FB id: T Rama Prasad Reprinted from the FACEBOOK
DIABETES – new drugs … February 21, 2017
We just had a meeting of ‘Continuous Medical Education’ programme. I would not have posted this on FB as this is more of a pharmacological subject. But the home truths and the snide remarks about our drugs may be thought-provoking to the public and the doctor friends as well.
In my little talk at the meeting, I said something like the following:
“ … It is a refreshing experience to learn more about the age-old and important problem of ‘Diabetic Foot’. Thank you very much Dr. E. Thangavelu for enlightening us. This subject takes me down memory lane kindling nostalgic thoughts. It was half-a-century ago ( in 1967 -- most of you who are here now were yet to be born at that point of time ! ) when I joined as a Medical Officer at the ‘Perundurai Sanatorium’, and the first case I saw was a patient with ‘diabetic foot’ with gangrene and lung TB. There were no big corporate hospitals or diabetologists here around and there were not many alternative drugs to diabetes or TB. And today we are talking about ‘new’ anti-diabetic drugs while the incidence of diabetes and TB has been increasing enormously over the decades.
The world is currently having a great hope on the novel treatment of Type 2 diabetes by DPP-4 inhibitors. The status and the concern about the cardio-vascular safety of this new class of drugs is well-articulated by Dr. S.P. Hemanand. Thank you very much Dr. Hemanand for lucidly and comprehensively presenting the subject.
There are many DPP-4 inhibitors; some are in various stages of clinical development. The first approved DPP-4 was sitagliptin in 2006. Later, vildagliptin, saxagliptin, alogliptine, linagliptine, anagliptin and teneligliptin were introduced. Phase III studies are in progress with regard to more gliptins like denagliptin. The incretin agents (GLP-1 receptor agonists and the DPP-4 inhibitors) belong to a unique class of anti-diabetic agents.
There is a huge body of evidence of the goodness of DPP-4 inhibitors, beyond their hypoglycaemic effect. They have pleiotropic properties which improve b-cell function; reduce postprandial lipemia; lower blood pressure; improve myocardial contractility and endothelial function; and have potential neuroprotective, neurotrophic, and bone resorptive effects. These benefits of the incretins, if confirmed in long-term studies, have the potential to favourably influence the course of the disease process and its complications in patients with type 2 diabetes.
As the DPP-4 enzyme is involved not only in the regulation of glucose but also several substrates like BNP, brain natriuretic peptide; SDF-1, type 1 stromal derived factor; NPY, neuropeptide; PYY, peptide YY, DPP 4 inhibitors may have cardio-protective benefits and immune-modulating actions. Thus, they favourably modify myocardial contractility, blood pressure, cardiac output, etc. ALL THIS IS MUSIC TO THE MANUFACTURERS.
Now, let us turn to the flip side of the issue. These new drugs are ‘validated regarding surrogate outcomes’ but not about ‘real-world outcomes’. Sometimes, adverse evidence comes a bit late, often due to vested interests. Often, the “pro-industry ‘paid’ cacophony” overshadows reports of adverse reactions. Some drugs once considered to be ‘most effective and least toxic’ are now banned. Evidence is now growing to list some statins as dangerous drugs. We don’t know about the durability or long-term safety of the DPP 4 inhibitors. The jury is still out on DPP-4 inhibitors. Let us wait and see. AND, THIS IS A BITTER PILL TO THE BIG BUSINESS BARONS.
All said and done, the world is running on money, including research. The big business barons go to any extent, laughing all the way to the bank. These days, scientific evidence may be genuine or fabricated, what with all the talk about “paid research.” The evidence is too much to ignore. This reminds me of a scientific flip-flop in India. The diabetic drug, pioglitazone was ‘banned’ in India in 2013. And the government made a ‘U-turn’ and the ‘ban’ was revoked within weeks. Can any one of you tell me why such a laughable lapse occurred ? It was alleged that a DPP-4 inhibitor drug was behind the ban of pioglitazone ! There were allegations in the media and medical circles that the reason behind the ‘ban’ was based on adverse reports (bladder cancer) on pioglitazone from a diabetes research institution in India which received funds from a medical company whose new diabetes drug sitagliptin stands to gain if pioglitazone was banned. Do you think that there are genuine and scientific reasons behind the decisions ? You bet not. Lies, damned lies and drugs !
I wrote about many of such murky deals in my article titled “MODERN MEDICINE – how good is it in India ?” You may get that article by writing to me over my E-mail. It was published in the ‘Co-Chamber Journal (The Indian Chamber of Commerce and Industry)’. … ”
“Unless the thief decides to transform himself,
it is never possible to eradicate stealing.” (“ thirudanai parthu thirunthavital thirutai olika mudiyathu.”)
