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Zeng, W.;  Zhou, X.;  Yu, S.;  Liu, R.;  Quek, C.W.N.;  Yu, H.;  Tay, R.Y.K.;  Feng, Y.;  Lin, X. Treatment of Exocrine Gland Disease in pSS. Encyclopedia. Available online: https://encyclopedia.pub/entry/35620 (accessed on 17 May 2024).
Zeng W,  Zhou X,  Yu S,  Liu R,  Quek CWN,  Yu H, et al. Treatment of Exocrine Gland Disease in pSS. Encyclopedia. Available at: https://encyclopedia.pub/entry/35620. Accessed May 17, 2024.
Zeng, Weizhen, Xinyao Zhou, Sulan Yu, Ruihua Liu, Chrystie Wan Ning Quek, Haozhe Yu, Ryan Yong Kiat Tay, Yun Feng, Xiang Lin. "Treatment of Exocrine Gland Disease in pSS" Encyclopedia, https://encyclopedia.pub/entry/35620 (accessed May 17, 2024).
Zeng, W.,  Zhou, X.,  Yu, S.,  Liu, R.,  Quek, C.W.N.,  Yu, H.,  Tay, R.Y.K.,  Feng, Y., & Lin, X. (2022, November 22). Treatment of Exocrine Gland Disease in pSS. In Encyclopedia. https://encyclopedia.pub/entry/35620
Zeng, Weizhen, et al. "Treatment of Exocrine Gland Disease in pSS." Encyclopedia. Web. 22 November, 2022.
Treatment of Exocrine Gland Disease in pSS
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This entry is adapted from the peer-reviewed paper 10.3390/ijms232214135

Primary Sjögren’s syndrome (pSS) is a chronic, systemic autoimmune disease defined by exocrine gland hypofunction resulting in dry eyes and dry mouth.

primary Sjögren’s syndrome dryness fatigue

1. Introduction

Sjögren’s syndrome is a chronic systemic autoimmune disorder characterized by the destruction and diminished function of exocrine glands, mainly salivary and lacrimal glands, resulting in dry eyes and dry mouth [1]. In primary or secondary form, the disease is characterized by the gradual infiltration of lymphocytic cells and atrophy of glandular and ductal cells.
Primary Sjögren’s syndrome (pSS) has become increasingly common with a prevalence of 0.3%~3% among the public. Clinical manifestations of the disease are largely classified into exocrine gland and extraglandular disease features, which may be associated with widespread systemic complications involving the thyroid, lungs, kidneys, liver, and nervous system. A wide range of cognitive issues in pSS have also been reported, where persistent fatigue occurs in approximately 70% of pSS patients. The dryness and fatigue symptoms of pSS often impose detrimental effects on quality of life, as patients suffer from difficulties in eating, sleeping, and interacting with others [2].
Consensus on the cytokines and molecular entities involved in the initiation and maintenance of chronic immune activation in the disease remains difficult to elucidate [1][3]. Currently, the literature surrounding these therapies remains fragmented and no studies has been done to link the cytokines involved in pSS to the novel biological agents. Recent studies on novel drugs have shown promising results for the improvement of disease prognosis but unintended effects on the immune system, a variety of complications, and rising costs for patients [4]. In addition, ESSDAI (EULAR Sjögren’s syndrome disease activity index), which is a primary outcome measure in most trials, does not include certain common symptoms such as vaginal dryness (occurring in up to 64% of female patients) [5][6], fatigue (70% of patients) [7], and mental effects (over 30% of patients) [8].

2. Treatment of Exocrine Gland Disease in pSS

2.1. Dry Mouth (Xerostomia)

Salivary hypofunction leads to xerostomia in pSS patients. Dysphonia, dysphagia, stomatopyrosis (burning mouth), dysgeusia (altered taste), tooth erosion, and oral infections are common problems caused by xerostomia [9]. Current treatments include oral swabs, lip moisturizers, topical saliva substitutes, muscarinic agonists, scheduled use of ice water, electrostimulation, and acupuncture [10][11]. Though not life-threatening, dysphagia and awakening from sleep due to oral dryness are debilitating consequences of xerostomia [12], which beg the advancement of drug therapies beyond symptom relief [13].
Although type I interferon (IFN) is a pro-inflammatory cytokine, low-dose IFNα treatment was found to increase aquaporin-5 transcription and protein production in human parotid gland tissue, resulting in enhanced saliva and tear secretion. Administration of 150 IU of oral IFNα three times daily demonstrated the greatest potential in improving salivary output in one study [14]. However, multiple adverse effects were discovered, including a flu-like syndrome, chest pain and arthropathy, central nervous system depression, and myelosuppression [14][15]. Alternatively, 10–15 mg weekly dose of methotrexate resulted in increased salivary flow rate [16]. Eculizumab, a humanized mAb binding to complement protein C5, has been shown to ameliorate fatigue in myasthenia gravis and may be considered for the alleviation of fatigue in pSS [17].

