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Zhang J, Long X, Liao Q, Chai J, Zhang T, Chen L, He H, Yuan Y, Wan K, Wang J, Liu A. Distinct Gut Microbiome Induced by Different Feeding Regimes in Weaned Piglets. Genes (Basel) 2022; 14:49. [PMID: 36672790 PMCID: PMC9858795 DOI: 10.3390/genes14010049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 12/19/2022] [Accepted: 12/20/2022] [Indexed: 12/28/2022] Open
Abstract
It is well accepted that the gut microbiota of breast-fed (BF) and formula-fed (FF) infants are significantly different. However, there is still a limited number of studies comparing the gut microbiota of BF and FF piglets, despite increasing numbers of FF piglets in the modern pig industry. The present study identified the differences in gut microbiota composition between BF- and FF-weaned Rongchang piglets at 30 days old, using pair-end sequencing on the Illumina HiSeq 2500 platform. The BF piglets had lower microbiota diversities than FF piglets (p < 0.05), and the community structures were well clustered as a result of each feeding pattern. Firmicutes and Bacteroidetes represented the most dominant phyla, and Ruminococcus, Prevotella, and Gemmiger were prominent genera in all piglets. Ruminococcus, Prevotella, Oscillospira, Eubacterium, Gemmiger, Dorea, and Lactobacillus populations were significantly higher, while Treponema and Coprococcus were significantly lower in BF piglets compared to FF piglets (p < 0.05). The metabolism pathways in the BF piglets were significantly different from FF piglets, which included carbohydrate and amino acid metabolism (p < 0.05). In addition, the top 10 abundance of microbiota were more or less significantly associated with the two phenotypes (p < 0.05). Collectively, these findings provide probable explanations for the importance of BF in neonates and support a theoretical basis for feeding regimes in indigenous Chinese piglets.
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Affiliation(s)
- Jie Zhang
- College of Animal Science and Technology, Southwest University, Chongqing 402460, China
| | - Xi Long
- Chongqing Academy of Animal Science, Chongqing 402460, China
| | - Qinfeng Liao
- College of Animal Science and Technology, Chongqing Three Gorges Vocational College, Chongqing 404155, China
| | - Jie Chai
- Chongqing Academy of Animal Science, Chongqing 402460, China
| | - Tinghuan Zhang
- Chongqing Academy of Animal Science, Chongqing 402460, China
| | - Li Chen
- Chongqing Academy of Animal Science, Chongqing 402460, China
| | - Hang He
- College of Animal Science and Technology, Chongqing Three Gorges Vocational College, Chongqing 404155, China
| | - Yancong Yuan
- College of Animal Science and Technology, Southwest University, Chongqing 402460, China
| | - Kun Wan
- College of Animal Science and Technology, Southwest University, Chongqing 402460, China
| | - Jinyong Wang
- Chongqing Academy of Animal Science, Chongqing 402460, China
| | - Anfang Liu
- College of Animal Science and Technology, Southwest University, Chongqing 402460, China
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Rodent models of metabolic disorders: considerations for use in studies of neonatal programming. Br J Nutr 2022; 128:802-827. [PMID: 34551828 DOI: 10.1017/s0007114521003834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Epidemiologically, metabolic disorders have garnered much attention, perhaps due to the predominance of obesity. The early postnatal life represents a critical period for programming multifactorial metabolic disorders of adult life. Though altricial rodents are prime subjects for investigating neonatal programming, there is still no sufficiently generalised literature on their usage and methodology. This review focuses on establishing five approach-based models of neonatal rodents adopted for studying metabolic phenotypes. Here, some modelled interventions that currently exist to avoid or prevent metabolic disorders are also highlighted. We also bring forth recommendations, guidelines and considerations to aid research on neonatal programming. It is hoped that this provides a background to researchers focused on the aetiology, mechanisms, prevention and treatment of metabolic disorders.
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Abstract
Abstract
Lactation is a critical period during which maternal nutritional and environmental challenges affect milk composition and, therefore, organ differentiation, structure, and function in offspring during the early postnatal period. Evidence to date shows that lactation is a vulnerable time during which transient insults can have lasting effects, resulting in altered health outcomes in offspring in adult life. Despite the importance of the developmental programming that occurs during this plastic period of neonatal life, there are few comprehensive reviews of the multiple challenges—especially to the dam—during lactation. This review presents milk data from rodent studies involving maternal nutritional challenges and offspring outcome data from studies involving maternal manipulations during lactation. Among the topics addressed are maternal nutritional challenges and the effects of litter size and artificial rearing on offspring metabolism and neural and endocrine outcomes. The lactation period is an opportunity to correct certain functional deficits resulting from prenatal challenges to the fetus, but, if not personalized, can also lead to undesirable outcomes related to catch up-growth and overnutrition.
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Xu R, Lei YH, Shi J, Zhou YJ, Chen YW, He ZJ. Effects of lactadherin on plasma D-lactic acid and small intestinal MUC2 and claudin-1 expression levels in rats with rotavirus-induced diarrhea. Exp Ther Med 2016; 11:943-950. [PMID: 26998017 DOI: 10.3892/etm.2016.3015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 11/25/2015] [Indexed: 12/13/2022] Open
Abstract
The aim of the present study was to investigate the effects of lactadherin on plasma D-lactic acid and small intestinal mucin (MUC) 2 and claudin-1 expression levels in rats with diarrhea induced by rotavirus (RV) infection. A total of 75 seven-day-old healthy Sprague-Dawley rats were randomly divided into the following five groups: Control (C), RV infection (RVI), lactadherin before rotavirus infection (LBRI), lactadherin after rotavirus infection (LARI), and blank (B). On day 4 of artificial feeding, the rats in groups RVI, LBRI and LARI were intragastric administered 1×106 PFU RV; whereas the rats in groups C and B were intragastrically administered an equal volume of maintenance solution from the RV supernatant and normal saline, respectively. In the LBRI and LARI groups, rats received daily intragastric administration of 0.25 mg lactadherin for three days prior to and following infection with RV, respectively. The course of diarrheal symptoms was observed in each group and samples were collected on days 1, 4, and 7 post-infection in order to determine the mucosal morphology, plasma D-lactic acid levels and the expression levels of MUC2 and the intracellular junction protein, claudin-1, in the small intestine. On day 4 post-infection, the rats in group RVI demonstrated severely damaged small intestines and typical diarrheal characteristics, as detected by light microscopy; whereas rats in groups LBRI and LARI demonstrated intact small intestinal villi with partial vacuolation of epithelial cells and changes in the position of their nuclei. Electron microscopy demonstrated that the rats in the RVI group had sparse, shortened, disordered intestinal microvilli and widened intercellular junctions; whereas those in groups LBRI and LARI had long intestinal microvilli sparser compared with groups B and C and slightly widened intercellular junctions. Plasma D-lactic acid levels were increased in groups RVI, LBRI and LARI, as compared with groups B and C, and the greatest levels were detected in the RVI group on days 1, 4 and 7 post-infection. In addition to maintaining intestinal permeability, lactadherin enhanced the expression levels of MUC2 and reduced the expression of claudin-1; therefore, further protecting the intestinal epithelial barrier, which may contribute to the prevention and treatment of diarrhea induced by infection with RV.
