Journals / İnfeksiyon Dergisi / 2004 / Cilt: 18 - Sayı: 4

The value of Western blot test in the serologic diagnosis of Helicobacter pylori infections

Helicobacter pylori infeksiyonlarının serolojik tanısında Western blot yönteminin değeri

Pages
467–472
Publication Date
2022-10-17
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

In conclusion, the study supported the use of Western blot method in the determination of humoral immunity profiles against antigens of Hp and antibodies against cagA and vacA specific virulence factors.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:H. pylori (Hp) Western blot IgA and IgG tests were compared with conventional test methods for detecting Hp infections in patients with peptic ulcer and gastroduodenitis.
📊
Key Findings & Data:Also antibodies against various Hp antigens including the major Hp factors like cagA and vacA were investigated and the relationship of these factors with endoscopic diagnosis was determined. 20.6% and 74B% of 63 patients who had upper gastrointestinal endoscopy, were classified as "peptic ulcer" and "gastritis and gastroduodenitis", respectively.
💡
Conclusion & Impact:In conclusion, the study supported the use of Western blot method in the determination of humoral immunity profiles against antigens of Hp and antibodies against cagA and vacA specific virulence factors.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

In this study,. H. pylori (Hp) Western blot IgA and IgG tests were compared with conventional test methods for detecting Hp infections in patients with peptic ulcer and gastroduodenitis. Also antibodies against various Hp antigens including the major Hp factors like cagA and vacA were investigated and the relationship of these factors with endoscopic diagnosis was determined. 20.6% and 74B% of 63 patients who had upper gastrointestinal endoscopy, were classified as "peptic ulcer" and "gastritis and gastroduodenitis", respectively. The presence of Hp was investigated with urease test in tissue, histopathology and culture from thebiopsy specimens taken from the patients. 44 (69.8%) and 19 (30.2%) of the 63 patients were found as Hp (+) and Hp (-), respectively. The results of Western blot IgG and IgA tests were compared with the Hp (+) and Hp (-) patient groups. The sensitivity, specificity, PPV (Positive Predictive Value) and NPV (Negative Predictive Value) of Western blot IgG and IgA were found 92.8%, 77.7%, 73.5% 57.1% and 31.7%, 31.2%, 72.2%, 28.2%, respectively. Antibodies were detected as 83%, 79.2%, 52.8% against cagA, ureB and ureA sub-units of Hp in Western blot IgG (+) patients, respectively. Antibodies against-the same antigens were detected as 83.3%, 77.7%, 27.7% in Western blot IgA (+) patients, respectively. cagA and vacA were found higher in the peptic ulcer group but they were not significantly different from the other groups. In conclusion, the study supported the use of Western blot method in the determination of humoral immunity profiles against antigens of Hp and antibodies against cagA and vacA specific virulence factors. This method can be used to scan patients with virulent-strain-risk. In addition, this method can be used in cases who require investigation of IgG profiles against Hp antigens (in clinical progression, unresponsiveness to therapy, etc.).

Özet

Bu çalışmada, peptik ülser ve gastroduodenit tanısı alan olgularda, etiyolojik olarak Helicobacter pylori saptanmasında kullanılan konvansiyonel test yöntemleri sonuçlarıyla, H. pylori Western blot IgG ve IgA testi sonuçlarının korelasyonunu belirlenmesi; ayrıca H. pylortnm başlıca virulans faktörleri cagA ve vacA dahil çeşitli antijenlerine karşı meydana gelen antikorların saptanması ve bu faktörlerin endoskopik tanılarla ilişkisinin değerlendirilmesi amaçlanmıştır. Üst gastro-intestinal endoskopisi yapılan 63 hastanın %20.6'sı peptik ülser, %74.6'sı gastrit ve gastroduodenit olarak sınıflandırıldı. Helicobacter pylori varlığı, hastalardan alınan biyopsi örneklerinde dokuda üreaz testi, histopatoloji ve kültür incelemeleriyle araştırıldı. Bu incelemelere göre; 63 hastanın 44 (%69.8)'ü H. pylori pozitif, 19 (%30.2)'u H. pylori negatif olarak saptanmıştır. Helicobacter pylori pozitif ve negatif hasta grupları ile Western blot IgG ve IgA sonuçları karşılaştırıldı. Böylece Western blot IgG ve Western blot IgA yöntemlerinin duyarlılık, özgüllük, pozitif prediktif değer, negatif prediktif değerleri sırasıyla %92.8, %77.7, %73.5, %57.1; %31.7, %31.2, %72.2, %28.2 olarak bulundu. Çalışmada, Western blot IgG (+) hastalarda, H. pylortnm en fazla %83, %79.2, ve %52.8 ile cagA, ureB ve ureA alt birimlerine karşı, IgA (+) olanlarda da %83.3, %77.7 ve %27.7 ile aynı antijenlere karşı antikor belirlendi. cagA ve vacA saptanması, peptik ülserli grupta oran olarak daha fazla olsada diğer grupla aralarında istatistiksel olarak anlamlı bir fark görülmedi. Sonuç olarak çalışma; Western blot yönteminin cagA ve vacA'ya karşı antikor saptanması gibi H. pylortnm pesifjk virulans faktörleri ve antijenlerine karşı gelişen humoral immünite profillerinin belirlenmesinde ve virulan köken-riskli endoskopik tablo ilişkisindeki hastaların taranmasında kullanılabileceği fikrini vermiştir. Ayrıca, yöntem H. pylori antijenlerine karşı oluşan IgG profillerinin araştırılması gereken durumlarda (klinik tablo progresyonu, tedaviye yanıtsızlık, vb) yararlanılabilecek bir yöntem olduğu izlenimini bırakmıştır.

