Home About us Editorial board Ahead of print Current issue Search Archives Submit article Instructions Subscribe Contact Us Login 
An Official Publication of the Indian Association of Oral and Maxillofacial Pathologists


 
  Table of Contents    
ORIGINAL ARTICLE  
Year : 2012  |  Volume : 16  |  Issue : 1  |  Page : 49-53
 

Determination of levels of salivary IgA subclasses in patients with minor recurrent aphthous ulcer


1 Department of Oral Pathology and Microbiology, Swami Devi Dyal Hospital and Dental College, Barwala, Haryana, India
2 Department of Oral Pathology and Microbiology, KLE Institute of Dental Sciences, Belgaum, India

Date of Web Publication17-Feb-2012

Correspondence Address:
Ramandeep Saluja
House No. 1638, Sector 64, Mohali
India
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0973-029X.92973

Rights and Permissions

 

   Abstract 

Context: Recurrent Aphthous Ulcer (RAU) is an inflammatory disease characterized by recurrent, painful oral ulcers. It is of multifactorial etiology. Salivary immunoglobulins have important role in the protection of mucosal surfaces. Aim: The aim of this study was to determine salivary immunoglobulin A1 (IgA1) and IgA2 in acute and remission phases of the disease. Materials and Methods: Thirty clinically confirmed cases of RAU and 30 age-and sex-matched controls were included in the study. After detailed case history and thorough clinical examination, 2 mL of saliva was collected in both acute and remission phases of the disease. The obtained saliva samples were subjected to quantification of IgA1 and IgA2 levels using RID kit. Results: The mean IgA2 level was significantly higher (P<.001) in both acute and remission phase of the study group. The mean IgA1 level also showed a significant increase in the acute phase compared to remission as well as controls (P<.05). Females exhibited a higher level in acute phase for IgA1 and in both phases for IgA2 (P<.05). Conclusion: The results associated with clinical observations suggest that acute phase is characterized with increase in IgA2 that might reflect increased immune response as a possible result of the microbial stimulation seen in the acute phase in comparison to the remission period. IgA plays an important role in the pathogenesis of RAU and it can be used as a parameter to assess the mucosal immune status


Keywords: Radial immunodiffusion, recurrent aphthous stomatitis, recurrent aphthous ulcer, salivary IgA subclasses, secretory IgA


How to cite this article:
Saluja R, Kale A, Hallikerimath S. Determination of levels of salivary IgA subclasses in patients with minor recurrent aphthous ulcer. J Oral Maxillofac Pathol 2012;16:49-53

How to cite this URL:
Saluja R, Kale A, Hallikerimath S. Determination of levels of salivary IgA subclasses in patients with minor recurrent aphthous ulcer. J Oral Maxillofac Pathol [serial online] 2012 [cited 2019 Aug 22];16:49-53. Available from: http://www.jomfp.in/text.asp?2012/16/1/49/92973



   Introduction Top


Recurrent aphthous ulcers (RAU) are the most common oral disease characterized by the repeated development of painful ulcers with unknown etiology and an incidence of up to 20% of the general population. A large variety of local, hematological, gastrointestinal, immunologic, genetic, nutritional, and medication reactions have been identified as the probable trigger factors of RAU. [1],[2]

IgA is the principal immunoglobulin isotype found in the external secretions including saliva and tears. Mucosal infections can induce specific salivary IgA immunological responses in the absence of detectable serum antibody; hence, IgA plays an important role in defence against infections. [3],[4] Two subclasses of IgA are found in humans; IgA1 and IgA2 based on the antigenic differences. [5],[6] Of the two subclasses IgA2 predominates in secretions like saliva. [7] There is a relatively high proportion of IgA2 in saliva because of the preferential transport of IgA2 produced in the distant tissues into saliva, and partly on the relatively increased number of IgA2 containing plasma cells in exocrine tissues. [8] The data regarding the levels of salivary IgA subclasses in RAU is still lacking. Most of the findings have been limited to the determination of total IgA either in serum or saliva. In the light of these factors this study was undertaken to investigate the possible alterations in salivary IgA1 and IgA2 in patients with recurrent aphthous ulcerations.


   Materials and Methods Top


Thirty clinically confirmed untreated (with steroids) cases of RAU and 30 age and sex matched controls were included in the study. After a detailed case history and thorough clinical examination, 2 mL of saliva was collected in both acute and remission phases of the disease. The obtained saliva samples were subjected to quantification of IgA1 and IgA2 levels using the RID kit.

