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      Diabetic nephropathy: Time to withhold development and progression - A review

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          The recent discoveries in the fields of pathogenesis and management of diabetic nephropathy have revolutionized the knowledge about this disease. Little was added to the management of diabetic nephropathy after the introduction of renin angiotensin system blockers. The ineffective role of the renin- angiotensin system blockers in primary prevention of diabetic nephropathy in type 1 diabetes mellitus necessitated the search for other early therapeutic interventions that target alternative pathogenic mechanisms. Among the different classes of oral hypoglycemic agents, recent studies highlighted the distinguished mechanisms of sodium glucose transporter 2 blockers and dipeptidyl peptidase-4 inhibitors that settle their renoprotective actions beyond the hypoglycemic effects. The introduction of antioxidant and anti-inflammatory agents to this field had also added wealth of knowledge. However, many of these agents are still waiting well-designed clinical studies in order to prove their beneficial therapeutic role. The aim of this review of literature is to highlight the recent advances in understanding the pathogenesis, diagnosis, the established and the potential renoprotective therapeutic agents that would prevent the development or the progression of diabetic nephropathy.

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          Metformin, independent of AMPK, induces mTOR inhibition and cell-cycle arrest through REDD1.

          Isaam Ben Sahra, Claire Regazzetti, Guillaume Robert … (2011)
          Metformin is a widely prescribed antidiabetic drug associated with a reduced risk of cancer. Many studies show that metformin inhibits cancer cell viability through the inhibition of mTOR. We recently showed that antiproliferative action of metformin in prostate cancer cell lines is not mediated by AMP-activated protein kinase (AMPK). We identified REDD1 (also known as DDIT4 and RTP801), a negative regulator of mTOR, as a new molecular target of metformin. We show that metformin increases REDD1 expression in a p53-dependent manner. REDD1 invalidation, using siRNA or REDD1(-/-) cells, abrogates metformin inhibition of mTOR. Importantly, inhibition of REDD1 reverses metformin-induced cell-cycle arrest and significantly protects from the deleterious effects of metformin on cell transformation. Finally, we show the contribution of p53 in mediating metformin action in prostate cancer cells. These results highlight the p53/REDD1 axis as a new molecular target in anticancer therapy in response to metformin treatment. ©2011 AACR.
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            Selective vitamin D receptor activation with paricalcitol for reduction of albuminuria in patients with type 2 diabetes (VITAL study): a randomised controlled trial.

            Dick de Zeeuw, Rajiv Agarwal, Michael J. Amdahl … (2010)
            Despite treatment with renin–angiotensin–aldosterone system (RAAS) inhibitors, patients with diabetes have increased risk of progressive renal failure that correlates with albuminuria. We aimed to assess whether paricalcitol could be used to reduce albuminuria in patients with diabetic nephropathy. In this multinational, placebo-controlled, double-blind trial, we enrolled patients with type 2 diabetes and albuminuria who were receiving angiotensin-converting enzyme inhibitors or angiotensin receptor blockers. Patients were assigned (1:1:1) by computer-generated randomisation sequence to receive 24 weeks’ treatment with placebo,1 μg/day paricalcitol, or 2 μg/day paricalcitol. The primary endpoint was the percentage change in geometric mean urinary albumin-to-creatinine ratio (UACR) from baseline to last measurement during treatment for the combined paricalcitol groups versus the placebo group. Analysis was by intention to treat. This trial is registered with ClinicalTrials.gov, number NCT00421733. Between February, 2007, and October, 2008, 281 patients were enrolled and assigned to receive placebo(n=93), 1 μg paricalcitol (n=93), or 2 μg paricalcitol (n=95); 88 patients on placebo, 92 on 1 μg paricalcitol, and 92 on2 μg paricalcitol received at least one dose of study drug, and had UACR data at baseline and at least one timepoint during treatment, and so were included in the primary analysis. Change in UACR was: –3% (from 61 to 60 mg/mmol;95% CI –16 to 13) in the placebo group; –16% (from 62 to 51 mg/mmol; –24 to –9) in the combined paricalcitol groups, with a between-group difference versus placebo of –15% (95% CI –28 to 1; p=0.071); –14% (from 63 to 54 mg/mmol; –24 to –1) in the 1 μg paricalcitol group, with a between-group difference versus placebo of –11%(95% CI –27 to 8; p=0.23); and –20% (from 61 to 49 mg/mmol; –30 to –8) in the 2 μg paricalcitol group, with a between-group difference versus placebo of –18% (95% CI –32 to 0; p=0.053). Patients on 2 μg paricalcitol showed a nearly, sustained reduction in UACR, ranging from –18% to –28% (p=0.014 vs placebo). Incidence of hypercalcaemia,adverse events, and serious adverse events was similar between groups receiving paricalcitol versus placebo. Addition of 2 μg/day paricalcitol to RAAS inhibition safely lowers residual albuminuria in patients with diabetic nephropathy, and could be a novel approach to lower residual renal risk in diabetes. Abbott.
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              The stages in diabetic renal disease. With emphasis on the stage of incipient diabetic nephropathy.