2.2. Dry Eye

Dry-eye disease (DED) manifests as itching, grittiness, irritation, foreign body sensation, and blurry vision in pSS patients [18]. Anti-inflammatory therapies for pSS-DED include DMARDs (disease-modifying anti-rheumatic drugs) such as iguratimod and methotrexate, topical corticosteroids (1% methylprednisolone), antibiotics (azithromycin, doxycycline, and minocycline), and immunosuppressive agents (cyclosporine A and tacrolimus) [19]. The variety of systemic and topical drugs and the intricate titration of doses pose a challenge to developing treatment for dry-eye disease (DED). Mediators in driving the lacrimal pathology, and the latest drugs being trialed for the relief of pSS-DED are discussed.
Varieties of drugs targeting T cells have been considered in DED treatment. Abacept (NCT02067910, NCT04186871, NCT02915159) is a selective T cell costimulation inhibitor that may improving tear secretion in pSS by engaging CD28 and suppressing antigen-presenting cells. Baminercept, a lymphotoxin β receptor IgG fusion protein, inhibits differentiation and proliferation of T cells and decreases CXCL13 levels, which is associated with ectopic lymphocytic structures in the lacrimal and salivary glands of pSS patients [20]. However, the phase II trial failed to significantly improve either glandular or extraglandular pathology in pSS [21]. The combination of lulizumab (an anti-CD28 domain antibody antagonist) and BMS-986142 (a highly selective BTK inhibitor) is being trialed. Lastly, while hydroxychloroquine (HCQ) was recommended by the European League Against Rheumatism (EULAR) as an effective suppressor of effector T cells, it did not improve tear film break-up time and ocular surface disease index in a recent trial [22]. This was further supported by a meta-analysis, where the efficacy and efficiency of HCQ in relieving eye dryness was limited [23].
Other candidates for DED treatment are drugs targeting cysteine protease cathepsin S (CatS). CatS may play a crucial role in MHCII processing and T cell stimulation, as it was found to be elevated in the tears of pSS patients. RO5459072, a CatS inhibitor, caused a dose-dependent downregulation of CatS/MHCII-mediated effect and may be a potential target for treatment [24].
There are also emerging biological agents targeting Th1/Th17 cytokines and B cell activating factor (BAFF) pathways. DMARDs such as leflunomide and anti-TNF, which ameliorate dryness symptoms in rheumatoid arthritis (RA) patients, may also be considered in pSS patients [25][26]. Topical use is preferred due to the side effects of these systemic immunosuppressants. Finally, 0.005%/0.01% lacripep and 0.05% cyclosporine eyedrops have also exhibited promising efficacy in relieving symptoms in pSS [27].

2.3. Vaginal Dryness and Dyspareunia

Women with pSS may suffer from vulvovaginal dryness, vulvar pruritus, and dyspareunia, partially similar to that in postmenopausal women. Histopathological assessment of vaginal mucosa biopsies displayed subepithelial inflammation, with lymphocytic infiltrations of CD45+, CD3+, and B cells occurring more frequently in pSS patients. It has been postulated that this is induced by IFN-mediated CXCL10 and/or JAK-STAT pathways [6]. Lymphocytic infiltration resulting in decreased transudation of serous fluid into the vaginal vault has also been hypothesized. Clinical trials of interest are those on parsaclisib and abatacept. The results are highly anticipated as possible future therapies for vaginal symptoms in pSS.

2.4. Fatigue in pSS

Current trials often neglect the treatment of extraglandular symptoms such as fatigue, depression, and anxiety. Approximately 70% of pSS patients claim persistent fatigue [28][29]. Evidently, fatigue has significant effects on quality of life, rendering it as one of the key issues in pSS clinical management. Despite being the most common symptom in pSS, the immunology behind fatigue has yet to be established. Currently, factors involved in mechanisms causing fatigue in pSS include IL-1, IL-36α, and humoral autoimmunity.

