Introduction
Psoriatic arthritis (PsA) is a chronic autoinflammatory condition distinguished by a variety of clinical phenotypes. It is most frequently associated with patients who have psoriasis (PsO). It is a devastating form of spondyloarthropathy that significantly affects patients life and increases cardiovascular mortality and mortality in general.1,2 Based on a rising awareness and knowledge of the immunologic mechanism, psoriatic disease is increasingly being regarded as a systemic disease, the consequences of which impact more than skin and joint health.3,4 The interest in determining the cardiovascular (CV) disease risk factors linked to PsA and PsO has intensified, with most of the early data and the underlying pathogenetic theories informed by the literature on rheumatoid arthritis (RA).5,6 Retrospective and prospective data from the large observational cohort, and evidence gleaned from various imaging techniques, show that PsO and PsA are linked to increased CV risk.4,7,8 Previous studies also indicate that CV diseases are the leading etiology for deaths in PsA patients, accounting for between 20% and 56% of those deaths.9,10 A relationship has been established in previous studies between increased risk of contracting CV disease in PsA and the existence of cardiometabolic risk factors, namely high blood pressure, adiposity, diabetes, hyperlipidemia, and chronic system inflammation.11 Moreover, the prevalence of MetS, described as an amalgamation of the risk factors mentioned above, is also higher in individuals diagnosed with PsA.
Metabolic syndrome denotes a collection of metabolic risk factors that increase the probability that CV disease will develop. Since the 1940s, there has been evidence that some metabolic abnormalities are associated with CV disease. Insulin resistance (IR), hypertension (HTN), abnormal cholesterol levels, and obesity are examples of these metabolic factors.
Metabolic syndrome is a grouping of five traditional CV risk factors. There are five distinct MetS definitions.1214 However, it has been proven that the various definitions of MetS are comparable in terms of prognosis and therapy.15 According to the most widely used current guidelines, which were revised by the National Heart, Lung, and Blood Institute (NHLBI) as well as the American Heart Association (AHA) in the United States in 2005, the diagnosis of MetS can be made if an individual has a minimum of three out of five of the conditions listed in Table 1.13
Table 1 Definition of Metabolic Syndrome According to AHA/NHLBI Revised in 2005
Metabolic syndrome is increasing in importance as a worldwide health concern. It is typically asymptomatic but significantly influences general health, mainly by increasing the risk of CV disease.
Psoriatic arthritis, Metabolic syndrome, and atherosclerosis may have overlapping inflammatory pathways and genetic predispositions in their underlying pathophysiology (Figure 1). There is an increased prevalence of chronic inflammation mediated by Th1 and Th-17 with cytokine dysregulation in PsA.16,17
Figure 1 The link between inflammation, psoriatic arthritis, and metabolic syndrome; Obesity is one of the important components of metabolic syndrome and is a well-known risk factor for psoriatic arthritis. Both obesity and PsA share a complex relationship that is likely bidirectional. Increased pro-inflammatory cytokines, secretion of adipocytokines from adipose tissue, increased of oxidative and endoplasmic reticulum stress, and dysbiosis of intestinal microbiota all play a role in the development of MetS and increase the risk of cardiovascular disease in psoriatic patients.
The pathogenesis of PsA is complicated and poorly known; The most widely acknowledged hypothesis involves an interplay between genetic predisposition and environmental exposures, resulting in immune-inflammatory pathway dysfunction. In individuals with a certain genetic history, the gut microbiota may be the missing piece in pathogenesis of PsA.
