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Resolving the Paradox of Hepatic Insulin Resistance
Open accessAbstract
Insulin resistance is associated with numerous metabolic disorders, such as obesity and type II diabetes, that currently plague our society. Although insulin normally promotes anabolic metabolism in the liver by increasing glucose consumption and lipid synthesis, insulin-resistant individuals fail to inhibit hepatic glucose production and paradoxically have increased liver lipid synthesis, leading to hyperglycemia and hypertriglyceridemia. Here, we detail the intrahepatic and extrahepatic pathways mediating insulin's control of glucose and lipid metabolism. We propose that the interplay between both of these pathways controls insulin signaling and that mis-regulation between the 2 results in the paradoxic effects seen in the insulin-resistant liver instead of the commonly proposed deficiencies in particular branches of only the direct hepatic pathway.
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“Reduced phosphorylation of the PI3K/Akt pathway is a hallmark of IR in PCOS patients10–12.”
From Efficacy and safety of GLP-1 receptor agonists on weight management and metabolic parameters in PCOS women: a meta-analysis of randomized controlled trials (2025) · cites this paper as [11]
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“hepatic insulin resistance, among other effects, has proved to result in increased gluconeogenesis, lipogenesis, and synthesis of very-low-density lipoproteins (VLDL) [22]”
From The Role of Exercise in the Interplay between Myokines, Hepatokines, Osteokines, Adipokines, and Modulation of Inflammation for Energy Substrate Redistribution and Fat Mass Loss: A Review (2020) · cites this paper as [22]
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“increasing liver lipid synthesis can result in hypertriglyceridae-mia [5].”
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“The liver plays a crucial role in systemic regulation of glucose and lipid metabolism, and aberrant hepatic insulin action is considered a potential primary factor in insulin resistance (Santoleri and Titchenell 2019).”
BackgroundIntersection of the Orphan G Protein-Coupled Receptor, GPR19, with the Aging Process
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“…this increase of glycaemia was due to insulin resistance generated by receptor desensitization derived from a hyperinsulinemia; in fact, it is known that insulin resistance is closely related to numerous metabolic disorders including the type 2 diabetes mellitus (Santoreli and Titchenell 2019).”
BackgroundGiannotti, L., Stanca, E., Stanca, B. D. C., Spedicato, F., Massaro, M., Quarta, S., Rio, D. D., Mena, P. R., Siculella, L., & Damiano, F. (2024) · Molecular Nutrition & Food Research · doi:10.1002/mnfr.202400338 · Cited by 9
Ocular surface complications in diabetes: The interrelationship between insulin and enkephalin
Purushothaman, I., Zagon, I. S., Sassani, J. W., & McLaughlin, P. J. (2021) · Biochemical Pharmacology · doi:10.1016/j.bcp.2021.114712 · Cited by 9
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“58,59 Furthermore, there will be hyperinsulinemia, leading to hepatic steatosis.”
BackgroundKumar, R., Chinala, A., Grandhe, D., Endicott, S. J., Garcia, M. A., Campen, M. J., & Gullapalli, R. R. (2025) · Environmental Pollution · doi:10.1016/j.envpol.2025.126844 · Cited by 7
Balakrishnan, B., Hariharapura, R. C., Nayak, V., & Divyashree, M. S. (2025) · Archives of Physiology and Biochemistry · doi:10.1080/13813455.2025.2567336 · Cited by 8
“…sensitivity and increased hepatic glucose output. β-cells secrete increasing amounts of insulin to cope with the demand to normalise glucose levels (Santoleri & titchenell, 2019). this eventually stresses out the β-cells. this and other metabolic changes ultimately lead to β-cell dysfunction and…”
Toll Like Receptor 4: A Potential Link Between Obesity and Metabolic Diseases
Alhamar, G., Razafiarison, J., Alzaïd, F., Al‐Mulla, F., & Ahmad, R. (2026) · Obesity Reviews · doi:10.1111/obr.70107 · Cited by 8
“The liver is equally critical for systemic insulin sensitivity, due to its role in glucose production and lipid metabolism [89].”
A glucose-insulin-glucagon coupled model of the isoglycemic intravenous glucose infusion experiment
Subramanian, V., Bagger, J. I., Holst, J. J., Knop, F. K., & Vilsbøll, T. (2022) · Frontiers in Physiology · doi:10.3389/fphys.2022.911616 · Cited by 10
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Amer, A. E., Ghoneim, H. A., Abdelaziz, R. R., Shehatou, G. S. G., & Suddek, G. M. (2024) · BMC Pharmacology and Toxicology · doi:10.1186/s40360-024-00820-z · Cited by 7
“The PI3K/Akt pathway is the major insulin pathway that controls the insulin actions in the body [5, 6].”
