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Lee NK, Lee Y, Shin DS, Ra J, Choi YM, Ryu BH, Lee J, Park E, Paik HD. Hepatoprotective Effect of Lactiplantibacillus plantarum DSR330 in Mice with High Fat Diet-Induced Nonalcoholic Fatty Liver Disease. J Microbiol Biotechnol 2024; 34:399-406. [PMID: 38247213 PMCID: PMC10940777 DOI: 10.4014/jmb.2310.10026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 11/20/2023] [Accepted: 11/22/2023] [Indexed: 01/23/2024]
Abstract
Lactiplantibacillus plantarum DSR330 (DSR330) has been examined for its antimicrobials production and probiotics. In this study, the hepatoprotective effects of DSR330 were examined against non-alcoholic fatty liver disease (NAFLD) in a high-fat diet (HFD)-fed C57BL/6 mouse model. To induce the development of fatty liver, a HFD was administered for five weeks, and then silymarin (positive control) or DSR330 (108 or 109 CFU/day) was administered along with the HFD for seven weeks. DSR330 significantly decreased body weight and altered serum and hepatic lipid profiles, including a reduction in triglyceride, total cholesterol, and low-density lipoprotein cholesterol levels compared to those in the HFD group. DSR330 significantly alleviated HFD-related hepatic injury by inducing morphological changes and reducing the levels of biomarkers, including AST, ALT, and ALP. Additionally, DSR330 alleviated the expression of SREBP-1c, ACC1, FAS, ACO, PPARα, and CPT-1 in liver cells. Insulin and leptin levels were decreased by DSR330 compared to those observed in the HFD group. However, adiponectin levels were increased, similar to those observed in the ND group. These results demonstrate that L. plantarum DSR330 inhibited HFD-induced hepatic steatosis in mice with NAFLD by modulating various signaling pathways. Hence, the use of probiotics can lead to hepatoprotective effects.
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Affiliation(s)
- Na-Kyoung Lee
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul 05029, Republic of Korea
| | - Yunjung Lee
- Department of Food and Nutrition, Kyungnam University, Changwon 51767, Republic of Korea
| | - Da-Soul Shin
- Department of Food and Nutrition, Kyungnam University, Changwon 51767, Republic of Korea
| | - Jehyeon Ra
- FM MI center, Daesang Wellife, Seoul 03130, Republic of Korea
| | - Yong-Min Choi
- FM MI center, Daesang Wellife, Seoul 03130, Republic of Korea
| | - Byung Hee Ryu
- Jongga R&D product Division, Daesang, Seoul 03130, Republic of Korea
| | - Jinhyeuk Lee
- FM MI center, Daesang Wellife, Seoul 03130, Republic of Korea
| | - Eunju Park
- Department of Food and Nutrition, Kyungnam University, Changwon 51767, Republic of Korea
| | - Hyun-Dong Paik
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul 05029, Republic of Korea
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Kim SA, Lee DH, Ryu BH, Han NS. Strain-specific barcode PCR and quantitative PCR assay for identification and enumeration of kimchi starter, Leuconostoc mesenteroides DRC1506. Lebensm Wiss Technol 2023. [DOI: 10.1016/j.lwt.2023.114460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Kim J, Ahn SW, Kim JY, Whon TW, Lim SK, Ryu BH, Han NS, Choi HJ, Roh SW, Lee SH. Probiotic Lactobacilli ameliorate alcohol-induced hepatic damage via gut microbial alteration. Front Microbiol 2022; 13:869250. [PMID: 36081800 PMCID: PMC9446534 DOI: 10.3389/fmicb.2022.869250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 07/20/2022] [Indexed: 11/13/2022] Open
Abstract
Alcoholic liver disease (ALD), which includes fatty liver, cirrhosis, steatosis, fibrosis, and hepatocellular carcinoma, is a global health problem. The probiotic effects of lactic acid bacteria (LAB) are well-known; however, their protective effect against ALD remains unclear. Therefore, in this study, our objective was to assess the protective effects of LAB on ALD. To this end, mice were fed either a normal diet or an alcohol diet for 10 days (to induce ALD) accompanied by vehicle treatment (the NC and AC groups) or kimchi-derived LAB (Lactiplantibacillus plantarum DSR J266 and Levilactobacillus brevis DSR J301, the AL group; or Lacticaseibacillus rhamnosus GG, the AG group). Our results showed that mice in the AC group showed significantly higher serum aspartate aminotransferase and alanine aminotransferase levels than those in the normal diet groups; however, their levels in the AL and AG groups were relatively lower. We also observed that the AL and AG groups showed relatively lower interleukin-6 levels than the AC group. Additionally, AC group showed the accumulation of several fat vesicles in the liver, while the AL and AG groups showed remarkably lower numbers of fat vesicles. The relative abundance of Enterococcus feacalis, which showed association with liver injury, significantly increased in the AC group compared with its levels in the normal diet groups. However, the AG group showed a decreased relative abundance in this regard, confirming that LAB exerted an improvement effect on gut microbial community. These findings suggested that via gut microbiota alteration, the ingestion of LAB can alleviate the ill effects of alcohol consumption, including inflammation, liver damage, gut dysbiosis, and abnormal intestinal nutrient metabolism.