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Affiliation(s)
- Rui Xu
- Department of Neonatology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China
| | - Yi-Hui Lei
- Department of Neonatology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China; Department of Perinatal Research Laboratory, Shanghai Institute for Pediatric Research Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China; Department of Neonatology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Jun Shi
- Department of Neonatology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China
| | - Yi-Jun Zhou
- Department of Neonatology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China
| | - Ying-Wei Chen
- Department of Perinatal Research Laboratory, Shanghai Institute for Pediatric Research Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China; Department of Pediatric Gastroenterology and Nutrition Key Laboratory, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China
| | - Zhen-Juan He
- Department of Neonatology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China; Department of Perinatal Research Laboratory, Shanghai Institute for Pediatric Research Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, P.R. China
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Kinouchi T, Koyama S, Harada E, Yajima T. Large molecule protein feeding during the suckling period is required for the development of pancreatic digestive functions in rats. Am J Physiol Regul Integr Comp Physiol 2012; 303:R1268-76. [DOI: 10.1152/ajpregu.00064.2012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We examined if large molecule protein feeding during the suckling period is prerequisite for the proper development of pancreatic digestive functions. Most amino acids in breast milk exist as the constituent of large proteins and not as oligopeptides or free amino acids. Accumulating evidence indicates the nutritional importance of large protein feeding for suckling infants; however, evidence on the physiological significance remains small. We thus artificially reared rat pups on a standard rat formula with milk protein or a formula with milk protein hydrolysate from 7 to 21 days of age, and thereafter, fed a standard solid diet until 42 days of age. Pancreas weight and the stock of pancreatic digestive enzymes in the hydrolysate-fed rats were significantly lower than those in the protein-fed rats during and also after the suckling period. Plasma insulin, a stimulator of amylase synthesis, was also significantly low in the hydrolysate-fed rats compared with the protein-fed rats. At 28 days of age, we evaluated the pancreatic secretory ability in response to dietary protein and cholecystokinin (CCK) by means of pancreatic duct cannulation. Pancreatic secretion stimulated by dietary protein in the hydrolysate-fed rats was significantly weaker than that in the protein-fed rats. No significant difference was observed in the increasing rate of pancreatic enzyme secretion in response to CCK between the two groups. These results suggest that the presence of large proteins in breast milk is significant for the development of pancreatic digestive functions and the outcomes could remain even later on in life.
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Affiliation(s)
- Toshi Kinouchi
- Nutrition Research Department, R&D Division, Meiji Company, Ltd., Odawara, Japan; and
| | - Satomi Koyama
- Nutrition Research Department, R&D Division, Meiji Company, Ltd., Odawara, Japan; and
| | - Etsumori Harada
- Department of Veterinary Medicine, Faculty of Agriculture, Tottori University, Tottori, Japan
| | - Takaji Yajima
- Nutrition Research Department, R&D Division, Meiji Company, Ltd., Odawara, Japan; and
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Ohtsuka Y, Okada K, Yamakawa Y, Ikuse T, Baba Y, Inage E, Fujii T, Izumi H, Oshida K, Nagata S, Yamashiro Y, Shimizu T. ω-3 fatty acids attenuate mucosal inflammation in premature rat pups. J Pediatr Surg 2011; 46:489-95. [PMID: 21376198 DOI: 10.1016/j.jpedsurg.2010.07.032] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2010] [Revised: 07/27/2010] [Accepted: 07/27/2010] [Indexed: 01/06/2023]
Abstract
BACKGROUND Necrotizing enterocolitis (NEC) is a devastating intestinal disease of premature infants. Although ω-3 fatty acids are known to have antiinflammatory effects, their effect against NEC remains unclear. METHODS Mother rats fed a soybean-based, docosahexaenoic acid (DHA)- or eicosapentaenoic acid (EPA)-enriched diet from days 7 to 20 of gestation were examined. On day 20, the rat pups were delivered by abdominal incision, their intestines were removed, and messenger RNA was extracted. A rat NEC model was used to confirm the effects of ω-3 fatty acids on the inflamed intestine (n = 20-28). The expression of inflammatory molecules was analyzed by real-time polymerase chain reaction (n = 11-14). RESULTS The concentrations of DHA and EPA in the intestine were significantly increased in the DHA and EPA groups (P < .01). The expression of the antiinflammatory prostaglandin E2 receptor EP3 was increased in the DHA (P < .05) and EPA groups (P < .01). In the NEC model, the reduced incidence of colitis was confirmed in the DHA and EPA groups. The expression of peroxisome proliferator-activated receptor γ was increased (P < .05), and the inhibitor of nuclear factor-κB α/β decreased in both the DHA (P < .01) and EPA groups (P < .05). CONCLUSION Our findings indicate that ω-3 fatty acids are beneficial for protecting the premature intestine from inflammation by regulating eicosanoid- and nuclear factor-κB-related metabolite expression.
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MESH Headings
- Animals
- Animals, Newborn
- Anti-Inflammatory Agents/administration & dosage
- Anti-Inflammatory Agents/pharmacology
- Anti-Inflammatory Agents/therapeutic use
- Dietary Fats, Unsaturated/administration & dosage
- Dietary Fats, Unsaturated/therapeutic use
- Disease Models, Animal
- Docosahexaenoic Acids/administration & dosage
- Docosahexaenoic Acids/pharmacology
- Docosahexaenoic Acids/therapeutic use
- Drug Evaluation, Preclinical
- Eicosapentaenoic Acid/administration & dosage
- Eicosapentaenoic Acid/pharmacology
- Eicosapentaenoic Acid/therapeutic use
- Enterocolitis, Necrotizing/chemically induced
- Enterocolitis, Necrotizing/prevention & control
- Fatty Acids/analysis
- Female
- Gene Expression Regulation/drug effects
- Ileum/chemistry
- Ileum/drug effects
- Ileum/embryology
- Infant Food/toxicity
- Intestinal Mucosa/drug effects
- Maternal-Fetal Exchange
- Models, Animal
- NF-kappa B/drug effects
- PPAR gamma/biosynthesis
- PPAR gamma/genetics
- Pregnancy
- Random Allocation
- Rats
- Rats, Sprague-Dawley
- Receptors, Prostaglandin E, EP3 Subtype/biosynthesis
- Receptors, Prostaglandin E, EP3 Subtype/genetics
- Soybean Oil
- Specific Pathogen-Free Organisms
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Affiliation(s)
- Yoshikazu Ohtsuka
- Department of Pediatrics and Adolescence Medicine, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan.
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7
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Khailova L, Mount Patrick SK, Arganbright KM, Halpern MD, Kinouchi T, Dvorak B. Bifidobacterium bifidum reduces apoptosis in the intestinal epithelium in necrotizing enterocolitis. Am J Physiol Gastrointest Liver Physiol 2010; 299:G1118-27. [PMID: 20705904 PMCID: PMC2993641 DOI: 10.1152/ajpgi.00131.2010] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Necrotizing enterocolitis (NEC) is a devastating intestinal disease of neonates, and clinical studies suggest the beneficial effect of probiotics in NEC prevention. Recently, we have shown that administration of Bifidobacterium bifidum protects against NEC in a rat model. Intestinal apoptosis can be suppressed by activation of cyclooxygenase-2 (COX-2) and increased production of prostaglandin E(2) (PGE(2)). The present study investigates the effect of B. bifidum on intestinal apoptosis in the rat NEC model and in an intestinal epithelial cell line (IEC-6), as a mechanism of protection against mucosal injury. Premature rats were divided into the following three groups: dam fed, hand fed with formula (NEC), or hand fed with formula supplemented with B. bifidum (NEC + B. bifidum). Intestinal Toll-like receptor-2 (TLR-2), COX-2, PGE(2), and apoptotic regulators were measured. The effect of B. bifidum was verified in IEC-6 cells using a model of cytokine-induced apoptosis. Administration of B. bifidum increased expression of TLR-2, COX-2, and PGE(2) and significantly reduced apoptosis in the intestinal epithelium of both in vivo and in vitro models. The Bax-to-Bcl-w ratio was shifted toward cell survival, and the number of cleaved caspase-3 positive cells was markedly decreased in B. bifidum-treated rats. Experiments in IEC-6 cells showed anti-apoptotic effect of B. bifidum. Inhibition of COX-2 signaling blocked the protective effect of B. bifidum treatment in both in vivo and in vitro models. In conclusion, oral administration of B. bifidum activates TLR-2 in the intestinal epithelium. B. bifidum increases expression of COX-2, which leads to higher production of PGE(2) in the ileum and protects against intestinal apoptosis associated with NEC. This study indicates the ability of B. bifidum to downregulate apoptosis in the rat NEC model and in IEC-6 cells by a COX-2-dependent matter and suggests a molecular mechanism by which this probiotic reduces mucosal injury and preserves intestinal integrity.
