betaine on growth and carcass characteristics in restrictively fed [31.0 MJ digestible energy (DE)/day for 14 days followed by 36.8 MJ DE/day for 21 days] boars and gilts. Forty individually penned pigs (58.4 kg) were allocated to a 2 × 2 × 2 factorial arrangement of treatments, with the respective factors being sex (gilt or boar), dietary betaine (0 and 1.5 g/kg betaine) and dietary ractopamine (0 and 10 ppm ractopamine) for 35 days. Over the first 14 days of the study when the restriction was greatest, daily gain was greater in pigs fed betaine (+8%, P = 0.04) and in boars (+12%, P = 0.005) but was not affected by ractopamine (P = 0.18). Lean deposition was greater in pigs fed betaine (+5%, P = 0.08) and in boars (+6%, P = 0.006) but was not affected by ractopamine (P = 0.57). However, there was an interaction (P = 0.03) between ractopamine and sex such that ractopamine increased lean deposition in gilts but not boars. Thus, betaine and ractopamine had additive effects on lean mass in gilts (+5.1 kg) but not boars. Fat deposition was less in pigs fed ractopamine (–8%, P = 0.05) and in boars (–17%, P &lt; 0.001) but was not affected by betaine (P = 0.81). However, there was an interaction (P = 0.04) between dietary ractopamine and sex such that ractopamine decreased fat deposition in gilts (–14%) but not boars. In conclusion, dietary betaine and ractopamine may have additive effects on lean deposition and improve body composition in gilts but responses in boars are more equivocal.

Effect of Dietary Betaine Supplementation on mRNA Expression and Promoter CpG Methylation of Lipoprotein Lipase Gene in Laying Hens

In laying hens, dietary betaine supplementation is reported to reduce abdominal fat, however, the mechanism of which remains largely unknown. The present study investigated the effect of dietary betaine supplementation on mRNA expression and the promoter CpG dinucleotide methylation profiles of chicken lipoprotein lipase (LPL) gene. The experiments were carried out with 120 laying hens which were randomly allocated to four diets supplemented with 0, 0.04, 0.06 and 0.08% betaine. The mRNA levels of LPL gene was investigated by using real-time RT-PCR. The CpG methylation profiles at LPL promoter region were analyzed by using bisulfite sequencing method. The results indicated that betaine supplementation at levels of 0.06 and 0.08% tend to decrease LPL mRNA expression in both 165-day-old and 180-day-old hens. In 180-day-old hens, two distinct CpG methylation profiles at the promoter region of chicken LPL gene were revealed: in control and 0.04% betaine groups, in which LPL mRNA expressions in abdominal adipose tissue were higher, CpG methylation occurs mainly at 1st to 8th sites, the remaining sites were less methylated; whereas in 0.06 and 0.08% betaine groups, in which LPL mRNA expressions in abdominal adipose tissue were lower, methylation levels of 1st-8th CpG sites were decreased, while those of the remaining sites increased.

Dietary factors associated with plasma high molecular weight and total adiponectin levels in apparently healthy women

Our aim was to investigate associations between dietary factors and high molecular weight (HMW) as well as total adiponectin in a sample of apparently healthy adult Mediterranean women. Two hundred and twenty women were enrolled in this study. Anthropometric and body composition measurements were performed in all subjects. Fasting blood samples were taken; HMW and total adiponectin concentrations were measured. Food intake was evaluated using 3-day food records. The frequency of consumption of several food groups was approximately quantified in terms of number of servings per day. Furthermore, dietary intakes of betaine, choline, and free choline were estimated. Women in the highest HMW adiponectin tertile had higher fruit intake compared with those with lower levels, after adjusting for potential confounders (P=0.04). On the contrary, dietary betaine and choline intakes were not different among HMW adiponectin tertiles. In linear models, fruit consumption, controlling for biological and lifestyle variables, was significantly related to HMW adiponectin (partial r=0.15, P=0.04), but the association with total adiponectin did not reach statistical significance (partial r=0.11, P=0.12). A significant negative correlation between total adiponectin and refined cereals was also observed (partial r=-0.16, P=0.03). This is the first study that evaluates associations between dietary factors and HMW adiponectin levels. The associations found are moderate and indicate that, after multivariate adjustment, fruit consumption is related to HMW adiponectin in both linear and nonlinear models.