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Affiliation(s)
- Juseok Kim
- Kimchi Functionality Research Group, World Institute of Kimchi, Gwangju, South Korea
- Microbiome Research Team, LISCure Biosciences Inc., Seongnam, South Korea
| | - Seong Woo Ahn
- Kimchi Functionality Research Group, World Institute of Kimchi, Gwangju, South Korea
- Microbiome Research Team, LISCure Biosciences Inc., Seongnam, South Korea
| | - Joon Yong Kim
- Kimchi Functionality Research Group, World Institute of Kimchi, Gwangju, South Korea
- Microbiome Research Team, LISCure Biosciences Inc., Seongnam, South Korea
| | - Tae Woong Whon
- Kimchi Functionality Research Group, World Institute of Kimchi, Gwangju, South Korea
| | - Seul Ki Lim
- Fermentation Regulation Technology Research Group, World Institute of Kimchi, Gwangju, South Korea
| | - Byung Hee Ryu
- Food Research Division, Food BU, Daesang Corporation Research Institute, Icheon, South Korea
| | - Nam Soo Han
- Department of Food Science and Biotechnology, Brain Korea 21 Center for Bio-Health Industry, Chungbuk National University, Cheongju, South Korea
| | - Hak-Jong Choi
- Kimchi Functionality Research Group, World Institute of Kimchi, Gwangju, South Korea
| | - Seong Woon Roh
- Kimchi Functionality Research Group, World Institute of Kimchi, Gwangju, South Korea
- Microbiome Research Team, LISCure Biosciences Inc., Seongnam, South Korea
| | - Se Hee Lee
- Kimchi Functionality Research Group, World Institute of Kimchi, Gwangju, South Korea
- *Correspondence: Se Hee Lee,
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Seo H, Seong H, Kim GY, Jo YM, Cheon SW, Song Y, Ryu BH, Kang H, Han NS. Development of Anti-inflammatory Probiotic Limosilactobacillus reuteri EFEL6901 as Kimchi Starter: in vitro and In vivo Evidence. Front Microbiol 2021; 12:760476. [PMID: 34899643 PMCID: PMC8656428 DOI: 10.3389/fmicb.2021.760476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 11/03/2021] [Indexed: 11/13/2022] Open
Abstract
The use of probiotic starters can improve the sensory and health-promoting properties of fermented foods. In this study, we developed an anti-inflammatory probiotic starter, Limosilactobacillus reuteri EFEL6901, for use in kimchi fermentation. The EFEL6901 strain was safe for use in foods and was stable under human gastrointestinal conditions. In in vitro experiments, EFEL6901 cells adhered well to colonic epithelial cells and decreased nitric oxide production in lipopolysaccharide-induced macrophages. In in vivo experiments, oral administration of EFEL6901 to DSS-induced colitis mice models significantly alleviated the observed colitis symptoms, prevented body weight loss, lowered the disease activity index score, and prevented colon length shortening. Analysis of these results indicated that EFEL6901 played a probiotic role by preventing the overproduction of pro-inflammatory cytokines, improving gut barrier function, and up-regulating the concentrations of short-chain fatty acids. In addition, EFEL6901 made a fast growth in a simulated kimchi juice and it synthesized similar amounts of metabolites in nabak-kimchi comparable to a commercial kimchi. This study demonstrates that EFEL6901 can be used as a suitable kimchi starter to promote gut health and product quality.