-- Pattukottai Kalyanasundaram
Dr. T. Rama Prasad,
drtramaprasad@gmail.com, 'PAY WHAT YOU CAN’ Clinic, Perundurai, Erode Dt., TN, India., Former Medical Superintendent (Special), RTS & IRT Perundurai Medical College and Research Centre.
Reprinted from the FACEBOOK
DIABETIC FOOT July 9, 2017
I have just returned from a Symposium on the above subject. Many people pay 'low' attention to their feet, perhaps, as they are 'low down' ! Diabetics should pay adequate attention to their feet (more than the face which is 'high up'). Otherwise, even a minor injury may make the feet end in complications. Foot has a low status in human minds. We profusely apologise when accidentally our foot just touches any part of anybody, even their foot .. but not when our hand touches. What a partiality ! Foot does more strenuous work than the hand .. hence, we have “Diabetic Foot” (disease), but not “Diabetic Hand” ! But, paradoxically, we touch the feet of somebody to express our reverence and respect, and to seek blessings ! A conundrum ! Anyway, please respect the foot. You may read about 'new' drugs in diabetes on my blog - Dr. T. Rama Prasad's Scribblings -- https://drtramaprasad.blogspot.com. – under the title ‘DIABETES’.
I had asked one of the speakers, in a lighter vein, as to whether diabetic foot problems are more in the right foot or the left. He couldn't cite any data. Traditionally, we are advised to put the right foot first, while entering a house or going up the steps. I was wondering whether the practice of always 'starting off on the right foot' makes the right foot more vulnerable to injuries and infection !
Feet have long been the subject of superstition. A mole on the sole of the left foot is said to be inauspicious. When the right foot itches, a happy travel is predicted. The right foot is associated with a positive vibe.
Dr. T. Rama Prasad, Perundurai.
SUGAR STRENGHTHENS !!!
So, diabetics must be stronger !!!
COMMENTS
Raghu Rangaswamy Hi Dr. I do accept your comments. It’s sad to say many drugs which are banned abroad citing various proven evidences are still marketed in India, which clearly indicates money can do anything in this country. I have no idea who will tie the bell to these mafias. I appreciate the recent Govt's action on bringing down the cardiac stent prices by 80% lower, the same thing should be brought on medicines too. Being in medical research I would say every medicine you take is a chemical and it’s not going to give you miracle. They bind to certain receptors which are responsible for a disease, but one can't assure the same chemical will not bind to other receptors and block the natural body function. The reason is body produces few chemicals which interacts with many receptors. For example ATP binds to nearly 300+ kinases which are involved in different body functions, when you design a kinase inhibitor even though your molecule binds to your desired kinase but it will also bind to other kinases because of the protein structural similarity. The best way one should do is to have control on the food, to change life style and to prefer natural remedies. Being in modern medicine profession, I will still give my vote to ayurveda and naturopathy. I still vouch that our ancestors were more knowledgeable than today’s technologically advanced scientists. I wonder how they identified certain herbs and plants for diseases.
Sivaraman Subramanian What a wonderful article sir ! ...Great depth of knowledge, in-depth understanding of the real situation...Great eye-opener sir.. Thanks Sir.
Solaiappathevar Narayanan Thank you Dr. T. Rama Prasad garu for your thought- provoking article.
Now, can we hope to get the desired results through stem cell therapy enhancing Beta cells of Islets of Langerhans which produce chiefly insulin. This can help overcome insulin resistance.
Our native herbal medicines should be encouraged on scientific lines.
Muthu Raja sir,i still remember the visual aid and detailing talk about tolbutamide in the year 1978.the drug metformin which is widley in use today launched after long delay in 1974.sir,you are the only doctor who has the guts to write about the real reason behind the ban of pioglitazone. All the formulations are sold with doctors prescription. Pattukottaiyar rightly said thirudanai parthu thirunthavital thirutai olika mudiyathu..
Sridhar Vatyamkumaraswami Having been in pharma marketing for about 30 years,I concur with you.Today's medico marketing is one sided.They have been bothered about converting or convincing some opinion builders, a small section of Doctors whose prescriptions are followed.