              C E Mogensen, C Christensen, E Vittinghus (1983)
              Alterations in renal function and structure are found even at the onset of diabetes mellitus. Studies performed over the last decade now allow definition of a series of stages in the development of renal changes in diabetes. Such a classification may be useful both in clinical work and in research activities. Stage 1 is characterized by early hyperfunction and hypertrophy. These changes are found at diagnosis, before insulin treatment. Increased urinary albumin excretion, aggravated during physical exercise, is also a characteristic finding. Changes are at least partly reversible by insulin treatment. Stage 2 develops silently over many years and is characterized by morphologic lesions without signs of clinical disease. However, kidney function tests and morphometry on biopsy specimens reveal changes. The function is characterized by increased GFR. During good diabetes control, albumin excretion is normal; however, physical exercise unmasks changes in albuminuria not demonstrable in the resting situation. During poor diabetes control albumin excretion goes up both at rest and during exercise. A number of patients continue in stage 2 throughout their lives. Stage 3, incipient diabetic nephropathy, is the forerunner of overt diabetic nephropathy. Its main manifestation is abnormally elevated urinary albumin excretion, as measured by radioimmunoassay. A level higher than the values found in normal subjects but lower than in clinical disease is the main characteristic of this stage, which appeared to be between 15 and 300 micrograms/min in the baseline situation. A slow, gradual increase over the years is a prominent feature in this very decisive phase of renal disease in diabetes when blood pressure is rising. The increased rate in albumin excretion is higher in patients with increased blood pressure. GFR is still supranormal and antihypertensive treatment in this phase is under investigation, using the physical exercise test. Stage 4 is overt diabetic nephropathy, the classic entity characterized by persistent proteinuria (greater than 0.5 g/24 h). When the associated high blood pressure is left untreated, renal function (GFR) declines, the mean fall rate being around 1 ml/min/mo. Long-term antihypertensive treatment reduces the fall rate by about 60% and thus postpones uremia considerably. Stage 5 is end-stage renal failure with uremia due to diabetic nephropathy. As many as 25% of the population presently entering the end-stage renal failure programs in the United States are diabetic. Diabetic nephropathy and diabetic vasculopathy constitute a major medical problem in society today.
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                Author and article information

                Contributors
                Usama A.A. Sharaf El Din
                Journal
                Journal ID (nlm-ta): J Adv Res
                Journal ID (iso-abbrev): J Adv Res
                Title: Journal of Advanced Research
                Publisher: Elsevier
                ISSN (Print): 2090-1232
                ISSN (Electronic): 2090-1224
                Publication date PMC-release: 21 April 2017
                Publication date (Print): July 2017
                Publication date (Electronic): 21 April 2017
                Volume: 8
                Issue: 4
                Pages: 363-373
                Affiliations
                [a ]Nephrology Unit, Internal Medicine Department, School of Medicine, Cairo University, Egypt
                [b ]Endocrinology Unit, Internal Medicine Department, School of Medicine, Cairo University, Egypt
                [c ]Rheumatology and Rehabilitation Department, School of Medicine, Cairo University, Egypt
                Author notes
                [* ]Corresponding author. usamaaas@ 123456gmail.com
                [1]

                The first two authors contributed equally to this study.

                Article
                Publisher ID: S2090-1232(17)30049-8
                DOI: 10.1016/j.jare.2017.04.004
                PMC ID: 5430158
                PubMed ID: 28540086
                SO-VID: f1a3c14a-fca1-463a-ad49-bbe6621c176b
                Copyright © © 2017 Production and hosting by Elsevier B.V. on behalf of Cairo University.
                License:

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                Date received : 22 February 2017
                Date revision received : 19 April 2017
                Date accepted : 20 April 2017
                Categories
                Subject: Review

                Keywords: type 1 diabetes,type 2 diabetes,diabetic nephropathy,dpp-4 inhibitors,sglt2 inhibitors,hyperfiltration
                Data availability:
                Keywords: type 1 diabetes, type 2 diabetes, diabetic nephropathy, dpp-4 inhibitors, sglt2 inhibitors, hyperfiltration

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