Secretory process: the role of age, autoimmunity and endocrinopathy
Xerostomia is a common occurrence in older people, impairing their quality of life. When salivary gland function goes below 50%, patients show oral mucosal dryness and consequent problems on speaking and eating. They present oral health impairment. Their quality of life is compromised too. The prevalence of xerostomia is reported to be approximately 30% in people over 65 years old. Drug-induced xerostomia is the most common cause of dry mouth in elderly, because many older adults are taking at least one medication that causes salivary dysfunction. Among the autoimmune disease that can cause xerostomia, Sjögren’s syndrome (SS) is the most representative one in elderly. Dryness of oral mucosa and eyes is the main symptom of the disease. The “Elderly onset primary Sjogren’s Syndrome” (EopSS) is a common disease in Caucasian population, with a global incidence of 3% but a geographic variability. Patients with SS are frequently misdiagnosed, and physicians treat each symptom individually, unaware of underlying systemic disease. The control of symptoms with substitution of saliva and tears is recommended; therapies with anti-CD20 and Interferon-α are useful in patients with residual glandular function and salivary flow. Among the endocrinopathies, diabetes mellitus (DM) is the most common cause of xerostomia in older patients. Hyposalivation increases in diabetic patients with low metabolic control, which can cause more severe side effects in relation to oral health. Xerostomia may be produced by changes in salivary composition (caused by diabetes complications such as neuropathy, angiopathy, and metabolic failure) instead of changes in salivary quantity. Treating diabetes itself, maintaining good glycaemic values, can allay xerostomia in those patients. Doctors and dentists have to be aware of the various oral manifestations of diabetes in order to make an early diagnosis and treatment, avoiding further complications.
The production of saliva is the main secretive process affected by age-related alterations of the immune system. While saliva plays a key role in preserving oral-pharyngeal health, the complaint of a dry mouth (i.e. xerostomia) and the objective finding of salivary dysfunction is a common occurrence in older individuals, producing transient and permanent oral and systemic problems that are as broad as impaired food and beverage intake, altered host defence, and oral communication; Untreated xerostomia significantly impairs the quality of life 1 due to its link to a number of conditions and downstream symptoms (Tab. I).
XEROSTOMIA IN GERIATRIC PATIENTS
Generally, the salivary function remains remarkably intact in healthy older people who are not being treated for medical problems or receiving pharmacological therapy. Salivary constituents appear to be age-stable in the absence of major medical problems and medications. There is a general agreement that values below 45% of unstimulated fluid secretion could be used as a cut off to define salivary hypofunction 2, and that with a glandular fluid production decreased by about 50%, a person will begin to experience symptoms of oral dryness 3. The prevalence of xerostomia increases with age and is reported to be approximately 30% of the population aged 65 and older 4. Drug-induced xerostomia is the most common cause, because many older adults are taking at least one medication that causes salivary dysfunction 5. However, it is difficult to estimate the true prevalence of xerostomia in older adults taking medications. In addition, radiation therapy to the head and neck for the treatment of cancer causes permanent xerostomia and has a 100% prevalence rate 6. The latter should not be underestimated since 1.2% percent of all men and women will be diagnosed with oral cavity and pharynx cancer at some point during their lifetime, based to the 2016 SEER statistics ().
Numerous systemic diseases and their treatments (medications, head and neck radiation, chemotherapy) contribute significantly to salivary gland dysfunction in older people 4 (Tab. II). Among the other autoimmune diseases, like Sjögren’s syndrome (SS), scleroderma, sarcoidosis, lupus, graft versus host disease are common causes of xerostomia in elderly patients. It is important to note that the prevalence of xerostomia is nearly 100% among SS patients, an autoimmune exocrinopathy affecting between 1 and 4% of older adult populations 7.
There is a progressive impairment of the immune system associated with aging; specifically, there is a reduction in the naive lymphocytes pool, and an increase in the number of memory lymphocytes. Neutrophils show a slower reaction to chemotactic stimuli and reduced phagocytic competence. In this age group, the relatively preserved innate response generally overrides the more altered adaptive immune response, resulting in higher production of pro-inflammatory mediators. This concept suggested that aging might be potentially associated with a chronic, sterile, often subclinical, low-grade inflammation.
Antinuclear Antibodies (ANA) and other autoantibodies count often become higher with aging, without showing a precise pathologic meaning. Indeed, despite the augmented prevalence of autoantibodies in subjects over the age of 75, incidence of autoimmune pathology (e.g. Lupus) is less frequent than in other age groups 8.
