Mucin Histochemistry Research Articles

Helicobacter Pylori and Metaplastic Changes in Chronic Cholecystitis: A Correlation Study

Abstract Introduction: Various types of metaplastic changes, such as gastric metaplasia (foveolar type or antral type) and intestinal metaplasia, are observed in chronic cholecystitis but not in normal mucosa. Helicobacter species can be detected in the bile and gallbladder tissue of patients with benign gallbladder disease. Objective: The present study aimed to observe the correlation between chronic cholecystitis and the presence of Helicobacter pylori as well as the different types of metaplastic changes in gallbladder mucosa. Materials and Methods: This descriptive, observational study was conducted at the Departments of Pathology and Surgery at a tertiary care medical college and hospital from April 2021 to March 2022, using a cross-sectional design. All confirmed cases of chronic cholecystitis, with or without cholelithiasis, were included in the study. Results: Intestinal metaplasia was the most common type of metaplastic change in the gallbladder epithelium in chronic cholecystitis in this region. PAS and Alcian Blue positivity were significantly higher in cases with metaplasia compared to those without metaplasia. H. pylori was detected in 3 cases (1.55%) of chronic cholecystitis in this study population. Conclusion: Mucin histochemistry may help identify early metaplastic changes in gallbladder epithelium. The use of a combination of methods for the detection of H. pylori in gallbladder tissue may increase the detection of positive cases.

Prevalence of different gallbladder pathologies and usefulness of mucin histochemistry in early diagnosis of metaplasia and carcinoma of gallbladder

Background: Non-neoplastic and neoplastic diseases of gallbladder are most prevalent in northern and north-eastern states of Uttar Pradesh, Bihar, Orissa, West Bengal, and Assam in India. Chronic cholecystitis, the most common pathology of gallbladder is often associated with metaplasia of epithelium, leading to increased susceptibility to malignant transformation. Along with histopathological examination, mucin histochemistry is useful in early detection of metaplasia and thereby predicting metaplasia-dysplasia-carcinoma sequence. Aims and Objectives: The objective of this study was to estimate the prevalence of neoplastic and non-neoplastic diseases of gallbladder and to determine the usefulness of mucin histochemistry in early diagnosis of metaplasia and carcinoma of gallbladder. Materials and Methods: A cross-sectional observational study was conducted in R. G. Kar Medical College, Kolkata, over a period of 18 months. Total 401 cholecystectomy specimens were studied. In every case, following sequence of examinations was performed-gross examinations, histopathological examination, and mucin histochemistry. Results: All the available information was meticulously documented in tables and charts, software was used to calculate the statistical significance and efficacy of mucin histochemistry as a diagnostic tool. Conclusion: We found that mucin histochemistry is statistically significant and has positive predictive value in early diagnosis of metaplasia and carcinoma of gallbladder.

Histochemistry and transcriptomics of mucins and peritrophic membrane (PM) proteins along the midgut of a beetle with incomplete PM and their complementary function

The midgut of Zabrotes subfasciatus (Coleoptera) and other insects may have regions lacking a peritrophic membrane (matrix, PM) and covered with a jelly-like material known as peritrophic gel. This work was undertaken to test the hypothesis that the peritrophic gel is a vertebrate-like mucus. By histochemistry we identified mucins along the whole midgut, which contrasts with the known occurrence of PM only at the posterior midgut. We also analyzed the expression of the genes coding for mucus-forming mucins (Mf-mucins), peritrophins, chitin synthases and chitin deacetylases along the midgut and carcass (insect without midgut) by RNA-seq. Mf-mucins were identified as proteins with high O-glycosylation and multiple tandem repeats of Pro/Thr/Ser residues. Peritrophins were separated into PM proteins, cuticular proteins analogous to peritrophins (CPAPs) and ubiquitous-chitin-binding domain-(CBD)-containing proteins (UCBPs). PM proteins have at least 3, CPAP one or 3, and UCBPs have a varied number of CBDs. PM proteins are more expressed at midgut, CPAP at the carcass, and UCBP at both. The results showed that most PM proteins are mainly expressed at the posterior midgut, together with midgut chitin synthase and chitin deacetylase, and in agreement with the presence of PM only at the posterior midgut by visual inspection. The excretion of most midgut chitinase is avoided, suggesting that the shortened PM is functional. Mf-mucins are expressed along the whole midgut, probably forming the extracellular mucus layer observed by histochemistry. Thus, the lack of PM at anterior and middle midgut causes the exposure of a mucus, which may correspond to the previously described peritrophic gel. The putative functional interplay of mucus and PM is discussed. The major role of mucus is proposed to be tissue protection and of PM to enhancing digestive efficiency by allowing enzyme recycling.

