Study investigates statin-diabetes link

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Tue, 05/03/2022 - 15:16

 

– On any given day, type “statins” in the subject line of your favorite search engine and many results are likely to focus on risks: some based on science, others not so much.

Dr. Joshua Knowles, Stanford Center for Inherited Cardiac Disease
Doug Brunk/MDedge News
Dr. Joshua W. Knowles

“There is all kind of misinformation that are preventing people from taking statins,” Joshua W. Knowles, MD, said at the World Congress on Insulin Resistance, Diabetes & Cardiovascular Disease. “The most important side effects of statins are the increased lifespan and decreased risk of heart attacks, but that’s not what our patients are telling us. One of the things that is true is that statins do seem to increase the risk of diabetes. This only emerged after many years and it’s gotten a lot of press.”

In 2016, Dr. Knowles, a cardiologist at the Stanford (Calif.) Center for Inherited Cardiovascular Disease, coauthored a retrospective analysis of data from subjects without diabetes in the Treating to New Targets (TNT) and the Stroke Prevention by Aggressive Reduction in Cholesterol Levels (SPARCL) randomized controlled trials (Am J Cardiol 2016;118[9]:1275-81). The authors found that statins particularly increase the risk of type 2 diabetes in those with prediabetes and insulin resistance. “That’s a risk group that we are all treating,” he said. “But that still doesn’t answer the question as to why this happens. Is this because statins increase insulin resistance, because they decrease beta cell function, or because they increase insulin clearance rate?”

In an effort to find out, Dr. Knowles and his colleagues have launched a clinical trial entitled “Relationship Between Insulin Resistance and Statin Induced Type 2 Diabetes, and Integrative Personal Omics Profiling” (NCT 02437084). Candidates do not have diabetes, yet qualify for statin therapy because they have a greater than 7.5% risk of cardiovascular disease over 10 years. To date, the researchers have enrolled 74 patients: 42 to the insulin-sensitive group (defined as having an LDL above 130 mg/dL and a triglyceride level below 150 mg/dL) and 11 to the insulin-resistant group (defined as having an LDL of 130 mg/dL or greater and a triglyceride level of 150 mg/dL or greater). Dr. Knowles said that about two-thirds of patients have been recruited and that full results are expected in late 2019.



At baseline, subjects underwent the insulin suppression test, the graded glucose infusion test, metabolic characterization, and integrated personal omics profiling (iPOP), a monitoring method. After 3 months of atorvastatin therapy 40 mg/day, the researchers repeated these measures and compared the results between groups. “Basically we were looking for changes in insulin resistance, secretion, and clearance between those groups over time,” said Dr. Knowles, who is the study’s principal investigator.

Of the 74 subjects, 13 decided that they did not want to participate and 6 are still undergoing baseline tests. In all, 55 started statin therapy, and 2 have dropped out. This left 42 in the low-triglyceride group and 11 in the high-triglyceride group.

The average age of the 52 individuals who have completed the study so far is 61 years, 30 are male, 35 are non-Hispanic white, their mean body mass index was 27.9 kg/m2, and their mean blood pressure was 127/79 mm Hg. By the end of statin therapy, body mass index did not change, but total cholesterol fell from a median of 234 mg/dL to a median of 150 mg/dL, triglycerides fell from a median of 109 mg/dL to a median of 78 mg/dL, LDL cholesterol fell from a median of 153 mg/dL to a median of 71 mg/dL, and mean high-sensitivity C-reactive protein dropped from a median of 1.2 mg/L to a median of 0.8 mg/L. All differences were statistically significant.

Fasting glucose levels have been completed on only 35 patients. “Two-hour glucose is going up, but it’s not yet significant, and on the oral glucose tolerance test, the curves are separating slightly but are not yet significant,” Dr. Knowles said.

On average, insulin resistance among the 35 patients worsened slightly, from 156 mg/dL before statin therapy to 170 mg/dL after initiation. “This is nominally significant (P = 0.03), and we’ll have to see if this holds up over time,” he said. The researchers also observed that statin use was associated with slight decreases in insulin secretion and clearance. Dr. Knowles emphasized that these are preliminary results and need to be further validated.