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http://www.iosrphr.org/papers/v3i3/M0331081085.pdf
Inhibition of dipeptidyl peptidase 4 (DPP-4) is a novel treatment for type-2 diabetes. DPP-4 inhibition prevents the inactivation of glucagon-like peptide 1 (GLP-1), which increases levels of active GLP-1. This increases insulin secretion and reduces glucagon secretion, thereby lowering glucose levels. Several DPP-4 inhibitors are in clinical development. Most experience so far has been with sitagliptin (Merck; approved by the FDA) and vildagliptin (Novartis; filed). These are orally active compounds with a long duration, allowing once-daily administration. Both sitagliptin and vildagliptin improve metabolic control in type-2 diabetes, both in monotherapy and in combination with metformin and thiazolidinediones. A reduction in HbA(1c) of approximately 1% is seen in studies of DPP-4 inhibition of up to 52 weeks' duration. DPP-4 inhibition is safe and well tolerated, the risk of hypoglycaemia is minimal, and DPP-4 inhibition is body-weight neutral. DPP-4 inhibition is suggested to be a first-line treatment of type-2 diabetes, particularly in its early stages in combination with metformin. However, the durability and long-term safety of DPP-4 inhibition remain to be established.
Acts when sugar increases after a meal, increases insulin levels (help lower blood sugar) and decreases glucagon (a hormone that raises blood sugar) Linagliptin (Trajenta™), Saxagliptin (Onglyza®), Sitagliptin (Januvia®) Combination agents: Linagliptin/metformin (Jentadueto®), Saxagliptin/metformin (Komboglyze™), Sitagliptin/metformin (Janumet®) In the future further gliptins (alogliptin, linagliptin, denagliptin) may be marketed, with which Phase III studies are in progress or the results have already been published. . At present, there seems to be little to distinguish between the different inhibitors in terms of their efficacy as antidiabetic agents and their safety. Long-term accumulated clinical experience will reveal whether compoundrelated characteristics lead to any clinically relevant differences.
P 1 analogues; incretins I. INTRODUCTION DPP 4 (dipeptidyl peptidase-4) inhibitors are the recently developed and approved chemical for the treatment of the diabetes mellitus. They act mainly on pancreas via inhibition of degradation of the incretin hormones such as type 1 glucagon like peptide (GLP-1), and GIP. The Incretin hormones are release from the intestine in response to oral glucose ingestion and stimulate insulin release from β-cells of pancreas (so called incretin effect), and also suppress glucagon release from α-cells of pancreas. DPP-4 inhibitors are approved for the treatment in Type 2 diabetes either as monotherapy or as add-on therapy with other oral hypoglycemic agents like metformin. There are numerous DPP4 inhibitors; some are in various stages of clinical development. The first approved DPP4 was sitagliptin in 2006. Then vildagliptin, saxagliptin, alogliptine, linagliptine, anagliptin and teneligliptin were introduced. es like Parkinson’s disease and alzeimer disease. IX. CONCLUSION The incretin agents (GLP-1 receptor agonists and the DPP-4 inhibitors) belong to a unique class of antidiabetic agents. These agents have pleiotropic effects that extend beyond their known ability to lower glucose. These include effects to improve b-cell function and mediation of trophic effects on the b-cell (in animal and in vitro models); effects to reduce postprandial lipemia; effects to lower blood pressure; effects to improve myocardial contractility and endothelial function; and potential neuroprotective, neurotrophic, and bone resorptive effects (seen only in animal models). These beneficial effects of the incretins (if confirmed in longterm studies) have the potential to favorably influence the course of the disease process and its complications in patients with type 2 diabetes.