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Affiliation(s)
- Ludmila Khailova
- Department of 1Pediatrics and Steele Children's Research Center, and
| | | | | | | | - Toshi Kinouchi
- 2Food Science Institute, Meiji Dairies Corporation, Odawara, Japan
| | - Bohuslav Dvorak
- Department of 1Pediatrics and Steele Children's Research Center, and ,3Cell Biology & Anatomy, University of Arizona, Tucson, Arizona; and
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Breast- v. formula-feeding: impacts on the digestive tract and immediate and long-term health effects. Nutr Res Rev 2010; 23:23-36. [PMID: 20450531 DOI: 10.1017/s0954422410000065] [Citation(s) in RCA: 267] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The health benefits of breast-feeding have been recognised for a long time. In particular, breast-feeding is associated with lower incidence of necrotising enterocolitis and diarrhoea during the early period of life and with lower incidence of inflammatory bowel diseases, type 2 diabetes and obesity later in life. The higher nutritional and protective degree of human milk is related to its nutritional composition that changes over the lactation period and to the biological activities of specific components while lower growth rate of breast-fed infants may be attributed to their self-regulation of milk intake at a lower level than formula-fed infants. Many results now suggest that the developmental changes in intestinal and pancreatic function that occur postnatally are modulated by the diet. Indeed, formula-feeding induces intestinal hypertrophy and accelerates maturation of hydrolysis capacities; it increases intestinal permeability and bacterial translocation, but does not induce evident differences in microbiota composition. Whether these changes would be beneficial for enhancing absorptive capacities and for educating the gut-associated immune system remains to be further studied. Moreover, it is evident that formula-feeding increases basal blood glucose and decreases plasma ketone body concentrations, while discrepancies on postprandial glycaemia, insulin and incretin responses in both human studies and experimental studies are inconclusive. Manipulating the composition of formula, by reducing protein content, adding prebiotics, growth factors or secretory IgA can modulate intestinal and pancreatic function development, and thereby may reduce the differential responses between breast-fed and formula-fed neonates. However, the developmental responses of the digestive tract to different feeding strategies must be elucidated in terms of sensitivity to developing diseases, taking into account the major role of the intestinal microbiota.
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9
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The role of the lactadherin in promoting intestinal DCs development in vivo and vitro. Clin Dev Immunol 2010; 2010:357541. [PMID: 20379374 PMCID: PMC2850507 DOI: 10.1155/2010/357541] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2009] [Revised: 01/12/2010] [Accepted: 01/12/2010] [Indexed: 12/16/2022]
Abstract
Lactadherin, as one of the immune components in the breast milk, might play a role in the intestinal immune system of newborn. Therefore, we investigated the effect of lactadherin-feeding in early time on the development of intestinal immune system compared with naturally rearing and artificially rearing (non-lactadherin). In the present study, we observed that the Peyer's Patches (PP) from the pups of artificially reared group with lactadherin added were characterized by an excess of OX62(+)CD4(+)SIRP(+) DC cells and a higher expression of CD3(+)CD4(+)CD25(+)T cells. Additionally, this study also demonstrated that IL-10 production was dramatically increased when lactadherin was present in culture medium compared with lactadherin-absent culture. These results suggested that lactadherin could adjust intestinal DCs activity, induce CD3(+)CD4(+)CD25(+)T cell differentiation, and enhance IL-10 production.
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10
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Khailova L, Dvorak K, Arganbright KM, Halpern MD, Kinouchi T, Yajima M, Dvorak B. Bifidobacterium bifidum improves intestinal integrity in a rat model of necrotizing enterocolitis. Am J Physiol Gastrointest Liver Physiol 2009; 297:G940-9. [PMID: 20501441 PMCID: PMC2777452 DOI: 10.1152/ajpgi.00141.2009] [Citation(s) in RCA: 129] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Neonatal necrotizing enterocolitis (NEC) is a major cause of morbidity and mortality in premature infants. Oral administration of probiotics has been suggested as a promising strategy for prevention of NEC. However, little is known about the mechanism(s) of probiotic-mediated protection against NEC. The aim of this study was to evaluate the effects of Bifidobacterium bifidum treatment on development of NEC, cytokine regulation, and intestinal integrity in a rat model of NEC. Premature rats were divided into three groups: dam fed (DF), hand fed with formula (NEC), or hand fed with formula supplemented with 5 x 10(6) CFU B. bifidum per day (B. bifidum). All groups were exposed to asphyxia and cold stress to develop NEC. Intestinal injury, mucin and trefoil factor 3 (Tff3) production, cytokine levels, and composition of tight junction (TJ) and adherens junction (AJ) proteins were evaluated in the terminal ileum. B. bifidum decreased the incidence of NEC from 57 to 17%. Increased levels of IL-6, mucin-3, and Tff3 in the ileum of NEC rats was normalized in B. bifidum treated rats. Reduced mucin-2 production in the NEC rats was not affected by B. bifidum. Administration of B. bifidum normalized the expression and localization of TJ and AJ proteins in the ileum compared with animals with NEC. In conclusion, administration of B. bifidum protects against NEC in the neonatal rat model. This protective effect is associated with reduction of inflammatory reaction in the ileum, regulation of main components of mucus layer, and improvement of intestinal integrity.
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Affiliation(s)
| | - Katerina Dvorak
- 2Department of Cell Biology and Anatomy, University of Arizona, Tucson, Arizona;
| | | | | | - Toshi Kinouchi
- 3Food Science Institute, Meiji Dairies Corporation, Odawara, Japan; and
| | - Masako Yajima
- 4Creative Research Institute Sousei, Hokkaido University, Sapporo, Japan
| | - Bohuslav Dvorak
- 1Department of Pediatrics and ,2Department of Cell Biology and Anatomy, University of Arizona, Tucson, Arizona;
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Artificial rearing of infant mice leads to n-3 fatty acid deficiency in cardiac, neural and peripheral tissues. Lipids 2009; 44:685-702. [PMID: 19588181 DOI: 10.1007/s11745-009-3318-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2008] [Accepted: 06/03/2009] [Indexed: 02/05/2023]
Abstract
The ability to control the fatty acid content of the diet during early development is a crucial requirement for a one-generation model of docosahexaenoic acid (DHA; 22:6n3) deficiency. A hand feeding method using artificial rearing (AR) together with sterile, artificial milk was employed for feeding mice from postnatal day 2-15. The pups were fed an n-3 fatty acid adequate (3% alpha-linolenic acid (LNA; 18:3n3) + 1% 22:6n3) or a deficient diet (0.06% 18:3n3) with linoleic acid (LA; 18:2n6) as the only dietary source of essential fatty acids by AR along with a dam-reared control group (3.1% 18:3n3). The results indicate that restriction of n-3 fatty acid intake during postnatal development leads to markedly lower levels of brain, retinal, liver, plasma and heart 22:6n3 at 20 weeks of age with replacement by docosapentaenoic acid (DPAn6; 22:5n6), arachidonic acid (ARA; 20:4n6) and docosatetraenoic acid (DTA; 22:4n6). A detailed analysis of phospholipid classes of heart tissue indicated that phosphatidylethanolamine, phosphatidylcholine and cardiolipin were the major repositories of 22:6n3, reaching 40, 29 and 15%, respectively. A novel heart cardiolipin species containing four 22:6n3 moieties is described. This is the first report of the application of artificially rearing to mouse pup nutrition; this technique will facilitate dietary studies of knockout animals as well as the study of essential fatty acid (EFA) functions in the cardiovascular, neural and other organ systems.
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12
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Izumi H, Ishizuka S, Inafune A, Hira T, Ozawa K, Shimizu T, Takase M, Hara H. alpha-Lactalbumin hydrolysate stimulates glucagon-like peptide-2 secretion and small intestinal growth in suckling rats. J Nutr 2009; 139:1322-7. [PMID: 19494023 DOI: 10.3945/jn.109.106401] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigated whether bovine milk constituents influenced glucagon-like peptide (GLP)-2 secretion and intestinal growth in suckling rats. Male Sprague-Dawley rats (14 d old) received i.g. infusions of a milk protein fraction, a lactose solution, or the cream fraction of milk. The serum concentration of GLP-2, but not GLP-1, markedly increased in rats administered milk protein compared with those given the lactose solution or the cream fraction from 60 to 120 min after administration. In another experiment, both casein (CN) and whey protein isolate stimulated GLP-2 secretion at 120 min after administration, but soy protein and ovalbumin did not. Stimulation of GLP-2 secretion by several milk proteins was similar, including alpha-CN, alpha-lactalbumin (alpha-La), and beta-lactoglobulin, in a separate experiment. A hydrolysate of alpha-La obtained by incubation with protease A extracted from Aspergillus oryzae (LaHPA) caused almost twice the GLP-2 release due to intact alpha-La and other alpha-La hydrolysates. Free amino acid concentrations and molecular size distributions did not differ among alpha-La hydrolysates, including LaHPA. In rat pups reared with milk formulae containing alpha-La or LaHPA, LaHPA significantly promoted small intestinal elongation and increased the number of crypt epithelial cells compared with a formula containing intact alpha-La. LaHPA administration also increased the maltase:lactase activity ratio, a marker of maturation of the intestinal mucosa. In conclusion, milk proteins stimulate GLP-2 secretion and contribute to growth and maturation of the small intestine in suckling rats.
