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IJCRR - 8(19), October, 2016

Pages: 06-11

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ASSESSMENT OF SALIVARY ENZYMES-ALANINE AMINOPEPTIDASE(ALAP) AND DIPEPTIDYL PEPTIDASE IV (DPP IV) IN PATIENTS WITH CHRONIC PERIODONTITIS

Author: S. Rajasekar, V. Ramasubramanian, Sethupathi

Category: Healthcare

Abstract:Introduction: Alanine Aminopeptidase (ALAP) and dipeptidylpeptidase (DPP IV) are proteolytic enzymes released in the periodontal tissues from leukocytes, host cells and microorganisms. Both enzymes play an important role in collagen degradation and destruction of periodontal tissues. Therefore, detection of these enzymes might be useful in the diagnosis of periodontal disease.
Aim: To assess the salivary levels of ALAP and DPP IV in periodontally healthy and those with chronic Periodontitis and to correlate the enzyme levels with the severity of disease. A prospective comparative case control study was done on 60 systemically healthy patients in the age group of 25-55 and was divided into four groups with 15 patients in each as Periodontally healthy, Mild, Moderate and Severe Periodontitis. Methodology: Parameters like Plaque index, Gingival bleeding index, Probing pocket depth and clinical attachment loss were recorded at baseline and unstimulated whole saliva was collected from each patient and quantified for levels of ALAP and DPP IV using spectroscopic quantification method. Statistical analysis used ANOVA, Students t test and Pearson's correlation coefficient analysis was used.
Results: The salivary levels of ALAP and DPP IV were found to be higher in patients with Periodontitis than p healthy controls and were higher in severe (42.34\?8.96) (8.41\?1.44) and moderate group) (25.46\?6.79) (5.17\?1.31) than mild Periodontitis group) (15.83\?4.54) (3.69\?1.00) which was statistically significant.
Discussion and Conclusion: ALAP and DPP IV were higher in saliva of patients with chronic Periodontitis and positive correlation existed between the levels of these enzymes with the severity of Periodontitis.

Keywords: Alanine aminopeptidase (ALAP), Dipeptidylpeptidase IV (DPP IV), Saliva, Periodontitis

Full Text:

INTRODUCTION

Periodontitis is a poly microbial infectious disease affecting the supporting tissues of the teeth and is a major cause of tooth loss in adults. Periodontal destruction probably results from the action of various toxic products released from specific pathogenic sub gingival plaque bacteria as well as from the host responses elicited against bacteria and their products.1

 Bacterial virulence factors either result in direct degradation of host tissues or cause the release of biologic mediators from the host tissue cells that lead to host tissue destruction. Mediators produced as a part of the host response that contribute to tissue destruction include proteinases, cytokines and prostaglandins. Another important class of molecules in tissue destruction is the variety of enzymes produced by Periodontal microorganisms such as collagen degrading enzymes, elastase like enzymes, trypsin like proteases, amino peptidases and dipeptidylpeptidases.2

 Saliva is an important physiologic fluid that contains a highly complex mixture of substances. Over the last few years salivary diagnostics have received increasing attention. Saliva contains a variety of enzymes including esterases, proteinases, amino peptidases etc, synthesized and secreted by host cells and bacteria.3

Amino peptidase is a zinc dependent enzyme produced and secreted by glands of small intestine. It helps the enzymatic digestion of proteins.  Dipeptidyl peptidase IV (DPP IV) also known as adenine deaminase complexing protein 2 or CD 26 is a protein that, in humans, is encoded by the DPP IV gene. This enzyme is associated with immune regulation, signal transduction and apoptosis.4

 Alanine amino peptidase (ALAP) and Dipeptidyl peptidase IV (DPP IV) activity in whole saliva of patients with Periodontitis were found to be increased when compared with healthy individuals. Both these enzymes were found to be involved in degradation of collagen.5

Thus the present study was aimed to assess the levels of Alanine amino peptidase (ALAP) and Dipeptidyl peptidase IV (DPP IV) enzymes in saliva of Periodontally healthy subjects and in patients with chronic Periodontitis and also to correlate the level of these enzymes with the severity of Periodontal disease.

MATERIALS AND METHODS

This study was conducted in the Department of Periodontics, Rajah Muthiah Dental College & Hospital, Annamalai University. Tamil Nadu, India from July 2011 to March 2012. The study was approved by Institutional human ethical committee on 19-07-2011 and a written informed consent was obtained from all subjects participated in the study.

