Special article
Solving one of the pieces of the puzzle: COVID-19 and type 2 diabetes
Resolviendo una de las piezas del puzle: COVID-19 y diabetes tipo 2
P. Pérez-Martíneza,b,
, F.J. Carrasco Sánchezc, J. Carretero Gómezd, R. Gómez-Huelgasb,e
Corresponding author
a Unidad de Lípidos y Arterioesclerosis, Hospital Universitario Reina Sofía, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Universidad de Córdoba, Córdoba, Spain
b Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Madrid, Spain
c Unidad de Insuficiencia Cardíaca, Diabetes y Riesgo Vascular, Servicio de Medicina Interna, Hospital Universitario Juan Ramón Jiménez, Huelva, Spain
d Servicio de Medicina Interna, Hospital Comarcal de Zafra, Zafra, Badajoz, Spain
e Servicio de Medicina Interna, Hospital Regional Universitario de Málaga, Instituto de Investigación Biomédica de Málaga (IBIMA), Universidad de Málaga, Málaga, Spain
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"apellidos" => "Gómez-Huelgas" "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff0010" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">e</span>" "identificador" => "aff0025" ] ] ] ] "afiliaciones" => array:5 [ 0 => array:3 [ "entidad" => "Unidad de Lípidos y Arterioesclerosis, Hospital Universitario Reina Sofía, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Universidad de Córdoba, Córdoba, Spain" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Madrid, Spain" "etiqueta" => "b" "identificador" => "aff0010" ] 2 => array:3 [ "entidad" => "Unidad de Insuficiencia Cardíaca, Diabetes y Riesgo Vascular, Servicio de Medicina Interna, Hospital Universitario Juan Ramón Jiménez, Huelva, Spain" "etiqueta" => "c" "identificador" => "aff0015" ] 3 => array:3 [ "entidad" => "Servicio de Medicina Interna, Hospital Comarcal de Zafra, Zafra, Badajoz, Spain" "etiqueta" => "d" "identificador" => "aff0020" ] 4 => array:3 [ "entidad" => "Servicio de Medicina Interna, Hospital Regional Universitario de Málaga, Instituto de Investigación Biomédica de Málaga (IBIMA), Universidad de Málaga, Málaga, Spain" "etiqueta" => "e" "identificador" => "aff0025" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Resolviendo una de las piezas del puzle: COVID-19 y diabetes tipo 2" ] ] "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">The first data from observational studies, which were later corroborated both in systemic reviews and in several meta-analyses, show that hypertension, type 2 diabetes mellitus (DM2), obesity, and coronary disease are the main comorbidities in COVID-19 infection.<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1–3</span></a> The prevalence of DM2 and the risk of complications vary widely depending on the region and series analyzed.</p><p id="par0010" class="elsevierStylePara elsevierViewall">In the Chinese population, a recent meta-analysis that includes a large number of patients (n = 76,993) demonstrated a prevalence of DM2 of 7.87% (CI 95% 3.83–12.43)<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> whereas another with 1576 patients found a figure of 9.7% (CI 95% 7.2–12.2).<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">In Italy, a randomized analysis of fatal cases of COVID-19 infection in elderly patients revealed a prevalence of DM2 of 35%<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> whereas in a retrospective study of 1591 patients hospitalized in intensive care units in the region of Lombardy (Italy), a prevalence of 17% was observed.<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">In the data collected in the USA, (n = 7162), incidence of diabetes was 6% in patients who were not hospitalized, 24% in patients who were hospitalized, and 32% in patients admitted to intensive care units.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> Along these lines, the data that we are now handling indicate that the risk of a fatal outcome due to COVID-19 is up to 50% higher in patients with DM2.<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">There are various hypotheses that could explain why these patients have a higher incidence and severity of infection. It is well-known that a person with DM2 is at greater risk for infection <span class="elsevierStyleItalic">per se</span>, mainly due to a defect in innate immunity that affects phagocytosis, the chemotaxis of neutrophils, and cellular immunity, which make them especially vulnerable.<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> It is also true that the high frequency of DM2 in severe cases of COVID-19 could simply reflect the greater prevalence of DM2 in elderly people, which is in addition to the fact that these patients also have more comorbidities, including cardiovascular disease. Therefore, despite the fact that respiratory symptoms are predominant in COVID-19 infection, DM2 is of special interest in this disease: both risk of infection with the virus and its severity are increased in these patients.<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9,10</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">The next issue that arises is what mechanisms could link COVID-19 infection with disruption of the endocrine system. The virus penetrates the cell using angiotensin-converting enzyme 2 (ACE-2) as a receptor, an exopeptidase of the membrane mainly present in the kidneys, lungs, and heart but also in other organs, such as endothelial cells and the pancreas.