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Endocrinology

  • 287 Articles
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ATGL links insulin dysregulation to insulin resistance in adolescents with obesity and hepatosteatosis
Aaron L. Slusher, … , Gerald I. Shulman, Sonia Caprio
Aaron L. Slusher, … , Gerald I. Shulman, Sonia Caprio
Published March 17, 2025
Citation Information: J Clin Invest. 2025;135(6):e184740. https://doi.org/10.1172/JCI184740.
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ATGL links insulin dysregulation to insulin resistance in adolescents with obesity and hepatosteatosis

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BACKGROUND This study examined the underlying cellular mechanisms associated with insulin resistance (IR) and metabolic disease risk within subcutaneous adipose tissue (SAT) in youth with obesity and IR compared with those without IR.METHODS Thirteen adolescents who were insulin sensitive (IS) and 17 adolescents with IR and obesity underwent a 3-hour oral glucose tolerance test and MRI to measure abdominal fat distribution and liver fat content. Lipolysis was determined by glycerol turnover ([2H5]-glycerol infusion) and adipose triglyceride lipase (ATGL) phosphorylation (Western blot) from SAT samples biopsied prior to and 30-minutes following insulin infusion during a hyperinsulinemic-euglycemic clamp (HEC).RESULTS Glycerol turnover suppression during the HEC (first step) was lower in participants with IR compared with those with IS. Prior to insulin infusion, activated ATGL (reflected by the p-ATGL (Ser406)-to-ATGL ratio) was greater in participants with IR compared with those with IS and suppressed in response to a 30-minute insulin exposure in participants with IS, but not in those with IR. Lastly, greater ATGL inactivation is associated with greater glycerol suppression and lower liver fat.CONCLUSIONS Insulin-mediated inhibition of adipose tissue lipolysis via ATGL is dysregulated among adolescents with IR compared with those with IS, thereby serving as a vital mechanism linking glucose and insulin dysregulation and ectopic lipid storage within the liver.FUNDING This work was supported by funding from the NIH (R01-HD028016-25A1, T32- DK-007058, R01-DK124272, RO1-DK119968, R01MD015974, RO1-DK113984, P3-DK045735, RO1-DK133143, and RC2-DK120534) and the Robert E. Leet and Clara Guthrie Patterson Trust Mentored Research Award.

Authors

Aaron L. Slusher, Nicola Santoro, Alla Vash-Margita, Alfonso Galderisi, Pamela Hu, Fuyuze Tokoglu, Zhongyao Li, Elena Tarabra, Jordan Strober, Daniel F. Vatner, Gerald I. Shulman, Sonia Caprio

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Identification of lysosomal lipolysis as an essential noncanonical mediator of adipocyte fasting and cold-induced lipolysis
Yu-Sheng Yeh, … , Irfan J. Lodhi, Babak Razani
Yu-Sheng Yeh, … , Irfan J. Lodhi, Babak Razani
Published March 17, 2025
Citation Information: J Clin Invest. 2025;135(6):e185340. https://doi.org/10.1172/JCI185340.
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Identification of lysosomal lipolysis as an essential noncanonical mediator of adipocyte fasting and cold-induced lipolysis

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Adipose tissue lipolysis is the process by which triglycerides in lipid stores are hydrolyzed into free fatty acids (FFAs), serving as fuel during fasting or cold-induced thermogenesis. Although cytosolic lipases are considered the predominant mechanism of liberating FFAs, lipolysis also occurs in lysosomes via lysosomal acid lipase (LIPA), albeit with unclear roles in lipid storage and whole-body metabolism. We found that adipocyte LIPA expression increased in adipose tissue of mice when lipolysis was stimulated during fasting, cold exposure, or β-adrenergic agonism. This was functionally important, as inhibition of LIPA genetically or pharmacologically resulted in lower plasma FFAs under lipolytic conditions. Furthermore, adipocyte LIPA deficiency impaired thermogenesis and oxygen consumption and rendered mice susceptible to diet-induced obesity. Importantly, lysosomal lipolysis was independent of adipose triglyceride lipase, the rate-limiting enzyme of cytosolic lipolysis. Our data suggest a significant role for LIPA and lysosomal lipolysis in adipocyte lipid metabolism beyond classical cytosolic lipolysis.