Sample size determination

Sample size was determined by power analysis procedure for ANOVA test based on pilot study done 3 months before in which mean and SD for all clinical and biochemical parameters were calculated and accordingly the required sample size for each group was 15

 A total of 60 systemically healthy subjects aged 25-55 were selected from the outpatient Department  and divided in to four groups as ; Group 1 (Periodontally healthy) , Group 2 (Generalized chronic mild Periodontitis) , Group 3 (Generalized chronic moderate Periodontitis) and Group 4 (Generalized chronic severe Periodontitis) with 15 patients in each group. The following were the inclusion criteria for enrolment of study subjects.6

Group 1 ; Healthy Periodontium, absence of bleeding on probing, pockets and attachment loss.

Group 2;  More than 30 % of sites with BoP , pockets ≥4 mm / CAL 1-2 mm.

Group 3 ; More than 30% of sites with BoP , pockets ≥ 4mm / CAL 3-4 mm.

Group 4 ; More than 30% of sites with BoP , pockets ≥ 5mm / CAL ≥ 5 mm.

Patients with known systemic diseases, smokers, pregnant and lactating women, those who were administered any systemic antibiotics, anti-inflammatory drugs or steroids in the preceding 3 months, and any form of periodontal therapy within the preceding 6 months were excluded from the study.

A special proforma was prepared for each subject and clinical parameters like plaque index7 , Gingival bleeding index8, Probing pocket depth and Clinical attachment loss were recorded by a single examiner (SR). On the subsequent day un stimulated whole saliva was collected between 9 and 10 am by the second examiner (RS).The subject selection bias was avoided by intra examiner calibration prior to study and the investigator who collected and analysed the saliva was masked about the Group of patients as a dummy code number was given to the samples.

The subjects were first asked to rinse their mouth with distilled water to remove the food debris and saliva was collected every 60 seconds to yield a total of 5 ml of each sample in a sterile plastic container. The samples were immediately transferred to the laboratory and were centrifuged at 3000 rpm for 15 minutes.

The supernatant was collected and stored at -70°c until enzymatic assay.

Chemical reagents used for detection of ALAP

  1. L-alanyl-b-napthylamide (1mmol)
  2. Phosphate buffer (10 mmol)
  3. Trichloro acetic acid (40% weight/volume)
  4. Sodium nitrate (0.1 % weight/volume)
  5. Ammonium sulfamate (0.5% weight/volume)
  6. N-(1-naphthyl)-ethylenediamine dihydrochloride  (0.05% weight/volume)

Calculation formula; standard absorbent value= {optical density value           optical density value} x 12.5x protein value

                                                                                 With sample                   -     without sample   

Chemical reagents used for detection of DPP IV

  1. Glycyl-prolyl-p-nitroanilide (3Mm)
  2. Sodium hydroxide (71 Mm)
  3. Acetate buffer

Calculation formula; optical density value (OD) •1.058•protein value

Chemical reagents were prepared manually for the detection of ALAP and DPP IV. ALAP was assessed by spectroscopic assay measuring the extent of hydrolysis of L-alanyl b-naphthylamide.9

DPP IV was assessed by spectroscopic quantification of glycyl-prolyl-p-nitroanilide hydrolysis.10 

Statistical analysis

The data obtained were subjected to statistical analysis with systat 12 software programme using ANOVA, Student t test and Pearson correlation co efficient analysis and the results were plotted in the form of tables.

RESULTS

The Result was as following

ANOVA test comparing age range of patients revealed no significant difference within the test groups (P-0.08)

(Table 1 A & 1B).

ANOVA test comparing the ALAP enzyme levels (table 2) revealed significant difference in the groups studied (P= 0.01). Student t test process was applied to compare the levels of ALAP enzymes within the groups and it was observed that the enzyme level in saliva was significantly higher in test group than the controls and within the test group the severe Periodontitis group (Group 4) exhibited highest values (42.34±8.96) followed by the moderate Periodontitis (Group 3) (25.46±6.79) and mild Periodontitis (Group 2 ) (15.83±4.54) and this was statistically significant (P- 0.01).

ANOVA test comparing the DPP IV enzyme levels (table 3) revealed significant difference in the groups studied (P=0.01). Student t test process was applied to compare the levels of DPP IV enzymes within the groups and it was observed that the enzyme level in saliva was significantly higher in test group than the controls and within the test group the severe Periodontitis group (Group 4) exhibited highest values (8.41±1.44) followed by moderate Periodontitis group (Group 3) (5.17±1.31) and mild Periodontitis group (Group 2) (3.69±1.00) and this was statistically significant (P- 0.01).