Recent evidence has emerged supporting the gut microbiomes pathogenic role in a different immune-mediated inflammatory disorders, such as diabetes mellitus, spondyloarthritis, and CV disease, the majority of which are well-known comorbidities of PsO and PsA.1820
So far, several studies on the intestinal microbiome of psoriatic patients have already been published, and four of them have demonstrated an imbalance between the two most prevalent intestinal flora, Firmicutes (F) and Bacteroidetes (B), with an increased F/B ratio.21 This kind of gut dysbiosis has been linked to diabetes, obesity, and CV disease.2224 Moreover, the presence of intestinal firmicutes was linked to a higher BMI and greater levels of the proatherogenic chemical trimethylamine-N-oxide, that raises the risk of CV events by enhancing endothelial dysfunction and interfering with cholesterol homeostasis at several levels.25,26
Furthermore, considering the comparable pathogenic aspects of obesity and psoriatic disease, both of which are characterized by similar cytokine profiles, an elevated F/B ratio might be another significant factor contributing to the pathogenesis of both of these diseases.27
Insulin resistance can be caused by a release of different cytokines, for example, tumor necrosis factor-, interleukin-17, or interleukin-6.28 Leptin is another adipokine that has a role in MetS and PsA pathogenesis.29 Increased BMI and IR have been linked to a high level of leptin.30 Endothelial dysfunction and the development of atherosclerotic plaques are caused by these inflammatory cytokines, which produce adhesion molecules and an elevated risk of CVS events in PsA.31
Metabolic syndrome has been discovered to be much more prevalent among people with PsA, PsO, and other inflammatory illnesses than in the overall population.3234 Raychaudhuri et al explored in their study, which included 105 patients with PsA that 58.1% of them diagnosed with MetS based on the AHA/NHLBI guidelines, and 61 of them satisfied a minimum of three out of five criteria for the diagnosis of the condition.35
Previous research by Haroon et al detected MetS in 44% of 283 PsA patients. They also discovered that around half of those diagnosed with MetS showed 4 MetS risk factors, with HTN (74%), increased circumference of the waist (56%), and hypertriglyceridemia (43.5%) appearing more frequently. Moreover, the study found that MetS was correlated with increased odds in patients with severe underlying disease (OR 4.47, p=0.001).7
An increasing amount of clinical research has established that PsO is frequently linked with MetS. Patients with more extensive PsO were shown to have an increased chance to have MetS than those with mild disease.3638 A large cohort study from Toronto investigated the MetS prevalence in PsA and compared them to PsO patients who did not have arthritis, finding a higher but not statistically significant prevalence of MetS in the former.39 Evidence from the literature and recent cross-sectional research indicates that those with PsA with apparent PsO had a higher frequency of MetS compared to PsA patients who did not have PsO (40.48% vs 13.16%, p = 0.006, respectively).40
The association between MetS and chronic inflammatory arthritis has also been studied. According to research and growing evidence, higher CV risk is not only attributable to an increase in conventional risk factors; it is also associated with factors involving disease and its therapy, such as chronically high pro-inflammatory cytokines and prolonged glucocorticoid therapy.41,42
A large previous study on the MetS frequency incorporated 930 individuals diagnosed with chronic inflammatory arthritis, with PsA having the highest prevalence (38%) followed by RA (20%) and ankylosing spondylitis (11%). Additionally, no significant correlation was discovered between MetS prevalence and disease longevity in the three inflammatory disorders.43 The frequency of MetS was also increasing in PsA patients than in the RA group in a large corona registry study (27% vs 19%; p = 0.02, respectively), even after demographic variables and BMI adjustments. Moreover, among the components of MetS, diabetes, hypertriglyceridemia, and high BMI were more frequent in PsA patients.33
Obesity is a critical element of MetS that can ultimately cause other conditions to develop, including IR, HTN, and increased lipids. It was described as a chronic slow inflammatory state connected to elevated pro-inflammatory cytokine production that follows a common pathway with psoriatic diseases and has a detrimental effect on disease prognosis.44
The connection between adiposity and PsA is difficult to comprehend. For instance, PsA might increase the risk of obesity by decreasing physical activity levels due to the functional and psychological restrictions of the disease. In contrast, obesity may have occurred before PsA developed, emphasizing that it may be a risk factor for the disease.45
Previous serial case studies indicated an increased likelihood of developing PsA in individuals with PsO whose BMI was higher when they were young adults, regardless of other risk factors or current BMI. Hence, patients who had high BMI at the age of 18 are threefold more likely to acquire PsA during PsO course than those with an average weight at 18. However, the study did have several significant limitations, including the way PsA cases were defined, challenges in identifying a temporal connection between the examined factors, and insufficient verified data regarding how accurately patients could remember their BMI at age 18.46
Li et al conducted a 14-year prospective study that discovered a significant link between BMI and an increased incidence of PsA. Furthermore, they found an ascending positive relationship between weight changes started at the age of 18 and PsA risk. They also discovered an analogous relationship in individuals who acquired PsO during a study follow-up.45
Additionally, a large population study showed a link between obesity and an increased chance of acquiring PsA in both PsO patients and the general population, regardless of other characteristics such as gender or age.47
Insulin resistance is a significant cardiometabolic risk for CVS disease, which causes considerable morbidity and death in individuals with inflammatory arthritis. It is uncertain whether IR is a disease-specific feature or linked to high disease activity phases. Inflammatory cytokines, including TNF, IL-6, and IL1, which have frequent involvement in PSA pathophysiology, have been linked to IR in the liver and adipose tissues, impaired insulin action in human skeletal muscle, and an increased risk of DM.48,49
An observational cohort study found a significant prevalence of IR (16%) among patients with PsA. Additionally, multiple regression analysis was conducted, the results of which indicated a significant relationship between IR and increased severity of underlying PsA disease, elevated BMI, and late-developing PsO.50 Furthermore, Eder et al discovered that diabetes mellitus was 43% more common in the PsA group than the total population. Notably, the severity of underlying psoriatic disease was identified as an important factor for developing diabetes across 11,006 overall person-years of follow-up.51
Additionally, Diabetes was shown to be more frequent in PsA patients than in sex- and age-matched persons without the disease (72%, HR 1.72) in a large population-based cohort study. Interestingly, when controlling for BMI, alcohol consumption, smoking, initial glucocorticoid utilization, and co-morbidities, the relationship was considerably decreased but remained significant (33%, HR 1.33) in PsA patients.52 As a result, the presence of inflammatory mediators cannot be entirely blamed for the development of diabetes; nevertheless, other variables, such as overweight and lifestyle habits, may also play an important role.