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Affiliation(s)
- Hee Seo
- Brain Korea 21 Center for Bio-Resource Development, Division of Animal, Horticultural, and Food Sciences, Chungbuk National University, Cheongju, South Korea
| | - Hyunbin Seong
- Brain Korea 21 Center for Bio-Resource Development, Division of Animal, Horticultural, and Food Sciences, Chungbuk National University, Cheongju, South Korea
| | - Ga Yun Kim
- Brain Korea 21 Center for Bio-Resource Development, Division of Animal, Horticultural, and Food Sciences, Chungbuk National University, Cheongju, South Korea
| | - Yu Mi Jo
- Brain Korea 21 Center for Bio-Resource Development, Division of Animal, Horticultural, and Food Sciences, Chungbuk National University, Cheongju, South Korea
| | - Seong Won Cheon
- Brain Korea 21 Center for Bio-Resource Development, Division of Animal, Horticultural, and Food Sciences, Chungbuk National University, Cheongju, South Korea
| | - Youngju Song
- Department of Biomedical Science and Technology, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Byung Hee Ryu
- Fresh Food Research Division, Food BU, Daesang Corporation Research Institute, Icheon, South Korea
| | - Hee Kang
- Humanitas College, Kyung Hee University, Yongin, South Korea
| | - Nam Soo Han
- Brain Korea 21 Center for Bio-Resource Development, Division of Animal, Horticultural, and Food Sciences, Chungbuk National University, Cheongju, South Korea
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Lee J, Jang JY, Kwon MS, Lim SK, Kim N, Lee J, Park HK, Yun M, Shin MY, Jo HE, Oh YJ, Ryu BH, Ko MY, Joo W, Choi HJ. Mixture of Two Lactobacillus plantarum Strains Modulates the Gut Microbiota Structure and Regulatory T Cell Response in Diet-Induced Obese Mice. Mol Nutr Food Res 2018; 62:e1800329. [PMID: 30362639 DOI: 10.1002/mnfr.201800329] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 10/15/2018] [Indexed: 12/25/2022]
Abstract
SCOPE The gut microbiota has been linked to diet-induced obesity, and microorganisms that influence obesity have important health implications. In this study, the anti-obesity effects of two Lactobacillus plantarum strains (DSR M2 and DSR 920) isolated from kimchi are investigated. METHODS AND RESULTS Mice are fed a normal or high-fat diet with or without DSR M2 and DSR 920 (DSR, 1 × 109 CFU d-1 ) for 12 weeks. DSR improves the obesity state, as evidenced by the i) suppressed obesity-related markers, e.g., gains in body weight and fat mass, ii) reduced serum and liver triglyceride levels, iii) upregulated β-oxidation and downregulated lipogenesis-related genes in the liver, iv) reduced serum leptin levels, v) altered microbial communities, vi) increased regulatory T cell immunity, and vii) suppressed inflammatory response. In addition, correlation analysis shows that Akkermansia muciniphila and the genus Anaerostipes, which are increased in the DSR group, are negatively correlated with obesity-related markers, but Mucispirillum schaedleri, which is increased in the high-fat-diet (HFD) group, is positively correlated with serum leptin level. CONCLUSION Lactobacillus plantarum DSR M2 and DSR 920 are candidate probiotics for the prevention and amelioration of obesity.