SJÖGREN’S SYNDROME IN THE ELDERLY
The most interesting autoimmune disease for its role on secretory function in the elderly is the Sjogren syndrome (SS). In the elderly population, this disease may present a typical clinical pattern. SS belongs to a group of connective-tissue autoimmune diseases. Dryness of oral mucosa and eyes is the most common and most recognisable symptom of the disease. There are two forms of the disease: primary (pSS) and secondary Sjögren’s syndrome (sSS). pSS has precisely defined diagnostic classification criteria aiming to exclude disorders that might imitate pSS, such as active hepatitis C, IgG4-dependent disease, or sarcoidosis, in the absence of other systemic connective tissue diseases. On the other hand, when symptoms of SS coexist with another systemic connective tissue disease, a secondary SS diagnosis should be evaluated. sSS is often identified focusing on the symptoms of dryness in the presence of other connective tissue disease, making the diagnosis of sSS quite subjective 9.
Given this issue, in 2019, Mavraganiet and Moutsopoulos proposed that the terms “primary” and “secondary” SS should be replaced by a more descriptive terminology: SS when the disease is expressed as an entity alone or “SS associated with systemic or organ-specific autoimmune diseases”, provided that, in all cases, the set of criteria for SS are fulfilled 10. Classification criteria 9 have been effective since 2016 (Tab. III). They constitute a consensus of the previous criteria and are the most objective of all proposed to date, due to exclusive use of objective methods, such as histopathological examination of labial salivary gland, Schirmer’s test, staining of the eye with Rose Bengal, or assessment of unstimulated salivary flow. Only the Anti-SS related antigen (SS-A/Ro) levels and minor salivary gland biopsy play a primary role in the diagnostic process, while Schirmer’s test, ocular Staining Score, unstimulated total salivary excretion, van Bijsterveld’s Score have a secondary role.
Epithelial damage, autoantibodies production and activation of innate and adaptive immune response are crucial events into pSS pathogenesis. There is an infiltration of the glandular tissue with predominantly CD4+ T lymphocytes, B lymphocytes and dendritic cells by epithelial cell proliferation and apoptosis. B-Lymphocytes are of key importance in producing auto-antibodies like ANA, ENA and SS-A/Ro – SSA/La, which appear later in the disease presentation 12. Autoimmunity can be favoured by antigenic mimicry (autoantibodies similar to hetero-antibodies, like EBV-antibodies) 13. The “Elderly onset primary Sjogren’s Syndrome” (EopSS) is a common disease in caucasian population, strongly predominant in female (9:1) and has a global incidence of 3%, varying by geographic areas and diagnostic capabilities 14. An Italian cohort-study evidenced an overall incidence of 6% 15. In our clinic we observed that about 10% of the suspected SS patients undergoing salivar glands biopsy for diagnosis are over 65 years old, with a confirmation of such diagnosis in about 50% of the cases. Overall, taking into account that EopSS could be mainly subclinical and benign, the epidemiological data could be underestimated 16. Older patients with symptoms suggestive of pSS show a number of typical age-related diagnostic challenges. We have already mentioned causes of Xerostomia which are strongly represented in elderly and it is important to keep an eye on these confounders during a differential diagnosis evaluation. Furthermore, comorbidities and concomitant medications increase iatrogenic Xerostomia risk.17 To complete the picture, age related alterations in salivary glands like acinar atrophy, increased fibrotic tissue with ductal dilation, make biopsy interpretation challenging. While acinar atrophy in elderly people could be a physiological aging expression instead of a chronic sialoadenitis, this may very well reduce the number of salivar glands eligible for biopsy.
Xerostomia and complications such as dysphagia with food bolus formation and translocation perturbed, dysgeusia with burning sensations and hypersensitivity of the oral mucosa, augmented the risk of developing dental caries, denture problems, speech problems, nocturnal mouth dryness, are all very frequent in SS patients. Speech and eating difficulties can impair social interactions and may cause some patients to reduce social activities. When salivary glands function goes below 50%, patients show mucosal dryness, cracked and atrophic lips, whiten oral mucosa, and a smooth and inflamed or fissured tongue with loss of some of the dorsal papillae. In patients with SS, the inability of the salivary system to restore oral pH and regulate bacterial populations often leads to a greater incidence of oral infections; as a matter of fact, compared to non-SS controls, one of the most commonly seen oral infections is candidiasis, which develops in 30-70% of the patients with SS 18-20. Angular cheilitis may occur more frequently in patients with SS 21. A visible enlargement of the major salivary glands can occur in patients with salivary obstructions secondary to salivary hypofunction and SS. Older adults have a higher risk to develop an acute parotitis after undergoing extended periods of dehydration and general anaesthesia 18.