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Affiliation(s)
- Hirohisa Izumi
- Nutritional Science Laboratory, Morinaga Milk Industry Co., Ltd., Zama, Kanagawa 228-8583, Japan.
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13
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Yang Q, O'Shea TM. Dietary Echium oil increases tissue (n-3) long-chain polyunsaturated fatty acids without elevating hepatic lipid concentrations in premature neonatal rats. J Nutr 2009; 139:1353-9. [PMID: 19439463 DOI: 10.3945/jn.109.105221] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Echium oil (EO) contains notable quantities of both (n-6) and (n-3) PUFA and has not, to our knowledge, been studied in neonates. We compared growth, tissue PUFA concentrations, and liver lipid profiles in premature neonatal Sprague-Dawley rats that were fed an EO diet with those that were dam-fed (DF) or fed rat milk substitute (RMS) or a fish oil (FO) diet. EO or FO comprised 10% of dietary fat. Rats were delivered prematurely at d 21 of gestation by caesarean section and then DF or fed one of the diets for 6 d. Rats were killed and the fatty acid (FA) concentrations in brain, liver, ileum, and serum and liver lipid profiles were analyzed. All diet-fed rats had similar weight gain and tissue protein concentrations. Compared with DF rats, EO-fed rats had similar brain docosahexaenoic acid (DHA) levels, similar brain and liver arachidonic acid (ARA) levels, higher liver and ileal eicosapentaenoic acid (EPA) levels (P < 0.05), and similar ARA:(EPA+DHA) ratios in brain, liver, and serum. Compared with RMS-fed rats, EO-fed rats had lower liver triglyceride FA and cholesterol ester concentrations (P < 0.05), higher EPA and DHA levels in liver, ileum, and serum, a higher DHA level in brain, and lower tissue and serum ratios of total (n-6):(n-3) PUFA and ARA:(EPA + DHA) (P < 0.05). Compared with FO-fed rats, EO-fed rats had higher ARA levels in brain, liver, ileum, and serum. In conclusion, dietary EO increases tissue EPA and DHA without reducing ARA in brain and liver and without elevating hepatic lipid concentrations of premature neonatal rats.
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Affiliation(s)
- Qing Yang
- Department of Pediatrics, Division of Neonatology, Wake Forest University Health Science, Winston-Salem, NC 27157, USA
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14
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Cellular expression of a monocarboxylate transporter (MCT1) in the mammary gland and sebaceous gland of mice. Histochem Cell Biol 2008; 131:401-9. [DOI: 10.1007/s00418-008-0543-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/07/2008] [Indexed: 01/12/2023]
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15
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Barrat E, Michel C, Poupeau G, David-Sochard A, Rival M, Pagniez A, Champ M, Darmaun D. Supplementation with galactooligosaccharides and inulin increases bacterial translocation in artificially reared newborn rats. Pediatr Res 2008; 64:34-9. [PMID: 18344902 DOI: 10.1203/pdr.0b013e3181732381] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Supplementation of formulas with prebiotics enhances the growth of lactate producing bacteria, and fecal lactate, and acetate levels in infants. High concentrations of organic acids in intestinal lumen have, however, been shown to impair the intestinal barrier function. To determine whether stimulating the colonic microbiotal metabolism with prebiotics would impair the neonatal intestinal barrier function, artificially reared rats were fed milk formula with or without a mixture of galactooligosaccharides/inulin (GOS/Inulin, 88/12; 5.6 g/L) from the 7th d of life (d7) until weaning (d20). At d18, GOS/inulin supplementation had increased the concentrations of acetate and lactate in colonic lumen. Although neither ileum-associated microbiota nor colonic permeability (assessed in Ussing chambers), nor the expression of tight junction claudin-2 and claudin-3 mRNA were altered, GOS/inulin supplementation was associated with increased bacterial translocation (BT) toward spleen. None of these effects persisted at d40. We conclude that GOS/inulin supplementation may increase BT in an immature gut. The balance between the potential infectious risk of BT vs. its putative beneficial effect on the maturation of neonatal immune system clearly warrants further study.
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Affiliation(s)
- Emmanuel Barrat
- UMR 1280, Physiologie des Adaptations Nutritionnelles, Université de Nantes, Nantes, F-44093, France
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16
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Henare SJ, Mellor DJ, Lentle RG, Moughan PJ. An appraisal of the strengths and weaknesses of newborn and juvenile rat models for researching gastrointestinal development. Lab Anim 2008; 42:231-45. [DOI: 10.1258/la.2007.007034] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Research on the impact of bioactive compounds on the development and functional maturation of the gastrointestinal (GI) tract using newborn and juvenile rats has greatly contributed to the knowledge of GI physiology and to the improved clinical management of both premature and full-term newborns. Of the animal models available, two types have been described for use with young rats – maintenance models and substitution models. Maintenance models are those in which the young are reared with the dam and therefore benefit from continuation of natural nutrition and maternal care. Substitution models are those in which the young are reared in the absence of the dam using artificially formulated milk delivered by various means into specific GI sites. In this review, we describe these models and their operation, and discuss the strengths and weaknesses of each. Attention is also given to questions of scientific validity and some animal welfare issues raised by the use of these models.
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Affiliation(s)
- S J Henare
- Riddet Centre, Massey University, Private Bag 11 222, Palmerston North, New Zealand
| | - D J Mellor
- Riddet Centre, Massey University, Private Bag 11 222, Palmerston North, New Zealand
- Institute of Food Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| | - R G Lentle
- Institute of Food Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| | - P J Moughan
- Riddet Centre, Massey University, Private Bag 11 222, Palmerston North, New Zealand
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17
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Yajima M, Kanno T, Yajima T. A chemically derived milk substitute that is compatible with mouse milk for artificial rearing of mouse pups. Exp Anim 2006; 55:391-7. [PMID: 16880687 DOI: 10.1538/expanim.55.391] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
The object of this study was to prepare a chemically derived milk substitute that is compatible with mouse-milk. Milk was independently collected from ICR, BALB/c, and FVB/N mice, and analyzed for the protein, fat, and mineral contents to formulate a milk substitute. Thereafter, ICR mouse pups were artificially reared on the milk substitute to evaluate the rate of increase of their body weights. A gastric cannula tube was placed through the esophageal way into 8-day-old ICR pups, and the mice were fed with the milk substitute by computer-regulated infusion pumping by the pup-in-a-cup method. The analytical mean values of total protein and total fat in milk from ICR, BALB/c, and FVB/N mice were 10.23 +/- 0.49% and 21.34 +/- 1.31%, respectively. The milk substitute was constituted from purified bovine casein and whey proteins, five edible oils, including MCT oil, minerals, and vitamins. After 8 days of artificial rearing with the new milk substitute, 36 of the 42 pups had survived, and the growth rate of these mice was not significantly different from that of maternally reared littermate pups. In conclusion, we have succeeded in the preparation of a chemically derived milk substitute for mice pups which is available for clarifying the roles of dietary components such as milk-bone substance during the suckling period in mice pups including those of knockout and transgenic mice.