Collection of saliva samples

The patients were asked to rinse their mouth thoroughly with water. Unstimulated whole saliva was collected in a sterile bottle by asking the patient to expectorate into it gradually over a period of 5-10 min. Approximately 1-2 mL of saliva was collected.

The obtained saliva samples were stored in deep freezer at-20°C until further test was carried out. The salivary IgA subclasses levels were estimated using the RID Kit (Human IgA subclass NLCombikit, the Binding site, UK).

Determination of the IgA subclasses

Appropriate volumes (10 μL for IgA1 and 10 μL for IgA2) of nondiluted saliva as well as of appropriately diluted calibrator and control sample were placed into agarose gel immunodiffusion plates containing the appropriate monospecific antibody. The plates were then tightly closed, resealed in their original pouches and placed in the moist chamber at 37°C in the incubator. After 96 h incubation, the precipitin ring diameters were measured using a tripartisan ruler. The antibody concentrations were read from the reference table enclosed, and expressed in mg/L of saliva. The ring diameters of the calibrator and control serum were always in the expected range, that is, their concentrations were always within 10% of the concentrations stated on the vial label.

Statistical analysis

The obtained salivary IgA1 and IgA2 levels in both study and control group were tabulated and statistical analysis was calculated using Mann-Whitney U test and students paired and unpaired t test was done. Using SPSS 11 version package A P value of < 0.05 was taken as significant.


   Results Top


The results of this study show that there was a statistically significant increase in the levels of IgA1 in an acute phase (P<0.001) as compared to remission phase and controls. Since IgA1 is susceptible to the proteases, it appears that its levels diminish in the remission phase.

There was a significant rise in the IgA2 levels in both acute and remission phases of the disease as compared to controls (P<0.001).

A genderwise comparison showed that females had higher levels of IgA1 in an acute phase (P<0.05). For IgA2, levels were increased both in acute and remission phases as compared to males (P<0.001). This may be attributed to hormonal related altered immune response.

[Table 1] and [Table 3] illustrate that the comparison between mean IgA1 levels in acute phase of the study group and controls was statistically significant (P<0.001).
Table 1: IgA1 levels in acute and remission phases in the study group

Click here to view


The comparison between mean IgA1 levels in remission phase of the study group and controls. The statistical difference was not significant (P>0.05).

[Table 2] and [Table 3] illustrate that the comparison between mean IgA2 levels in acute phase of the study group and controls was statistically significant (P<0.001).
Table 2: IgA2 levels in acute and remission phases in the study group

Click here to view
Table 3: IgA1 and IgA2 levels in controls

Click here to view


The comparison between mean IgA2 levels in remission phase of the study group and controls was statistically significant (P<0.001).


   Discussion Top


Recurrent aphthous ulceration or recurrent aphthous stomatitis (RAS) is an intriguing condition known to humanity since ages and was first described by Hippocrates (460-370 BC). He used the term "aphthai," a Greek word meaning small ulcer, to describe the disorders of the mouth. [9] Secretory IgA (s-IgA) help maintain the integrity of the oral surfaces by limiting microbial adherence to epithelial and tooth surfaces; by neutralizing enzymes, toxins, and virus; or by acting in synergy with other antibacterial factors such as lysozyme, lactoferrin, salivary peroxidase, and mucins. s-IgA may also prevent the penetration of antigens in the oral mucosa. It forms the first line of defence against pathogens in the oral cavity. [10] The literature search gives the evidence that levels of IgA in (serum/saliva) gets altered in oral mucosal diseases such as RAU. [8],[11],[12],[13] Most of the studies have been limited to the estimation of the whole salivary/serum IgA levels that have given contradictory results. Hence, this study was aimed to evaluate and compare salivary IgA1 and IgA2 levels in patients with minor RAU.

