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  1. Book: Prostaglandin D 2 synthase

    Ragolia, Louis

    a multitude of biological functions

    2007  

    Author's details ed. Louis Ragolia
    Language English
    Size 209 S. : Ill., graph. Darst.
    Publisher Research Signpost
    Publishing place Trivandrum
    Publishing country India
    Document type Book
    HBZ-ID HT015632675
    ISBN 978-81-308-0186-5 ; 81-308-0186-8
    Database Catalogue ZB MED Medicine, Health

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  2. Article ; Online: Beyond Measure: Navigating the Complexities of Limb Length Optimization in Roux-en-Y Gastric Bypass Surgery.

    Stevenson, Matthew / Lau, Raymond / Brathwaite, Collin E M / Ragolia, Louis

    Obesity surgery

    2024  

    Language English
    Publishing date 2024-05-14
    Publishing country United States
    Document type Letter
    ZDB-ID 1070827-3
    ISSN 1708-0428 ; 0960-8923
    ISSN (online) 1708-0428
    ISSN 0960-8923
    DOI 10.1007/s11695-024-07284-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Lipocalin-type Prostaglandin D2 Synthase appears to function as a Novel Adipokine Preventing Adipose Dysfunction in response to a High Fat Diet.

    Srivastava, Ankita / Palaia, Thomas / Hall, Christopher / Stevenson, Matthew / Lee, Jenny / Ragolia, Louis

    Prostaglandins & other lipid mediators

    2021  Volume 157, Page(s) 106585

    Abstract: Adipose dysfunction is the primary defect in obesity that contributes to the development of dyslipidemia, insulin resistance, cardiovascular diseases, type 2 diabetes, non-alcoholic fatty liver disease (NAFLD) and some cancers. Previously, we ... ...

    Abstract Adipose dysfunction is the primary defect in obesity that contributes to the development of dyslipidemia, insulin resistance, cardiovascular diseases, type 2 diabetes, non-alcoholic fatty liver disease (NAFLD) and some cancers. Previously, we demonstrated the development of NAFLD in lipocalin-type prostaglandin D
    MeSH term(s) 3T3-L1 Cells ; Adipokines/metabolism ; Adipose Tissue/metabolism ; Animals ; Diabetes Mellitus, Type 2 ; Diet, High-Fat/adverse effects ; Insulin Resistance ; Intramolecular Oxidoreductases ; Lipocalins/genetics ; Lipocalins/metabolism ; Mice ; Mice, Inbred C57BL
    Chemical Substances Adipokines ; Lipocalins ; Intramolecular Oxidoreductases (EC 5.3.-) ; prostaglandin R2 D-isomerase (EC 5.3.99.2)
    Language English
    Publishing date 2021-08-08
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1426962-4
    ISSN 2212-196X ; 1098-8823 ; 0090-6980
    ISSN (online) 2212-196X
    ISSN 1098-8823 ; 0090-6980
    DOI 10.1016/j.prostaglandins.2021.106585
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book: Prostaglandin D2 synthase

    Ragolia, Louis

    a multitude of biological functions, 2007

    2007  

    Author's details editor, Louis Ragolia
    MeSH term(s) Lipocalins
    Language English
    Size 209 p. :, ill.
    Publisher Research Signpost
    Publishing place Kerala, India
    Document type Book
    ISBN 9788130801865 ; 8130801868
    Database Catalogue of the US National Library of Medicine (NLM)

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  5. Article ; Online: Reversal of NAFLD After VSG Is Independent of Weight-Loss but RYGB Offers More Efficacy When Maintained on a High-Fat Diet.

    Srivastava, Ankita / Stevenson, Matthew / Lee, Jenny / Hall, Christopher / Palaia, Thomas / Zhao, Chaohui Lisa / Lau, Raymond / Brathwaite, Collin / Ragolia, Louis

    Obesity surgery

    2022  Volume 32, Issue 6, Page(s) 2010–2022

    Abstract: Purpose: Bariatric surgery is emerging as an effective treatment for obesity and the metabolic syndrome. Recently, we demonstrated that Roux-en-Y gastric bypass (RYGB), but not vertical sleeve gastrectomy (VSG), resulted in improvements to white adipose ...

