Abstract
Periodontitis is an inflammatory condition of supporting structures of teeth leading to attachment and bone loss. Cigarette smoking is the single most important and modifiable risk factor with 5 to 20-fold susceptibility for periodontal diseases. Reverse smoking is a peculiar habit of smoking where the lit end is kept inside the mouth, which is predominant in the northern coastal districts of Andhra Pradesh. Polyamines are biologically active amines involved in tissue regeneration and modulation of inflammation. The study aimed to evaluate polyamines and check their utility as a marker in detection of periodontitis among different groups. Total polyamine levels showed significant increase in reverse smokers with periodontitis when compared to the other groups. Qualitative analysis by thin layer chromatography showed three polyamine bands with varying intensity among the different groups. Mass spectrometric and NMR analyses of the three bands identified them as N1, N8-diacetyl spermidine, N-acetyl cadaverine and lysine. Most significantly elevated levels of lysine was observed in the smoker and reverse smoker periodontitis groups when compared to healthy and non-smoker periodontitis groups. The significantly elevated levels of N-acetyl cadaverine could be responsible for the more destruction of periodontium in the reverse smoker group. Antioxidant potential decreased significantly in different smoker periodontitis groups. The present study suggests that the quantitative analysis of salivary polyamines, lysine and N-acetyl cadaverine can aid as an easy noninvasive diagnostic method for assessing the periodontal status, especially in smokers.
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Introduction
Periodontal disorders are a group of chronic inflammatory condition of the tooth's supporting structures that results in attachment and bone loss, characterized by gingival inflammation, clinical attachment loss, periodontal pockets, gingival recession, alveolar bone loss, and eventually tooth loss (Cortelli et al. 2021). Periodontitis is a known risk factor for a variety of systemic diseases including diabetes, cardiac diseases, adverse pregnancy outcomes, metabolic syndrome, and rheumatoid arthritis, as well as a reduction in quality of life. As a result, identifying and diagnosing active periodontal disease is critical (D’Aiuto et al. 2008; De Smit et al. 2015; Sanz et al. 2020).
According to the World Health Organization (WHO), smoking is a threat to public health; it kills over eight million individuals each year, with nearly seven million deaths caused by direct smoking and approximately 1.2 million fatalities resulting from indirect exposure to smoke (who fact sheet 2022). The reverse practice of smoking is most common in the southern state of Andhra Pradesh Srikakulam district. In a residence-to-residence survey of 10,169 villagers with precancerous and cancerous oral conditions, 43.8% had been reverse smokers, with respect to female: male proportion of 1.7: 1 (Pindborg et al. 1971).
Cigarette smoking is a particularly important and well-established risk factor for periodontal disease growth and development (Haber et al. 1993; Kolte et al. 2012). Saliva is an intricate biological fluid made up of several distinct substances. Saliva is quickly gaining popularity as a diagnostic tool due to its benefits such as low cost of acquisition, availability of multiple sampling, ease of access, and avoidance of biopsies. Saliva biochemical analysis aids in predicting the risk of disease onset and degree of severity, monitoring the advancement of the disease, and assessing therapeutic efficacy in oral diseases (Giannobile et al. 2009). Diagnosing and identifying active periods of periodontal disease in patients at risk for tissue breakdown remains challenging for the clinician.
Polyamines (PAs) are low-molecular-weight aliphatic organic compounds that contain two or more amino groups and are found in significant amounts in almost all prokaryotic and eukaryotic cell types (Mustafavi et al. 2018). High intracellular PAs are known to be involved in many cellular processes, cell growth and proliferation, chromatin architecture modulation, stabilization of DNA and gene transcription as well as translation (Henderson Pozzi et al. 2009; Igarashi and Kashiwagi 2018). Several studies have shown that spermidine (Spd) and spermine (Spm) are involved in the prevention of bone loss in ovariectomy mice (Yamamoto et al. 2012). The involvement of PAs in cell migration was found to be through PA regulator AMD1 (Lim et al. 2018). Putrescine (Put) was discovered to play an important role in the periodontitis recovery period (Ishida et al. 1983). Lysine is an amino acid essential for integrity and dentally attached epithelial cell renewal. The bacteria deplete lysine, depriving host-attached cells of this essential amino acid nutrient, destroying the bacterial barrier, and causing inflammation and periodontitis. Salivary cadaverine and its derivative, N-acetyl cadavrine were higher in periodontal inflamed surface area which lead to enhanced gingival cervical fluid (GCF). This helped in slow destruction of the periodontium (Goldberg et al. 1994; Levine and Lohinai 2021;Sakanaka et al. 2017). As the periodontitis disease characteristics match with the multiple roles played by PAs, this study aimed to analyze and check for differences in PA levels among periodontally and systemically healthy, non-smokers, smokers, and reverse smokers with periodontitis.