The study is funded by the Doris Duke Charitable Foundation. Dr. Knowles reported having no disclosures.

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– On any given day, type “statins” in the subject line of your favorite search engine and many results are likely to focus on risks: some based on science, others not so much.

Dr. Joshua Knowles, Stanford Center for Inherited Cardiac Disease
Doug Brunk/MDedge News
Dr. Joshua W. Knowles

“There is all kind of misinformation that are preventing people from taking statins,” Joshua W. Knowles, MD, said at the World Congress on Insulin Resistance, Diabetes & Cardiovascular Disease. “The most important side effects of statins are the increased lifespan and decreased risk of heart attacks, but that’s not what our patients are telling us. One of the things that is true is that statins do seem to increase the risk of diabetes. This only emerged after many years and it’s gotten a lot of press.”

In 2016, Dr. Knowles, a cardiologist at the Stanford (Calif.) Center for Inherited Cardiovascular Disease, coauthored a retrospective analysis of data from subjects without diabetes in the Treating to New Targets (TNT) and the Stroke Prevention by Aggressive Reduction in Cholesterol Levels (SPARCL) randomized controlled trials (Am J Cardiol 2016;118[9]:1275-81). The authors found that statins particularly increase the risk of type 2 diabetes in those with prediabetes and insulin resistance. “That’s a risk group that we are all treating,” he said. “But that still doesn’t answer the question as to why this happens. Is this because statins increase insulin resistance, because they decrease beta cell function, or because they increase insulin clearance rate?”

In an effort to find out, Dr. Knowles and his colleagues have launched a clinical trial entitled “Relationship Between Insulin Resistance and Statin Induced Type 2 Diabetes, and Integrative Personal Omics Profiling” (NCT 02437084). Candidates do not have diabetes, yet qualify for statin therapy because they have a greater than 7.5% risk of cardiovascular disease over 10 years. To date, the researchers have enrolled 74 patients: 42 to the insulin-sensitive group (defined as having an LDL above 130 mg/dL and a triglyceride level below 150 mg/dL) and 11 to the insulin-resistant group (defined as having an LDL of 130 mg/dL or greater and a triglyceride level of 150 mg/dL or greater). Dr. Knowles said that about two-thirds of patients have been recruited and that full results are expected in late 2019.



At baseline, subjects underwent the insulin suppression test, the graded glucose infusion test, metabolic characterization, and integrated personal omics profiling (iPOP), a monitoring method. After 3 months of atorvastatin therapy 40 mg/day, the researchers repeated these measures and compared the results between groups. “Basically we were looking for changes in insulin resistance, secretion, and clearance between those groups over time,” said Dr. Knowles, who is the study’s principal investigator.

Of the 74 subjects, 13 decided that they did not want to participate and 6 are still undergoing baseline tests. In all, 55 started statin therapy, and 2 have dropped out. This left 42 in the low-triglyceride group and 11 in the high-triglyceride group.

The average age of the 52 individuals who have completed the study so far is 61 years, 30 are male, 35 are non-Hispanic white, their mean body mass index was 27.9 kg/m2, and their mean blood pressure was 127/79 mm Hg. By the end of statin therapy, body mass index did not change, but total cholesterol fell from a median of 234 mg/dL to a median of 150 mg/dL, triglycerides fell from a median of 109 mg/dL to a median of 78 mg/dL, LDL cholesterol fell from a median of 153 mg/dL to a median of 71 mg/dL, and mean high-sensitivity C-reactive protein dropped from a median of 1.2 mg/L to a median of 0.8 mg/L. All differences were statistically significant.

Fasting glucose levels have been completed on only 35 patients. “Two-hour glucose is going up, but it’s not yet significant, and on the oral glucose tolerance test, the curves are separating slightly but are not yet significant,” Dr. Knowles said.