Authors

Yu-Sheng Yeh, Trent D. Evans, Mari Iwase, Se-Jin Jeong, Xiangyu Zhang, Ziyang Liu, Arick Park, Ali Ghasemian, Borna Dianati, Ali Javaheri, Dagmar Kratky, Satoko Kawarasaki, Tsuyoshi Goto, Hanrui Zhang, Partha Dutta, Francisco J. Schopfer, Adam C. Straub, Jaehyung Cho, Irfan J. Lodhi, Babak Razani

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Glucagon-like peptide-1 receptor agonists but not dipeptidyl peptidase-4 inhibitors reduce alcohol intake
Mehdi Farokhnia, … , Christopher T. Rentsch, Lorenzo Leggio
Mehdi Farokhnia, … , Christopher T. Rentsch, Lorenzo Leggio
Published March 6, 2025
Citation Information: J Clin Invest. 2025. https://doi.org/10.1172/JCI188314.
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Glucagon-like peptide-1 receptor agonists but not dipeptidyl peptidase-4 inhibitors reduce alcohol intake

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Background: Despite growing preclinical evidence that glucagon-like peptide-1 receptor agonists (GLP-1RAs) could be repurposed to treat alcohol use disorder (AUD), clinical evidence is scarce. Additionally, the potential impact of dipeptidyl peptidase-4 inhibitors (DPP-4Is) on alcohol intake is largely unknown. Methods: We conducted a large cohort study using 2008-2023 electronic health records data from the U.S. Department of Veterans Affairs. Changes in Alcohol Use Disorders Identification Test-Consumption (AUDIT-C) scores were compared between propensity-score-matched GLP-1RA recipients, DPP-4I recipients, and unexposed comparators. We further tested the effects of two DPP-4Is, linagliptin and omarigliptin, on binge-like alcohol drinking in mice and operant oral alcohol self-administration in alcohol-dependent rats, models previously used to show a significant effect of the GLP-1RA semaglutide in reducing alcohol intake. Results: GLP-1RA recipients reported a greater reduction in AUDIT-C scores than unexposed individuals [difference-in-difference: 0.09(0.03,0.14), p=0.0025] and DPP-4I recipients [difference-in-difference: 0.11(0.05,0.17), p=0.0002]. Reductions in drinking were more pronounced among individuals with baseline AUD [GLP-1RA vs. unexposed: 0.51(0.29,0.72), p<0.0001; GLP-1RA vs. DPP-4I: 0.65(0.43,0.88), p<0.0001] and baseline hazardous drinking [GLP-1RA vs. unexposed: 1.38(1.07,1.69), p<0.0001; GLP-1RA vs. DPP-4I: 1.00(0.68,1.33), p<0.0001]. There were no differences between DPP-4I recipients and unexposed individuals. The latter results were confirmed via a reverse translational approach. Specifically, neither linagliptin nor omarigliptin reduced alcohol drinking in mice or rats. The rodent experiments also confirmed target engagement as both DPP-4Is reduced blood glucose levels. Conclusion: Convergent findings across humans, mice, and rats indicate that GLP-1RAs but not DPP-4Is reduce alcohol consumption and may be efficacious in treating AUD.