    Abstract Purpose: Bariatric surgery is emerging as an effective treatment for obesity and the metabolic syndrome. Recently, we demonstrated that Roux-en-Y gastric bypass (RYGB), but not vertical sleeve gastrectomy (VSG), resulted in improvements to white adipose physiology and enhanced brown adipose functioning. Since beneficial alterations to liver health are also expected after bariatric surgery, comparing the post-operative effects of RYGB and VSG on liver physiology is essential to their application in the treatment of non-alcoholic fatty liver disease (NAFLD).
    Materials and methods: The effects of RYGB and VSG on liver physiology were compared using diet induced mouse model of obesity. High-fat diet (HFD) was administered for 12 weeks after surgery and alterations to liver physiology were assessed.
    Results: Both RYGB and VSG showed decreased liver weight as well as reductions to hepatic cholesterol and triglyceride levels. There were demonstrable improvements to NAFLD activity score (NAS) and fibrosis stage scoring after both surgeries. In RYGB, these beneficial changes to liver function resulted from the downregulation of pro-fibrotic and upregulation anti-fibrotic genes, as well as increased fatty acid oxidation and bile acid flux. For VSG, though similar alterations were observed, they were less potent. However, VSG did significantly downregulate pro-fibrotic genes and showed increased glycogen content paralleled by decreased glycogenolysis which may have contributed to the resolution of NAFLD.
    Conclusion: RYGB and VSG improve liver physiology and function, but RYGB is more efficacious. Resolutions of NAFLD in RYGB and VSG are achieved through different processes, independent of weight loss.
    MeSH term(s) Animals ; Diet, High-Fat ; Gastrectomy/methods ; Gastric Bypass/methods ; Humans ; Mice ; Non-alcoholic Fatty Liver Disease/etiology ; Non-alcoholic Fatty Liver Disease/surgery ; Obesity/surgery ; Obesity, Morbid/surgery
    Language English
    Publishing date 2022-04-14
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1070827-3
    ISSN 1708-0428 ; 0960-8923
    ISSN (online) 1708-0428
    ISSN 0960-8923
    DOI 10.1007/s11695-022-06053-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: The Effect of Diet Composition on the Post-operative Outcomes of Roux-en-Y Gastric Bypass in Mice.

    Stevenson, Matthew / Srivastava, Ankita / Nacher, Maria / Hall, Christopher / Palaia, Thomas / Lee, Jenny / Zhao, Chaohui Lisa / Lau, Raymond / Ali, Mohamed A E / Park, Christopher Y / Schlamp, Florencia / Heffron, Sean P / Fisher, Edward A / Brathwaite, Collin / Ragolia, Louis

    Obesity surgery

    2024  Volume 34, Issue 3, Page(s) 911–927

    Abstract: Purpose: Roux-en-Y gastric bypass (RYGB) leads to the improvement of many obesity-associated conditions. The degree to which post-operative macronutrient composition contributes to metabolic improvement after RYGB is understudied.: Methods: A mouse ... ...

    Abstract Purpose: Roux-en-Y gastric bypass (RYGB) leads to the improvement of many obesity-associated conditions. The degree to which post-operative macronutrient composition contributes to metabolic improvement after RYGB is understudied.
    Methods: A mouse model of RYGB was used to examine the effects of diet on the post-operative outcomes of RYGB. Obese mice underwent either Sham or RYGB surgery and were administered either chow or HFD and then monitored for an additional 8 weeks.
    Results: After RYGB, reductions to body weight, fat mass, and lean mass were similar regardless of diet. RYGB and HFD were independently detrimental to bone mineral density and plasma vitamin D levels. Independent of surgery, HFD accelerated hematopoietic stem and progenitor cell proliferation and differentiation and exhibited greater myeloid lineage commitment. Independent of diet, systemic iron deficiency was present after RYGB. In both Sham and RYGB groups, HFD increased energy expenditure. RYGB increased fecal energy loss, and HFD after RYGB increased fecal lipid content. RYGB lowered fasting glucose and liver glycogen levels but HFD had an opposing effect. Indices of insulin sensitivity improved independent of diet. HFD impaired improvements to dyslipidemia, NAFLD, and fibrosis.
    Conclusion: Post-operative diet plays a significant role in determining the degree to which RYGB reverses obesity-induced metabolic abnormalities such as hyperglycemia, dyslipidemia, and NAFLD. Diet composition may be targeted in order to assist in the treatment of post-RYGB bone mineral density loss and vitamin D deficiency as well as to reverse myeloid lineage commitment. HFD after RYGB continues to pose a significant multidimensional health risk.
    MeSH term(s) Mice ; Animals ; Non-alcoholic Fatty Liver Disease ; Gastric Bypass/methods ; Obesity, Morbid/surgery ; Obesity/surgery ; Obesity/metabolism ; Diet, High-Fat ; Dyslipidemias
    Language English
    Publishing date 2024-01-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1070827-3
    ISSN 1708-0428 ; 0960-8923
    ISSN (online) 1708-0428
    ISSN 0960-8923
    DOI 10.1007/s11695-023-07052-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Correction: The Effect of Diet Composition on the Post-operative Outcomes of Roux-en-Y Gastric Bypass in Mice.