On average, insulin resistance among the 35 patients worsened slightly, from 156 mg/dL before statin therapy to 170 mg/dL after initiation. “This is nominally significant (P = 0.03), and we’ll have to see if this holds up over time,” he said. The researchers also observed that statin use was associated with slight decreases in insulin secretion and clearance. Dr. Knowles emphasized that these are preliminary results and need to be further validated.

The study is funded by the Doris Duke Charitable Foundation. Dr. Knowles reported having no disclosures.

 

– On any given day, type “statins” in the subject line of your favorite search engine and many results are likely to focus on risks: some based on science, others not so much.

Dr. Joshua Knowles, Stanford Center for Inherited Cardiac Disease
Doug Brunk/MDedge News
Dr. Joshua W. Knowles

“There is all kind of misinformation that are preventing people from taking statins,” Joshua W. Knowles, MD, said at the World Congress on Insulin Resistance, Diabetes & Cardiovascular Disease. “The most important side effects of statins are the increased lifespan and decreased risk of heart attacks, but that’s not what our patients are telling us. One of the things that is true is that statins do seem to increase the risk of diabetes. This only emerged after many years and it’s gotten a lot of press.”

In 2016, Dr. Knowles, a cardiologist at the Stanford (Calif.) Center for Inherited Cardiovascular Disease, coauthored a retrospective analysis of data from subjects without diabetes in the Treating to New Targets (TNT) and the Stroke Prevention by Aggressive Reduction in Cholesterol Levels (SPARCL) randomized controlled trials (Am J Cardiol 2016;118[9]:1275-81). The authors found that statins particularly increase the risk of type 2 diabetes in those with prediabetes and insulin resistance. “That’s a risk group that we are all treating,” he said. “But that still doesn’t answer the question as to why this happens. Is this because statins increase insulin resistance, because they decrease beta cell function, or because they increase insulin clearance rate?”

In an effort to find out, Dr. Knowles and his colleagues have launched a clinical trial entitled “Relationship Between Insulin Resistance and Statin Induced Type 2 Diabetes, and Integrative Personal Omics Profiling” (NCT 02437084). Candidates do not have diabetes, yet qualify for statin therapy because they have a greater than 7.5% risk of cardiovascular disease over 10 years. To date, the researchers have enrolled 74 patients: 42 to the insulin-sensitive group (defined as having an LDL above 130 mg/dL and a triglyceride level below 150 mg/dL) and 11 to the insulin-resistant group (defined as having an LDL of 130 mg/dL or greater and a triglyceride level of 150 mg/dL or greater). Dr. Knowles said that about two-thirds of patients have been recruited and that full results are expected in late 2019.



At baseline, subjects underwent the insulin suppression test, the graded glucose infusion test, metabolic characterization, and integrated personal omics profiling (iPOP), a monitoring method. After 3 months of atorvastatin therapy 40 mg/day, the researchers repeated these measures and compared the results between groups. “Basically we were looking for changes in insulin resistance, secretion, and clearance between those groups over time,” said Dr. Knowles, who is the study’s principal investigator.

Of the 74 subjects, 13 decided that they did not want to participate and 6 are still undergoing baseline tests. In all, 55 started statin therapy, and 2 have dropped out. This left 42 in the low-triglyceride group and 11 in the high-triglyceride group.

The average age of the 52 individuals who have completed the study so far is 61 years, 30 are male, 35 are non-Hispanic white, their mean body mass index was 27.9 kg/m2, and their mean blood pressure was 127/79 mm Hg. By the end of statin therapy, body mass index did not change, but total cholesterol fell from a median of 234 mg/dL to a median of 150 mg/dL, triglycerides fell from a median of 109 mg/dL to a median of 78 mg/dL, LDL cholesterol fell from a median of 153 mg/dL to a median of 71 mg/dL, and mean high-sensitivity C-reactive protein dropped from a median of 1.2 mg/L to a median of 0.8 mg/L. All differences were statistically significant.