Elevated Tissue Betaine Contents in Developing Rats Are Due to Dietary Betaine, Not to Synthesis

The time course of betaine accumulation and activities of enzymes involved in betaine metabolism were studied in developing rats. In study 1, pups weaned on a nonpurified diet had a transient increase in liver and kidney betaine content followed by a decline after ∼42–56 d. In study 2, dams and, following weaning, pups were fed an AIN-93G (betaine-free) or an AIN-93G betaine-supplemented diet (0.3%) to determine the source of the transient increase in betaine levels previously observed. In study 2, only rats fed betaine had an increase in plasma betaine concentration. Similarly, liver and kidney betaine contents increased postweaning; however, betaine levels returned to that found in rats fed a betaine-free diet by 49 d of age. The dietary content of betaine fed to dams did not affect pup betaine. The activities of choline dehydrogenase, an enzyme of betaine synthesis, and betaine:homocysteine methyltransferase (BHMT), which is the only known betaine-consuming enzyme in mammals, were also measured in study 2. Liver BHMT activity decreased after weaning, whereas liver and kidney choline dehydrogenase activity increased with age, possibly reaching a plateau by 42 d of age. We conclude that the transient increase in betaine reflects high dietary betaine and not a change in endogenous betaine synthesis.

Dietary betaine and inflammation

Dietary betaine and inflammation

M1760 Bifidobacteria Attenuate the Development of Non-Alcoholic Fatty Liver in Obese Mice

Our laboratory has previously shown that ethanol causes defects in methionine metabolism which result in higher levels of two toxic metabolites, homocysteine and S-adenosylhomocysteine (SAH). These metabolites, in turn, contribute to the development of characteristic features of alcoholic liver injury via impairments in crucial transmethylation reactions. We have further reported that dietary betaine supplementation alleviates ethanol-induced changes in intracellular SAH levels to mitigate steatosis, apoptosis and damaged protein accumulation, thereby preventing the progression to fibrosis and cirrhosis. We have data that shows that this protective effect of betaine is due to its ability to donate methyl groups to homocysteine via reactions catalyzed by the betaine homocysteine methyltransferase (BHMT) enzyme to generate methionine. In our search for alternates to betaine, we found that sulphur-containing analogs of betaine called thetins are alternative methyl-donor substrates of BHMT. The purpose of this study therefore was to compare the efficacy of betaine and one such analog, dimethylacetothetin (DMAT) in preventing alcoholic liver injury. The chronic ethanol feeding model which shows characteristic features of alcoholic liver injury after 4-5 weeks of ethanol exposure was utilized. Male Wistar rats (180-200 g BW) were fed the control or ethanol diet. Additional groups were fed the ethanol diet-supplemented with 1% betaine or 0.5% DMAT. All rats were sacrificed at the end of 4-5 weeks of feeding. Blood was collected and livers were excised and freeze-clamped and stored at -70°C until analyzed. We observed that while both compounds, betaine and DMAT, were effective in reducing fat accumulation in the liver, DMAT was more effective than betaine in preventing alcoholic steatosis (p < 0.05). Betaine supplemented as 1% in ethanol diet reduced the elevated liver triglycerides by ~50% (p < 0.05). However, DMAT at only a 0.5% supplementation reduced the liver triglycerides to levels seen in the control diet-fed animals. The blood ethanol levels were similar in ethanol-fed rats as compared to the betaine or DMAT-supplemented ethanol diet fed groups. We further showed that DMAT is a an exceptionally good substrate for BHMT, is 20 times more effective than betaine in remethylating homocysteine (p < 0.05) and also more efficacious in preventing methionine-induced hyperhomocysteinemia (p < 0.05). To conclude, DMAT should be considered as an alternative therapeutic agent to betaine for the treatment of alcoholic and non-alcoholic liver disease.

Dietary and supplementary betaine: acute effects on plasma betaine and homocysteine concentrations under standard and postmethionine load conditions in healthy male subjects