Materials and methods
Study design
A total, of 80 individuals satisfying the inclusion and exclusion criteria from the outpatient department, GITAM Dental College & Hospital, Visakhapatnam, India, who consented to 13 ml of saliva sampling were included in the study. 20 systemically and periodontally healthy individuals, 20 non-smokers with periodontitis (P + NS), 20 smokers with periodontitis (P + S), 20 reverse smokers with periodontitis (P + RS), formed the study groups. Male/Female individuals aged 35–60 years, systemically and periodontally healthy individuals, non-smokers with periodontitis, smokers, and reverse smokers with periodontitis who have smoked ≥ 10 cigarettes per day for a minimum of 5 years were included in the study. Pregnant patients, with teeth showing trauma from occlusion, and patients with a history of drug intake for any systemic diseases were excluded from the study. The study was explained in local language and written informed consent was obtained from the participants. Ethical clearance of the study was taken from the GITAM Dental college and Hospital ethical committee, Vishakhapatnam (AP), India.
Case definition for periodontitis
A periodontitis case definition has been done according to Papapanou et al.(2018).
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Interdental clinical attachment loss (CAL) of > 2 mm, when the Cemento Enamel junction (CEJ) is detectable at two or more non-adjacent teeth.
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Buccal or oral CAL of at least 3 mm with pocketing > 3 mm.
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CAL cannot be associated with non-periodontal cases.
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Presence of Radiographic bone loss.
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Bleeding on probing in sites measuring > 4 mm.
Case definition for smokers and reverse smokers
Reverse smoking: The lit end of a hand-rolled tobacco leaf is kept in the mouth instead of the unburnt end.
Smoked ≥ 10 cigarettes per day for a minimum of 5 years (Michael et al. 2007).
Collection of salivary samples
Whole saliva samples (unstimulated) were collected in a sterile conical tube from each patient before clinical evaluation according to the established protocol by passive drool or spit technique after the mouth was rinsed with water (Bachtiar et al. 2021). Patients were instructed not to consume any type of food or use mouthwash for at least 1 h before saliva collection. Around 10 ml saliva was collected in 15 ml sterile plastic centrifuge tube provided by Tarson Pvt. Ltd. Collected saliva samples were centrifuged at 1500 rpm for 30 min at 4 °C and the resulting supernatant was separated in a 2 ml sterile centrifuge tube and stored at − 80 °C until further analysis. Quantification of PAs in saliva samples was analysed by derivatization, fluorescent labelling and estimation by fluorescence spectrophotometer.
Dansylation of PA
Total PAs was estimated according to a published protocol with some modifications (Lima et al. 2023). 100 µl of centrifuged saliva sample was used to estimate PA.
Preparation of PA standards
Spd, Spm, and Put standard PAs were prepared in distilled water at a concentration of 1 mg/ml. 20 µl of each PA standard was processed for dansyl chloride labelling. The labelled standard sample was used as marker and was separated in TLC along with the labelled PAs of saliva samples.
Estimation of PA
PA quantification was carried out following the extraction of dansylated PAs into the organic phase. A fluorescence spectrometer was used to measure PAs (Lima et al. 2023). Spd was used as a control, and the results were expressed as micrograms of PAs present in 200 µl of saliva. The 350 nm and 495 nm were used for excitation and emission respectively. A total of 20 samples (n = 20) were analyzed in each group.