2.4.1. IL-1

IL-1 is a pro-inflammatory cytokine that exists in two biologically active forms: IL-1α and IL-1β [30][31]. Pharmacological experiments have shown that systemic administration of IL-1β to rats and mice induced a reduction in exercise activity, less food and water intake, social withdrawal, increase in slow wave sleep, and cognitive changes in a dose- and time-dependent manner that parallels human fatigue [32]. Studies have found that increased levels of IL-1 receptor antagonist (IL-1Ra) in the cerebrospinal fluid of pSS patients was associated with greater fatigue [33]. This was further supported by a cohort study (n = 49) that showed a higher association with serum IL-1β and hypocretin-1. Interestingly, hypocretin-1, the main regulator of sleep and wakefulness, is possibly driven by the IL-6/tumor necrosis factor α (TNF-α) axis, thus causing fatigue in pSS [34].
Treatment of fatigue in pSS has been challenging; however, inspiration may be drawn from a randomized study in which canakinumab, a human anti-IL-1β monoclonal antibody, improved the Short-Form Vitality 36 score from 12.0 to 48.3 in patients with gout [35]. Thus, targeting IL-1 may be an option for relieving fatigue in pSS.

2.4.2. IL-36α

As mentioned, IL-36α plays a role in pSS mechanisms. Interestingly, compared with pSS patients who did not experience fatigue, the expression of IL-36α was up-regulated in patients with fatigue [36]. Although there was no overt evidence for the function of IL-36α in causing fatigue in pSS, this possibility should be considered.

2.4.3. Immunoglobulins

It is speculated that the fatigue in pSS patients may be related to humoral autoimmunity. One study showed that the Fatigue Scale 14 in a sub-healthy population negatively correlated with their serum immunoglobulin A (IgA) and IgG levels. This was further corroborated by a cross-sectional study that demonstrated a positive correlation between increased IgG levels and risk of pSS-related fatigue [37].

2.4.4. Other Mediators

Recent studies found that the intensity of fatigue based on the Profile of Fatigue Questionnaire was negatively correlated with several pro-inflammatory cytokines, including IFN-γ, TNF-α, lymphotoxin α, and CXCL10 [38][39]. Analysis by logistic regression model revealed that lower levels of IFN-γ and CXCL10 with increases in reported pain and depression were the most important predictors of fatigue [38]. This constitutes an argument against the role of inflammation in the pathogenesis of fatigue in pSS; more research is needed given its prevalence and pervasiveness.

2.4.5. Alternative Medicine

The future of pSS therapy should consist of a blend of Western and alternative medicine, tapping their synergistic potential while maintaining a balance to minimize the risk of drug–drug interactions. Total glucosides of paeony (TGP), derived from the herb root of the Paeonia lactiflora pall, was approved by the Food and Drug Administration of China to enter the market as a DMARD since 1998. A multi-center study found that TGP improved fatigue VAS scores [40]. The mechanisms are based on the balancing of Th1/Th2 cytokines and reduction of IFN-γ, interleukin-4 (IL-4), Fas, and FasL expression, as revealed on serological assessment [41]. Acupuncture therapy is a well-recognized approach by the public for relieving fatigue. A protocol for a trial was published in 2017 [42], and ongoing study of acupuncture treatment in pSS may provide evidence for it ameliorating fatigue.

2.4.6. Anti-Inflammatory and Immunosuppressive Treatment for Fatigue

The therapies targeting IL-1, IL-36α, and immunoglobulins for pSS-related fatigue and current treatments, efficacies, and adverse effects are as follows, mainly including hydroxychloroquine (HCQ), rituximab, and TNF-α inhibitors.
A retrospective study of sham-needle-free group in 1996 reported that about one-third of systemic lupus erythematosus (SLE) patients with SS treated with HCQ had an improvement in fatigue [43]. Based on this, HCQ has been considered for the treatment of fatigue symptoms in pSS. Although a randomized experiment completed in 2012 (NCT00632866) found that HCQ has limited efficacy in improving fatigue [44], the 2016 guidelines continue to support the use of HCQ in selected situations [45].
Rituximab is associated with better visual analogue scale (VAS) scores for fatigue in 17 pSS patients receiving 1000 mg rituximab for 6 months [46]. A larger trial (n = 120) had similar findings, where VAS scores for fatigue in patients treated with rituximab were also improved [47] due to the elimination of B cell-mediated immune response and immunoglobulin productions.
A pilot study reported that fatigue symptoms improved in pSS patients treated with infliximab as an inhibitor against TNF-α signaling [48]. A hypothesis from an in vitro study suggested that, apart from the blockage of circulating TNF-α molecules, infliximab also has the added function of inhibiting membrane-bound TNF-α. This may explain why infliximab-mediated interruption has a longer duration of action compared with etanercept, which does not improve fatigue because the receptor fusion protein detaches from membrane-bound TNF-α [49]. Similarly, there is a lack of evidence on whether the latest biological drugs, such as anakinra (NCT00683345) [50], abatacept (2009-015558-40) [51], belimumab [52], and epalizumab [53] could be applied for treating fatigue in patients with pSS.
Additionally, dehydroepiandrosterone (DHEA) has been proposed as a treatment for several autoimmune diseases. However, a trial suggested that there were no significant differences in fatigue between pSS patients treated with DHEA or placebo [54]. These findings were supported by another study (NCT00543166) that demonstrated that DHEA substitution treatment in DHEA-deficient and severely fatigued patients with pSS did not significantly improve fatigue compared to the placebo [55].