DISCUSSION

Chronic Periodontitis is an inflammatory condition affecting the tissues surrounding and supporting the teeth. As a result of inflammatory process, Proteolytic enzymes are released in the periodontal tissues from inflammatory cells. In addition, collagen degrading enzymes, trypsin like proteases, aminopeptidases and dipeptidylpeptidases may be produced by microorganisms. These proteolytic enzymes have an important role in periodontal destruction. Therefore, detection of these enzymes in saliva and GCF may help in periodontal diagnosis as well as to assess the progression of disease.

Our study consisted of 60 subjects with age ranging from 25-55 years and the patients were divided into four group’s namely Periodontally healthy controls (Group 1), Mild Periodontitis (Group 2), Moderate Periodontitis (Group 3) and Severe Periodontitis (Group 4) with 15 subjects in each group.

To the best of our knowledge this is the first study attempting to assess and compare ALAP and DPP IV enzyme levels in saliva of patients with mild, moderate and severe Periodontitis with respect to healthy controls.

 The subjects enrolled in this study were in the age group between 25-55 years and the mean age of patients in the test group were 36.53, 40.47, and 43.13 for mild, moderate and severe Periodontitis respectively. In the present study we categorized the test group patients as mild, moderate and severe based on the stage of their disease and to the best of our knowledge this was the first such design and this helps to assess the progression of the disease with respect to the level of enzymes. Also saliva was chosen as a medium to study the enzyme activity as it has a good potential as diagnostic marker and the collection involves non invasive procedure.

 ALAP is a proteolytic enzyme that plays a role in peptide hydrolysis and collagen degradation. Periodontitis is known to be a chronic inflammatory process that is characterized by an immune response that results in the release of cytokines which trigger PMNs and macrophages. Macrophages have been found to produce ALAP, while cytokines to stimulate ALAP activity. Thus several factors might be responsible for the high salivary expression of ALAP in Periodontitis.

The results of our study revealed significantly higher levels of ALAP enzyme in saliva of Periodontitis subjects when compared with healthy controls. This observation of our study was in accordance with Serenay Elgum et.al 20002.

 DPP IV is a peptidyl peptidase which seems to be involved in collagen degradation. Protease activity was found to be partly associated with inflammatory cells while DPP IV was localized in T lymphocytes and macrophages5.

In our study we observed significantly higher levels of DPP IV in saliva of Periodontitis subjects than healthy controls (p=0.01) and this was similar to the findings of Serenay Elugum et.al 20002. Who in their study found elevated levels of DPP IV enzyme in saliva of chronic Periodontitis patients as compared to periodontally healthy controls.

In studies done by Eley BM et al 11 and Abiko et al 12 the percentage of sites positive for P.gingivalis was positively correlated with DPP IV activity. However, we in our study did not correlate the enzyme activities with sites for P.gingivalis.

In the present study we observed that the ALAP and DPP IV enzyme levels were greater as the severity of the disease increased. The enzyme levels were significantly higher in severe Periodontitis followed by moderate Periodontitis when compared to the mild Periodontitis group (p =0.01).

Limitations

The limitation of our study was not correlating the enzyme level with the microbial load and this along with long term interventional study can be a future direction of Research.

CONCLUSION

The following conclusions were drawn from the present study;

  1. The salivary levels of enzymes Alanine amino peptidase (ALAP) and Dipeptidyl peptidase IV (DPP IV) were significantly higher in Periodontitis group as compared to healthy controls.
  2. In Periodontitis patients, there was a positive correlation between the salivary levels of enzymes ALAP and DPP IV and the severity of the disease.

The results of our study suggest that the ALAP and DPP IV enzyme levels in saliva could reflect the extent of disease progression and hence these enzymes can be very useful biomarkers in diagnosis and treatment planning. However, further longitudinal and interventional studies are needed to validate our findings.

KEY POINTS

Periodontitis is a chronic microbial and inflammatory disease. Various enzymes and cytokines are elevated in the tissues during the progression of the disease and these molecules are useful biomarkers of the disease. Saliva is a useful diagnostic tool for estimation of these biomarkers. In chronic inflammatory conditions like Periodontitis, proteolytic enzymes like ALAP and DPP IV are released from leukocytes and bacteria into the tissues and are responsible for collagen degradation. Estimation of these enzymes in saliva helps to assess the progression of the disease.