TLC analysis
TLC was used to separate the extracted dansylated PAs from the saliva sample according to an earlier published protocol (Lima et al. 2023). A pre-coated silica gel TLC aluminium sheet (60 F254 Merck Millipore) (20 × 10 cm) was used. 150 µl of the extracted PAs were loaded onto the TLC plate at the loading point. A glass chromatographic tank (2515 cm) was used for linear ascending development and was pre-saturated for 30 min with ethyl acetate and n-hexane (3:4, v/v). The separated bands of dansylated PAs were observed, in gel documentation system using UV light and densitometric analyses were performed of the separated bands using Bio-Rad Image Lab 6.0.
Mass spectrometry analysis of PA
Distinct bands from the TLC plate were selected, pooled, and processed with a slight modification. PAs bands were cut from silica plates with a sharp blade and stored in 1.5 ml tubes. The PAs in the saliva sample were measured using a Waters Xevo G2-S Q-TOF mass spectrometer as described earlier (Lima et al. 2023).
NMR analysis of PA
The number and nature of hydrogen atoms and carbon atoms in PAs eluted from TLC were determined using 1H NMR and 13C NMR analysis. The 1H spectra of PAs were obtained using an NMR spectrometer set to 400 MHz, chloroform-d as the solvent, and tetramethylsilane (TMS) as the internal standard.
Analysis of antioxidant potential of the salivary samples
The antioxidant potential of the saliva samples of all the groups was analyzed using 1,1-diphenyl-2-picrylhydrazylc (DPPH), (Brand-Williams et al. 1995) and superoxide dismutase (SOD) (Beauchamp and Fridovich 1971) assays. 100 µl of saliva was used for each assay with twenty samples in each group (n = 20).
Statistical analysis
The one-way ANOVA was used to investigate differences in mean PA levels, the DPPH and SOD levels between groups. The TUKEY Post HOC test was used to identify means that are significantly different from one another; all tests were used depending on the nature of the distribution. To determine screening ability, the receiver operating characteristic curve (ROC) curve was drawn, and p < 0.005 was considered as statistically significant. Data were analysed using SPSS version 25.0 (IBM Corporation, USA).
Results
Quantitative changes in salivary PA levels
Total PA levels were estimated in the salivary samples collected from 80 individuals (20 each in P + RS, P + S, P + NS, and systemically and periodontally healthy individuals) who were in the age group of 35–60 years. In the present study, an inter-group comparison of PAs demonstrated a statistically significant difference (p < 0.05) with the highest levels of PAs in reverse smokers with periodontitis (23.43 ± 6.73) followed by smokers with periodontitis (22.78 ± 5.87), non-smokers with periodontitis(18.02 ± 5.65), and healthy individuals (17.04 ± 9.31). (Table S1, Fig. 1a).
The pairwise comparison demonstrated that the P + RS group had significantly (p < 0.05) higher levels of PAs compared to healthy individuals. PA levels were elevated in all the periodontitis groups compared to healthy individuals (Table S2, Table S3).
Receiver operating characteristic curve was utilized to calculate the screening ability of PAs for periodontitis. It was observed with reference to healthy individuals, PAs had a sensitivity of 52.9% and specificity of 58.8% in non-smokers with periodontitis, while in smokers with periodontitis the sensitivity was 58.8% and specificity was 52.9% and in reverse smokers with periodontitis the sensitivity was 64.7% and specificity was 52.9% for the detection of periodontitis (Fig. 1b, Table S4).
Qualitative differences in salivary PAs among different groups
Further, TLC analysis was carried out to understand the qualitative differences in salivary PAs extracted from different groups. TLC fractionation showed three distinct PA bands in all the groups (Fig. 2A). The bands corresponding to standard Spd and Spm were not observed in the healthy and different periodontitis groups. A band similar in mobility to Put was observed in healthy and periodontitis groups which was analyzed further. An inter-group comparison of of band 1, band 2 and 3 intensities showed statistically significant difference (p < 0.05 & n = 3) (Table S5).
The pairwise comparison of band 1 intensity revealed that it is highly significantly increased in P + NS group when compared to healthy group. P + S and P + RS groups did not show any significant change in intensity when compared to healthy group. Comparision of band 1 intensity between smoker and reverse-smoker groups also did not show any significant difference (Fig. 2b, Table S6A).