<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">The function of ACE-2 is the transformation of angiotensin I into angiotensin (1–9) and of angiotensin II into angiotensin (1–7). These final products have vasodilator, anti-inflammatory, and antifibrotic effects and in addition, they favor natriuresis. Therefore, they all antagonize angiotensin II action. ACE-2 has been linked to protection against hypertension, arteriosclerosis, and other vascular and pulmonary processes, including DM2.<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">In animal models, it has been observed that absence of ACE-2 gives rise to greater lung damage in acute respiratory distress syndrome and that overexpression of ACE-2 protects against it.<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">13</span></a> In humans, it has been demonstrated that acute hyperglycemia regulates the increase in expression of the ACE-2 receptor, making it easier for the virus to penetrate the cell, whereas chronic hyperglycemia favors the cells losing their protective mechanism and being more vulnerable to the proinflammatory effect that the virus provokes. Although there has been great controversy surrounding use of ACE inhibitors and ARBs since the start of the pandemic, the most recent data confirm their safety in patients with COVID-19 infection.<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">Likewise, it has been demonstrated that coronavirus infection affects both the endocrine and the exocrine pancreas.<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> Pancreaticells express ACE-2, which contributes to virus internalization and causes dysfunction in the ® cell. In this sense, preliminary data on the Italian population show that cytotoxicity cause by the virus is going to produce an insulin deficit, which could justify the presence of diabetic ketoacidosis observed in many patients upon their admission.<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">Another interesting phenomenon in patients with COVID-19 infection lies in the tremendous requirement for insulin that they need during a severe course of the infection and which must be taken into account during hospitalization.</p><p id="par0055" class="elsevierStylePara elsevierViewall">From a clinical perspective, it has been proposed that both fasting hyperglycemia and DM2 are independent predictors of morbidity and mortality in patients with acute respiratory distress syndrome.<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> In this context, a plausible hypothesis would be that the virus aggravates the characteristic low-grade chronic inflammation in patients with DM2, triggering cytokine release syndrome with a systemic, uncontrolled hyperinflammatory response resulting in the release of large quantities of proinflammatory cytokines by immune effector cells, such as the macrophages activated by the infection. In the worst-case scenario, this cytokine storm could cause acute respiratory distress syndrome with multiple organ dysfunction syndrome and, finally, would lead to death in patients with severe cases of infection. This, in part, could justify the finding observed in hospitalized patients in which poor metabolic control in patients with DM2 increased the rate of mortality.</p><p id="par0060" class="elsevierStylePara elsevierViewall">Today, there is great uncertainty about what type of antidiabetic drug would be more pathophysiologically appropriate in patients with DM2 and COVID-19 infection.<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a> An initial mechanism that could explain the relationship between COVID-19 and DM2 involves dipeptidyl peptidase-4 (DPP-4), which acts by degrading the incretin hormones GLP-1 and GIP. In cellular studies, the DPP-4 enzyme was identified as a functional receptor for the coronavirus that causes Middle East respiratory syndrome. It has been demonstrated that antibodies that target DPP-4 inhibit infection by this virus at a cellular level.<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">19</span></a></p><p id="par0065" class="elsevierStylePara elsevierViewall">The DPP-4 enzyme is a type II transmembrane glycoprotein expressed ubiquitously that plays an important role in the metabolism of glucose and insulin and which favors inflammation in DM2. The issue that arises is whether this phenomenon observed in the Middle East respiratory syndrome coronavirus can be extrapolated to COVID-19 and, thus, if treatment with DPP-4 inhibitors in clinical practice could modify the course of the infection, reducing concentrations of DPP-4 and representing a good therapeutic tool for patients with COVID-19.<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">As stated above, COVID-19 infection favors an imbalance in the renin-angiotensin-aldosterone axis which could be related to ACE-2 inhibition by the virus and due to presenting with elevated angiotensin II levels, which favors generation of secondary peptides with vasoconstrictor, proinflammatory, and sodium-retaining effects.