Acknowledgement

Authors acknowledge the immense help received from the scholars whose articles are cited and included in references of this manuscript. The authors are also grateful to authors/ editors/ publishers of all those articles, journals and books from where the literature for this article has been reviewed and discussed.

The authors also thank the Professors Dr. R. Mythili and Dr. S. Senthil Kumar for their guidance and moral support.

Source of funding- Nil

Conflicts of interest- Nil

 

References:

1 Nurdan ozmeric. Advances in periodontal disease markers. Clinica chimica Acta 2004; 343:1-16.

2 Serenay Elgum, Nurdan ozmeric, Selda Demirtas. Alanine aminopeptidase and Dipeptidyl peptidase IV in saliva ; a possible role in periodontal disease. Clinica Chimica Acta 2000;298:187

3 Edgar WM. Saliva, its secretion, composition and functions. British dental journal 1992;172:305

4 Wikipedia.com. Alanine aminopeptidases and Dipeptidyl peptidase IV.

5 Piyamas Aemaimanan, Nison sattayasai, Nawarat waracaswapati, Waranuch pitiphet, Saengsome prajaneh.  Alanine aminopeptidase and Dipeptidylpeptidase IV in saliva of chronic Periodontitis patients. J Periodontol 2009; 80:1809-1814.

6 Michael G Newman, Henry H Takei, Fermin A Carranza. Clinical Periodontology 9th edition;  WB Saunders company, The Curtis centre independence square west Philadelphia, PA 19106 2003  ISBN 0-7216-8331-2, An imprint of Elsevier Science.p121-149 ,p190-192.

7 Silness P, Loe H . Periodontal disease in pregnancy; correlation between oral hygiene and periodontal condition. Acta odontol scand 1964; 2: 121-135.

Ainamo J, Bay I. Problems and proposals for recording gingivitis and plaque. Int Dent J 1975; 25:229-235.

 Sidorowiez, Wen Cheng Hsia, Olgomaslej zownir, Behal FJ. Multiple molecular forms of human alanine aminopeptidase ; Immunohistochemical properties. Clinica Chimica Acta 1980; 107: 245-256.

Toshikaru Nagatsu, Masami Hino, Hiroshi Fuyamada, Taro Hayakawa, Yasuo Nakagawa. New chromogenic substrates for X-prolyl dipeptidyl aminopeptidase. Analytical Biochemistry 1976; 74:466-477

Eley BM, Cox SW. Cathepsin, elastase, trypsin and dipeptidylpeptidase in GCF ; Correlations with clinical parameters in untreated chronic Periodontitis patients. J Periodont Research 1992; 27: 62-69

Abiko Y, Hayakawa M, Murai S, Takiguchi H. Glycyl prolyl dipeptidyl aminopeptidase from Bacteroides gingivalis. J Dent Research 1985;64 :106-111

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A study by Raunak Das entitled "Study of Cardiovascular Dysfunctions in Interstitial Lung Diseas epatients by Correlating the Levels of Serum NT PRO BNP and Microalbuminuria (Biomarkers of Cardiovascular Dysfunction) with Echocardiographic, Bronchoscopic and HighResolution Computed Tomography Findings of These ILD Patients" is awarded Best Article of Vol 12 issue 13 
A Study by Kannamani Ramasamy et al. entitled "COVID-19 Situation at Chennai City – Forecasting for the Better Pandemic Management" is awarded best article for  Vol 12 issue 12
A Study by Muhammet Lutfi SELCUK and Fatma entitled "Distinction of Gray and White Matter for Some Histological Staining Methods in New Zealand Rabbit's Brain" is awarded best article for  Vol 12 issue 11
A Study by Anamul Haq et al. entitled "Etiology of Abnormal Uterine Bleeding in Adolescents – Emphasis Upon Polycystic Ovarian Syndrome" is awarded best article for  Vol 12 issue 10
A Study by entitled "Estimation of Reference Interval of Serum Progesterone During Three Trimesters of Normal Pregnancy in a Tertiary Care Hospital of Kolkata" is awarded best article for  Vol 12 issue 09
A Study by Ilona Gracie De Souza & Pavan Kumar G. entitled "Effect of Releasing Myofascial Chain in Patients with Patellofemoral Pain Syndrome - A Randomized Clinical Trial" is awarded best article for  Vol 12 issue 08
A Study by Virendra Atam et. al. entitled "Clinical Profile and Short - Term Mortality Predictors in Acute Stroke with Emphasis on Stress Hyperglycemia and THRIVE Score : An Observational Study" is awarded best article for  Vol 12 issue 07
A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award


A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award


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International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal

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