The pairwise comparison of band 2 intensity revealed that it is highly significantly increased in P + NS, P + S, and P + RS groups when compared to healthy group. Band 2 showed significant difference in intensity between P + NS and P + S, while P + NS and P + RS showed highly significant difference. Smoker and reverse-smoker groups did not show any significant difference (Fig. 2c, Table S6B).
The pairwise comparison of band 3 intensity revealed no significant difference between P + NS and healthy group. Significant increase was observed between P + S and healthy groups. Highly significant differnce was observed between P + RS and healthy group. Significant difference was observed between P + NS and P + S; P + NS and P + RS groups. Comparision of band 3 intensity between smoker and reverse-smoker groups did not show any significant difference (Fig. 2d, Table S6C).
The quantitative and qualitative analysis of PAs showed that the differences observed in intensities of band 2 and band 3 were found to be more significant when compared to the differences in band 1 intensities and total PA levels between healthy and different periodontitis groups.
Mass spectrometric and nuclear magnetic resonance (NMR) analysis of separated PA bands
The individual PA bands were identified using high-resolution mass spectrometry (HRMS). Derivatization of PAs with 234 g/mol dansyl chloride resulted in a significant increase in PAs mass. The presence of number of hydrogens and carbon was determined using 1H NMR and 13C NMR spectrometry.
Identification of band 1
The HRMS of dansylated band 1, yielded a peak at m/z 461[M-2] corresponding to the mass of 463 due N1, N8-diacetyl spermidine. The peak m/z at 155 corresponds to the fragment generated due to cleavage between methylene carbon adjacent to N8 acetylated Position [M-dansyl sulphur-CH2-NH-CH3CO], the peak m/z at 210 could be due to cleavage between N and sulphur of dansyl group with loss of oxygen from either of the acetyl group [M-2H-Dansyl sulfur-O] (Fig. 3a). The band's 1H NMR showed peaks at 1.3 ppm and 2–3, which were attributed to methylene protons between two nitrogens (NH-CH2-CH2-CH2-NH) and methylene protons adjacent to nitrogen (Fig. S1). Furthermore, the peak at 7–8 ppm corresponded to the aromatic hydrogens of dansyl chloride, while the peak at 4.0 ppm corresponded to protons attached to nitrogen. The band's 1H NMR showed peaks at 1.3 ppm and 2–3, which were attributed to methylene protons between two nitrogens (NH-CH2-CH2-CH2-NH) and methylene protons adjacent to nitrogen (Fig. S1). In addition, the peak at 7–8 ppm corresponded to the aromatic hydrogens of dansyl chloride, while the peak at 4.0 ppm corresponded to the protons attached to the nitrogen. The analysis of band 1 by 13C NMR showed peaks at 21.09, 24.87, 29.58, 30.96, 33.17, 36.03, and 39.45 ppm assigned for CH2. Peak observed at 155.68, 157.60, and 160.47 ppm were due to the aromatic carbon of dansyl chloride. Peak at 181.70 and 185.86 ppm showed the presence of two carbonyl group (C=O) (Fig. S2). The mass spectrum, 1 H NMR and 13C NMR of band 1 validated the band as N1, N8-diacetyl spermidine. Band 1 showed significant increase in N1, N8-diacetyl spermidine in P + RS and highly significant increase in P + NS.
Identification of band 2
Dansyl PA band 2 produced a single protonated molecular ion peak at m/z 611, which corresponded to N-acetyl cadaverine with two dansyl groups (M + H + 2 dansyl) (Fig. 3b). The fragment generated by the cleavage of the bond between the methyl group of dansyl cadaverine and the N-acetyl group corresponds to the peak m/z 315. The mass of N-acetyl cadaverine (M + H + dansyl + acetaldehyde) corresponded to the peak at m/z 377. The loss of one dansyl and acetyl group from N-acetyl cadaverine resulted in the peak at 337.2 [M + 2]. The presence of hydrogens and carbons in dansylated PA bands 2 was investigated and confirmed using 1H and 13C NMR (Fig. S3, Fig. S4). These findings show that band 2 is N-acetyl cadaverine.