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Affiliation(s)
- Masako Yajima
- Food Function and Nutrition Science Institute, Division of Research and Development, Meiji Dairies Corporation, 540 Naruda, Odawara, Kanagawa 250-0862, Japan
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18
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Kume H, Sasaki H, Kano-Sueoka T. Serum ethanolamine and hepatocyte proliferation in perinatal and partially hepatectomized rats. Life Sci 2006; 79:1764-72. [PMID: 16872638 DOI: 10.1016/j.lfs.2006.06.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2006] [Revised: 06/01/2006] [Accepted: 06/08/2006] [Indexed: 10/24/2022]
Abstract
It has been shown that the administration of ethanolamine (Etn) to partially hepatectomized rats enhances stimulation of DNA synthesis in regenerating hepatocytes. The present study aimed to test the hypothesis that the level of serum Etn in vivo may be regulated to control the growth of hepatocytes. Concentrations of serum Etn were determined in rats 1) of varying ages (from embryonic-19 (E-19) to 7-week-old), and 2) during regeneration following two-thirds hepatectomy (PH), to investigate whether serum Etn concentration correlates with the rate of proliferation of hepatocytes in growing animals or during regeneration. Serum Etn levels were 3 fold higher in E-19 fetuses and newborns than in adults, and were increased 2 fold 4 h after PH and remained high for at least 24 h. Results in both systems indicated a significant positive correlation between the rate of hepatocyte proliferation and serum Etn levels. Furthermore, Etn supplementation of 0.1 to 1 mmol immediately after PH promoted a significant weight gain and stimulated phosphatidylethanolamine (PE) and phosphatidylcholine (PC) synthesis in the regenerating liver. We also observed that whenever serum Etn levels were elevated, the metabolism of PE and PC in the liver changed dynamically, first by elevating the net synthesis of PE. Taken together, these results suggested that the levels of serum Etn might be regulated based on the physiological state of an animal, which consequently regulates the proliferation of hepatocytes.
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Affiliation(s)
- Hisae Kume
- Department of Nutritional Research, Food Science Institute, Meiji Dairies Corporation, 540 Naruda, Odawara 250-0862, Japan.
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19
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Ishii T, Furuoka H, Kitamura N, Muroi Y, Nishimura M. The mesencephalic trigeminal sensory nucleus is involved in acquisition of active exploratory behavior induced by changing from a diet of exclusively milk formula to food pellets in mice. Brain Res 2006; 1111:153-61. [PMID: 16890921 DOI: 10.1016/j.brainres.2006.06.098] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2006] [Revised: 06/26/2006] [Accepted: 06/29/2006] [Indexed: 11/28/2022]
Abstract
Post-weaning mice fed exclusively milk display low-frequency exploratory behavior [Ishii, T., Itou, T., and Nishimura, M. (2005) Life Sci. 78, 174-179] compared to mice fed a food pellet diet. This low-frequency exploratory behavior switched to high-frequency exploration after a switch from exclusively milk formula to a food pellet diet. Acquisition of the high-frequency exploratory behavior was irreversible. Recently, we demonstrated that the mesencephalic trigeminal nucleus (Me5) is involved in the control of feeding and exploratory behavior in mice without modulating the emotional state [Ishii, T., Furuoka, H., Itou, T., Kitamura, N., and Nishimura, M. (2005) Brain Res. 1048, 80-86]. We therefore investigated whether the Me5 is involved in acquisition of high-frequency exploratory behavior induced by the switch in diet from an exclusively milk formula to food pellets. Mouse feeding and exploratory behaviors were analyzed using a food search compulsion apparatus, which was designed to distinguish between the two behaviors under standard living conditions. Immunohistochemical analysis of immediate early genes indicated that the Me5, which receives signals from oral proprioceptors, is transiently activated after the diet change. The change from low-frequency to high-frequency exploratory behavior was prevented in milk-fed mice by bilateral lesion of the Me5. These results suggest that the Me5 is activated by signals associated with mastication-induced proprioception and contributes to the acquisition of active exploratory behavior.
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Affiliation(s)
- Toshiaki Ishii
- Department of Pathobiological Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan.
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Ishii T, Itou T, Nishimura M. Comparison of growth and exploratory behavior in mice fed an exclusively milk formula diet and mice fed a food-pellet diet post weaning. Life Sci 2005; 78:174-9. [PMID: 16107260 DOI: 10.1016/j.lfs.2005.04.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2005] [Accepted: 04/15/2005] [Indexed: 11/24/2022]
Abstract
An exclusively milk formula diet stunted the growth of mice immediately following weaning. Milk-fed mice displayed a low-frequency profile of exploratory behavior, while pellet-fed mice showed high-frequency exploration. In contrast to exploratory behavior, feeding behavior did not differ significantly between milk- and pellet-fed mice. Despite showing low-frequency exploratory behavior, mice on an exclusively milk formula diet showed no difference in behavioral activities analyzed by an automatic hole-board apparatus compared to pellet-fed mice. These results suggest that the growth stunt caused by an exclusively milk formula diet retards the acquisition of active exploratory behavior without affecting the emotional state of mice.
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Affiliation(s)
- Toshiaki Ishii
- Department of Pathobiological Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan.
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Lim SY, Hoshiba J, Salem N. An extraordinary degree of structural specificity is required in neural phospholipids for optimal brain function: n-6 docosapentaenoic acid substitution for docosahexaenoic acid leads to a loss in spatial task performance. J Neurochem 2005; 95:848-57. [PMID: 16135079 DOI: 10.1111/j.1471-4159.2005.03427.x] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This study was conducted to determine whether provision of preformed dietary docosapentaenoic acid (DPAn-6) can replace docosahexaenoic acid (DHA) for brain function as assessed by spatial task performance. A newly modified artificial rearing method was employed to generate n-3 fatty acid-deficient rats. Newborn pups were separated from their mothers at 2 days of age and given artificial rat milk containing linoleic acid (LA), or LA supplemented with 1% DHA (DHA), 1% DPAn-6 (DPA) or 1% DHA plus 0.4% DPAn-6 (DHA/DPA). The animals were then weaned onto similar pelleted diets. At adulthood, behavioural tasks were administered and then the brains were collected for fatty acid analysis. The LA and DPA groups showed a lower (63-65%) brain DHA than the dam-reared, DHA and DHA/DPA groups and this loss was largely compensated for by an increase in brain DPAn-6. The brain fatty acid composition in the DPA group was the same as that in the LA group at adulthood. In the Morris water maze, the LA and DPA groups exhibited a longer escape latency than the dam-reared and DHA groups and had a defect in spatial retention. In conclusion, DPAn-6 could not replace DHA for brain function, indicating a highly specific structural requirement for DHA.
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Affiliation(s)
- Sun-Young Lim
- Division of Marine Environment and Bioscience, Korea Maritime University, Busan, Korea
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22
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Lim SY, Hoshiba J, Moriguchi T, Salem N. N-3 fatty acid deficiency induced by a modified artificial rearing method leads to poorer performance in spatial learning tasks. Pediatr Res 2005; 58:741-8. [PMID: 16189203 DOI: 10.1203/01.pdr.0000180547.46725.cc] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Docosahexaenoic acid (DHA) is a major structural component of the nervous system, and depletion may lead to losses in neural function. Our objective was to demonstrate a deficit in spatial task performance in rats with low brain DHA due to a low n-3 fatty acid intake using a first-generational artificial rearing technique. Newborn rat pups were separated on d 2 and assigned to two artificial rearing groups or a dam-reared control group. Pups were hand fed artificial milk via custom-designed nursing bottles containing either 0.02% (n-3 Def) or 3.1% (n-3 Adq) of total fatty acids as LNA. At d 21, rats were weaned to either n-3 Def or n-3 Adq pelleted diets and several behavioral tasks were evaluated at 9 wk of age. Brain DHA was lower (58% and 61%, p < 0.001) in n-3 Def in comparison to n-3 Adq and dam-reared rats, respectively. At adulthood, the n-3 fatty acid-deficient rats had a significantly greater moving time than the dam-reared group (p < 0.05), but there were no differences among the three groups in the elevated plus maze test. The n-3 fatty acid deficient rats exhibited a longer escape latency (p < 0.05) and poorer memory retention in the Morris water maze compared with n-3 fatty acid adequate and dam-reared rats. We concluded that artificial rearing can be used to produce n-3 fatty acid deficiency in the first generation. This deficiency was associated with significantly reduced spatial learning. Adequate brain DHA levels are required for optimal spatial learning.