</p><p id="par0075" class="elsevierStylePara elsevierViewall">Although the evidence available is limited, one hypothesis points to the fact that incretin drugs can produce a beneficial effect through activation of the nonclassical renin-angiotensin system pathway. This boosts the ACE axis, with a consequent increase in angiotensin (1–7) that favors anti-inflammatory, antifibrotic, natriuretic, and antiproliferative phenomena.<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a> Through this pathway, GLP-1 analogues could improve glucose and blood pressure control, reducing vascular damage. These drugs could compete with the virus itself for the ACE-2 receptor, exercising their beneficial effect through the combination of various mechanisms, including improvements in the metabolic, anti-inflammatory, and antiviral profile.</p><p id="par0080" class="elsevierStylePara elsevierViewall">In the same manner, <span class="elsevierStyleItalic">in vitro</span> studies in human renal cells treated with type 2 sodium-glucose cotransporter inhibitors have demonstrated an increase in angiotensin (1–7), with important anti-inflammatory and antifibrotic effects.</p><p id="par0085" class="elsevierStylePara elsevierViewall">A recent editorial in <span class="elsevierStyleItalic">Clinical Infectious Diseases</span> suggests that, by analogy, it is reasonable to suppose that these drugs independently activate the nonclassical pathway of the renin-angiotensin system in the lungs.<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a></p><p id="par0090" class="elsevierStylePara elsevierViewall">Finally, another hypothesis that must be explored in the future and that is related to the endotheliitis phenomenon that is generated by COVID-19 infection is of note<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a>: patients with DM2 could be more sensitive to experiencing deterioration in the systemic microcirculatory function in different beds.</p><p id="par0095" class="elsevierStylePara elsevierViewall">On this point, with our current knowledge, we can pose some clinical questions that seem evident, although there are many more to which we still do not have a response. It is fundamental that people with DM2 maintain good metabolic control, which could help reduce risk of infection as well as its severity.<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">24</span></a> This includes adequate glucose control accompanied by tight blood pressure and lipid profile control. To this end, it is important raise awareness among patients of the importance, now more than ever, of self-control. This must be accompanied by physicians’ proactive work on optimizing treatment as much as possible, considering the pros and cons of each drug, and paying particular attention to the potential interactions among antidiabetics, antihypertensives, and statins with the various treatments that are being used for COVID-19.</p><p id="par0100" class="elsevierStylePara elsevierViewall">In case of infection that does not require hospitalization, appropriate monitoring of these patients <span class="elsevierStyleItalic">via</span> telemedicine and other similar methods must be evaluated, especially in frail and elderly patients. If patients require hospitalization due to the severity of the infection, a wide range of unanswered questions arise: Do they need frequent blood glucose monitoring? What is the importance of hyper- or hypoglycemia control in isolated hospitalized patients? Is stress hypoglycemia in critical patients associated with greater morbidity and mortality? Is this stress hyperglycemia of greater relevance than having prior DM2? What occurs with the use of high doses of glucocorticoids?</p><p id="par0105" class="elsevierStylePara elsevierViewall">To respond to these and many other questions, the Spanish Internal Medicine Society has created an online registry, SEMI-COVID-19, with information (epidemiological, clinical, treatment, laboratory, and radiographic parameters) on an extensive number of patients hospitalized with SARS-CoV-2 infection confirmed by laboratories in Spanish hospitals.</p><p id="par0110" class="elsevierStylePara elsevierViewall">To sum up, the emergence of the COVID-19 pandemic is an enormous challenge. The considerable prevalence of DM2 in the current population makes the pandemic a health issue that requires all our efforts in order to provide the best possible responses to our patients, who are more vulnerable to developing the infection and are more susceptible to presenting with more severe symptoms.<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">25</span></a> In this document, some of the mechanisms that support the association between COVID-19 and DM2 have been analyzed, with the limitations inherent to current evidence.</p><p id="par0115" class="elsevierStylePara elsevierViewall">Lastly, we would like to highlight that the content of this document is based on the limited number of publications that there are on the issue to date and that, on many occasions, they are hypotheses in absence of any firm scientific evidence. Therefore, this information is susceptible to change as knowledge about COVID-19 infection evolves.