Identification of band 3
Dansyl PA band 3 mass spectra revealed a molecular ion base peak at m/z 614 corresponding to the lysine mass with two dansyl groups (M + H + dansyl) (Fig. 3c). In addition to this, we observed significant peaks at m/z 251 and 317. The first cleavage at m/z 251 could be between dansyl sulfur and amine (M + H-dansyl-SO2), and the second cleavage at m/z 317 was due to cleavage at alpha carbon and dansyl amine with carboxylic group loss (M + H-dansyl-COOH). The presence and nature of hydrogens and carbons in dansylated PA bands 3 were investigated and confirmed using 1H NMR and 13 C NMR (Fig. S5, Fig.S6). Band 3 was identified as lysine.
Antioxidant potential
Significant increase in acetylated PAs; N1, N8-diacetylspermdine and N-acetyl cadaverine were shown earlier to be involved in increasing the oxidative stress in different cell types. Therefore, the level of oxidative stress was checked by DPPH and SOD assays in saliva of H, P + NS, P + S, P + RS groups. DPPH results showed the mean levels of % inhibition in the saliva of P + NS, P + S, and P + RS were decreased significantly compared to the healthy group. Intergroup comparison of % inhibition observed a statistically significant decrease in P + NS, P + S, and P + RS respectively compared to healthy group (p < 0.05) (Fig. 4a, Table. S7, Table S8). Similarly, the mean level of SOD activity in the saliva of P + NS, P + S, and P + RS were decreased significantly compared to the healthy group. Intergroup comparison showed a statistically significant decrease in P + NS, P + S, and P + RS respectively compared to healthy (p < 0.05) (Fig. 4b, Table. S9).
Receiver operating characteristic curve was used to calculate the screening ability of DPPH for periodontitis. It was observed with reference to healthy individuals, polyamines had a sensitivity of 93.3% and specificity of 13.3% in non-smokers with periodontitis, while in smokers with periodontitis the sensitivity was 93.3% and specificity was 67% and in reverse smokers with periodontitis the sensitivity was 46.7% and specificity was 53.3% for the detection of periodontitis (Fig. .4c, Table S10).
Discussion
Early diagnosis of periodontal disease is of paramount importance, especially in smokers. Active periodontal disease diagnosis and distinguishing patients at risk of periodontal disease is still a challenge. Salivary diagnostic tests can be employed as a chair-side diagnostic tool for early detection of disease(Giannobile et al. 2009). Smoking is an independent risk factor for periodontal disease. It affects the subgingival microflora, the human immune response, and increases the oxidative stress that leads to increased inflammation and destruction of the supporting tissues of the tooth (Michael et al. 2007). PAs are involved in inflammation, bone formation, and cell proliferation, all of which are important in periodontitis patients. The variation of PAs in periodontitis patients especially in smokers was not properly evaluated to date. Hence, this study aimed to analyse the diagnostic ability of salivary PAs levels in reverse smokers and smokers of periodontitis.
In the current study, an intergroup comparison of PAs revealed a statistically significant difference (p < 0.018), with reverse smokers periodontitis group having the highest levels of PAs, followed by smokers with periodontitis, non-smokers with periodontitis, and healthy individuals. PA levels in edematous and granulomatous tissue were elevated in chronic (adjuvant-induced arthritis) and sub-chronic inflammatory conditions in mice models (Chakradhar and Naik 2007). The increase in PAs observed during inflammation is most likely due to the activation of ornithine decarboxylase, a rate-limiting enzyme in PAs (Zhang et al. 2000). Depending on the definition of disease and smoking exposure, the risk of periodontal destruction for a smoker is 5 to 20-fold higher than for a non-smoker. In line with this, PAs were found to be significantly higher in reverse smokers with periodontitis in the current study, indicating higher levels of inflammation and oxidative stress.
Qualitative analysis of PAs showed three prominent bands which showed differences between the groups. Band 1, was identified as N1,N8-diacetylspermidine. It showed significant differences between healthy and non-smoker periodontitis group. It is involved in cell proliferation. The increased levels of it could be for the maintenance of cellular homeostasis of PA levels. Acetylated PAs contribute more to the oxidative stress through spermidine/spermine-N1-acetyltransferase and polyamine oxidase enzymes (Pegg et al. 2008). However, significant differences were not observed between healthy and smoker groups.