Furthermore, after controlling for atherosclerosis risk factors in individuals with PsA vs RA or ankylosing spondylitis, Mok et al discovered that PsA patients had more significant impairment in glucose tolerance (OR 2.58, P.001) compared to RA or ankylosing spondylitis patients.43
Hypertension is another essential component of MetS that is linked with an elevated risk of developing CVS disease. Studies indicated that HTN prevalence among PsA patients ranges from 25% to 49%.43,53,54 Furthermore, a large population study reported an increase in the frequency of HTN among those with PsA than in the general population (45.6% vs 35.8%, P < 0.0001 respectively).55 Moreover, individuals with PsA had a higher frequency of HTN than patients having only PsO (29% vs 18%, OR 1.7).56 Similarly, a study of a large cohort from the University of Toronto found also an increase in the HTN frequency among those with PsA in comparison to PsO patients with no arthritis (adjusted OR 2.17), even after controlling for known CVS traditional factors, medication history, as well as PsO duration and severity.32
In a large meta-analysis, the odds ratio of HTN was higher in individuals whose PsO was severe (OR 1.13) than those whose PsO was milder (OR1.09). Therefore, this finding emphasizes the significant contribution of inflammation-promoting arterial stiffness, which is linked to elevated hazard of CV events.57
Hypertension prevalence studies in patients diagnosed with different kinds of arthritis revealed a greater prevalence and incidence of HTN in PsA. A higher frequency (19.9% vs 18.6%) and incidence was reported in patients who had PsA than those with RA. Moreover, there was also an increased incidence of HTN among PsA patients in comparison to controls (HR 1.37) than among individuals with RA compared to controls (HR 1.16).11
Dyslipidemia is well known as an independent cardiometabolic risk for CV disease.58 The relationship between dyslipidemia and PsA has been controversial and inconsistent in previous studies. One explanation for this might be that various definitions of dyslipidemia are used throughout the research, making it impossible to compare data concerning the relative prevalence. Furthermore, it has yet to be confirmed if dyslipidemia considered as a distinct cardiometabolic risk factor for CVD in PsA beyond obesity.
According to the findings of a large PsA cohort study conducted in the Middle East, participants with PsA had a greater prevalence of hyperlipidemia than the total population (OR 1.5, P.0001).55 In addition, Kimhi et al discovered a rise in the prevalence of hypertriglyceridemia, hypercholesterolemia, and low-density lipoprotein (LDL) among PsA patients in their study (p < 0.005, p < 0.0001, and p < 0.0001, respectively).53 Based on data from a previous study on PsA, hypercholesterolemia and hypertriglyceridemia were linked with subclinical atherosclerosis.42
In large HUNT research, hypertriglyceridemia was more frequent in PsA groups when compared to controls. However, it was not statistically relevant after controlling for BMI. Other lipid values were comparable in both groups.59 In contrast, another study indicated that PsA patients had reduced total and LDL cholesterol levels but increased high-density lipoprotein (HDL) cholesterol, apolipoprotein A1 (Apo A1), and Apo B levels in PsA patients than in controls. Moreover, after controlling for BMI and hsCRP, the Apo B/Apo A1 ratio was considerably more elevated among the PsA groups than in the control groups. However, triglyceride levels were comparable across the two groups.54
Apo A1 is regarded to be a significant indicator of increased CV events with possible benefits above HDL cholesterol since it is responsible for transferring and functioning as the principal protein inhibiting atherogenesis in HDL particles.60
Apo B also carries all particles of lipoproteins that are potentially atherogenic. Although there is no consensus on the Apo B/Apo A1 ratio real use in previous studies, the cholesterol balance calculated based on the ratio has been demonstrated to be a superior measure compared with total lipids and lipoproteins levels.61 There is not yet a comprehensive understanding of the mechanisms behind these alterations in patients lipid levels with inflammatory diseases in the literature.
