Changes in Body Weight and Lipid Profile of Mice Treated with Sodium Butyrate and Metformin.
Previous animal studies have shown that butyrate (sodium butyrate, NaB) administration can protect against diet-induced obesity. We investigated the effect of oral (1g/kg body weight/day) and intraperitoneal (0.5/kg body weight/day) administration of NaB on body weight and lipid profile of mice. Oral (400mg/kg body weight/day) and intraperitoneal (200mg/kg body weight/day) metformin was similarly administered as positive control. Placebo was the drug vehicle (phosphate saline buffer). Fifty seven mice (15 -18 weeks old) were divided into three groups and administered freshly prepared NaB (n=19), metformin (n=16) and placebo (n=16), respectively for 16 days. Within each group half the mice were given the drug orally and half intraperitoneally. Weights were recorded daily and serum lipids were measured from blood samples obtained at the end of the study.
Both oral (p=0.001) and intraperitoneal (p<0.001) metformin caused significant weight loss (7.56+-2.47% and 8.72+-2.75%, respectively) compared to placebo. Oral NaB also caused significant weight loss (4.77+-3.49%) in mice as compared to placebo (1.81+-2.89%) at p=0.04. However, there was no significant difference in weight change between intraperitoneal NaB (4.08+-2.65%) and placebo (4.78+-2.23%) at p=0.85. Additionally serum lipids were raised in all groups with significant weight loss. The most prominent change was elevated triglycerides (214.42+-81.96 mg/dL) in NaB treated mice (p-0.01) and raised cholesterol (189.01+-39.89 mg/dL at p=0.04) in metformin treated mice as compared to placebo. To conclude NaB, causes significant weight loss in mice along with raised lipids. However oral NaB seems to be more effective than intraperitoneal butyrate.
Key words: Butyrate, Metformin, Short chain fatty acids, Weight loss, Serum lipids.
Butyrate is a short chain fatty acid produced by fermentation of indigestible fiber by microbiota of the colon (Brahe et al., 2013). Many researches have hinted towards a possible relationship between these gut microbiota and obesity (Raoult, 2016; Ridaura et al., 2013; Shen et al., 2013). It is now being hypothesized that butyrate may in fact mediate the beneficial effects of microbiota on host metabolism (Brahe et al., 2013). Animal studies show that butyrate administration can improve insulin sensitivity, increase energy expenditure (Gao et al., 2009) and protect against diet-induced obesity (Lin et al., 2012). Additionally, unlike other SCFAs, butyrate has also been shown to stimulate lipolysis in adipocytes (Berndt et al., 2012).
Gao et al. (2009) have previously shown that a group of mice fed high fat diet mixed with butyrate did not gain significant weight as compared to mice fed high fat diet without butyrate. We sought to validate these findings by administering calculated doses of sodium butyrate (NaB). Moreover, we tested the effects of oral versus intraperitoneal administration which has not been done before. In addition to the placebo group we used metformin treated mice as positive controls, since effect of metformin on weight loss is well known (Brufani et al., 2013; Ravn et al., 2013; Sever et al., 2014; Yanovski and Yanovski, 2014).
Animal housing and dosing
Fifty seven (57) Swiss Webster albino mice (15-18 weeks old) were housed in the animal facility of School of Biological Sciences, University of the Punjab with a 12 h light/dark cycle and constant temperature (22-24degC).They were all fed standard diet and water. Six mice were sacrificed before start of intervention, their organs were harvested and plasma sample obtained from blood drawn by cardiac puncture. The rest of the mice (n=51) were divided into six groups and given different treatments as shown in Table I. The mice that had already been living together in groups were allowed to remain in their respective groups in order to minimize stress.
Table I.- The treatment groups.
Group # Treatment###Dose###N
1###Oral NaB###1g/kg body weight/day###11
2###i.p. NaB###500 mg/kg body weight/day###8
3###Oral Metformin###400mg/kg body weight/day###8
4###i.p. metformin###200mg/kg body weight/day###8
5###Oral Placebo (PBS)###100 uL/day###8
6###i.p. Placebo (PBS)###100 uL/day###8
All animals were weighed daily in a plastic beaker placed on a top-loading balance. Fresh doses of oral and intraperitoneal NaB, metformin and placebo were prepared daily based on the body weights of the animals as shown in Table I. The drugs were dissolved in phosphate saline buffer (PBS) and sterilized by using syringe nano-filters. Placebo was 100 ul PBS buffer. The volume on administered dose varied between 70 and 120 ul for the drugs. In order to make oral doses more palatable and ensure accurate dosing approximately 150 mg of glucose was added to each 1000 to 1200 ul of drug preparation for all groups. The final glucose concentration varied between 0.15 to 0.12 mg/uL. Pure metformin powder was provided by Merck, Pakistan and sodium butyrate (NaB) of pharmaceutical grade was purchased from Santa Cruz Biotech. The chemicals were stored at -80 degree Celsius and their aliquots were stored at -20degC.
Animal dissection and acquiring samples
The mice were all sacrificed in fasting state after the 17th day. Animals were anesthetized using ketamine 100 mg/kg of body weight and Xylazine (about 80uL of intra-peritoneal injection for each mouse). After the mice were unconscious, blood was drawn via intra cardiac puncture. An average of 1 ml of blood was obtained from each mouse. Plasma was separated from blood after centrifugation at 4000 rpm for 4 min. The mice were decapitated before internal organs were dissected out and snap frozen for future genetic and protein expression studies.