Band 2 was identified as N acetylcadaverine. Highly significant increase in its levels was observed in different periodontitis groups when compared to healthy group. It was found to be elevtated more in non-smoker groups when compared to smoker gorups. The increase in N acetylcadaverine is tightly associated as putative component of oral malodor and butyrate producing microbiome which leads to enhanced GCF substrate. This would slowly destroy the periodontium (Goldberg et al. 1994). Similar result was obtained in earlier studies associated with periodontitis which results in tooth loss (Andorfer et al. 2021; Kuboniwa et al. 2016).
Band 3 was identifed as lysine. Highly significant increase in its levels was observed in different periodontitis groups when compared to healthy group. Significant differences were found between non-smoker and smoker periodontitis groups. Elevated levels of lysine in the present study correlated with the study that showed. Lysine were significantly higher in the group of deep-pocket sites in comparison to the group of healthy sites and moderate-pocket sites (Ozeki et al. 2016). involvment of lysine in gingivitis and periodontitis (Levine and Lohinai 2021). The failure of GCF exudation in smokers results in the junctional epithelial attachment becoming deprived of amino acids including lysine.
The N1, N8-diacetyl spermidine, and N-acetyl cadaverine levels showed highly significant increase in periodontitis. The statistically significant decreased levels of DPPH and SOD in smokers with periodontitis when compared to other groups could have helped in tissue degradation as reported earlier with tobacco stress (Nosratabadi et al. 2012). The relationship between PAs and oxidative stress was reported to be bidirectional. PA synthesis is in turn induced by oxidative stress, as increase in expression of PA concentration-dependent genes are involved in protecting against ROS stress and repairing damage (Vrijsen et al. 2023). Nurcan Göktürk in 2022 has also reported increased oxidative stress caused an increase in PAs levels. The antioxidant potential between healthy and periodontitis groups was significant posing it as a better biomarker. However, DPPH assay did not show significant difference among non-smoker, smoker and reverse smoker periodontitis (Table S8). Therefore, we suspect that this cannot be used for checking the severity of the disease due to smoking. But, the levels of N acetyl cadaverine and lysine showed significant differences not only between healthy and periodontitis groups but also among different periodontitis groups. Hence, a combined assessment of N acetyl cadaverine and lysine will be a better biomarker for smoker periodontitis. The present study suggests that quantitative analysis of N-acetyl cadaverine and lysine could serve as potential biomarkers for individuals with periodontitis who smoke, including those who engage in reverse smoking.
Conclusion
In conclusion, PAs levels are elevated in saliva samples of smoker periodontitis groups indicating their active involvement in severity of the disease. The present study shows a relationship between different periodontitis groups and PA levels. Therefore, the study shows that instead of single polyamine as a biomarker, combined analyses of lysine, and N-acetyl cadaverine can be used as an easy tool for determination of levels of tissue degradation and diagnosis of smoker periodontitis patients.
The Fig. 5 represents overall conclusion of the manuscript.
Data availability
No datasets were generated or analysed during the current study.
Abbreviations
- PA:
-
Polyamine
- PCA:
-
Perchloric acid
- S + P:
-
Smoker and periodontitis
- P + NS:
-
Non-smoker and periodontitis
- P + RS:
-
Reverse smoker and periodontitis
- DNA:
-
Deoxyribonucleic acid
- ROC:
-
Receiver operating characteristic
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Acknowledgements
The authors wish to thank GITAM Deemed University for the GITAM Research Seed Grant (2022/0161) for partial support to AM and Central Research Laboratory, GITAM University for providing the Fluorescence Spectrophotometer; Dr. Shama for hel** in the collection of the sample, Anjali Jha helped in analysis of mass spectrum and NMR.
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HR carried out the experiment, analyzed the data, and drafted the original manuscript, SP diagnosed the patient and categorized the subject into a different group, and then BGL standardised the PA estimation from the saliva sample. YP did the statistical analysis and AM conceptualized the idea and supervised the experiments.
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Rashid, M.H., Yellarthi, S.P.K., Yellarthi, P.K. et al. Combined assessment of lysine and N-acetyl cadaverine levels assist as a potential biomarker of the smoker periodontitis. Amino Acids 56, 41 (2024). https://doi.org/10.1007/s00726-024-03396-4
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DOI: https://doi.org/10.1007/s00726-024-03396-4