Ma, C., Yang, X., Zhang, L., Zhang, J., Zhang, Y., & Hu, X. (2025) · PLoS ONE · doi:10.1371/journal.pone.0318696 · Cited by 7
“Insulin resistance enhances the gluconeogenesis process in the liver and also promotes the synthesis of triglycerides [1] and fat [16,10].”
Impact of placental mTOR deficiency on peripheral insulin signaling in adult mice offspring
Beetch, M., Akhaphong, B., Wong, A., Clifton, B., Jo, S., Mohan, R., Abrahante, J. E., & Alejandro, E. U. (2023) · Journal of Molecular Endocrinology · doi:10.1530/jme-23-0035 · Cited by 6
“Preclinical studies have shown that impaired hepatic Akt signaling is associated with hyperinsulinemia and insulin resistance (Santoleri & Titchenell 2019).”
BackgroundBajaj, G., Singh, V., Sagar, P., Gupta, R., & Singhal, N. K. (2024) · International Journal of Biological Macromolecules · doi:10.1016/j.ijbiomac.2024.132504 · Cited by 7
Yang, L., Feng, Y., Wang, Y., Liu, C., & Gao, D. (2024) · Endocrine · doi:10.1007/s12020-024-03947-5 · Cited by 7
“Intrahepatic fat accumulation leads to hepatic IR, which signi fi cantly alters glucose and lipid homeostasis [50, 51].”
Hernández-Gómez, K. G., Velázquez‐Villegas, L. A., Granados‐Portillo, O., Ávila-Nava, A., González-Salazar, L. E., Serralde-Zúñiga, A. E., Palacios‐González, B., Pichardo‐Ontiveros, E., Guizar-Heredia, R., López‐Barradas, A. M., et al. (2024) · International Journal of Molecular Sciences · doi:10.3390/ijms25147716 · Cited by 8
“However, these regulatory mechanisms are altered in the insulin-resistant state [27–30].”
BackgroundZhao, Y., Qiao, M., Wang, X.-M., Luo, X., Yang, J.-H., & Hu, J.-P. (2024) · Heliyon · doi:10.1016/j.heliyon.2024.e34716 · Cited by 8
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Wang, R., Ren, Y., Javed, H. U., Luo, J., Zhou, M., & Shu, X. (2022) · Aquaculture Nutrition · doi:10.1155/2022/8371440 · Cited by 7
“Insulin resistance does not prevent the liver from producing glucose, making it easier to accumulate lipids in the liver, resulting in elevated blood glucose and triglycerides, which are linked to the development of fatty liver [50, 51].”
BackgroundJørgensen, S. H., Emdal, K. B., Pedersen, A.-K., Axelsen, L. N., Kildegaard, H. F., Demozay, D., Pedersen, T. Å., Grønborg, M., Slaaby, R., Nielsen, P. K., et al. (2024) · Scientific Reports · doi:10.1038/s41598-024-77817-5 · Cited by 7
Pebriana, R. B., Chen, T., Derks, R. J. E., Blomberg, N., Grefhorst, A., Mohammed, Y., Nieuwdorp, M., Verheij, J., Doukas, M., Rensen, P. C. N., et al. (2025) · Journal of Lipid Research · doi:10.1016/j.jlr.2025.100845 · Cited by 6
“Abdominal, particularly visceral, obesity is strongly associated with MASLD, caused by a high flux of free fatty acids from insulin-resistant adipocytes to the liver in combination with increased hepatic lipogenesis driven by hyperinsulinemia (2, 3).”
Holleboom, A. G., Francque, S., Cusi, K. J., & Caussy, C. (2025) · Metabolism Open · doi:10.1016/j.metop.2025.100424 · Cited by 8
“In conjunction with the occurrence of steatosis, hepatocytes themselves become resistant to insulin due to actions of lipotoxic subspecies, especially diacylglycerol (DAG) [49].”
Colognesi, M., Gabbia, D., Signor, A., Sarill, M., Centofanti, L., Rinaldi, A., Cascione, L., Nunziata, S., Banzato, M., Mattarei, A., et al. (2025) · Pharmacological Research · doi:10.1016/j.phrs.2025.108080 · Cited by 8
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“40,41 In cases of insulin resistance, disrupted insulin signaling and reduced hepatocyte sensitivity lead to uncontrolled hepatic glucose production and hyperinsulinemia, further enhancing SREBP-1c-dependent adipogenesis.”
Cold exposure and human metabolism: A heterogeneous response across tissues and organs
Tetzlaff, E. J., Hancock, C. L., Waddell, L., Gagnon, S. S., Mäkelä, K. A., Karhu, T., Peltonen, J. E., Herzig, K., & Gagnon, D. D. (2026) · Temperature · doi:10.1080/23328940.2025.2599582 · Cited by 6
“On the other hand, insulin inhibits lipolysis and glucagon secretion [240], fatty acid oxidation, gluconeogenesis, synthesis but increases de novo lipogenesis, triglyceride esterification, triglyceride secretion [242], glycolysis and glycogen synthesis [243].”