🔖

Cite This Article

AYGÜN, G., KARATAŞ, A., BAĞDATLI, Y., KOCAZEYBEK, B., SARIBAŞ, S., ALTUN, S., BİRER, K. S., BAL, K., ALTAŞ, K., ASLAN, M. (2022). The value of Western blot test in the serologic diagnosis of Helicobacter pylori infections. İnfeksiyon Dergisi, Cilt: 18 - Sayı: 4, 467–472. https://ajindex.com/articles/546536

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (17)

  1. Dunn BE, Cohen H, Blaser MJ. Helicobacter pylori. Clin Microbiol Rev 1997; 10: 720-41
  2. Everhart JE. Recent developments in the epidemiology of Helicobacter pylori. Gastroenterol Clin North Am 2000; 29: 559-79
  3. Cohen H. Peptic ulcer and Helicobacter pylori. Gastroenterol Clin North Am 2000; 29:775-91
  4. Israel DA, Peek RM. Review article pathogenesis of Helicobacterpy/ori-induced gastric inflammation. Aliment Pharmacol T/7er2OO1; 15:1271-90
  5. NIH Consensus Conference: Helicobacter pylori in peptic ulcer disease. JAMA 1994; 272: 65-9
  6. Parsonnet J, Friedman GD, Vandersteen DP, Chang Y. Helicobacter pylori infection and the risk of gastric carcinoma. N EngI J Med 1991; 325:1127-31
  7. Parsonnet J, Hansen S, Rodriguez L, Gelb A, Warnke R. Helicobacter pylori infection and gastric lymphoma. N EnglJ Med 1994; 330:1267-71
  8. Uemura N, Okamoto S, Yamamoto S, et al. Helicobacter pylori infection and the development of gastric cancer. N EngI J Med 2001; 345: 784-9
  9. Atherton JC, Cao P, Peek RM, Tummuru MKR, Blaser MJ, Cover TL. Mosaicism in vacuolating cytotoxin alleles of Helicobacter pylori. J Biol Chem1995; 270:1771-7
  10. Atherton J, Covacci A. Pathogenic properties of H. pylori. Current Opinion in Gastroenterology 1997; 13: 20-4
  11. Go MF, Crowe SE. Virulance and pathogenicity of Helicobacter pylori. Gastroenterol Clin North Am 2000; 29: 649-71
  12. Atherton JC, Peek Jr RM, Tham KT, Cover TL, Blaser MJ. Clinical and pathological importance of heterogeneity in vacA, the vacuolating cytotoxin gene of Helicobacter pylori. Gastroenterology1997; 112: 92-9
  13. Graessle S, Grabher G, Gapp G, et al. Immune response to natural and recombinant antigens of Helicobacter pylori in patients with dyspeptic complaints. Eur J Microbiol Infect Dis 1999; 18: 636-42
  14. Rudi J, Kolb C, Maiwald M, et al. Diversity of Helicobacter pylori vacA and cagA genes and relationship to vacA and cagA protein expression, cytotoxin production, and associated diseases. J Clin Microbiol 1998; 36: 944-8
  15. Arents NLA, Zwet AA, Thijs JC, et al. The importance of vacA, cagA and iceA genotypes of Helicobacter pylori infectiorrin peptic ulcer disease and gastroesophageal reflux disease. Am J Gastroenterol 2001; 96:2603-8
  16. Evans DG, Queiroz DMM, Mendes EN, Evans DJ. Helicobacter pylori cagA status and s and m alleles of vacA in isolates from individuals with a variety of H. py/orf-associated gastric diseases. J Clin Microbiol1998; 36:3435-7
  17. Yamaoka Y, Souchek J, Odenbreit