DPP 4 (dipeptidyl peptidase-4) inhibitors: beyond glycemic control 83 III. CARDIOVASCULAR PROTECTION Effect on Myocardial function Heart failure, myocardial infarction, cardiac hypertrophy and coronary artery disease is often associated with diabetes and metabolic syndrome. As the DPP-4 enzyme is involved not only in the regulation of glucose but also several substrates (like BNP,brain natriuretic peptide; SDF-1, type 1 stromal derived factor; NPY, neuropeptide; PYY, peptide YY) known to have cardiovascular, renal and immune-modulating actions. Thus long-term DPP-4 inhibition may have clinical benefits and/or consequences including cardioprotective actions. Effects on contractility, blood pressure, cardiac output and cardioprotection appear to be independent of diabetes [12-19] . A few studies have been published on cardioprotective effect of GLP-1 analogues and DPP 4 inhibitors. In studies done on mice genetically lacking the DPP-4 receptors that were treated with sitagliptin, the investigators induced acute myocardial infarction by left anterior descending coronary artery ligation (20). In these mice, an upregulation of cardio-protective genes and their protein products was shown. In another study in mice, it was shown that treatment with sitagliptin can reduce the infarct area and the protective effect of sitagliptin was protein kinase A dependent (21) . In diabetic patients who suffer from ischemic heart disease, it was demonstrated that treatment with sitagliptin improved their heart function and coronary artery perfusion, as observed in echodebutamin tests (22) . IV. EFFECT ON BLOOD PRESSURE The effect of DPP 4 inhibitors on blood pressure is contradictory. In diabetic rats, sitagliptin was associated with a significant normalization of blood pressure in diabetic rats with elevated blood pressure (versus non-diabetic rats)(23) , whereas vildagliptin showed no influence on blood pressure in hypertensive fatty rats (24). Recently, a study by Marney et al.(25), in metabolic syndrome patients, showed that during placebo and low-dose ACE inhibition (5 mg enalapril), sitagliptin lowered blood pressure. However, this trend was reversed during higher-dose acute ACE inhibition (10 mg enalapril). They hypothesized that the combination of sitagliptin and high-dose ACE inhibition causes activation of the sympathetic tone, hence attenuating blood pressure reduction. Marney et al. suggested that high levels of substance P, because of the double blockade of ACE and DPP-4, caused the activation of the sympathetic system. V. ENDOTHELIAL FUNCTION Endothelia dysfunction is an independent predictor for cardiovascular events in patients with type 2 diabetes. In some studies it was found that GLP-1 has some vasodilatory action and Sitagliptin significantly improved endothelial function and inflammatory state in patients with coronary artery disease and uncontrolled diabetes mellitus. VI. LIPID METABOLISM DPP 4 inhibitors found to decrease the postprandial surge in lipid levels. Matikainen et al.(26) in his study found that treatment with vildagliptin for 4 weeks improves postprandial plasma triglyceride and apolipoprotein B-48–containing triglyceride-rich lipoprotein particle metabolism after a fat-rich meal in drugnaive patients with type 2diabetes. Hsieh et al. (27) also suggested that DPP 4 inhibitors augment the level of GLP-1receptors thus reduce secretion of tryglycerol, cholesterol, and apolipoprotein B-40 from intestine. Antiatherosclerotic effect has been found in some model by reducing media-intima ratio in carotid artery of rat in dose dependent manner.
ulature. 3.4 Cardiovascular effects Although it summarized the results of studies with non-cardiovascular endpoints, a metaanalysis investigating the safety of sitagliptin (100mg/day) showed no substantial differences as compared to the control group in relation to coronary artery disease (0.2 vs. 0.4 event per 100 patient-years), myocardial ischemia (0.0 vs. 0.2 event per 100 patient-years) and acute myocardial infarction (0.1 vs. 0.2 event per 100 patient-years) respectively (Williams-Herman, Engel et al. 2010). A post hoc metaanalysis of saxagliptin’s effect on major cardiovascular events (CV death, non-fatal MI, non-fatal stroke) showed no increase of CV risk in the treated patients (Wolf, Friedrich et al. 2009). Recently, a large outcome trial with sitagliptin (A randomized placebo controlled clinical Trial to Evaluate Cardiovascular Outcomes after treatment with Sitagliptin in patients with type 2 diabetes mellitus and inadequate glycaemic control on mono or dual combination oral antihyperglycaemic therapy, TECOS) and with saxagliptin (Saxagliptin Assessment of Vascular Outcomes Recorded in patients with diabetes mellitus, SAVOR-TIMI 53) has been started. GLP-1 receptors can be found in cardiac muscle cells and vascular endothelial cells as well (Nauck and Smith 2009; Nikolaidis, Mankad et al. 2004). The beneficial effect of GLP-1 has been demonstrated also in coronary ischemia and left ventricular failure both in animal experiments and in human studies (Nikolaidis, Mankad et al. 2004; Bose, Mocanu et al. 2005; Nikolaidis, Elahi et al. 2004). In rats, myocardial necrosis developed in a smaller area when they received GLP-1 infusion (Bose, Mocanu et al. 2005). Following intravenous infusion of GLP-1, less wall motion disorder and better left ventricular function developed in patients with and without type 2 diabetes who had undergone angioplasty after acute myocardial infarction (Nikolaidis, Mankad et al. 2004). Based on these, a beneficial effect of DPP-4 inhibitors on cardiovascular disease may be presumed, however further long-term clinical studies with a high number of patients are required for an exact elucidation. www.intechopen.com
In addition to severe joint pain, other possible side effects of DPP-4 inhibitors include inflammation of the pancreas, low blood sugar when this class of medicines is combined with other prescription medicines used to treat diabetes, and allergic reactions.
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