    Stevenson, Matthew / Srivastava, Ankita / Nacher, Maria / Hall, Christopher / Palaia, Thomas / Lee, Jenny / Zhao, Chaohui Lisa / Lau, Raymond / Ali, Mohamed A E / Park, Christopher Y / Schlamp, Florencia / Heffron, Sean P / Fisher, Edward A / Brathwaite, Collin / Ragolia, Louis

    Obesity surgery

    2024  Volume 34, Issue 3, Page(s) 928

    Language English
    Publishing date 2024-01-18
    Publishing country United States
    Document type Published Erratum
    ZDB-ID 1070827-3
    ISSN 1708-0428 ; 0960-8923
    ISSN (online) 1708-0428
    ISSN 0960-8923
    DOI 10.1007/s11695-024-07064-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: DP1 receptor agonist, BW245C inhibits diet-induced obesity in ApoE

    Kumar, Sunil / Palaia, Thomas / Hall, Christopher / Ragolia, Louis

    Obesity research & clinical practice

    2017  Volume 12, Issue 2, Page(s) 229–241

    Abstract: Background/objective: Lipocalin Prostaglandin D2 synthase (LPGDS) contributes to the production of PGD2, which has been associated with adipogenesis. In this study, we aimed to investigate the role of PGD2 on obesity through its DP1 and DP2 receptor ... ...

    Abstract Background/objective: Lipocalin Prostaglandin D2 synthase (LPGDS) contributes to the production of PGD2, which has been associated with adipogenesis. In this study, we aimed to investigate the role of PGD2 on obesity through its DP1 and DP2 receptor signaling using intraperitoneal injection of their respective agonists and antagonists.
    Methods: ApoE
    Results: Despite being on high fat diet, mice receiving DP1 receptor agonist sustained a significant inhibition of weight gain throughout the study gaining only 11.4% body weight compared to the controls gaining 61% body weight. Interestingly, parallel to the body weight, the DP1 receptor agonist group showed a significant reduction in food intake throughout the study. Consistently, fasting leptin, insulin and bile acids levels were elevated in the DP1 receptor agonist group compared to controls. As expected, there was a significant reduction in fasting glucose level in DP1 receptor agonist group. At last, as a result of weight gain inhibition, DP1 receptor agonist also imparted cardiovascular benefits showing significant reduction in aortic wall thickness, intima, adventia and lumen size.
    Conclusion: Based on the obtained results, we believe DP1 receptor agonism inhibited diet induced weight gain possibly through controlling appetite which consequently imparted beneficial cardiometabolic effects. DP1 receptor agonism may represent a novel therapeutic target for the management of obesity.
    MeSH term(s) Animals ; Apolipoproteins E/deficiency ; Apolipoproteins E/genetics ; Appetite Depressants/pharmacology ; Diet/adverse effects ; Disease Models, Animal ; Hydantoins/pharmacology ; Injections, Intraperitoneal ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; Obesity/etiology ; Obesity/pathology ; Obesity/prevention & control ; Prostaglandin D2 ; Receptors, Immunologic/agonists ; Receptors, Prostaglandin/agonists ; Weight Gain/drug effects ; Weight Gain/physiology
    Chemical Substances Apolipoproteins E ; Appetite Depressants ; Hydantoins ; Receptors, Immunologic ; Receptors, Prostaglandin ; BW 245C (75693-75-3) ; Prostaglandin D2 (RXY07S6CZ2) ; prostaglandin D2 receptor (XZF106QU24)
    Language English
    Publishing date 2017-06-08
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2274031-4
    ISSN 1878-0318 ; 1871-403X
    ISSN (online) 1878-0318
    ISSN 1871-403X
    DOI 10.1016/j.orcp.2017.05.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Underestimation of SARS-CoV-2 infection in placental samples.