Fasting glucose levels have been completed on only 35 patients. “Two-hour glucose is going up, but it’s not yet significant, and on the oral glucose tolerance test, the curves are separating slightly but are not yet significant,” Dr. Knowles said.

On average, insulin resistance among the 35 patients worsened slightly, from 156 mg/dL before statin therapy to 170 mg/dL after initiation. “This is nominally significant (P = 0.03), and we’ll have to see if this holds up over time,” he said. The researchers also observed that statin use was associated with slight decreases in insulin secretion and clearance. Dr. Knowles emphasized that these are preliminary results and need to be further validated.

The study is funded by the Doris Duke Charitable Foundation. Dr. Knowles reported having no disclosures.

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Should metabolic syndrome be renamed circadian syndrome?

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Tue, 05/03/2022 - 15:16

 

– In the opinion of Paul Zimmet, MD, PhD, the Western 24/7 lifestyle is plagued by chronic sleep insufficiency, continual caloric excess, modernization, and globalization, which all can cause disruption of circadian rhythm.

Dr. Paul Zimmet of Monash University, Melbourne
Doug Brunk/MDedge News
Dr. Paul Zimmet

This scenario created the “perfect storm” for rising rates of metabolic syndrome, which is related to low HDL cholesterol levels, central obesity, hypertension, hyperglycemia, and high triglyceride levels, Dr. Zimmet said at the World Congress on Insulin Resistance, Diabetes & Cardiovascular Disease. These cardiometabolic risk factors “all seem to cluster together in relation to the changes in our society,” he said. “It’s on that basis and research findings that I think we should understand that most of them, if not all, have been demonstrated to relate to circadian rhythm disturbance.”

In fact, the associated comorbidities sleep apnea, depression, and fatty liver disease should be included in the metabolic syndrome cluster and should be renamed the “circadian syndrome,” according to Dr. Zimmet, professor of diabetes at Monash University, Melbourne.

The term metabolic syndrome is anathema, he said. “There have been numerous different definitions, which finally led to an effort to come up with a harmonized definition” by the International Diabetes Federation Task Force on Epidemiology and Prevention, with involvement from the American Heart Association (Circulation 2009;120[16]:1640-5).

In the early 1970s, Dr. Zimmet and his colleagues at Guys Hospital in London reported on diurnal variation in glucose tolerance. “If you did a glucose tolerance test in the afternoon it could be diabetic, whereas in the morning it was normal,” he noted. “Other researchers reported similar findings. That created in my own mind interest in this area of circadian rhythm. However, I had neglected this until recently, when I was doing background research while trying to find an answer to the elusive question of a central uniting explanation for the cardiometabolic cluster constituting the metabolic syndrome.” So decades later, Dr. Zimmet extended his research to include epigenetics in the quest. Described as the study of heritable changes in gene function that occur without a change in the sequence of the DNA, epigenetic changes “are closely linked to the circadian rhythm, otherwise known as ‘the body clock,’ ” said Dr. Zimmet, who also is codirector with Naftali Stern, MD, of the Sagol Center for Epigenetics of Metabolism and Aging at Tel Aviv Medical Center. “Many aspects of human behavior and metabolism are closely linked to the circadian clock and affected by its rhythm disturbance. We decided that we wanted to further investigate this area: To what extent is circadian rhythm the central feature to explain the clustering of all of these cardiovascular and metabolic risk factors of the metabolic syndrome.”



In recent years, he has been collaborating with Noga Kronfeld-Schor, PhD, of the department of zoology at Tel Aviv (Israel) University. The research focuses on a gerbil from the Negev: Psammomys obesus (otherwise known as the Israeli fat sand rat), which develops elevated blood sugar, obesity, depression, sleep disturbance, fatty liver, and circadian dysrhythmia when removed from the desert environment to the laboratory. “These are all key features of type 2 diabetes in humans,” he said. “This is probably the best animal model of type 2 diabetes, and we felt that it was worth looking more closely to see if there was a similar relationship in humans as to whether circadian dysrhythmia would be causing all or most of these features in humans including obesity.” An epigenetic study of the gerbil in the laboratory of Prof. Sam El-Osta at Monash has shown that parental diet during early life regulated expression of genes associated with DNA methylation in the key FTO gene associated with obesity (Int J Obesity 2016;40:1079-88). It suggests that diet-induced metabolic changes can be transmitted from parent to offspring by mechanisms under epigenetic control.