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Affiliation(s)
- Jieun Lee
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea
| | - Ja-Young Jang
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea
| | - Min-Sung Kwon
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea
| | - Seul Ki Lim
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea
| | - Namhee Kim
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea
| | - Jihyun Lee
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea
| | - Hyo Kyeong Park
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea
| | - Misun Yun
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea
| | - Mi-Young Shin
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea.,Division of Animal Science, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Hee Eun Jo
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea.,Division of Animal Science, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Young Joon Oh
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea
| | - Byung Hee Ryu
- Fresh Food Research Division, Food BU, Daesang Corporation Research Institute, lcheon, 17384, Republic of Korea
| | - Mi Yeon Ko
- Fresh Food Research Division, Food BU, Daesang Corporation Research Institute, lcheon, 17384, Republic of Korea
| | - Wooha Joo
- Fresh Food Research Division, Food BU, Daesang Corporation Research Institute, lcheon, 17384, Republic of Korea
| | - Hak-Jong Choi
- Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Republic of Korea
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Jeon HH, Kim KH, Chun BH, Ryu BH, Han NS, Jeon CO. A proposal of Leuconostoc mesenteroides subsp. jonggajibkimchii subsp. nov. and reclassification of Leuconostoc mesenteroides subsp. suionicum (Gu et al., 2012) as Leuconostoc suionicum sp. nov. based on complete genome sequences. Int J Syst Evol Microbiol 2017; 67:2225-2230. [PMID: 28671527 DOI: 10.1099/ijsem.0.001930] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The type strains of four subspecies of Leuconostocmesenteroides, L. mesenteroidessubsp. mesenteroides, L. mesenteroidessubsp. cremoris, L. mesenteroidessubsp. dextranicum and L. mesenteroidessubsp. suionicum, and strain DRC1506T, used as a starter culture for commercial kimchi production in Korea, were phylogenetically analyzed on the basis of their complete genome sequences. Although the type strains of the four L. mesenteroides subspecies and strain DRC1506T shared very high 16S rRNA gene sequence similarities (>99.72 %), the results of analysis of average nucleotide identity (ANI), in silico DNA-DNA hybridization (DDH) and core-genome-based relatedness indicated that they could form five different phylogenetic lineages. The type strains of L. mesenteroidessubsp. mesenteroides, L. mesenteroidessubsp. cremoris and L. mesenteroidessubsp. dextranicum and DRC1506T shared higher ANI and in silico DDH values than the thresholds (95-96 % and 70 %, respectively) generally accepted for different species delineation, whereas the type strain of L. mesenteroidessubsp. suionicum (DSM 20241T) shared lower ANI (<94.1 %) and in silico DDH values (<57.0 %) with the other four L. mesenteroides lineage strains, indicating that DSM 20241T couldn be reclassified as representing a different species. Here, we report that DRC1506T represents a novel subspecies within the species Leuconostoc mesenteroides, for which the name Leuconostoc mesenteroidessubsp. jonggajibkimchii subsp. nov. is proposed. The type strain is DRC1506T (=KCCM 43249T=JCM 31787T). In addition, L. mesenteroidessubsp. suionicum is also reclassified as Leuconostoc suionicum. sp. nov. (type strain DSM 20241T=ATCC 9135T=LMG 8159T=NCIMB 6992T).
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Affiliation(s)
- Hye Hee Jeon
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Kyung Hyun Kim
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Byung Hee Chun
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Byung Hee Ryu
- Department of Fresh Food Research, Division of Research and Technology, Daesang Co., Ltd, Seoul 02586, Republic of Korea
| | - Nam Soo Han
- Brain Korea 21 Center for Bio-Resource Development, Division of Animal, Horticultural, and Food Sciences, Chungbuk National University, Cheongju 28644, Republic of Korea
| | - Che Ok Jeon
- Department of Life Science, Chung-Ang University, Seoul 06974, Republic of Korea
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Abstract
Arterial unesterified cholesterol, phospholipid particles have been isolated from atherosclerotic lesions and characterized. However, the role of these 'liposomes' in macrophage foam cell formation is unclear. Recently, LDL, after trypsin and cholesteryl esterase treatment (T/CE LDL), was shown to have physical properties similar to the unesterified cholesterol, phospholipid particles isolated from atherosclerotic lesions. Yet, when mouse peritoneal macrophages were incubated with these model particles in culture medium (DMEM and 5% LPDS), only an insignificant accumulation of cellular cholesteryl esters was observed. Previously, we demonstrated that complex formation between unesterified cholesterol, phosphatidylcholine liposomes and cupric sulfate-oxidized LDL dramatically enhances the ability of the liposomes to augment cellular cholesterol accretion (Greenspan P, Yu H, Mao F, Gutman RL. J Lipid Res 1997;38:101-109). When T/CE LDL, another cholesterol-rich phospholipid particle, was substituted for unesterified cholesterol phosphatidylcholine liposomes in our complex, mouse peritoneal macrophages accumulated a significant amount of both cellular unesterifed cholesterol (61 microg/mg cell protein) and cholesteryl esters (76 microg/mg cell protein) after 48 h of incubation. These results demonstrate again that the interaction of two cholesterol-bearing particles (T/CE LDL and oxidized LDL), which individually can not promote significant cholesterol accumulation in cells, will, when combined, produce macrophage foam cells.