Authors

Mehdi Farokhnia, John Tazare, Claire L. Pince, Nicolaus Bruns Vi, Joshua C. Gray, Vincent Lo Re III, David A. Fiellin, Henry R. Kranzler, George F. Koob, Amy C. Justice, Leandro F. Vendruscolo, Christopher T. Rentsch, Lorenzo Leggio

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Safety and efficacy of pharmacological inhibition of ketohexokinase in hereditary fructose intolerance
Evi J.C. Koene, … , Patrick Schrauwen, Martijn C.G.J. Brouwers
Evi J.C. Koene, … , Patrick Schrauwen, Martijn C.G.J. Brouwers
Published February 11, 2025
Citation Information: J Clin Invest. 2025. https://doi.org/10.1172/JCI187376.
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Safety and efficacy of pharmacological inhibition of ketohexokinase in hereditary fructose intolerance

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Authors

Evi J.C. Koene, Amée M. Buziau, David Cassiman, Timothy M. Cox, Judith Bons, Jean L. J. M. Scheijen, Casper G. Schalkwijk, Steven J.R. Meex, Aditi R. Saxena, William P. Esler, Vera B. Schrauwen-Hinderling, Patrick Schrauwen, Martijn C.G.J. Brouwers

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Leptin signaling maintains autonomic stability during severe influenza infection in mice
Andrés R. Muñoz-Rojas, … , Diane Mathis, Kartik N. Rajagopalan
Andrés R. Muñoz-Rojas, … , Diane Mathis, Kartik N. Rajagopalan
Published October 31, 2024
Citation Information: J Clin Invest. 2024. https://doi.org/10.1172/JCI182550.
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Leptin signaling maintains autonomic stability during severe influenza infection in mice

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Authors

Andrés R. Muñoz-Rojas, Adam C. Wang, Lisa E. Pomeranz, Elizabeth L. Reizis, Heather W. Stout-Delgado, Ileana C. Miranda, Krishnan Rajagopalan, Tadiwanashe Gwatiringa, Roger R. Fan, Ahmad A. Huda, Neha Maskey, Roseline P. Olumuyide, Aryan S. Patel, Jeffrey M. Friedman, Diane Mathis, Kartik N. Rajagopalan

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Attenuated kidney oxidative metabolism in young adults with type 1 diabetes
Ye Ji Choi, … , Matthias Kretzler, Petter Bjornstad
Ye Ji Choi, … , Matthias Kretzler, Petter Bjornstad
Published October 22, 2024
Citation Information: J Clin Invest. 2024. https://doi.org/10.1172/JCI183984.
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Attenuated kidney oxidative metabolism in young adults with type 1 diabetes

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BACKGROUND. In type 1 diabetes (T1D), impaired insulin sensitivity may contribute to the development of diabetic kidney disease (DKD) through alterations in kidney oxidative metabolism. METHODS. Young adults with T1D (n = 30) and healthy controls (HC, n = 20) underwent hyperinsulinemic-euglycemic clamp studies, MRI, 11C-acetate PET, kidney biopsies, single-cell RNA sequencing, and spatial metabolomics to assess this relationship. RESULTS. Participants with T1D had significantly higher glomerular basement membrane thickness compared to HC. T1D participants exhibited lower insulin sensitivity and cortical oxidative metabolism, correlating with higher insulin sensitivity. Proximal tubular transcripts of TCA cycle and oxidative phosphorylation enzymes were lower in T1D. Spatial metabolomics showed reductions in tubular TCA cycle intermediates, indicating mitochondrial dysfunction. The Slingshot algorithm identified a lineage of proximal tubular cells progressing from stable to adaptive/maladaptive subtypes, using pseudotime trajectory analysis, which computationally orders cells along a continuum of states. This analysis revealed distinct distribution patterns between T1D and HC, with attenuated oxidative metabolism in T1D attributed to a greater proportion of adaptive/maladaptive subtypes with low expression of TCA cycle and oxidative phosphorylation transcripts. Pseudotime progression associated with higher HbA1c, BMI, GBM, and lower insulin sensitivity and cortical oxidative metabolism. CONCLUSION. These early structural and metabolic changes in T1D kidneys may precede clinical DKD. TRIAL REGISTRATION. ClinicalTrials.gov NCT04074668