2.5. Depression and Anxiety in pSS

Psychological complications frequently disturb patients with fatigue and pain [56][57]. Depression and anxiety occurs in 36.9% and 33.8% of pSS patients in China [58]. In France, anxiety (pSS: 41.5%, non-pSS:39.5%) and depression (pSS: 28.3%, non-pSS: 26.7%) happen more frequently in pSS patients [59]. A study found that patients who experienced more pain, fatigue, worse oral hygiene, and swallowing disorders also had greater anxiety and depression. In female pSS patients, pain (β = 0.025, p = 0.028) and fatigue levels (β = 0.029, p = 0.004) were associated with anxiety, while pain (β = 0.022, p = 0.047), fatigue (β = 0.033, p = 0.001), and xeroderma scores (β = 0.030, p = 0.003) were strongly associated with depression [57]. Meanwhile, oral health (OR =  0.956, p < 0.05) and swallowing disorders (OR = 1.036, p < 0.05) were significantly associated with anxiety, while fatigue (OR = 0.587, p < 0.05) was positively correlated with depression in pSS [8][57].
To date, the underlying mechanisms of depression or anxiety in pSS remain unclear, although neurobiological factors are speculated. A recent hypothesis suggests that depression may be attributed to neuronal serotonergic and noradrenergic dysfunction, the change of dopamine and brain-derived neurotrophic factor (BDNF), and hyperactivity of hypothalamic–pituitary–adrenal (HPA) axis in the central nervous system. Additionally, gut microbe and amino acid metabolism and autoAbs against neuropeptides have also been considered to be involved in the pathological mechanisms of depression [60]. Early studies reported relatively higher serum autoAbs against α-melanocyte-stimulating hormone (MSH) in pSS patients compared with health controls. This was highly correlated with anxiety states [61], which may result from dysregulation of melanocortin system. A study found an association between humoral autoimmunity and cytokines with depression [62]. While these findings were similar to those in animal models, greater information is needed about anxiety and depression in humans.
Interestingly, BAFF transgenic mice were established to research the mechanisms of anxiety, supporting the notion that humoral autoimmunity may partially be responsible for brain inflammation, impaired neurogenesis (stress-related brain responses), and hippocampal plasticity, leading to pSS-related anxiety [63]. Notably, using the same model, further studies suggested that dietary supplementation with n-3 polyunsaturated fatty acids could inhibit hippocampal microglial activation and increase hippocampal progenitor cell proliferation and plasticity [64], thus validating the effect of humoral autoimmunity-mediated neuroinflammation on depression. Given the possible role of BAFF in depression, it is worthwhile to explore the BAFF-targeted drugs mentioned above.
Except for regular drug options like serotonin selective reuptake inhibitors (SSRIs) [65], compelling evidence has suggested that traditional Chinese medicine can relieve anxiety and depression in pSS [66], including the influence of BAFF production and endocrine hormone levels. Additionally, in a randomized-controlled trial (n = 45) (NCT02370225), aerobic exercise greatly improved life quality by relieving fatigue and depression, further supported by studies showing supervised walking as beneficial for female pSS patients [67]. Additionally, acupuncture (NCT02691377) and dehydroepiandrosterone (NCT00391924) were also shown to have favorable effects on depression and anxiety, though the mechanisms remain unclear. Thus, a combination of neuroinflammation resolution and aerobic exercise may be considered as alternative approaches for treating pSS patients with depression or anxiety.

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Subjects: Rheumatology
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Weizhen Zeng
,
Xinyao Zhou
,
Sulan Yu
,
Ruihua Liu
,
Chrystie Wan Ning Quek
,
Haozhe Yu
,
Ryan Yong Kiat Tay
,
Yun Feng
,
Xiang Lin
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Update Date: 22 Nov 2022
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