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Affiliation(s)
- Sun-Young Lim
- Marine Environment and Bioscience, Korea Maritime University, Busan
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23
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Lefkowitz W, Lim SY, Lin Y, Salem N. Where does the developing brain obtain its docosahexaenoic acid? Relative contributions of dietary alpha-linolenic acid, docosahexaenoic acid, and body stores in the developing rat. Pediatr Res 2005; 57:157-65. [PMID: 15531740 DOI: 10.1203/01.pdr.0000147572.57627.ae] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Docosahexaenoic acid (DHA), a 22-carbon, highly unsaturated, n-3 fatty acid, is important for optimal nervous system function. In this study, designed to quantify how preformed dietary DHA regulates metabolic pathways in vivo, 8-d-old rat pups were divided into four groups and fed artificial rat milk diets. One group was fed formula with deuterium-labeled LNA (d5-LNA) as the only source of n-3 fatty acids, and a second group was fed formula that contained d5-LNA and unlabeled DHA. Two additional groups were dam-reared to permit analysis of fatty acyl pool sizes at postnatal days 8 and 28. The dams were fed a diet that contained 3% unlabeled LNA. DHA in brain and liver was analyzed. Our study demonstrated that preformed DHA in the diet markedly decreased the amount of biosynthesized DHA that accumulated in the brain and the liver. Surprisingly, 40% of the DHA that was newly acquired during this period in the "LNA" group was unlabeled. Because there were no unlabeled n-3 fatty acids in this diet, this DHA must have been derived from body stores of n-3 fatty acids. Thus, body stores can be a significant source of brain DHA in animals that are fed LNA as the only source of n-3 fatty acids.
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Affiliation(s)
- William Lefkowitz
- Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA
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24
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Moriguchi T, Lim SY, Greiner R, Lefkowitz W, Loewke J, Hoshiba J, Salem N. Effects of an n-3-deficient diet on brain, retina, and liver fatty acyl composition in artificially reared rats. J Lipid Res 2004; 45:1437-45. [PMID: 15175358 DOI: 10.1194/jlr.m400087-jlr200] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Rat pups born to dams fed a diet with 3.1% of total fatty acids as alpha-linolenic acid (LNA) were fed, using an artificial rearing system, either an n-3-deficient (n-3-Def) or an n-3-adequate (n-3-Adq) diet. Both diets contained 17.1% linoleic acid, but the n-3-Adq diet also contained 3.1% LNA. The percentage of brain docosahexaenoic acid (DHA) continuously decreased (71%) with time over the 29 days of the experiment, with concomitant increases in docosapentaenoic acid (DPAn-6). In the retina, the percentage of DHA rose in the n-3-Adq group, with an apparent increased rate around the time of eye opening. However, there was a flat curve for the percentage of DHA in the n-3-Def group and a rising DPAn-6 with time. Liver DHA was highest at the time of birth in the n-3-Adq group but fell off somewhat over the course of 29 days. This decrease was more pronounced in the n-3-Def group, and the DPAn-6 rose considerably during the second half of the experiment. This method presents a first-generation model for n-3 deficiency that is more similar to the case of human nutrition than is the commonly employed two-generation model.
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Affiliation(s)
- Toru Moriguchi
- Laboratory of Membrane Biochemistry and Biophysics, National Institutes on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD, USA
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Nakayama M, Yajima M, Hatano S, Yajima T, Kuwata T. Intestinal adherent bacteria and bacterial translocation in breast-fed and formula-fed rats in relation to susceptibility to infection. Pediatr Res 2003; 54:364-71. [PMID: 12788982 DOI: 10.1203/01.pdr.0000077482.28990.2d] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The barrier function of the intestinal mucosa is immature in the newborn mammal, and is strengthened by breast milk. We investigated this effect of breast milk by comparing the susceptibility to infection assessed in terms of adherent bacterial colonization of the intestinal tissue (AdC) and bacterial translocation (BT) between breast-fed and formula-fed newborn rats. Three-day-old rat pups were assigned to one of three groups: mother-reared (MR), pseudo-cannulated (sham), and artificially reared (AR). AR rats were infused with formula through an intragastric cannula, under the control of a computer-regulated pumping machine. MR and sham rat pups were reared with their respective dams and received breast milk until weaning in a specially designed cage. In 10-d-old rats, there was no significant difference in the fecal or cecal flora between the AR and MR groups, whereas the AdC and the BT to the liver were greater in the AR than MR group. Enterobacteriaceae, Streptococcus and/or Enterococcus, and Staphylococcus were dominantly detected as microorganisms in AdC flora and BT. The AdC flora did not directly reflect the bacterial colonization flora. These findings suggest that AR rat pups mature normally, although there is a greater colonization of Enterobacteriaceae and BT in AR than MR pups. Consequently, the intestinal barrier function of the pups reared by artificial feeding may become susceptible to BT, and AdC may be more indicative than bacterial colonization of the susceptibility to BT.
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Affiliation(s)
- Makiko Nakayama
- Nutrition Science Institute, Nutrition Science Institute, Meiji Dairies Corporation, 540, Naruda, Odawara, Kanagawa 250-0862, Japan
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Lane RH, Dvorak B, MacLennan NK, Dvorakova K, Halpern MD, Pham TD, Philipps AF. IGF alters jejunal glucose transporter expression and serum glucose levels in immature rats. Am J Physiol Regul Integr Comp Physiol 2002; 283:R1450-60. [PMID: 12388463 DOI: 10.1152/ajpregu.00172.2002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Milk-borne insulin-like growth factors (IGFs) enhance nutrient absorption in the immature intestine, which is characterized by low levels of glucose oxidation. We therefore hypothesized that feeding a rat milk substitute (RMS) devoid of growth factors to rat pups would lower serum glucose levels relative to dam-fed control rats and that supplementation of RMS with physiological doses of either IGF-I or IGF-II would normalize serum glucose levels via increased jejunal glucose transporter 2 (GLUT2) and high-affinity Na(+)-glucose cotransporter (SGLT1) expression. We found lower serum glucose concentrations in RMS-fed pups; in contrast, serum glucose levels in the IGF-supplemented pups were similar to those of dam-fed controls. RT-PCR and laser scanning confocal microscopy similarly demonstrated that IGF supplementation increased expression of jejunal glucose transporters. Further experiments demonstrated that IGF supplementation altered mRNA levels of key mitochondrial enzymes without altering jejunal lactase activity. We conclude that IGF-I and IGF-II supplementation increases serum glucose levels in the immature rat pup fed artificial formula and alters gene expression of the jejunal glucose transporters.
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Affiliation(s)
- Robert H Lane
- Department of Pediatrics, David Geffen School of Medicine at University of California Los Angeles, Mattel Children's Hospital, Los Angeles, California 90095-1752, USA.
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Anzai N, Suzuki Y, Nishikitani M, Izumida-Moriguchi I, Kokubo A, Kawahara K. Development of renal potassium excretion capacity in the neonatal rat. THE JAPANESE JOURNAL OF PHYSIOLOGY 2001; 51:745-52. [PMID: 11846966 DOI: 10.2170/jjphysiol.51.745] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We investigated the capacity of newborn rats to excrete an acute potassium load to understand the development of a renal potassium excretion system. Three groups of the rats (7-14 d) were used to collect urine periodically over 6 h after oral infusion of potassium: control (no potassium loading) and low- and high-potassium-loaded rats. In the low-potassium-loaded group, infused with about 0.6 microEq of potassium chloride/g body wt., the rate of renal potassium excretion increased from 0.08 plus minus 0.02 (7 d) to 0.13 plus minus 0.02 (10 d) and 0.21 plus minus 0.03 (14 d) microEq/h/g body wt. The high-potassium-loaded rats (1.5-2.8 microEq/g body wt. potassium load) excreted potassium at a higher rate of 0.18 +/- 0.05 (7 d), 0.30 +/- 0.02 (10 d), and 0.45 +/- 0.10 (14 d) microEq/h/g body wt. They excreted 77% (7 d), 76% (10 d), and 95% (14 d) of the potassium load. These values were much larger than the rate of 0.026 microEq/h/g body wt. of the control rats and of 0.08 microEq/h/g body wt., a mean potassium excretion rate during development from 7 to 14 d calculated from the data in the previous study (Kanno T et al.: J. Pediatr. Gastr. Nutr. 24: 242-252, 1997). In the same period, serum potassium concentration in the newborn rats decreased significantly (p < 0.01) from 7.2 +/- 0.1 (7 d) to 6.7 +/- 0.1 mEq/l (14 d). All these results suggest that a renal potassium excretion system in the rat develops at least in the second week of life, and its capacity is high enough to excrete the daily potassium intake.