    Hanna, Nazeeh / Lin, Xinhua / Thomas, Kristen / Vintzileos, Anthony / Chavez, Martin / Palaia, Thomas / Ragolia, Louis / Verma, Sourabh / Khullar, Poonam / Hanna, Iman

    American journal of obstetrics and gynecology

    2021  Volume 225, Issue 5, Page(s) 572–575.e1

    MeSH term(s) Adult ; Angiotensin-Converting Enzyme 2/genetics ; COVID-19/virology ; Female ; Humans ; Placenta/virology ; Pregnancy ; Pregnancy Complications, Infectious/virology ; SARS-CoV-2/isolation & purification ; Serine Endopeptidases/genetics ; Spike Glycoprotein, Coronavirus/analysis
    Chemical Substances Spike Glycoprotein, Coronavirus ; spike protein, SARS-CoV-2 ; ACE2 protein, human (EC 3.4.17.23) ; Angiotensin-Converting Enzyme 2 (EC 3.4.17.23) ; Serine Endopeptidases (EC 3.4.21.-) ; TMPRSS2 protein, human (EC 3.4.21.-)
    Language English
    Publishing date 2021-07-21
    Publishing country United States
    Document type Case Reports ; Letter ; Research Support, N.I.H., Extramural
    ZDB-ID 80016-8
    ISSN 1097-6868 ; 0002-9378
    ISSN (online) 1097-6868
    ISSN 0002-9378
    DOI 10.1016/j.ajog.2021.07.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: RYGB Is More Effective than VSG at Protecting Mice from Prolonged High-Fat Diet Exposure: An Occasion to Roll Up Our Sleeves?

    Stevenson, Matthew / Srivastava, Ankita / Lee, Jenny / Hall, Christopher / Palaia, Thomas / Lau, Raymond / Brathwaite, Collin / Ragolia, Louis

    Obesity surgery

    2021  Volume 31, Issue 7, Page(s) 3227–3241

    Abstract: Purpose: Understanding the effects of Roux-en-Y gastric bypass (RYGB) and vertical sleeve gastrectomy (VSG) on adipose tissue physiology is important for the treatment of obesity-related metabolic disorders. By using robust mouse models of bariatric ... ...

    Abstract Purpose: Understanding the effects of Roux-en-Y gastric bypass (RYGB) and vertical sleeve gastrectomy (VSG) on adipose tissue physiology is important for the treatment of obesity-related metabolic disorders. By using robust mouse models of bariatric surgery that closely resemble those performed in humans, we can compare the effects of RYGB and VSG on adipose physiology in the absence of post-operative confounds such as diet and lifestyle changes.
    Materials and methods: RYGB and VSG were compared using a diet-induced mouse model of obesity. High-fat diet (HFD) was administered post-operatively and changes to white and brown adipose tissue were evaluated, along with alterations to weight, glucose homeostasis, dyslipidemia, and insulin sensitivity.
    Results: After prolonged exposure to high-fat diet post-operatively, RYGB was effective in achieving sustained weight loss, while VSG unexpectedly accelerated weight gain rates. The resolution of obesity-related comorbidities such as glucose and insulin intolerance, dyslipidemia, and insulin sensitivity was improved after RYGB, but not for VSG. In RYGB, there were improvements to the function and health of white adipose tissue, enhanced brown adipose metabolism, and the browning of subcutaneous white adipose tissue, with no comparable changes seen for these factors after VSG. Some markers of systemic inflammation improved after both RYGB and VSG.
    Conclusion: There are significantly different effects between RYGB and VSG when HFD is administered post-operatively and robust mouse models of bariatric surgery are used. RYGB resulted in lasting physiological and metabolic changes but VSG showed little difference from that of its sham-operated, DIO counterpart.
    MeSH term(s) Animals ; Blood Glucose ; Diet, High-Fat ; Gastrectomy ; Gastric Bypass ; Mice ; Obesity, Morbid/surgery
    Chemical Substances Blood Glucose
    Language English
    Publishing date 2021-04-15
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1070827-3
    ISSN 1708-0428 ; 0960-8923
    ISSN (online) 1708-0428
    ISSN 0960-8923
    DOI 10.1007/s11695-021-05389-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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