Published studies from other research groups support the link between other of the cardiometabolic metabolic syndrome characteristics, epigenetic modifications, and circadian dysrhythmia including cardiovascular regulation and disease (Eur Heart J 2018;39[14]:2326-9), sleep loss and alterations in DNA methylation (Science Advances 2018;4[8]:eaar8590), and circadian dysrhythmia and fatty liver (Cell Metab 2012;15[6]:848-60). “In 2009, the FDA approved bromocriptine mesylate, a drug which has effects on circadian rhythm, for treatment of type 2 diabetes, suggesting its use in diabetes may have some role through the alteration of circadian rhythm,” continued Dr. Zimmet, who also is honorary president of the International Diabetes Federation. “Depression is also clearly linked to circadian rhythm and there is evidence from research and human studies that light therapy may be an effective treatment for type 2 diabetes and depression.”

Dr. Zimmet ended his presentation with a strong call for adding sleep apnea, fatty liver, and depression to the existing features of the metabolic syndrome “to encourage clinicians and researchers look at the picture of cardiometabolic risk much more broadly than as just a group of metabolic abnormalities,” he said. “We propose that these comorbidities be embraced within the definition of the cardiometabolic cluster and be renamed the ‘circadian syndrome.’ This cluster is now the main driver of the global chronic disease epidemic and its health burden. This is a disease of civilization – the result of the way we live.”

Dr. Zimmet reported having no disclosures.

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– In the opinion of Paul Zimmet, MD, PhD, the Western 24/7 lifestyle is plagued by chronic sleep insufficiency, continual caloric excess, modernization, and globalization, which all can cause disruption of circadian rhythm.

Dr. Paul Zimmet of Monash University, Melbourne
Doug Brunk/MDedge News
Dr. Paul Zimmet

This scenario created the “perfect storm” for rising rates of metabolic syndrome, which is related to low HDL cholesterol levels, central obesity, hypertension, hyperglycemia, and high triglyceride levels, Dr. Zimmet said at the World Congress on Insulin Resistance, Diabetes & Cardiovascular Disease. These cardiometabolic risk factors “all seem to cluster together in relation to the changes in our society,” he said. “It’s on that basis and research findings that I think we should understand that most of them, if not all, have been demonstrated to relate to circadian rhythm disturbance.”

In fact, the associated comorbidities sleep apnea, depression, and fatty liver disease should be included in the metabolic syndrome cluster and should be renamed the “circadian syndrome,” according to Dr. Zimmet, professor of diabetes at Monash University, Melbourne.

The term metabolic syndrome is anathema, he said. “There have been numerous different definitions, which finally led to an effort to come up with a harmonized definition” by the International Diabetes Federation Task Force on Epidemiology and Prevention, with involvement from the American Heart Association (Circulation 2009;120[16]:1640-5).

In the early 1970s, Dr. Zimmet and his colleagues at Guys Hospital in London reported on diurnal variation in glucose tolerance. “If you did a glucose tolerance test in the afternoon it could be diabetic, whereas in the morning it was normal,” he noted. “Other researchers reported similar findings. That created in my own mind interest in this area of circadian rhythm. However, I had neglected this until recently, when I was doing background research while trying to find an answer to the elusive question of a central uniting explanation for the cardiometabolic cluster constituting the metabolic syndrome.” So decades later, Dr. Zimmet extended his research to include epigenetics in the quest. Described as the study of heritable changes in gene function that occur without a change in the sequence of the DNA, epigenetic changes “are closely linked to the circadian rhythm, otherwise known as ‘the body clock,’ ” said Dr. Zimmet, who also is codirector with Naftali Stern, MD, of the Sagol Center for Epigenetics of Metabolism and Aging at Tel Aviv Medical Center. “Many aspects of human behavior and metabolism are closely linked to the circadian clock and affected by its rhythm disturbance. We decided that we wanted to further investigate this area: To what extent is circadian rhythm the central feature to explain the clustering of all of these cardiovascular and metabolic risk factors of the metabolic syndrome.”