Authors

Ye Ji Choi, Gabriel Richard, Guanshi Zhang, Jeffrey B. Hodgin, Dawit S. Demeke, Yingbao Yang, Jennifer A. Schaub, Ian M. Tamayo, Bhupendra K. Gurung, Abhijit S. Naik, Viji Nair, Carissa Birznieks, Alexis MacDonald, Phoom Narongkiatikhun, Susan Gross, Lynette Driscoll, Maureen Flynn, Kalie Tommerdahl, Kristen J. Nadeau, Viral N. Shah, Tim Vigers, Janet K. Snell-Bergeon, Jessica Kendrick, Daniel H. van Raalte, Lu-Ping Li, Pottumarthi Prasad, Patricia Ladd, Bennett B. Chin, David Z. Cherney, Phillip J. McCown, Fadhl Alakwaa, Edgar A. Otto, Frank C. Brosius, Pierre Jean Saulnier, Victor G. Puelles, Jesse A. Goodrich, Kelly Street, Manjeri A. Venkatachalam, Aaron Ruiz, Ian H. de Boer, Robert G. Nelson, Laura Pyle, Denis P. Blondin, Kumar Sharma, Matthias Kretzler, Petter Bjornstad

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Activation of Gs signaling in mouse enteroendocrine K-cells greatly improves obesity- and diabetes-related metabolic deficits
Antwi-Boasiako Oteng, … , Frank Reimann, Jürgen Wess
Antwi-Boasiako Oteng, … , Frank Reimann, Jürgen Wess
Published October 22, 2024
Citation Information: J Clin Invest. 2024. https://doi.org/10.1172/JCI182325.
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Activation of Gs signaling in mouse enteroendocrine K-cells greatly improves obesity- and diabetes-related metabolic deficits

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Following a meal, glucagon-like peptide-1 (GLP1) and glucose-dependent insulinotropic polypeptide (GIP), the two major incretins promoting insulin release, are secreted from specialized enteroendocrine cells (L- and K-cells, respectively). Although GIP is the dominant incretin in humans, the detailed molecular mechanisms governing its release remain to be explored. GIP secretion is regulated by the activity of G protein-coupled receptors (GPCRs) expressed by K-cells. GPCRs couple to one or more specific classes of heterotrimeric G proteins. In the present study, we focused on the potential metabolic roles of K-cell Gs. First, we generated a mouse model that allowed us to selectively stimulate K-cell Gs signaling. Second, we generated a mouse strain harboring an inactivating mutation of Gnas, the gene encoding the alpha-subunit of Gs, selectively in K-cells. Metabolic phenotyping studies showed that acute or chronic stimulation of K-cell Gs signaling greatly improved impaired glucose homeostasis in obese mice and in a mouse model of type 2 diabetes, due to enhanced GIP secretion. In contrast, K-cell-specific Gnas knockout mice displayed markedly reduced plasma GIP levels. These data strongly suggest that strategies aimed at enhancing K-cell Gs signaling may prove useful for the treatment of diabetes and related metabolic diseases.

Authors

Antwi-Boasiako Oteng, Liu Liu, Yinghong Cui, Oksana Gavrilova, Huiyan Lu, Min Chen, Lee S. Weinstein, Jonathan E. Campbell, Jo E. Lewis, Fiona M. Gribble, Frank Reimann, Jürgen Wess

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Survival of men with metastatic hormone-sensitive prostate cancer and adrenal-permissive HSD3B1 inheritance
Nima Sharifi, … , Ian D. Davis, Christopher J. Sweeney
Nima Sharifi, … , Ian D. Davis, Christopher J. Sweeney
Published September 17, 2024
Citation Information: J Clin Invest. 2024;134(18):e183583. https://doi.org/10.1172/JCI183583.
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Survival of men with metastatic hormone-sensitive prostate cancer and adrenal-permissive HSD3B1 inheritance