SS treatment in elderly and younger patients shows no significant differences, since aims of therapy are common: control of glandular and extra-glandular manifestations, prevention of systemic organ damage, decrease morbidity and mortality, giving the best quality of life.
Preventive measures for ocular dryness include avoidance of exacerbating factors (low-humidity atmospheres and windy locations). Smoke and dust act as irritating factors for eyes and upper airways. Reading or computer use, if prolonged, should be avoided. Drugs that may worsen symptoms of dryness should not be used, if possible. Substitution of saliva and tears is recommended. Mints or sugar-free gums are recommended for patients with dry mouth. Gustatory and masticatory stimulatory techniques (e.g., use of candies that are free of sugar and sugar replacements) are easy to implement and are generally considered harmless. Frequent sips of water during the day and with meals prevent the dry mouth sensation. Muscarinic agonists like Pilocarpine and Cevimeline are effective in the treatment of ocular and oral dryness, if patients have residual functional gland tissue 22,23.
Oro-mucosal administration of Interferon-α (IFNα) has been tried, but the initial enthusiasm has been considerably reduced by the most recent studies 24.
In pSS patients with longer disease duration and lacking residual salivary gland function, anti-CD20 treatment seemed to be effective for systemic features, but no recovery of salivary ﬂow was observed in patients with no, or almost no, residual salivary ﬂow at baseline 25.
Recently, the European League Against Rheumatism (EULAR) developed two new patient-administrated questionnaires: the EULAR Sjogren’s Syndrome Patient Reported Index (or ESSPRI) to assess symptoms, detect disease activity and monitor the effectiveness of therapy, and a disease activity index to evaluate systemic complications, the EULAR SS Disease Activity Index (or ESSDAI) 26,27.
Finally, treatment in EopSS is challenging and can be complicated by comorbidities, an increased rate of adverse events linked to therapeutic agents, and polypharmacy. For these reasons, careful follow-up of the treatment is required.
Diagnosis of SS in the elderly is a new challenge for physicians. Given the increasing number of elderly people, patients with SS are frequently misdiagnosed and physicians treat each symptom individually, unaware of underlying systemic disease. Improving the awareness around SS is therefore of key importance, given the atypical presentation of autoimmune diseases in the elderly and the fact that early, accurate diagnosis of SS can prevent complications associated with the disease and improve the patient’s wellbeing.
DIABETES IN THE ELDERLY
Diabetes mellitus (DM) is a metabolic disorder characterized by the presence of chronic hyperglycemia associated in many cases with alterations to carbohydrate, protein, and lipid metabolism.
Diabetes is spreading much more year after year, people with diabetes live longer, and, as a result of these two facts, the prevalence of diabetes in the elderly is rising. Older people are nowadays a significant proportion of all patients with diabetes 28.
Diabetes mellitus relates to many different physical effects on patients; the most frequent oral manifestations related to DM are: dry mouth, tooth decay, periodontal disease and gingivitis, oral candidiasis, burning mouth syndrome (BMS), taste disorders, aspergillosis, oral lichen planus, geographic tongue and fissured tongue, delayed wound healing, and increased incidence of infection, salivary dysfunction, altered taste and other neurosensory disorders, impaired tooth eruption, and benign parotid hypertrophy 29.
Many studies have examined the prevalence of oral lesions and xerostomia in patients with diabetes; in one of them, the prevalence of dry mouth was a reported at 76.4% 31. The possibility of hyposalivation increases in diabetic patients with low metabolic control, which can cause more severe side effects in relation to oral health. Dry mouth sensation can be referred by people with normal salivary flow; in a study on elder people, the simultaneous existence of both xerostomia and hyposalivation was only 6%, while the prevalence of dry mouth sensation was approximately 20% 32.
Xerostomia may be produced by changes in salivary composition instead of changes in salivary quantity 33.
The change in salivary flow in diabetic patients is even caused by diabetes complications such as neuropathy, angiopathy and metabolic failure, decreasing the activity of the enzymes located in the salivary glands affecting its function.