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Affiliation(s)
- N Anzai
- Department of Physiology, Kitasato University School of Medicine, Sagamihara, 228-8555 Japan
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Yajima M, Nakayama M, Hatano S, Yamazaki K, Aoyama Y, Yajima T, Kuwata T. Bacterial translocation in neonatal rats: the relation between intestinal flora, translocated bacteria, and influence of milk. J Pediatr Gastroenterol Nutr 2001; 33:592-601. [PMID: 11740235 DOI: 10.1097/00005176-200111000-00015] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND A high incidence of bacterial translocation in neonates results not only from immaturity of host-defense functions, but also from the dominant colonization of aerobic bacteria in the intestine. Bacterial colonization develops differently among breast-fed, formula-fed, premature, and full-term infants. The purpose of this study was to examine the incidence of bacterial translocation and to identify the translocated bacterial species, relating these findings to the intestinal microflora and to the type of feeding in neonatal rats. METHODS Animals were divided into three groups: breast-fed normal pups (MR group), formula-fed pups fed via an intragastric cannula implanted esophageally (AR group), and breast-fed pups after the removal of the cannula (Sham group). Artificial rearing was achieved using a machine feeding system. Culture and identification of the bacteria in the intestine, mesenteric lymph nodes, liver, portal blood, and lungs were made using a simplified version of Mitsuoka's method. RESULTS At 14 days of age, the dominant bacteria in the feces of the MR and Sham Groups were Enterobacteriaceae, Lactobacillus, and Enterococcus, but Enterobacteriaceae and Clostridium were significantly more common in the AR group than in the MR group. The dominant bacteria in the mesenteric lymph nodes were Enterobacteriaceae, Lactobacillus, and Staphylococcus. The extent of systemic bacterial translocation decreased earlier in the Sham group than in the AR group. CONCLUSIONS The frequency with which species of bacteria were cultured from mesenteric lymph nodes and other peripheral sites did not mirror the composition of the intestinal flora. Among the translocated bacteria, Staphylococcus may be especially hard to recognize and difficult for the host-defense systems to destroy. Breast-feeding inhibited systemic bacterial translocation in the suckling period of the rat.
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Affiliation(s)
- M Yajima
- Department of Nutritional Research, Nutrition Science Institute, Meiji Milk Products Co., Ltd., 1-21-3 Sakae, Higashimurayama, Tokyo 189-8530, Japan.
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Savidge TC. Gastrointestinal response to food: artificial or not? J Pediatr Gastroenterol Nutr 2000; 31:118-20. [PMID: 10941961 DOI: 10.1097/00005176-200008000-00006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
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30
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Dvorak B, McWilliam DL, Williams CS, Dominguez JA, Machen NW, McCuskey RS, Philipps AF. Artificial formula induces precocious maturation of the small intestine of artificially reared suckling rats. J Pediatr Gastroenterol Nutr 2000; 31:162-9. [PMID: 10941968 DOI: 10.1097/00005176-200008000-00013] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
BACKGROUND The artificially reared rat model was used successfully to study the effect of nutrition during the early postnatal period on growth and development of the neonate. Overgrowth and morphologic changes of the gastrointestinal tract are known consequences of artificial rearing. The major goal of our study was to elucidate whether artificial rearing-enhanced gut development is caused by artificial diet or by gastrostomy and the artificial rearing technique itself. METHODS Suckling rats at day 8 of age underwent intragastric cannulation and were machine fed either a cow's milk-based artificial rat's milk substitute or pooled rat's milk for 4 days. Dam-fed littermates served as a control. RESULTS Body growth did not differ in the three experimental groups. In rats receiving rat's milk substitute, small intestinal wet weight was approximately 60% greater than in rats fed rat's milk or control rats. Additionally, the entire small intestine was approximately 20% longer in the rat's milk substitute group. Morphologically, rat's milk substitute-fed pups demonstrated significantly greater intestinal villus length and crypt depth compared with rat's milk-fed or control rats. Jejunum and midjejunum of the rat's milk and control groups did not differ in these parameters. Intestinal sucrase activity of rat's milk substitute-fed rats was significantly elevated compared with rat's milk-fed rats or control animals. CONCLUSIONS These results indicate that cow's milk-based formula, not gastrostomy or artificial feeding technique, is a principal cause of the small intestine overgrowth and precocious maturation of some intestinal functions observed in artificially reared sucklings.
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Affiliation(s)
- B Dvorak
- Department of Pediatrics and Steele Memorial Children's Research Center, University of Arizona, Tucson 85724-5073, USA
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Kinouchi T, Koizumi K, Kuwata T, Yajima T. Milk-borne insulin with trypsin inhibitor in milk induces pancreatic amylase development at the onset of weaning in rats. J Pediatr Gastroenterol Nutr 2000; 30:515-21. [PMID: 10817281 DOI: 10.1097/00005176-200005000-00010] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
BACKGROUND The physiologic significance of milk-borne hormones and growth factors for internal organs of suckling animals is poorly understood. In this study the significance of milk-borne insulin was evaluated, as well as its combination with trypsin inhibitor, and its role in the development of pancreatic digestive capacity at the time of weaning was investigated. METHODS Experiments were performed using insulin-deficient milk formula (standard formula), insulin (20 ng/ml) formula, or insulin with trypsin inhibitor (1 U/ml) formula by a rat artificial-rearing technique. RESULTS In 17-day-old rats administered standard formula, the plasma insulin level was as low as that in 14-day-old rats. When insulin-trypsin inhibitor formula was administered to rat pups, the plasma insulin level was significantly higher than those in rats given standard or insulin formula. In rats artificially reared on standard formula, the usual developmental increases in pancreatic amylase activity and plasma insulin concentration at the beginning of weaning did not occur. Insulin formula elevated the pups' plasma insulin concentration and amylase activity at the onset of weaning but not to the levels observed in mother-reared rats. In rats reared on insulin-trypsin inhibitor formula, the developmental increases in the plasma insulin concentration and amylase activity observed in mother-reared rats were induced. CONCLUSIONS The present study demonstrates the necessity of milk-borne insulin for the development of pancreatic amylase during the weaning period.
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Affiliation(s)
- T Kinouchi
- Department of Nutritional Research, Nutrition Science Institute, Meiji Milk Products Co., Odawara, Japan
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Kinouchi T, Koizumi K, Kuwata T, Yajima T. Evaluation of the development of intestinal function in rats reared on hydrolyzed or native protein-based milk formula. J Pediatr Gastroenterol Nutr 1999; 29:155-62. [PMID: 10435652 DOI: 10.1097/00005176-199908000-00011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
BACKGROUND In recent years, hydrolyzed protein has often been used as a protein source in food products, including infant formula. In the current study, the effects of different protein sources in milk formula on the development of intestinal function in artificially reared rats were examined. METHODS Rat pups were artificially reared on casein-whey protein-based, whey protein-based, or hydrolyzed whey protein-based milk formula, and the intestinal lactase and maltase activities and the capacity of intestinal immunoglobulin (Ig)G uptake in these rats during the suckling period were determined. RESULTS There were no significant differences in the activities of disaccharidases among the three groups. In the rats reared on hydrolyzed whey protein milk formula, the plasma and jejunal concentrations of human IgG 2 hours after intragastric administration of human IgG were significantly lower than those of rats reared on milk formulas containing native proteins. CONCLUSIONS The present results suggest that the presence of native protein in milk formula and maternal milk may be important for jejunal IgG uptake in suckling rats and the possibility that the presence or absence of native protein in milk formula can modify some developmental processes of the small intestine in suckling animals.
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Affiliation(s)
- T Kinouchi
- Department of Nutritional Research, Nutrition Science Institute, Meiji Milk Products Company, Odawara, Japan
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Kinouchi T, Koizumi K, Kuwata T, Yajima T. Crucial role of milk-borne insulin in the development of pancreatic amylase at the onset of weaning in rats. THE AMERICAN JOURNAL OF PHYSIOLOGY 1998; 275:R1958-67. [PMID: 9843885 DOI: 10.1152/ajpregu.1998.275.6.r1958] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The development of pancreatic amylase activity was examined in rats fed in regular cages or in special cages, designed so the pups could not reach solid food to prevent weaning. In both groups, the amylase activity in zymogen granules increased in rat pups aged 14 days, peaked at 18 days, and thereafter remained at a 1.6-fold higher level than at 14 days of age. An increase in the plasma concentration of immunoreactive insulin preceded the increase of amylase activity, whereas the plasma concentration of C-peptide, indicating the secretion rate of endogenous insulin, remained unchanged. The administration of insulin at 20 ng/ml (the physiological concentration) in the milk formula caused an increase in the plasma insulin concentration of 17-day-old pups. In addition, increased pancreatic amylase activity was observed in 17-day-old rats raised on milk formula to which insulin was added. We propose that the increase of amylase activity at the beginning of weaning is dependent on the milk-borne insulin and not on the dietary change in rats.