This study comprised of 60 subjects. Thirty subjects with RAU comprised the study group. Thirty age and sex matched healthy subjects were taken as controls. In our study 56.66% cases were females and 43.3% were males. The female predominance is consistent with other studies Jurge et al. [14] Minor RAU were the clinical type of aphthous ulcer included in this study. This is in accordance with study of Porter et al., who stated that minor aphthous stomatitis affects 80% of the population. [15] In this study, 41.7% (seven cases) were affected by RAU during the time of their menstruation. This finding substantiates the previous reports that menstruation may be a triggering factor for RAU. [16] This may be due to hormone induced alterations in the microbiota of oral mucosa leading to inflammation. It has also been related to the increased blood level of progesterone. [17] Out of 30 subjects, 15 cases, that is, 50% gave a positive history of stress. All 15 cases were college students preparing for summative examination. The high incidence of RAU seen in our study may be due to academic stress and anxiety faced by the students. Many studies have reported association of stress with RAU. [18],[19] 16.66% of the cases had the habit of smoking. Earlier studies have reported an inverse relation between smoking and occurrence of the disease. The nicotine in tobacco has been found to be beneficial in RAU and its effects may result from influences on nerve functions, although these may also exert direct anti-inflammatory effects. The mechanism by which nicotine protects against RAU is still unknown. [16]

Numerous studies have reported an increase in the s-IgA levels at the acute period and its reduction in the periods of remission. [13],[20],[21] These results suggest a strong correlation between s-IgA and the lesion mechanisms in RAU. Conversely many authors found no differences in the levels of salivary IgA in either acute or remission phases of RAU. [22],[23] The mean IgA1 and IgA2 levels in acute and remission phases showed a statistically significant increase (P<0.001) [Table 1]. [The comparison of mean IgA1 levels in the study group in the acute phase and controls [Graph 1] showed significantly raised levels while the IgA1 levels in the remission phase (684.8 mg/L) returned to the values not different from those in healthy controls (617.9 mg/L) [Table 1] and [Table 3]. This finding is in contrast to a study Sistig et al., 2002 in which only IgA2 levels were significantly raised. [8]



On comparison of acute and remission phases of aphthous patients with controls, it was found that the mean IgA2 levels remained high in both the phases [Table 2] and [Table 3] (P<0.001). [Graph 2] illustrates consistently raised IgA2 levels in both the phases, being highest in the acute phase (545.9 mg/L) compared to controls. The consistent rise in IgA2 levels in our study suggests that minute variations in IgA subclasses in RAU could not be elicited by simple determination of total IgA. The results of this study are compatible with the study of Sistig et al., [8] with one difference that in our study IgA2 levels were raised both in acute and remission phases. They suggested that these changes could be related to the chronic antigen stimulation because of higher concentration of the specific microorganism that could be involved in the pathogenesis of RAU.



Changes in the IgA1 and IgA2 concentrations in saliva may be the result of different antigen stimulation in the oral cavity that preferentially induces either IgA1 or IgA2 antibody production from plasma cells. Furthermore, the IgA subclass ratio may change during an active immune response (Crago et al., Brown and Mestecky. [24],[25] ) IgA1 is less resistant to bacterial proteases than IgA2. Killian. [26],[27] So the decrease seen in the IgA1 levels in the remission phase to the same as healthy controls could be due to its reduced sustainability because of its degradation by enzymes. A genderwise comparison in the levels of salivary IgA1 and IgA2 was made. The mean comparison of IgA1 levels in the acute phase between males and females showed statistically significant difference (P<0.05) with higher levels seen in females, that is, 1667.7 mg/L as compared to males 1121.15 mg/L. The mean IgA2 levels in both acute and remission phases in females showed a statistically significant increase (P<0.05) as compared to males. The reason for the increased levels in females as compared to males is not clear and further studies are required to confirm the present finding. The IgA subclasses levels in female patients did not show any association (P>0.05) with menstrual cycle. In a study on RAU, discrepant results were reported with regard to menstrual cycle and s-IgA. [13] Kazikawa et al. showed that salivary IgA levels were affected by menstruation. [28] In the current study, results are not conclusive as the sample size in the two categories of females is very small. Effect of microbiological load in the oral cavity has not been studied in this study. Some of the results are not conclusive as the study subgroups were small. Further studies taking large samples are required to establish the correlation beyond doubt.


   Conclusion Top


Immunoglobulin A is an important parameter to assess the status of mucosal immune system that can be measured by noninvasive methods and without patient discomfort. This study was an attempt to determine the IgA subclasses levels in acute and remission phases of the disease RAU using RID kit. Considering the limitations of the current study following conclusion can be drawn

  1. IgA subclass ratio may be changed during the active immune response, reflecting the generation of specific antibodies to various antigens of mucosal pathogens.
  2. Determination of salivary IgA using RID is a reliable, quick and a noninvasive means to assess the immune status in patients with RAU.
  3. IgA subclasses play an important role in the pathogenesis and defense mechanism of RAU.