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Affiliation(s)
- H Yu
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens 30602, USA
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Greenspan P, Yu H, Gutman RL, Mao F, Ryu BH, Lou P. Iron-ascorbate-phospholipid mediated modification of low density lipoprotein. Biochim Biophys Acta 1996; 1301:242-8. [PMID: 8664335 DOI: 10.1016/0005-2760(96)00049-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
LDL can be oxidized by a variety of agents to form a modified lipoprotein which is capable of being avidly metabolized by macrophages. While previous in vitro studies have focused exclusively on the oxidation of LDL, other lipids found in the atheroma are also subject to oxidation and its lipoperoxide byproducts may contribute to the process of LDL modification. To examine the relationship between the oxidation of phospholipids and the subsequent modification of LDL, we incubated 250 microM phosphatidylcholine with 10 microM ferrous sulfate and 50 microM ascorbic acid in 10 mM Tris (pH 7.0). After 18 h at 37 degrees C, significant amounts of thiobarbituric acid reactive substances (TBARS) were formed. The inclusion of LDL (100 micrograms protein/ml) elevated the TBARS and increased the electrophoretic mobility of the lipoprotein. LDL treated with iron and ascorbate in the absence of phosphatidylcholine did not result in the modification of this lipoprotein. LDL that was incubated with phosphatidylcholine, iron and ascorbate was found to be metabolized by macrophages to a far greater extent than native LDL or LDL treated with phosphatidylcholine alone. Probucol (10 microM) inhibited the LDL modification process. These results demonstrate that while iron and ascorbate cannot oxidize LDL directly, the addition of phosphatidylcholine to these initiators of lipid peroxidation can mediate and lead to the modification of LDL.
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Affiliation(s)
- P Greenspan
- Department of Pharmacology and Toxicology, School of Pharmacy, University of Georgia, Athens 30602, USA
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Ryu BH, Mao FW, Lou P, Gutman RL, Greenspan P. Cholesteryl ester accumulation in macrophages treated with oxidized low density lipoprotein. Biosci Biotechnol Biochem 1995; 59:1619-22. [PMID: 8520107 DOI: 10.1271/bbb.59.1619] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The ability of CuSO4- and hypochlorite-oxidized LDL to promote cholesterol accumulation in macrophages was examined. Both CuSO4- and hypochlorite-oxidized LDL were rapidly metabolized by mouse peritoneal macrophages to a level approximately 10 times that observed for native LDL and both modified lipoproteins increased the accumulation of unesterified cholesterol. However when each modified lipoprotein was incubated with macrophages for 40h, only hypochlorite-oxidized LDL produced significant accumulation of cholesteryl esters, with levels approaching 85 micrograms/mg cell protein. This finding was verified by nile red staining. The cholesteryl ester content of cupric sulfate-modified LDL was found to be significantly decreased when compared to either native or hypochlorite-modified LDL promotes massive cholesteryl ester accumulation because the cholesteryl ester content of the LDL particle is preserved.