In a study conducted by Chavez et al. 34, a tendency for salivary flow to decrease was observed when HbA1c values increased. Another study compared the salivary characteristics in 30 patients with diabetes, and the ones of 30 healthy subjects. Eighty per cent of DM patients presented with xerostomia, while only 10% of healthy subjects presented with it. Furthermore, urea and glucose levels in saliva were significantly higher in diabetics than healthy subjects. This suggests that DM can cause xerostomia and that there may be a significant correlation between the degree of xerostomia and glucose levels in saliva 35.
The term “quality of life” (QOL) is defined as the patients’ feeling of well-being related to various aspects of life. Oral health related quality of life (OHR-QoL) refers to individual feelings of the effects of oral health on the quality of personal life. Patients with diabetes mellitus, compared to healthy people, have a worse quality of life. A descriptive-analytical epidemiological study conducted in 2017 on 200 patients with type 2 diabetes mellitus, showed that xerostomia in diabetic patients has negative effects on oral health related quality of life. It also showed that diabetic control and patients’ oral problem improvement is effective in their quality of life promotion 36.
A study conducted in 2016 on 120 patients affected by DM type 2 (age ranged between 65 and 91 years) assessed salivary flow and its association with xerostomia. Of these, 111 (92.5%) presented a decrease in salivary flow while 59 (49.2%) reported moderate to severe xerostomia, so the association between low saliva production and moderate to severe xerostomia observed in this study was not significant (p = 0.489), showing that xerostomia is not associated with hyposalivation only. In both genders (insulin dependent and non-insulin dependent patients) severe reduction of salivary flow was the most prevalent condition, so there were no statistically significant differences between genders or diabetes types 38.
According to a review conducted in 2016 on studies on therapies of xerostomia, Pilocarpine is the best performing sialogogue drug for subjects with xerostomia due to radiation on head and neck cancer (always where there is some residual function of the parenchyma) or diseases such as SS. In older people, the most common cause of dry mouth is the use of medications with potential xerostomic effects, such as: anticholinergic, sympathomimetic, sedative-hypnotics, opiates, antihistamines and muscle relaxants 39; the review assessed that the use of malic acid is useful in patients with dry mouth caused by medication. Lubricating drugs of oral mucosa reduce the symptoms, although their effects are short over time 30.
Definitely, the success of different therapeutic strategies for the control of xerostomia, is still not strong enough to recommend a particular treatment, either pharmacological or not. According to a review performed in 2017, doctors and dentists need to be aware of the various oral manifestations of diabetes in order to make an early diagnosis 37. Some studies sought a bidirectional relationship in which periodontal diseases could hinder glycaemic control, which confirms the importance of oral care for patients with diabetes 40.
Figures and tables
|Decreased salivary function: oral and pharyngeal consequences|
|Dryness lips and mouth|
|Traumatic oral lesionsDental cariesOral-pharyngeal infections (candidiasis)Dysgeusia|
|Mastication problems and dysphagia|
|Poorly fitting denture|
|Causes of xerostomia in geriatric patients|
|Treatments||Anticholinergics (ACH)Tricyclic antidepressants (TCA)SedativesAntihistaminesAntihypertensivesAnti-Parkinsonian drugsAntiseizure drugsSkeletal muscle relaxantsCytotoxic agentsHead and neck radiotherapy|
|Oral pathology||ParotitisSialolithiasisSalivary obstruction|
|Systemic conditions||Sjogren’s syndromeSclerodermaLupusSarcoidosisGvHDDiabete mellitusHIV/AIDSMumpsAlzheimer’s diseaseDehydratation|
|Classification criteria for SS||Score|
|Schirmer test < 5mm/5min in at least one eye||1|
|Ocular Staining Score ≥ 5 (or van Bijsterveld’s Score ≥ 4) in at least one eye||1|
|Unstimulated total salivary excretion < 0.1 ml/min||1|
|Labial salivary gland biopsy showing focal lymphocytic sialadenitis and focus score ≥ ¼ mm2||3|
|Functional alterations in:|
|Increased susceptibility to the occurrence of:|
|oral and oropharyngeal infections|
|dental plaque formation|
|absence of saliva on the floor of the mouth|
|pale and cracked oral mucosa|
|filiform papilla atrophied and erythematous mucosa on the back of the tongue|
|dry eyes, skin, nose, throat|
|difficulty to wear dental prosthesis|
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