 
   References Top

1.Lewkowicz N, Lewkowicz P, Kurnatowska A, Banasik M, Glowacka E, Cedzyñski M, et al . Innate immune system is implicated in recurrent aphthous ulcer pathogenesis. J Oral Pathol Med 2003;32:475-81.  Back to cited text no. 1
    
2.Vucicevic Boras V, Savage NW. Recurrent aphthous ulcerative disease: Presentation and management. Aust Den J 2007;52:10-5.  Back to cited text no. 2
    
3.Challacombe SJ, Tomasi TB Jr. Systemic tolerance and secretory immunity after oral immunization. J Exp Med 1980;152:1459-72.  Back to cited text no. 3
[PUBMED]  [FULLTEXT]  
4.Tappuni AR, Challacombe SJ. A comparision of salivary immunoglobulin A (IgA) and IgA subclass concentrations in predentate and dentate children and adults. Oral Microbiol Immunol 1994;9:142-5.  Back to cited text no. 4
[PUBMED]    
5.Childers NK, Greenleaf C, Li F, Dasnayake AP, Powell Wd, Michalek SM. Effect of age on immunoglobulin A subclass distribution in human parotid saliva. Oral Microbiol Immunol 2003;18:298-301.  Back to cited text no. 5
    
6.Conley ME, Koopman WJ. In vitro regulation of IgA subclass synthesis. I. Discordance between plasma cell production and antibody secretion. J Exp Med 1982;156:1615-21.  Back to cited text no. 6
    
7.Walker DM. Oral Mucosal immonology: An overview. Ann Acad Med Singapore 2004;33(4 Suppl):27-30.  Back to cited text no. 7
    
8.Sistig S, Vuciæeviæ-Boras V, Lukac J, Kusiæ Z. Salivary IgA and IgG subclasses in oral mucosal diseases. Oral Dis 2002;8:282-6.  Back to cited text no. 8
    
9.Ship JA. Recurrent aphthous stomatitis. An update. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1996;81:141-7  Back to cited text no. 9
    
10.Marcotte H, Lavoie MC. Oral microbial ecology and the role of salivary immunoglobulin A. Microbiol Mol Biol Rev 1998;62:71-109.  Back to cited text no. 10
[PUBMED]  [FULLTEXT]  
11.Brody HA, Silverman S Jr. Studies on recurrent oral aphthae. I. Clinical and laboratory comparisons. Oral Surg Oral Med Oral Pathol 1969;27:27-34.  Back to cited text no. 11
    
12.Ben-Aryeh H, Malberger E, Gutman D, Szargel R, Anavi Y. Salivary IgA and serum IgG and IgA in recurrent aphthous stomatitis. Oral Surg Oral Med Oral Pathol 1976;42:746-52.  Back to cited text no. 12
[PUBMED]    
13.Martinez Kde O, Mendes LL, Alves JB. Secretory A immunoglobulin, total proteins and salivary flow in Recurrent Aphthous Ulceration. Rev Bras Otorrinolaringol 2007;73:323-8.  Back to cited text no. 13
    
14.Jurge S, Kuffer R, Scully C, Porter SR. Mucosal disease series. Number VI. Recurrent aphthous stomatitis. Oral Dis 2006;12:1-21.  Back to cited text no. 14
    
15.Porter SR. Scully C, Pederson A. Recurrent aphthous stomatitis. Crit Rev Oral Biol Med 1998;9:306-21.  Back to cited text no. 15
    
16.Natah SS, Konttinen YT, Enattah NS, Ashammakhi, Sharkey KA, Hayrinen-Immonen R. Recurrent aphthous ulcers today: A review of the growing knowledge. Int J Oral Maxillofac Surg 2004;33:221-34.  Back to cited text no. 16
    
17.Shafer, Hine, Levy. Shafer's Textbook of Oral Pathology. 5 th ed. New Delhi, India: Elsevier, a division of Reed Elsevier India Private Limited; 2006.   Back to cited text no. 17
    
18.Ship II, Morris AL, Durocher RT, Burket WL. Recurrent aphthous ulceration in a professional school student population. Oral Surg Oral Med Oral Pathol 1960;13:1438-44  Back to cited text no. 18
    
