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From DINOMIT to Systemic Leaky Barrier SyndromeVitamin D as a Master Regulator of Biological Barrier Integrityby Richard Z. Cheng, MD, PhD
Cedric F. Garland, DrPH, FACE
Jen Aliano, MS, CCN
Honoring a Foundational Insight While Advancing a Systems PerspectiveFor more than two decades, the work of Cedric Garland and colleagues-including Frank Garland, Edward Gorham, and collaborators-has profoundly shaped our understanding of vitamin D as a central determinant of cancer risk and immune health (Garland et al., 2009). Among these contributions, the DINOMIT model stands as a landmark conceptual framework describing a sequence of biological processes associated with vitamin D deficiency: Disjunction, Initiation, Natural selection, Overgrowth, Metastasis, Involution, and Transition. DINOMIT was not merely descriptive-it was prescient. It recognized early that disruption of intercellular adhesion and tissue integrity represents a foundational step in disease progression. As vitamin D research has advanced, accumulating molecular, immunological, and clinical evidence suggests that DINOMIT captured not only downstream disease manifestations, but also a deeper upstream vulnerability: the loss of biological barrier integrity across multiple organ systems. This article proposes that DINOMIT can be further understood and extended within a broader systems framework: Systemic Leaky Barrier Syndrome (SLBS), a systems-level model describing the role of barrier dysfunction in chronic disease development (Cheng, 2026a). DINOMIT: A Model Ahead of Its TimeDINOMIT recognized that vitamin D deficiency contributes to:
These insights were supported by epidemiologic observations linking low serum 25-hydroxyvitamin D levels with increased risk of multiple cancers (Garland et al., 1980; Garland et al., 1985; Garland et al., 1989), and by mechanistic studies on cellular differentiation and junctional biology (Pálmer et al., 2001; Farquhar and Palade, 1963). At the time the model was proposed, the molecular understanding of epithelial barriers, tight junctions, and vitamin D receptor signaling was still emerging. Today, these mechanisms are far better characterized-and they strongly support the biological plausibility of DINOMIT. Vitamin D and Biological Barrier IntegrityVitamin D is now recognized as a key regulator of barrier function across multiple systems, including intestinal epithelium, vascular endothelium, blood-brain barrier, pulmonary epithelium, renal filtration barrier, and skin. Through vitamin D receptor-mediated signaling, vitamin D regulates tight junction proteins such as claudins, occludin, and ZO-1, while also modulating antimicrobial peptides, immune tolerance, and inflammatory pathways (Chun et al., 2014; Hewison, 2012; Cheng, 2026b). Vitamin D deficiency has been associated with increased intestinal permeability ("leaky gut"), endothelial dysfunction, and disruption of the blood-brain barrier (Assa et al., 2014; Garcion et al., 2002; Talmor-Barkan et al., 2021). Conversely, vitamin D repletion has been shown to improve junctional integrity and reduce inflammatory leakage. Importantly, barrier dysfunction does not occur in isolation. Multiple barriers may become progressively permeable, allowing microbial products, inflammatory mediators, and oxidative stress signals to enter systemic circulation, contributing to chronic low-grade inflammation. Systemic Leaky Barrier Syndrome (SLBS): A Systems-Level ExtensionSystemic Leaky Barrier Syndrome (SLBS) is not a replacement for DINOMIT, but an extension of it, grounded in systems-level models of barrier dysfunction in chronic disease (Cheng, 2026a). Within this framework:
In this sense, DINOMIT describes what happens, while SLBS helps explain why it happens systemically. Broader Disease ImplicationsThe barrier-centered model provides a unifying framework across multiple conditions. In cancer, vitamin D sufficiency may help stabilize epithelial and endothelial barriers, reducing inflammatory and angiogenic signaling that support tumor development. In autoimmune and inflammatory diseases, barrier dysfunction is increasingly recognized as a common underlying feature. Vitamin D plays an important role in maintaining immune tolerance at barrier interfaces (Aranow, 2011). In Type 1 diabetes, epidemiologic and mechanistic models suggest that vitamin D deficiency may contribute to disease risk through barrier dysfunction and immune dysregulation (Mohr et al., 2008). In aging, increased barrier permeability contributes to chronic inflammation. Vitamin D insufficiency may accelerate this process. Clinical and Research ImplicationsA barrier-centered understanding of vitamin D suggests:
Population-level evidence suggests that maintaining serum 25-hydroxyvitamin D concentrations at or above 50 ng/mL may be associated with reduced risks of cancer and chronic disease (Lappe et al., 2017; McDonnell et al., 2018). Honoring a Scientific LegacyThe contributions of Cedric Garland and colleagues laid the conceptual foundation for understanding vitamin D as a root determinant of disease, rather than a secondary association. The SLBS framework is offered in that same spirit: to refine and extend these insights using contemporary systems biology. Scientific progress is cumulative. DINOMIT established the foundation; barrier biology helps complete the architecture. Closing PerspectiveVitamin D is not simply a nutrient or hormone. It functions as a regulator of biological boundaries-the interfaces between internal physiology and the external environment. Viewing DINOMIT together with Systemic Leaky Barrier Syndrome provides a more complete and clinically actionable framework for understanding the role of vitamin D in human health. Author NoteA peer-review-ready version of this framework has been submitted for academic publication. This article is being co-published by the Orthomolecular Medicine News Service (OMNS) and GrassrootsHealth. References (Alphabetical)Apperly FL. (1941). The relation of solar radiation to cancer mortality in North America. Cancer Research, 1, 191-195. Aranow C. (2011). Vitamin D and the immune system. Journal of Investigative Medicine, 59(6), 881-886. Assa A, et al. (2014). Vitamin D deficiency promotes epithelial barrier dysfunction. Gut, 63(4), 588-597. Cheng RZ. (2026a). Systemic Leaky Barrier Syndrome (SLBS): A Systems-Level Framework for Chronic Disease. Preprints, 2026020069. https://doi.org/10.20944/preprints202602.0069.v2 Cheng RZ. (2026b). Vitamin D as a Master Regulator of Biological Barrier Integrity. Preprints. Chun RF, Liu PT, Modlin RL, Adams JS, Hewison M. (2014). Impact of vitamin D on immune function. Nutrients, 6(2), 250-290. Farquhar MG, Palade GE. (1963). Junctional complexes in various epithelia. Journal of Cell Biology, 17(2), 375-412. Garcion E, et al. (2002). Vitamin D and the blood-brain barrier. Trends in Endocrinology & Metabolism, 13(3), 100-105. Garland CF, Garland FC. (1980). Do sunlight and vitamin D reduce the likelihood of colon cancer? International Journal of Epidemiology, 9(3), 227-231. Garland C, Shekelle RB, Barrett-Connor E, et al. (1985). Dietary vitamin D and calcium and risk of colorectal cancer. Lancet, 1, 307-309. Garland C, Comstock GW, Garland FC, et al. (1989). Serum 25-hydroxyvitamin D and colon cancer. Lancet, 2, 1176-1178. Garland CF, Gorham ED, Mohr SB, Grant WB. (2009). Vitamin D for cancer prevention: global perspective. Annals of Epidemiology. Hewison M. (2012). Vitamin D and immune function. Journal of Endocrinology, 215(2), 225-236. Lappe JM, et al. (2017). Vitamin D and calcium supplementation and cancer incidence. JAMA, 317(12), 1234-1243. McDonnell SL, et al. (2018). Breast cancer risk and vitamin D status. PLoS ONE, 13(6), e0199265. Mohr SB, Garland CF, Gorham ED, Garland FC. (2008). UVB and type 1 diabetes incidence. Diabetologia, 51, 1391-1398. Pálmer HG, et al. (2001). Vitamin D3 promotes differentiation of colon carcinoma cells. Journal of Cell Biology, 154(2), 369-387. Peller S. (1937). Skin irritation and cancer. American Journal of the Medical Sciences, 194, 326-333. Talmor-Barkan Y, et al. (2021). Vitamin D and endothelial function. Journal of Steroid Biochemistry and Molecular Biology, 213, 105938. Orthomolecular MedicineOrthomolecular medicine uses safe, effective nutritional therapy to fight illness. For more information: http://www.orthomolecular.org Find a DoctorTo locate an orthomolecular physician near you: http://orthomolecular.org/resources/omns/v06n09.shtml The peer-reviewed Orthomolecular Medicine News Service is a non-profit and non-commercial informational resource. Editorial Review Board:
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