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BACKGROUND Metastatic hormone-sensitive prostate cancer (mHSPC) is androgen dependent, and its treatment includes androgen deprivation therapy (ADT) with gonadal testosterone suppression. Since 2014, overall survival (OS) has been prolonged with addition of other systemic therapies, such as adrenal androgen synthesis blockers, potent androgen receptor blockers, or docetaxel, to ADT. HSD3B1 encodes the rate-limiting enzyme for nongonadal androgen synthesis, 3β-hydroxysteroid dehydrogenase-1, and has a common adrenal-permissive missense-encoding variant that confers increased synthesis of potent androgens from nongonadal precursor steroids and poorer prostate cancer outcomes.METHODS Our prespecified hypothesis was that poor outcome associated with inheritance of the adrenal-permissive HSD3B1 allele with ADT alone is reversed in patients with low-volume (LV) mHSPC with up-front ADT plus addition of androgen receptor (AR) antagonists to inhibit the effect of adrenal androgens. HSD3B1 genotype was obtained in 287 patients with LV disease treated with ADT + AR antagonist only in the phase III Enzalutamide in First Line Androgen Deprivation Therapy for Metastatic Prostate Cancer (ENZAMET) trial and was associated with clinical outcomes.RESULTS Patients who inherited the adrenal-permissive HSD3B1 allele had more favorable 5-year clinical progression-free survival and OS when treated with ADT plus enzalutamide or ADT plus nonsteroidal antiandrogen compared with their counterparts who did not have adrenal-permissive HSD3B1 inheritance. HSD3B1 was also associated with OS after accounting for known clinical variables. Patients with both genotypes benefited from early enzalutamide.CONCLUSION These data demonstrated an inherited physiologic driver of prostate cancer mortality is associated with clinical outcomes and is potentially pharmacologically reversible.FUNDING National Cancer Institute, NIH; Department of Defense; Prostate Cancer Foundation, Australian National Health and Medical Research Council.

Authors

Nima Sharifi, Robert Diaz, Hui-Ming Lin, Evan Roberts, Lisa G. Horvath, Andrew Martin, Martin R. Stockler, Sonia Yip, Vinod V. Subhash, Neil Portman, Ian D. Davis, Christopher J. Sweeney

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Postprandial metabolomics analysis reveals disordered serotonin metabolism in post-bariatric hypoglycemia
Rafael Ferraz-Bannitz, … , Darleen A. Sandoval, Mary-Elizabeth Patti
Rafael Ferraz-Bannitz, … , Darleen A. Sandoval, Mary-Elizabeth Patti
Published September 12, 2024
Citation Information: J Clin Invest. 2024. https://doi.org/10.1172/JCI180157.
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Postprandial metabolomics analysis reveals disordered serotonin metabolism in post-bariatric hypoglycemia

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BACKGROUND. Bariatric surgery is a potent therapeutic approach for obesity and type 2 diabetes but can be complicated by post-bariatric hypoglycemia (PBH). PBH typically occurs 1 to 3 hours after meals, in association with exaggerated postprandial levels of incretins and insulin. METHODS. To identify mediators of disordered metabolism in PBH, we analyzed plasma metabolome in fasting state and 30 and 120 minutes after mixed meal in 3 groups: PBH (n = 13), asymptomatic post-RYGB (n = 10), and non-surgical controls (n = 8). RESULTS. In the fasting state, multiple tricarboxylic acid cycle intermediates and the ketone beta-hydroxybutyrate were increased by 30% to 80% in PBH vs. asymptomatic. Conversely, multiple amino acids (BCAA, tryptophan) and polyunsaturated lipids were reduced by 20% to 50% in PBH versus asymptomatic. Tryptophan-related metabolites, including kynurenate, xanthurenate, and serotonin, were reduced by 2- to 10-fold in PBH in fasting state. Postprandially, plasma serotonin was uniquely increased by 1.9-fold in PBH versus asymptomatic post-RYGB. In mice, serotonin administration lowered glucose and increased plasma insulin and GLP-1. Moreover, serotonin-induced hypoglycemia in mice was blocked by the nonspecific serotonin receptor antagonist cyproheptadine and the specific serotonin receptor 2 antagonist ketanserin. CONCLUSION. Together these data suggest that increased postprandial serotonin may contribute to the pathophysiology of PBH and provide a potential therapeutic target. FUNDING. NIH grant R01 DK121995, NIH grant P30 DK036836 (Diabetes Research Center grant, Joslin Diabetes Center), and Fundação de Amparo à Pesquisa do Estado de São Paulo-FAPESP grant 2018/22111-2.