Additionally, multiple factors influence serum lipid levels, such as the patients diet and their usage of biologics or DMARDs. Apo B and triglyceride were elevated in those with PsA after commencing therapy with TNF inhibitor (TNFi), indicating a possible link between inflammation intensity and lipid abnormalities.62 Thus, because disease activity and anti-inflammatory medications can cause changes in lipid components, it is recommended that lipid profiling should ideally be performed when a patient is in stable condition or has entered remission.63
Metabolic syndrome raises the hazard of CV disease and atherosclerosis in PsA patients.6467 A persistent underlying inflammatory state and pathogenetic pathways are shared by MetS, atherosclerosis, and inflammatory arthropathies.68,69 A persistent low-grade inflammatory condition with imbalanced immuno-inflammatory pathways and fatty acid metabolism in the artery wall promotes endothelial dysfunction.70
An increase in the carotid artery intima-media thickness(c-IMT), a predictor of pre-atherosclerosis with greater sensitivity, has been seen in PsA. More crucially, a higher risk of inflammation has been linked to the production of atherosclerotic plaques in individuals with PsA over time.7173
Those with PsA disease had a greater likelihood of atherosclerosis, endothelial dysfunction, and c-IMT, both with or without MetS components.42,53 Atherosclerosis is also linked to the severity of both PsA and MetS components, including obesity, diabetes, and hypertension.53
In addition, those with PsA had a greater frequency of MetS and significantly higher c-IMT levels than people with PsO. Furthermore, when PsA and PsO patients with or without MetS were compared, it was shown that PsA individuals with the coexistence of MetS had the highest c-IMT levels.74
In PsA patients, it has been established that the existence of carotid atherosclerosis has a clear association with CV events, which is related to the duration of PsA as well as the inflammatory condition, and it materializes regardless of the existence of conventional CV risk factors.54,64 Thus, chronic inflammation is crucial for the advancement of atherosclerosis in PsA, which works in an independent and/or synergistic manner with traditional risk factors. Furthermore, Eder et al demonstrated that the c-IMT and carotid plaque area were better than the Framingham risk score in predicting an elevated hazard of acquiring CV events in a population of PsA, which adds credence to the hypothesis that CV morbidity is not purely mediated by standard CVD risk factors in such patients.75
Metabolic syndrome and PsA may have a shared predilection for low-grade inflammation; thus, it is crucial to find a suitable therapy that effectively decreases both clinical and subclinical chronic inflammation.