In recent years, he has been collaborating with Noga Kronfeld-Schor, PhD, of the department of zoology at Tel Aviv (Israel) University. The research focuses on a gerbil from the Negev: Psammomys obesus (otherwise known as the Israeli fat sand rat), which develops elevated blood sugar, obesity, depression, sleep disturbance, fatty liver, and circadian dysrhythmia when removed from the desert environment to the laboratory. “These are all key features of type 2 diabetes in humans,” he said. “This is probably the best animal model of type 2 diabetes, and we felt that it was worth looking more closely to see if there was a similar relationship in humans as to whether circadian dysrhythmia would be causing all or most of these features in humans including obesity.” An epigenetic study of the gerbil in the laboratory of Prof. Sam El-Osta at Monash has shown that parental diet during early life regulated expression of genes associated with DNA methylation in the key FTO gene associated with obesity (Int J Obesity 2016;40:1079-88). It suggests that diet-induced metabolic changes can be transmitted from parent to offspring by mechanisms under epigenetic control.

Published studies from other research groups support the link between other of the cardiometabolic metabolic syndrome characteristics, epigenetic modifications, and circadian dysrhythmia including cardiovascular regulation and disease (Eur Heart J 2018;39[14]:2326-9), sleep loss and alterations in DNA methylation (Science Advances 2018;4[8]:eaar8590), and circadian dysrhythmia and fatty liver (Cell Metab 2012;15[6]:848-60). “In 2009, the FDA approved bromocriptine mesylate, a drug which has effects on circadian rhythm, for treatment of type 2 diabetes, suggesting its use in diabetes may have some role through the alteration of circadian rhythm,” continued Dr. Zimmet, who also is honorary president of the International Diabetes Federation. “Depression is also clearly linked to circadian rhythm and there is evidence from research and human studies that light therapy may be an effective treatment for type 2 diabetes and depression.”

Dr. Zimmet ended his presentation with a strong call for adding sleep apnea, fatty liver, and depression to the existing features of the metabolic syndrome “to encourage clinicians and researchers look at the picture of cardiometabolic risk much more broadly than as just a group of metabolic abnormalities,” he said. “We propose that these comorbidities be embraced within the definition of the cardiometabolic cluster and be renamed the ‘circadian syndrome.’ This cluster is now the main driver of the global chronic disease epidemic and its health burden. This is a disease of civilization – the result of the way we live.”

Dr. Zimmet reported having no disclosures.

 

– In the opinion of Paul Zimmet, MD, PhD, the Western 24/7 lifestyle is plagued by chronic sleep insufficiency, continual caloric excess, modernization, and globalization, which all can cause disruption of circadian rhythm.

Dr. Paul Zimmet of Monash University, Melbourne
Doug Brunk/MDedge News
Dr. Paul Zimmet

This scenario created the “perfect storm” for rising rates of metabolic syndrome, which is related to low HDL cholesterol levels, central obesity, hypertension, hyperglycemia, and high triglyceride levels, Dr. Zimmet said at the World Congress on Insulin Resistance, Diabetes & Cardiovascular Disease. These cardiometabolic risk factors “all seem to cluster together in relation to the changes in our society,” he said. “It’s on that basis and research findings that I think we should understand that most of them, if not all, have been demonstrated to relate to circadian rhythm disturbance.”

In fact, the associated comorbidities sleep apnea, depression, and fatty liver disease should be included in the metabolic syndrome cluster and should be renamed the “circadian syndrome,” according to Dr. Zimmet, professor of diabetes at Monash University, Melbourne.