Background: Betaine comes from the diet and from choline, and it is associated with vascular disease in some patient groups. Betaine supplementation lowers plasma total homocysteine.Objective: We compared the acute effects of dietary and supplementary betaine and choline on plasma betaine and homocysteine under standard conditions and after a methionine load.Design: In a randomized crossover study, 8 healthy men (19–40 y) consumed a betaine supplement (≈500 mg), high-betaine meal (≈517 mg), choline supplement (500 mg), high-choline meal (≈564 mg), high-betaine and -choline meal (≈517 mg betaine, ≈622 mg choline), or a low-betaine and -choline control meal under standard conditions or postmethionine load. Plasma betaine, dimethylglycine, and homocysteine concentrations were measured hourly for 8 h and at 24 h after treatment.Results: Dietary and supplementary betaine raised plasma betaine concentrations relative to control (P < 0.001) under standard conditions. This was not associated with raised plasma dimethylglycine concentration, and no significant betaine appeared in the urine. A small increase in dimethylglycine excretion was observed when either betaine or choline was supplied (P = 0.011 and < 0.001). Small decreases in plasma homocysteine 6 h after ingestion under standard conditions (P ≤ 0.05) were detected after a high-betaine meal and after a high-betaine and high-choline meal. Dietary betaine and choline and betaine supplementation attenuated the increase in plasma homocysteine at both 4 and 6 h after a methionine load (P ≤ 0.001).Conclusions: Dietary betaine and supplementary betaine acutely increase plasma betaine, and they and choline attenuate the postmethionine load rise in homocysteine concentrations.

Alleviation of acute ethanol-induced liver injury and impaired metabolomics of S-containing substances by betaine supplementation

Oxidative stress is suggested to play a key role in the development of alcoholic liver injury. We investigated the induction of oxidative damage in association with changes in hepatic concentrations of sulfur-containing substances in mice challenged with binge-like ethanol administration. Also the protective effect of dietary betaine against ethanol-induced liver injury was determined. Serum alanine aminotransferase activity, TNFα level, and hepatic malondialdehyde level were increased significantly by ethanol administration. Hepatic Cyp2e1 was induced to 250% of control. Ethanol administration decreased hepatic S-adenosylmethionine, cysteine, and glutathione, but elevated hypotaurine and taurine levels. Betaine supplied in drinking water for 2 weeks attenuated the induction of alcoholic liver injury and Cyp2e1 significantly. Reduction of hepatic S-adenosylmethionine and glutathione was alleviated, and elevation of hypotaurine and taurine was depressed. The results suggest that betaine may protect the liver against ethanol-induced oxidative injury most probably via its effects on the sulfur–amino acid metabolism.

Choline metabolism and risk of breast cancer in a population‐based study

Choline is an essential nutrient required for methyl group metabolism, but its role in carcinogenesis and tumor progression is not well understood. By utilizing a population-based study of 1508 cases and 1556 controls, we investigated the associations of dietary intake of choline and two related micronutrients, methionine and betaine, and risk of breast cancer. The highest quintile of choline consumption was associated with a lower risk of breast cancer [odds ratio (OR): 0.76; 95% confidence interval (CI): 0.58-1.00] compared with the lowest quintile. Two putatively functional single nucleotide polymorphisms of choline-metabolizing genes, PEMT -774G>C (rs12325817) and CHDH +432G>T (rs12676), were also found be related to breast cancer risk. Compared with the PEMT GG genotype, the variant CC genotype was associated with an increased risk of breast cancer (OR: 1.30; 95% CI: 1.01-1.67). The CHDH minor T allele was also associated with an increased risk (OR: 1.19; 95% CI: 1.00-1.41) compared with the major G allele. The BHMT rs3733890 polymorphism was also examined but was found not to be associated with breast cancer risk. We observed a significant interaction between dietary betaine intake and the PEMT rs7926 polymorphism (P(interaction)=0.04). Our findings suggest that choline metabolism may play an important role in breast cancer etiology.

Can Exogenous Betaine Be an Effective Osmolyte in Broiler Chicks under Water Salinity Stress?

A CRD experiment was conducted to evaluate the effects of different exogenous betaine levels (0.000, 0.075, 0.150 and 0.225 percent) on 576 one-day-old male broiler chicks (Ross) under water salinity stress. Different levels of water salinity were made by adding 3 levels of NaCl (0, 1,000 and 2,000 mg/L) to drinking water. Feed and water were available ad libitum. Betaine increased body weight, improved feed conversion ratio, and decreased packed cell volume (p<0.05). Water salinity promoted body weight over the whole period, increased feed intake (11 to 21 and 29 to 42-d) and also improved feed conversion ratio in grower and finisher periods (p<0.01). Breast weight, water consumption (28-d and 42-d) and excreta moisture (28-d) were increased by elevating the level of water salinity (p<0.01). Interaction between dietary betaine and water salinity was significant on plasma osmolarity as well as epithelial osmolarity of the duodenum at 28-d. Epithelial osmolarity was decreased from duodenum to ileum. The data imply that betaine is involved in the protection of intestinal epithelia against osmotic disturbance which can be caused by saline water, but further research is needed to investigate the effects of betaine with higher levels of water salinity.