Data from previous studies support the role played by Methotrexate (MTX) in lowering inflammation in patients with chronic inflammatory conditions and consequently reducing CV risk. However, most of the data were derived from rheumatoid arthritis patients.76,77
An observational study that included patients diagnosed with inflammatory arthritis and confirmed to have endothelial dysfunction indicated that all patients experienced a marked improvement in endothelium function following six months of therapy with MTX monotherapy, MTX combined with TNFi, or only TNFi. Nevertheless, after six months of therapy, endothelial function improvement was more sustained and significant in the MTX- treated patient compared to those treated with combination therapy.78
A 12-week pilot study explored the safety of MTX in terms of glucose metabolism in PsA and MetS patients and reported no difference in glycated hemoglobin levels before and after therapy. Thus, MTX usage in this patient group is safe, with no hyperglycemic consequences. In fact, MTX seems to have a beneficial effect on glucose metabolism because commencing MTX therapy reduced glycated hemoglobin levels compared to the use of metformin.79
There is significant debate surrounding the efficacy of TNFi in MetS patients. Numerous studies have demonstrated that TNFi is less effective in obese people.80 In a large meta-analysis, a relationship was established between being an obese and inadequate response to treatment among PsA patients.80 Additionally, Obesity was linked to reduced chances of attenuating lower disease activity in PsA, highlighting the critical need of patients with PsA decreasing weight.81 In contrast, data from another study discovered that the coexistence of MetS did not influence the anti-inflammatory role of TNFi or the risk that minimal disease activity would be attained.82
In a cohort study in which the follow-up period was 24 months, Costa et al found that patients who received etanercept (ETN) and adalimumab treatment exhibited considerable improvements in metabolic syndrome components (circumference of the waist, triglycerides, HDL-C, and glucose) in comparison to MTX group.83 Furthermore, some few studies have revealed that patients managed with TNFi had a decreased chance of getting diabetes than those managed with disease-modifying antirheumatic medication (except hydroxychloroquine).84
The influence of TNFi on the cholesterol level in individuals with the underlying chronic rheumatic disease remains unclear; a comprehensive meta-analysis identified that the use of TNFi increased total cholesterol by 10% and HDL-C by 7% over six months. Moreover, LDL-C and ApoB levels have been shown to increase in small studies.85
Agca et al evaluated 118 PsA patients who had received ETN treatment for a period exceeding five years. They found that LDL-C, HDL-C, and triglyceride levels were all increased. Additionally, the ratio for ApoB to ApoAI was reduced, a finding that may have clinical implications given that an elevated ratio is linked to an increased likelihood of CVD events.86
Numerous large population-based studies have demonstrated that TNFi reduces the frequency of CV events in patient with psoriatic diseases. Armstrong et al found that PsO patients who used TNFi had a lower risk of MI than those who solely used topical therapy.87 In another study from Denmark, TNFi and MTX were linked with lower CV risk relative to topical medicines and phototherapy in PsO patients.88
In accordance with these findings, Wu and Poon found that patients with Psoriatic diseases who used TNFi had a reduced risk of new CV events than those who used other systemic medications or phototherapy.89
So, TNFi appears to have CV safety and maybe benefit, and it is favored over other treatments in patients at elevated CV risk, even though relatively little is known.
There is not enough evidence to indicate whether inhibiting IL-17 or IL12/23 improves metabolic syndrome in PsA patients. However, it has been demonstrated that being obese promotes the growth of T cells that produce IL-17 in fat and peripheral tissues. Furthermore, in patients with MetS, the IL-17R expression levels in the skeletal muscles and liver were linked to insulin resistance.56 Therefore, according to a large multi-center study, PsO patients who are obese have a lower response to secukinumab.90 However, another study found that obese PsA individuals may respond better to secukinumab than non-obese patients.91
Concern has been raised about the anti-IL-12/23 class of medications and the incidence of CV disease in PsA. However, a large, randomized trial on people with PsO found no association between ustekinumab usage and the risk of CV disease.92 More evidence on the CV safety of anti-IL-12/23 medications in psoriatic individuals is needed.
For therapy in PsA patients to be optimized, it is necessary to treat the skin and joint condition and identify and effectively manage co-morbidities.63 Much additional research must be done to fully grasp the complicated connection between PsA and MetS. The specific PsA variables linked to MetS must be identified, and it must be determined whether anti-inflammatory treatment approaches have any beneficial effect on MetS. Additionally, despite the existence of various DMARDs for the treatment of PsA, other factors, including the presence of co-morbidities, particularly MetS and CVS disease, must be taken into account when choosing suitable drugs for PsA management.93,94 The European Alliance of Associations for Rheumatology strongly encourages the adoption of lifestyle changes to mitigate CV risk factors.63 However, more investigation is needed to determine whether these strategies can augment or alter the effect of therapy on patients with MetS burden.
Psoriatic arthritis can present with various extra-articular symptoms that can manifest in isolation or together and that may take variable courses. Metabolic syndrome is intricately linked to systemic inflammation and has multiple inflammatory pathways in common with Psoriatic disease. The link between several components of MetS and psoriatic arthritis has been established, addressing the needs of screening, evaluating, and closely monitoring for co-morbidities. Therefore, rheumatologists should collaborate with other experts to detect MetS and its components as early as possible. In PsA patients with co-morbidities, the most appropriate therapy must be chosen for managing disease activity. Lifestyle changes, including smoking cessation and weight loss, are essential to decreasing CV events in PsA patients.
The author reports no conflicts of interest in this work.
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Original post:
Metabolic syndrome and its components in psoriatic arthritis | OARRR - Dove Medical Press
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