The term metabolic syndrome is anathema, he said. “There have been numerous different definitions, which finally led to an effort to come up with a harmonized definition” by the International Diabetes Federation Task Force on Epidemiology and Prevention, with involvement from the American Heart Association (Circulation 2009;120[16]:1640-5).

In the early 1970s, Dr. Zimmet and his colleagues at Guys Hospital in London reported on diurnal variation in glucose tolerance. “If you did a glucose tolerance test in the afternoon it could be diabetic, whereas in the morning it was normal,” he noted. “Other researchers reported similar findings. That created in my own mind interest in this area of circadian rhythm. However, I had neglected this until recently, when I was doing background research while trying to find an answer to the elusive question of a central uniting explanation for the cardiometabolic cluster constituting the metabolic syndrome.” So decades later, Dr. Zimmet extended his research to include epigenetics in the quest. Described as the study of heritable changes in gene function that occur without a change in the sequence of the DNA, epigenetic changes “are closely linked to the circadian rhythm, otherwise known as ‘the body clock,’ ” said Dr. Zimmet, who also is codirector with Naftali Stern, MD, of the Sagol Center for Epigenetics of Metabolism and Aging at Tel Aviv Medical Center. “Many aspects of human behavior and metabolism are closely linked to the circadian clock and affected by its rhythm disturbance. We decided that we wanted to further investigate this area: To what extent is circadian rhythm the central feature to explain the clustering of all of these cardiovascular and metabolic risk factors of the metabolic syndrome.”



In recent years, he has been collaborating with Noga Kronfeld-Schor, PhD, of the department of zoology at Tel Aviv (Israel) University. The research focuses on a gerbil from the Negev: Psammomys obesus (otherwise known as the Israeli fat sand rat), which develops elevated blood sugar, obesity, depression, sleep disturbance, fatty liver, and circadian dysrhythmia when removed from the desert environment to the laboratory. “These are all key features of type 2 diabetes in humans,” he said. “This is probably the best animal model of type 2 diabetes, and we felt that it was worth looking more closely to see if there was a similar relationship in humans as to whether circadian dysrhythmia would be causing all or most of these features in humans including obesity.” An epigenetic study of the gerbil in the laboratory of Prof. Sam El-Osta at Monash has shown that parental diet during early life regulated expression of genes associated with DNA methylation in the key FTO gene associated with obesity (Int J Obesity 2016;40:1079-88). It suggests that diet-induced metabolic changes can be transmitted from parent to offspring by mechanisms under epigenetic control.

Published studies from other research groups support the link between other of the cardiometabolic metabolic syndrome characteristics, epigenetic modifications, and circadian dysrhythmia including cardiovascular regulation and disease (Eur Heart J 2018;39[14]:2326-9), sleep loss and alterations in DNA methylation (Science Advances 2018;4[8]:eaar8590), and circadian dysrhythmia and fatty liver (Cell Metab 2012;15[6]:848-60). “In 2009, the FDA approved bromocriptine mesylate, a drug which has effects on circadian rhythm, for treatment of type 2 diabetes, suggesting its use in diabetes may have some role through the alteration of circadian rhythm,” continued Dr. Zimmet, who also is honorary president of the International Diabetes Federation. “Depression is also clearly linked to circadian rhythm and there is evidence from research and human studies that light therapy may be an effective treatment for type 2 diabetes and depression.”

Dr. Zimmet ended his presentation with a strong call for adding sleep apnea, fatty liver, and depression to the existing features of the metabolic syndrome “to encourage clinicians and researchers look at the picture of cardiometabolic risk much more broadly than as just a group of metabolic abnormalities,” he said. “We propose that these comorbidities be embraced within the definition of the cardiometabolic cluster and be renamed the ‘circadian syndrome.’ This cluster is now the main driver of the global chronic disease epidemic and its health burden. This is a disease of civilization – the result of the way we live.”

Dr. Zimmet reported having no disclosures.

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