Lopez-Vilaret, K. M., Cantero, J. L., Fernandez-Alvarez, M., Calero, M., Calero, O., Lindı́n, M., Zurrón, M., Dı́az, F., & Atienza, M. (2021) · Aging · doi:10.18632/aging.203668 · Cited by 6
“During the progression of IR, insulin fails to suppress hepatic glucose production, but paradoxically accelerates lipid synthesis, leading to hyperglycemia and hypertriglyceridemia [55].”
BackgroundSantoleri, D., Lim, H., Emmett, M. J., Stoute, J., Gavin, M. J., Sostre‐Colón, J., Uehara, K., Welles, J. E., Liu, K. F., Lazar, M. A., et al. (2022) · iScience · doi:10.1016/j.isci.2022.104410 · Cited by 5
“The serine/threonine kinase Akt plays a central role in the hepatic response to insulin, promoting hepatic glucose utilization, glycogen synthesis, and lipogenesis while simultaneously suppressing gluconeogenesis (Titchenell et al., 2017; Santoleri and Titchenell, 2018).”
BackgroundSarma, P., Bharadwaj, S., Swargiary, D., Ahmed, S. A., Sheikh, Y., Barge, S., Manna, P., Talukdar, N. C., Bora, J. J., & Borah, J. C. (2022) · New Journal of Chemistry · doi:10.1039/d1nj05856h · Cited by 6
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“According to clinical definitions, IR is a disease that makes cells less responsive to an established amount of insulin, necessitating larger doses of insulin to produce the same cellular response [4].”
BackgroundCoagulation Factor VII Fine-tunes Hepatic Steatosis by Blocking AKT-CD36–Mediated Fatty Acid Uptake
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Genetic determinants of obesity heterogeneity in type II diabetes
Khorami, S. A. H., Mutalib, M. S. A., Shiraz, M. F., Abdullah, J. A., Rejali, Z., Ali, R. M., & Khaza’ai, H. (2020) · Nutrition & Metabolism · doi:10.1186/s12986-020-00476-6 · Cited by 9
Genetic underpinnnings of type 2 diabetes
Shah, A., Bush, C. O., & Perry, R. J. (2025) · Advances in genetics · doi:10.1016/bs.adgen.2024.12.001 · Cited by 6
Zou, H., Ma, X., Wen, P., & Xie, Y. (2025) · European journal of medical research · doi:10.1186/s40001-025-02936-2 · Cited by 7
“…[12], and its pathogenesis is not completely clear, and the more widely accepted theories are the “double-hit” theory and the “multiple-hit” theory [13, 14], but whether it is the"double-hit"or “multiple-hit” theory, insulin resistance (IR) is an essential part of the development of MASLD [15–20].”
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“The sources of excess free fatty acids that make up the hepatic triglyceride lipid pool includes increased uptake of circulating free fatty acids from adipose tissue lipolysis, de novo lipogenesis, and dietary lipids (Donnelly et al., 2005; Santoleri and Titchenell, 2019).”
Background
Metadata
- Authors
- Santoleri, D., & Titchenell, P. M.
- Affiliations
- University of Pennsylvania (US)
- Corresponding author
- Titchenell, Paul M.
- Venue
- Cellular and Molecular Gastroenterology and Hepatology
- Publisher
- Elsevier BV
- Published
- 2019
- Volume
- 7
- Issue
- 2
- Pages
- 447-456
- ISSN
- 2352-345X (ISSN-L)
- PMC
- PMC6369222
- OpenAlex
- W2899043265
- Cited by
- 336
- References
- 102
- Citations by year
- 2026: 35 · 2025: 57 · 2024: 61 · 2023: 63 · 2022: 51 · 2021: 40 · 2020: 24 · 2019: 5
- FWCI
- 2.57
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Cellular and Molecular Gastroenterology and Hepatology (publishedVersion, cc-by-nc-nd)
- Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Institutes of Health (K01 DK111715, P30 DK19525)
- Topics
- Health Sciences › Medicine › Hepatology › Liver Disease Diagnosis and Treatment
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
- Keywords
- hepatic insulin resistance, insulin signaling, hepatic glucose production, hepatic lipid synthesis, hypertriglyceridemia, hyperglycemia, type 2 diabetes, obesity, glucose metabolism, lipid metabolism
- MeSH terms
- Animals, Humans, Insulin, Insulin Resistance, Liver, Models, Biological, Signal Transduction, Lipid Metabolism
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