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Affiliation(s)
- T Kinouchi
- Laboratory for Gastrointestinal Function, Department of Nutritional Research, Nutrition Science Institute, Meiji Milk Products Company, Limited, Odawara 250-0862, Japan
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Kojima T, Nishimura M, Yajima T, Kuwata T, Suzuki Y, Goda T, Takase S, Harada E. Effect of intermittent feeding on the development of disaccharidase activities in artificially reared rat pups. Comp Biochem Physiol A Mol Integr Physiol 1998; 121:289-97. [PMID: 9972325 DOI: 10.1016/s1095-6433(98)10133-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We investigated the effect of an intermittent feeding schedule on the development of disaccharidase activities in the small intestine of artificially reared (AR) rat pups. Rat pups were fitted with an intragastric cannula at 5 days of age. A milk formula similar to the composition of rat milk was supplied by intermittent gastric infusion over the following 15-19 days. The body weight gain and plasma corticosterone levels of the AR pups matched those of pups reared naturally by dams (MR pups). At 10, 15 and 19 days of age, the small intestine from the ligament to Treitz to the ileocecal junction was divided into three segments of equal length and enzyme activities were measured in each. At the age of 10 and 15 days, sucrase and isomaltase activities were undetectable in AR pups fed according to a controlled schedule from the early postnatal period. These activities were first detected in the middle segment of the small intestine at 9 days of age in both AR and MR pups. Sucrase and isomaltase activities at the age of 19 days were diurnal in AR pups, but arrhythmic in MR pups. We conclude that artificial rearing via the intermittent gastric infusion of a milk formula containing only lactose as the carbohydrate source did not prematurely increase intestinal sucrase and isomaltase activities. Diurnal changes started from the beginning of development of these enzyme activities in AR pups.
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Affiliation(s)
- T Kojima
- United Graduate School of Veterinary Science, Yamaguchi University, Japan.
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Yajima T, Kanno T, Katoku Y, Kuwata T. Gut hypertrophy in response to the ratios of casein and whey protein in milk formulas in artificially reared rat pups. BIOLOGY OF THE NEONATE 1998; 74:314-22. [PMID: 9701654 DOI: 10.1159/000014039] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To elucidate the mechanism of gut hypertrophy observed in rats artificially reared (AR) on milk formulas, the effects of four refined formulas with different ratios of casein (C) and whey protein (W), CW 2:8, CW 4:6, CW 6:4 and CW 8:2, on the gut growth of AR rats were examined. Four groups of pups were infused with each formula through an intragastric cannula from age 5 to 15 days. Each of the four milk formulas showed a different character in the stomach, such as no curd, very soft curd, soft curd and hard curd, in response to an increasing ratio of C:W. There were no significant differences in body weight gain among the AR groups and mother-reared (MR) controls. The stomach growth, in weight, of AR rats increased in response to the increasing ratios of C:W. In comparison with MR controls, hypertrophy of the stomach of AR rats appeared within the formulas with higher proportions of casein than whey protein (CW 6:4 and CW 8:2), but not those with lower proportions (CW 2:8 and CW 4:6). The growth of the small intestine was also related to the increasing ratio of C:W in the formulas. A similar pattern of hypertrophy in the hindgut was seen in AR rats. There was no association between hypertrophy of the gut in AR rats and plasma triiodothyronine. The present results clearly demonstrated that the gut growth of AR rat pups was directly influenced by the diet but not by AR per se, and that hard casein-curd in the stomach might be one cause of gut hypertrophy.
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Affiliation(s)
- T Yajima
- Department of Nutritional Research, Nutrition Science Institute, Meiji Milk Products Co., Ltd., Kanagawa, Japan
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Anzai N, Kawahara K. Renal compensation for body water loss during dehydration in neonatal rats. THE JAPANESE JOURNAL OF PHYSIOLOGY 1998; 48:181-7. [PMID: 9689147 DOI: 10.2170/jjphysiol.48.181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The present study was designed to investigate whether the limited capacity for concentrating urine in neonatal rats is associated with an immature ability to regulate serum osmolality. During milk deprivation, the percent of reduction in body weight per 10 h (mean +/- SE) was 4.3 +/- 0.2, 3.7 +/- 0.1, 4.8 +/- 0.2, and 6.0 +/- 0.1% in 4-, 7-, 10-, and 14-d-old rats, respectively (n = 23-24, each age). The osmolality of urine increased to 718 +/- 12 (4 d), 741 +/- 28 (7 d), 792 +/- 20 (10 d), and 1,203 +/- 41 mosmol/kg H2O (14 d). Free-water absorption (TcH2O) promptly increased after deprivation of milk: It significantly increased from 2.3 +/- 0.3 (0-4 h) to 3.4 +/- 0.1 (4-7 h) (4 d), from 3.1 +/- 0.3 to 4.1 +/- 0.3 (7 d), from 3. 6 +/- 0.4 to 5.2 +/- 0.3 (10 d), and from 5.0 +/- 0.4 to 7.9 +/- 0.7 microliter/min/100 g (14 d). The raised values were maintained at the later period of dehydration. Thus serum osmolality was unchanged throughout dehydration: 287 +/- 1.0 (7 d) and 292 +/- 0.9 mosmol/kg H2O (14 d). On the other hand, the level of serum sodium concentration slightly but significantly increased (r = 0.61) when the body weight reduction was higher than 5% of the control (14-d-old rats). These results indicate that neonatal rats of 4-14 d control their serum osmolality by reabsorbing free water in the kidney during the 10 or 12 h of milk deprivation.
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Affiliation(s)
- N Anzai
- Department of Physiology, Kitasato University School of Medicine, Sagamihara, 228-8555, Japan
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Thompson FM, Catto-Smith AG, Moore D, Davidson G, Cummins AG. Epithelial growth of the small intestine in human infants. J Pediatr Gastroenterol Nutr 1998; 26:506-12. [PMID: 9586760 DOI: 10.1097/00005176-199805000-00004] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Findings in studies in rodents have suggested that epithelial growth of the small intestine is dependent on activation of the immune system. The purpose of this study was to compare changes of postnatal epithelial growth with immunologic activity in humans. METHODS Duodenal biopsies were obtained by endoscopy from 74 infants. Villus area, crypt length, and mitotic count were measured, using a microdissection technique. Enterocyte height, intraepithelial lymphocytes and mucosal mast cells were recorded in histologic sections, and soluble interleukin-2 receptor levels were measured in sera. These data were compared with those from 77 adult control subjects. RESULTS Mean +/- SD villus area was similar in infants compared with that in adults (0.364 +/- 0.108 mm2 vs. 0.339 +/- 0.1 mm2); but mean crypt length was 31% longer (270 +/- 56 microm vs. 206 +/- 29 microm; p < 0.0001), and mitotic count was 68% higher (4.2 +/- 2.8 vs. 2.5 +/- 1 per crypt; p < 0.0001) in infants. Enterocyte height was lower during infancy (27.0 +/- 3.4 microm vs. 30.9 +/- 4.6 microm; p < 0.0001). There was no evidence of a trophic effect on the small intestine of breast feeding compared with the effect of bottle feeding. Counts of intraepithelial lymphocytes but not mucosal mast cells were significantly less in infants. Mean soluble interleukin-2 receptor levels peaked during early infancy, compared with levels in adults (1,820 +/- 596 U/ml vs. 695 +/- 359 U/ml). CONCLUSION These results indicate that epithelial proliferation is increased during infancy at an age when immunologic activity is high.
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Affiliation(s)
- F M Thompson
- Gastroenterology Unit, The Queen Elizabeth Hospital, Woodville South, SA, Australia
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