Authors

Rafael Ferraz-Bannitz, Berkcan Ozturk, Cameron J. Cummings, Vissarion Efthymiou, Pilar Casanova Querol, Lindsay Poulos, Hanna J. Wang, Valerie Navarrete, Hamayle Saeed, Christopher M. Mulla, Hui Pan, Jonathan M. Dreyfuss, Donald C. Simonson, Darleen A. Sandoval, Mary-Elizabeth Patti

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Teplizumab induces persistent changes in the antigen‐specific repertoire in individuals at‐risk for type 1 diabetes
Ana Lledó-Delgado, … , John S. Tsang, Kevan C. Herold
Ana Lledó-Delgado, … , John S. Tsang, Kevan C. Herold
Published August 13, 2024
Citation Information: J Clin Invest. 2024. https://doi.org/10.1172/JCI177492.
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Teplizumab induces persistent changes in the antigen‐specific repertoire in individuals at‐risk for type 1 diabetes

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BACKGROUND. Teplizumab, a FcR non-binding anti-CD3 mAb, is approved to delay progression of type 1 diabetes (T1D) at-risk patients. Previous investigations described the immediate effects of the 14-day treatment, but longer-term effects of the drug remain unknown. METHODS. With an extended analysis of study participants, we found that 36% were undiagnosed or remained clinical diabetes free after 5 years suggesting operational tolerance. Using single cell RNA-seq, we compared the phenotypes, transcriptome, and repertoire of peripheral blood CD8+ T cells including autoreactive T cells from study participants before and after teplizumab and features of responders and non-responders. RESULTS. At 3 months, there were transcriptional signatures of cell activation in CD4+ and CD8+ T cells including signaling that was reversed at 18 months. At that time, there was reduced expression of genes in T cell receptor and activation pathways in clinical responders. In CD8+ T cells, we found increased expression of genes associated with exhaustion and immune regulation with teplizumab treatment. These transcriptional features were further confirmed in an independent cohort. Pseudotime analysis showed differentiation of CD8+ exhausted and memory cells with teplizumab treatment. IL7R expression was reduced and patients with lower expression of CD127 had longer diabetes free intervals. In addition, the frequency of autoantigen reactive CD8+ T cells, that expanded in the placebo group over 18 months, did not increase in the teplizumab group. CONCLUSION. These findings indicate that teplizumab promotes operational tolerance in T1D, involving activation followed by exhaustion and regulation and prevents expansion of autoreactive T cells. TRIAL REGISTRATION. ClinicalTrials.gov: NCT01030861. FUNDING. NIDDK/NIH, Juvenile Diabetes Research Foundation.

Authors

Ana Lledó-Delgado, Paula Preston-Hurlburt, Sophia Currie, Pamela Clark, Peter S. Linsley, S. Alice Long, Can Liu, Galina Koroleva, Andrew J. Martins, John S. Tsang, Kevan C. Herold

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Fan Fan and colleagues demonstrate that dynamin 2 is important for maintaining insulin secretion dynamics in β cells…
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Published September 21, 2015
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Restricting β cell growth
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Insight into Kallmann syndrome
Anna Cariboni and colleagues demonstrate that dysfunctional SEMA3E results in gonadotropin-releasing hormone neuron deficiency…
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L cells to the rescue
Natalia Peterson and colleagues demonstrate that increasing L cell populations in the gut improves insulin responses and glucose tolerance in a murine type 2 diabetes model…
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