Introduction: What they say
A study from the International Center for T1D, Pediatric Clinical Research Center Romeo ed Enrica Invernizzi, “L. Sacco” Department of Biomedical and Clinical Sciences, University of Milan, Milan 20157, Italy; and Nephrology Division, Boston Children’s Hospital, Harvard Medical School, Boston, MA 02115, USA shows that “PD-L1 genetic overexpression or pharmacological restoration in hematopoietic stem and progenitor cells reverses autoimmune diabetes.” This research paper was published, in the 15 November 2017 issue of the journal “Science Translational Medicine” [One of the best research journals in Science with an I.F of 15 plus], by Prof. Fiorina P and Nasr MB and others.
What we say:
On the foundation of this interesting finding, Dr L Boominathan PhD, Director-cum-chief Scientist of GBMD, reports that: BCG vaccine-based therapy for autoimmune diabetes (TIDM): BCG vaccine increases the expression of PD-L1, augments Tregs function, promotes immune tolerance, increases pancreatic β-cell proliferation and regeneration, increases insulin secretion, improves insulin sensitivity, increases energy utilization, and reverses TIDM, via up regulation of its target gene
From significance of the study to public health relevance:
Given that: (1) more than 422 million people worldwide are affected by Diabetes mellitus (DM); (2) Type 1 Diabetes (T1DM) constitutes about 5-10% (11 to 12 million) of all diabetic cases; (3) the incidence of T1DM is exponentially increasing year after year by 3%; (4) Diabetes is going to be one of the top 10 causes of death by 2030; (5) the life-long painful injection/drug treatment is required to treat DM; (6) the global economic cost spent for diabetes treatment in 2014 was little more than 600 billion US dollars, while treatment for T1DM costs about $15 billion dollars per annum, there is an urgent need to find: (i) a way to induce regeneration of adult ß-cells that were lost in DM;(ii) a side-effect-free natural product-based drug that does not harm or deplete adult stem cells; and (iii) a way to cure, not just treat, diabetes.
What is known?
Prof. Fiorina’s research team has recently shown that:(1) programmed death ligand 1 (PD-L1), the immune checkpoint regulator, is expressed poorly in hematopoietic stem and progenitor cells (HSPCs) of Type-1 diabetic (T1D) patients; (2) PD-L1 inhibits activated T-cells and thereby promotes immune tolerance; (3) the expression of PD-L1 is controlled by a network of miRNAs; (4) attenuating the expression of one of the miRNAs that target PD-L1 restores the expression of PD-L1 in HSPCs; (5) increasing the expression of PD-L1 in HSPCs, either genetically or pharmacologically, inhibits autoimmune response and reverses autoimmune diabetes; and (6) PD-L1 is expressed poorly in human HSPCs of T1D patients, suggesting that increasing the expression of PD-L1 in T1D patients may reverse and cure T1D.
From research findings to Therapeutic opportunity:
This study suggests Bacillus Calmette Guerin (BCG) vaccine-based therapy, with detailed mechanistic insights, for autoimmune diabetes (TIDM). BCG vaccine has been found to be useful in tuberculosis, more recently in the treatment of diabetes. However, the mechanism of action remains unknown.
This study suggests, for the first time, that BCG vaccine, by increasing the expression of its target gene, it may increase the expression of PD-L1. Thereby, it may: (1) increase Regulatory T-cells(Tregs) function; (2) decrease immune activation; (3) increase pancreatic-β-cell proliferation and regeneration; (4) increase expression of genes that promote insulin sensitivity and insulin secretion;(4) decrease metabolic stress; and (5) promote glucose homeostasis (Fig.1).Thus, BCG vaccine, either alone or in combination with other drugs, may be used to treat TIDM (Fig.2.).
Details of the research findings:
Idea Proposed/Formulated (with experimental evidence) by: Dr L Boominathan Ph.D.
Undisclosed information: How does BCG vaccine increase the expression of PD-L1?
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Citation: Boominathan, L., BCG vaccine-based therapy for autoimmune diabetes (TIDM): BCG vaccine increases the expression of PD-L1, augments Tregs function, promotes immune tolerance, increases pancreatic β-cell proliferation and regeneration, increases insulin secretion, improves insulin sensitivity, increases energy utilization, and reverses TIDM, via up regulation of its target gene, 24/June/2018, 5.20 pm, Genome-2-Bio-Medicine Discovery center (GBMD), http://genomediscovery.org
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