Determining plasma lipids
Plasma total cholesterol and triglyceride levels were spectrophotometrically determined using commercially available kits (Analyticon Biotechnologies AG, 4046 and 5052, respectively). For the estimation of high-density lipoprotein cholesterol (HDL-C), other lipoprotein fractions were precipitated using HDL-C precipitation reagent (Analyticon Biotechnologies AG, 410). HDL-C was then estimated using aforementioned Analyticon kit (4046) for cholesterol estimation. For estimation of low- density lipoprotein cholesterol (LDL-C) we used recently described method by Martin et al. (2013).
During the course of the sixteen (16) days of intervention all groups of mice lost weight. The two leanest mice from the intraperitoneal metformin group died after receiving 2 doses. The difference in absolute weight from day 0 to day 16 was statistically significant in all groups except oral placebo group (Fig. 1).
Table II.- Total body weight loss (%, Mean+-SD) of Swiss Webstar albino mice after administration of sodium butyrate and metformin.
Treatment group###Butyrate###Metformin###Placebo###Adjusted R2
Oral administration###4.77+-3.49 (n=11)###7.56+-2.47 (n=8)###1.81+-2.89 (n=8)###0.32
Intraperitoneal administration###4.08+-2.65 (n=8)###8.72+-2.75 (n=6)###4.78+-2.23 (n=8)###0.34
Oral and intraperitoneal###4.48+-3.09 (n=19)###8.06+-2.56 (n=14)###3.29+-2.93 (n=16)###0.29
Table III.- Differences in weight loss adjusting for initial differences in weights (ANOVA).
###Statistics###Corrected###Intercept###Effect of initial###Treatment
###Partial Eta Squared###0.53###0.35###0.25###0.49
###Partial Eta Squared###0.41###0.01###0.02###0.4
Oral NaB Group lost 1.79+-1.15 g (p<0.001), intraperitoneal NaB group lost 1.53+-0.99 g (p=0.003), oral metformin group lost 3.07+-0.89 g (p<0.001), intraperitoneal metformin group lost 3.26+-1.10 g (p=0.001) and intraperitoneal placebo group lost 2.04+-0.99 g (p=0.001). Oral placebo group did not lose significant average weight (0.63+-0.99 g at p=0.11). However, when compared against their respective placebo groups (Table II), it was evident that mice from intraperitoneal metformin group lost most weight (8.72+-2.75% at p<0.001), followed by oral metformin group (7.56+-2.47% at poral metformin group (7.6+-2.5%) when compared with their respective placebo groups (weight losses of 4.8+-2.2 in intraperitoneal and 1.8+-2.9% in oral placebo group respectively). This difference may even have been underestimated since the two leanest mice of the intra-peritoneal metformin group expired on the 2nd and the 4th day. Oral NaB however produced a significantly greater weight loss than intra peritoneal group. The oral NaB mice lost 4.6+-3.5% weight versus the oral placebo group (1.8+-2.9%) at p=0.057 as compared to intraperitoneal NaB in which there was no significant weight loss (4.1+-2.7%) compared to its placebo group (4.8+-2.2%) at p=0.85. A recent study (Berndt et al., 2012) has shown a conspicuously different responses of oral versus intraperitoneal butyrate on chemically induced colitis in mice.
Oral butyrate exacerbated the colitis and up- regulated IL23 expression by colonic dendritic cells whereas intraperitoneal administration attenuated the colitis. Although the context is different, this finding does underline the complexity of butyrate's mechanism of action. Further studies are required to look into the mechanism of action of oral versus systemically introduced butyrate. In our case we noticed weight loss in case of oral but not in case of intraperitoneal NaB.
There are several aspects to consider when looking at effects produced by oral and intraperitoneal butyrate. The beneficial metabolic effects of orally administered butyrate may occur by several mechanisms. First it may alter gut microbiota as hinted by some animal studies (Castillo et al., 2006; Galfi and Bokori, 1990; Van Immerseel et al., 2004). Second oral NaB may improve the intestinal barrier function by nourishing the colonocytes (Meijer et al., 2010), increasing the expression of epithelial tight junctions (Ma et al., 2012; Peng et al., 2009) and mucins (Gaudier et al., 2004) in the colon. This enhanced intestinal barrier is likely to reduce metabolic endotoxemia which is linked to obesity and metabolic syndrome (Moreno-Navarrete et al., 2012).Third, it may reduce intestinal secretion of chylomicron and very low-density lipoproteins (Marcil et al., 2002, 2003).
Finally the differences may arrive from actions of NaB via the liver versus direct actions on peripheral tissues. Orally administered butyrate is transported directly to the liver where it may exert its major metabolic effects. Very little appears in the systemic circulation (van der Beek et al., 2015). In contrast intraperitoneal route is more likely to give NaB more access to peripheral adipose tissue, skeletal muscles and relatively less exposure to the liver.
Oral NaB butyrate given for 16 days caused significant weight loss in mice along with raised serum lipids. Such a trend was not observed with intraperitoneal route of administration. In comparison metformin therapy produced weight loss and raised lipids when given orally and intraperitoneally.
Statement of conflict of interest
The authors have no conflicts of interest to declare.
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|Author:||Masud, Faisal; Shakoori, Tania A.; Khawaja, Khadija Irfan; Ali, Muhammad (American boxer); Ameer, Fa|
|Publication:||Pakistan Journal of Zoology|
|Date:||Oct 31, 2016|
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