19.Miller MF, Ship II. A retrospective study of the prevalence and incidence of recurrent aphthous ulcers in a professional population, 1958-1971. Oral Surg Oral Med Oral Pathol 1977;43:532-7.  Back to cited text no. 19
[PUBMED]    
20.Brozovic S, Vucicevic-Boras V, Bukovic D. Serum IgA, IgG, IgM and salivary IgA in recurrent aphthous ulceration. Coll Anthropol 2002;25:633-7.  Back to cited text no. 20
    
21.Pakfetrat A, Falaki F, Sankian M, Abbaszadeh H. Salivary Immunoglobulin A in Patients with Recurrent Aphthous Ulceration. J Appl Sci 2010;10:3117-21.  Back to cited text no. 21
    
22.Lehner T. Immunoglobilin estimation of blood and saliva in human recurrent oral aphthous ulceration. Arch Oral Biol 1969;14:351-64.  Back to cited text no. 22
[PUBMED]    
23.Bennet KR, Reade PC. Salivary immunoglobulin A levels in normal subjects, tobacco smokers, and patients with minor aphthous ulceration. Oral Surg Oral Med Oral Pathol 1982;53:461-5.  Back to cited text no. 23
[PUBMED]    
24.Crago SS, Kutteh WH, Moro I, Allansmith MR, Radl J, Haaijman JJ, et al. Distribution of IgA1, IgA2 and J chain-containing cells in human tissues. J Immunol 1984;132:16-8.  Back to cited text no. 24
[PUBMED]  [FULLTEXT]  
25.Brown TA, Mestecky J. Immunoglobulin A subclass distribution of naturally occurring antibodies to microbial antigens. Infect Immun 1985;49:459-62.  Back to cited text no. 25
[PUBMED]  [FULLTEXT]  
26.Kilian M, Reinholdt J, Lomholt H, Poulsen K, Frandsen EV. Biological significance of IgA1 proteases in bacterial colonization of pathogenesis: Critical evaluation of experimental evidence. APIMS 1996;104:321-38.  Back to cited text no. 26
    
27.Kilian M, Russel WM. Microbial evasion of IgA function. In: Mestecky J, Lamm ME, Strober W, Bienenstock J, McGhee JR, Mayer Leditors. Mucosal Immunolgy. 3 rd ed. Burmington UK: Elsevier Academic Press, 2005. p. 291-303.  Back to cited text no. 27
    
28.Kakizawa T, Noma H, Omori K. The evaluation of secretory IgA in human saliva. Bull Tokyo Dent Coll 1973;14:125-39.  Back to cited text no. 28
[PUBMED]    



 
 
    Tables

  [Table 1], [Table 2], [Table 3]


This article has been cited by
1 Elevated serum IgE in recurrent aphthous stomatitis and associations with disease characteristics
G Almoznino,A Zini,Y Mizrahi,DJ Aframian
Oral Diseases. 2014; 20(4): 386-394
[Pubmed] | [DOI]
2 Assessment the role of hematologic agent deficiencies in the etiology of recurrent aphthous stomatitis
Navabi, N. and Zarei, M.R. and Falsafi, F. and Sadeghi, B.
Journal of Babol University of Medical Sciences. 2013; 15(3): 88-95
[Pubmed]
3 Levels of salivary IgA in patients with minor recurrent aphthous stomatitis: A matched case-control study
Mohammad, R. and Halboub, E. and Mashlah, A. and Abou-Hamed, H.
Clinical Oral Investigations. 2013; 17(3): 975-980
[Pubmed]



 

Top
Print this article  Email this article
            

    

 
   Search
 
  
    Similar in PUBMED
    Search Pubmed for
    Search in Google Scholar for
  Related articles
    Article in PDF (686 KB)
    Citation Manager
    Access Statistics
    Reader Comments
    Email Alert *
    Add to My List *
* Registration required (free)  


    Abstract
   Introduction
    Materials and Me...
   Results
   Discussion
   Conclusion
    References
    Article Tables

 Article Access Statistics
    Viewed2102    
    Printed99    
    Emailed0    
    PDF Downloaded344    
    Comments [Add]    
    Cited by others 3    

Recommend this journal

Journal of Oral and Maxillofacial Pathology | Published by Wolters Kluwer - Medknow
Online since 15th Aug, 2007