</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conflicts of interest</span><p id="par0120" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest with the content included in this material.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:6 [ 0 => array:3 [ "identificador" => "xres1471342" "titulo" => "Abstract" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0005" ] ] ] 1 => array:2 [ "identificador" => "xpalclavsec1340008" "titulo" => "Keywords" ] 2 => array:3 [ "identificador" => "xres1471343" "titulo" => "Resumen" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0010" ] ] ] 3 => array:2 [ "identificador" => "xpalclavsec1340007" "titulo" => "Palabras clave" ] 4 => array:2 [ "identificador" => "sec0005" "titulo" => "Conflicts of interest" ] 5 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2020-05-04" "fechaAceptado" => "2020-05-13" "PalabrasClave" => array:2 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Keywords" "identificador" => "xpalclavsec1340008" "palabras" => array:6 [ 0 => "Type 2 diabetes mellitus" 1 => "COVID-19" 2 => "Angiotensin-converting enzyme 2" 3 => "Dipeptidyl peptidase-4 enzyme" 4 => "Sodium-glucose cotransporter 2 inhibitors" 5 => "Glucagon-like peptide analogues" ] ] ] "es" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Palabras clave" "identificador" => "xpalclavsec1340007" "palabras" => array:6 [ 0 => "Diabetes mellitus tipo 2" 1 => "COVID-19" 2 => "Enzima convertidora de angiotensina 2" 3 => "Enzima dipeptidil peptidasa 4" 4 => "Inhibidores del cotransportador sodio-glucosa tipo 2" 5 => "Análogos del péptido similar al glucagón" ] ] ] ] "tieneResumen" => true "resumen" => array:2 [ "en" => array:2 [ "titulo" => "Abstract" "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">The emergence of the COVID-19 pandemic represents an enormous challenge. Given the considerable presence of type 2 diabetes mellitus in the current population, the pandemic is a health issue that requires an effort to provide better responses to our patients who are more vulnerable to the onset of infection and who are candidates for presenting more severe symptoms. This document attempts to address the relationship between COVID-19 infection and type 2 diabetes mellitus. To this end, we will briefly analyse whether the epidemiological data support this association and, subsequently, go in depth on the pathophysiological mechanisms that might connect the two diseases.</p></span>" ] "es" => array:2 [ "titulo" => "Resumen" "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">La eclosión de la pandemia por COVID-19 supone un reto de enormes dimensiones y, dada la gran presencia de diabetes mellitus tipo2 en la población actual, hace que sea un problema de salud en el que centrar nuestros esfuerzos para dar la mejor respuesta a nuestros pacientes, que son más vulnerables al desarrollo de la infección y candidatos a presentar cuadros clínicos más graves. Este documento pretende abordar la relación entre la infección por COVID-19 y la DM2. Para ello analizaremos brevemente qué datos epidemiológicos sustentan esta asociación y, posteriormente, se profundizará en los mecanismos fisiopatológicos que podrían conectar ambas enfermedades.</p></span>" ] ] "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as: Pérez-Martínez P, Carrasco Sánchez FJ, Carretero Gómez J, Gómez-Huelgas R. Resolviendo una de las piezas del puzle: COVID-19 y diabetes tipo 2. 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| Year/Month | Html | Total | |
|---|---|---|---|
| 2024 October | 21 | 0 | 21 |
| 2024 September | 12 | 0 | 12 |
| 2024 August | 25 | 2 | 27 |
| 2024 July | 12 | 2 | 14 |
| 2024 June | 9 | 1 | 10 |
| 2024 May | 16 | 0 | 16 |
| 2024 April | 49 | 1 | 50 |
| 2024 March | 12 | 0 | 12 |
| 2024 February | 9 | 0 | 9 |
| 2024 January | 10 | 0 | 10 |
| 2023 December | 12 | 0 | 12 |
| 2023 November | 20 | 0 | 20 |
| 2023 October | 22 | 0 | 22 |
| 2023 September | 17 | 0 | 17 |
| 2023 August | 13 | 0 | 13 |
| 2023 July | 24 | 0 | 24 |
| 2023 June | 21 | 1 | 22 |
| 2023 May | 19 | 4 | 23 |
| 2023 April | 16 | 0 | 16 |
| 2023 March | 31 | 7 | 38 |
| 2023 February | 10 | 2 | 12 |
| 2023 January | 15 | 6 | 21 |
| 2022 December | 17 | 12 | 29 |
| 2022 November | 13 | 3 | 16 |
| 2022 October | 14 | 3 | 17 |
| 2022 September | 12 | 6 | 18 |
| 2022 August | 14 | 8 | 22 |
| 2022 July | 18 | 5 | 23 |
| 2022 June | 17 | 7 | 24 |
| 2022 May | 21 | 9 | 30 |
| 2022 April | 19 | 7 | 26 |
| 2022 March | 22 | 10 | 32 |
| 2022 February | 16 | 9 | 25 |
| 2022 January | 51 | 6 | 57 |
| 2021 December | 12 | 13 | 25 |
| 2021 November | 5 | 3 | 8 |
| 2021 October | 4 | 10 | 14 |
| 2021 September | 5 | 5 | 10 |
| 2021 August | 1 | 6 | 7 |
| 2021 July | 1 | 4 | 5 |
| 2021 June | 4 | 6 | 10 |
| 2021 May | 3 | 3 | 6 |
| 2021 April | 2 | 33 | 35 |
| 2021 March | 5 | 10 | 15 |
| 2021 February | 1 | 10 | 11 |
| 2021 January | 0 | 16 | 16 |
| 2020 December | 3 | 6 | 9 |
| 2020 November | 2 | 9 | 11 |
| 2020 October | 4 | 11 | 15 |
| 2020 September | 3 | 11 | 14 |
| 2020 August | 7 | 5 | 12 |
| 2020 July | 11 | 9 | 20 |
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