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Affiliation(s)
- B H Ryu
- University of Georgia, College of Pharmacy, Department of Pharmacology and Toxicology, Athens 30602, USA
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Greenspan P, Ryu BH, Mao F, Gutman RL. Association of negatively-charged phospholipids with low-density lipoprotein (LDL) increases its uptake and the deposition of cholesteryl esters by macrophages. Biochim Biophys Acta 1995; 1257:257-64. [PMID: 7647101 DOI: 10.1016/0005-2760(95)00088-t] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
LDL, the major carrier of cholesterol in blood, is poorly metabolized by macrophages. In contrast, macrophages can recognize and endocytose anionic phospholipids such as phosphatidylserine, phosphatidylglycerol and cardiolipin. Since macrophages can take up large amounts of these phospholipids, experiments were performed to ascertain whether pre-incubation of native LDL with negatively-charged phospholipids would enhance the metabolism of LDL by macrophages. When 125I-LDL was incubated with cardiolipin liposomes for 18 h at 37 degrees C before addition to macrophages, an approx. 40-fold increase of LDL metabolism by these cells was observed. Similar results were found when LDL was pre-incubated with phosphatidylserine or phosphatidylglycerol; however, pre-incubation of LDL with phosphatidylcholine liposomes did not lead to an increase of LDL metabolism. The macrophage uptake of LDL pre-incubated with cardiolipin was reduced to approx. 40% of control values in the presence of dextran sulfate and fucoidin, inhibitors of anionic phospholipid uptake. Cytochalasin D, an inhibitor of phagocytosis, reduced the lysosomal degradation of LDL pre-incubated with cardiolipin to approx. 10% of control values. When the LDL-cardiolipin mixture was chromatographed on agarose gel, two peaks containing LDL were observed in the elution profile: the first peak appeared at the void volume and the second peak was detected just ahead of native LDL. The LDL in both peaks was much more extensively metabolized by macrophages than was native LDL; the LDL in the first peak was metabolized at a rate that was 8 times the second peak. The results demonstrate that negatively-charged phospholipids can form a complex with LDL which facilitates its phagocytosis by macrophages.
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Affiliation(s)
- P Greenspan
- University of Georgia, College of Pharmacy, Department of Pharmacology and Toxicology, Athens 30602, USA
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11
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Abstract
Agarose gel electrophoresis has been extensively employed by researchers to gain a greater understanding of lipoprotein biology and its relationship to cardiovascular disease. Advances in this technique have been made in the visualization and quantitation of separated lipoproteins, in the use of agarose gel electrophoresis for detection and quantitation of apolipoproteins of the separated lipoproteins, and in the detection of lipoprotein heterogeneity. Agarose gel electrophoresis has been employed for two-dimensional electrophoretic analysis of lipoproteins as well as in several different methods which probe the immunological properties of lipoproteins. Agarose gel electrophoresis has thus become an important tool in the study of serum lipoproteins in both clinical and basic science laboratories.
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Affiliation(s)
- P Greenspan
- Department of Pharmacology and Toxicology, School of Pharmacy, University of Georgia, Athens 30602, USA
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Sugino A, Ryu BH, Sugino T, Naumovski L, Friedberg EC. A new DNA-dependent ATPase which stimulates yeast DNA polymerase I and has DNA-unwinding activity. J Biol Chem 1986; 261:11744-50. [PMID: 3017945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Two forms of DNA-dependent ATPase activity were previously purified from the yeast Saccharomyces cerevisiae and characterized (Plevani, P., Badaracco, G., and Chang, L. M. S. (1980) J. Biol. Chem. 255, 4957-4963). Here, an additional DNA-dependent ATPase (ATPase III) has been purified from S. cerevisiae to near homogeneity. This ATPase differs from those described previously in its chromatographic properties, molecular weight, reaction properties and immunological relatedness. Its molecular weight is about 63,000 in the presence of sodium dodecyl sulfate. It hydrolyzes ATP to ADP and orthophosphate in the presence of DNA as an effector. In addition, yeast DNA polymerase I, which is a true DNA replicase of yeast, is stimulated severalfold by this ATPase. Neither yeast DNA polymerase II nor prokaryotic DNA polymerases are stimulated. This stimulation is intrinsic to the ATPase activity, since both activities copurified in the last four steps of purification, showed the same heat stability and showed dependence on and hydrolysis of ATP. The ATPase III preparation also contains a DNA-unwinding (DNA helicase) activity, which unwinds double-stranded DNA in the presence of ATP. In the S. cerevisiae radiation-sensitive mutant rad3, no significant ATPase III activity could be detected, suggesting that the RAD3 gene, which codes for a different polypeptide, regulates the expression of ATPase III activity.
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Sugino A, Ryu BH, Sugino T, Naumovski L, Friedberg EC. A new DNA-dependent ATPase which stimulates yeast DNA polymerase I and has DNA-unwinding activity. J Biol Chem 1986. [DOI: 10.1016/s0021-9258(18)67306-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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