Histopathological Study of Gastric Lesions and its Correlation with Mucin Histochemistry and Helicobacter Pylori Infection

Background: Gastric disorders are responsible for a great deal of mortality and morbidity and are one of the most common encountered problems in clinical practice. H. Pylori infection is responsible for majority of acid peptic disease and is also a known carcinogen. Intestinal metaplasia is considered a precancerous lesion. We studied the incidence of H. pylori infection and mucin histochemistry of different gastric lesions.
 Methods: This study was conducted for a period of 1 year, in 50 gastric specimens received for histopathological study in the Department of Pathology, AMCH. Slides were stained with routine H&E and Giemsa for H. pylori detection. PAS/AB stain (at pH 2.5 & pH 1.0) was done to study mucin histochemistry.
 Results: Out of 50 cases, 58% cases were malignant and 42% cases were benign. H. Pylori was seen in 42% cases. IM was observed in 40% of gastric lesions. IM was more common in malignant lesions. On subclassification, Type 1 and 2 IM were seen almost equally in both benign and malignant gastric lesions, but Type 3 IM was more common in malignant lesion. Incidence of IM was higher in intestinal than diffuse adenocarcinoma. A statistically significant association was seen between H. Pylori infection and IM.
 
 Conclusion: Routine detection of H. pylori by special stains and mucin study in all gastric biopsy specimens helps in early detection of precancerous gastric lesions.

Mucin histochemistry as a tool to assess rostral digestive tract health in a teleost model (Danio rerio).

The zebrafish (Danio rerio), a small agastric teleost fish, has become a popular species to model diseases of the gastrointestinal tract. Remarkably, its rostral digestive tract has been largely understudied. To allow for accurate reporting and to improve the translational potential of this research model, the present study first proposes terminology for the different regions of the rostral digestive tract in zebrafish. Based on markers (in particular mucin histochemistry) which are easy to apply in routine histopathology laboratories, five regions are identified, in line with descriptions for carp, a close relative of zebrafish. The mucin histochemical staining is specific and distinct in each region identified, and can be used as a tool to assess health of the rostral digestive tract. In addition, we identify a transitional zone between the oesophagus and intestinal bulb which may represent a remnant of a rudimentary stomach.

A Study of Histochemical Characteristics of Mucosubstances in Normal Endocervical Glands

Background: The apical epithelial surfaces of mammalian respiratory, gastrointestinal, and reproductive tracts are coated by mucus, a mixture of water, ions, glycoproteins, proteins, and lipids. Mucins are mainly of two types- Neutral and Acidic. Mucus plays an important role in reproductive function and defence of the female reproductive tract. Objectives: To know the mucin distribution in normal endocervical glands. Methodology: This is a retrospective, observational , analytical, case control study aimed to evaluate mucin histochemical pattern in normal endocervical glands. Ten histologically proven blocks of normal endocervical glands were taken. Tissue sections were stained by, PAS, PAS-diastase, Phenylhydrazine-PAS, Alcian blue pH 2.5, Alcian Blue pH 1, combined Alcian blue-PAS, Aldehyde fuschin and combined Aldehyde fuchsin Alcian blue techniques. Results: Results were tabulated according to colour intensity into different grades ranging from + to ++++. Regarding mucin histochemistry of normal endocervical glands; the epithelium and glands show mixture of both neutral and acidic mucins. Acidic mucins are more in amount than neutral. In acidic mucins, sialomucins are predominantly seen. Conclusion: Mucin histochemical patterns serve as valuable, cost-effective tool for diagnosis in histopathology and for the researchers in histology, where a slight change in the mucin pattern may help in the early diagnosis of the disease process.

Morphometric analysis and mucin histochemistry of gallbladdersurface and glandular epithelium in swine

The aim of thestudy was to perform morphometric analysis and to distinguishhistochemically the variety of mucins in surface and glandular gallbladderepithelium in swine at different ages. The histochemical analyses by usingalcian blue staining at different pH and alcian blue-PAS technique alloweddistinguishing neutral and acidic mucin expression in the surface andglandular epithelium of gallbladder’s fundus, body and neck where age- andsite-specific localisation of mucin content was defined. Goblet cells alsoexpressed both neutral and acidic mucins. Morphometric analysis allowedestimating the height of the surface and glandular epithelium, diameter ofglands and crypts, and comparing these parameters between the three agegroups and three gallbladder parts. The goblet cells were observed in thegallbladder neck only. The morphometric and histochemical analyses extendthe knowledge on structural and topographic features of the studiedgallbladder components that could be useful as reference data for variety ofexperiments on this organ.

Mucin Histochemistry in Normal and Adenocarcinoma of Colorectum- A Comparative Study

Mucin Histochemistry in Normal and Adenocarcinoma of Colorectum- A Comparative Study

Diagnostic Utility of Mucin Histochemistry in Large Intestinal Specimens ---The View Point

Diagnostic Utility of Mucin Histochemistry in Large Intestinal Specimens ---The View Point

Utility of Mucin Histochemistry in Prostatic Neoplasms with Review of Historical Background

Utility of Mucin Histochemistry in Prostatic Neoplasms with Review of Historical Background

'Microcystic pattern' should be recognised as part of the morphological spectrum of solid-pseudopapillary neoplasm of the pancreas.

Solid pseudopapillary neoplasm (SPN) is an uncommon pancreatic tumour characterised by solid and pseudopapillary growth patterns. We have observed SPNs can show a microcystic pattern (microcystic SPN), which has been poorly described and may be confused with microcystic neoplasms. We conducted the present study to clarify the clinicopathological and immunohistochemical features of microcystic SPNs. We examined a consecutive series of 44 SPNs and 10 serous cystadenomas (SCAs), and classified them into 13 microcystic SPNs (29.5%) and 31 conventional SPNs (70.5%). Clinicopathological analysis, immunohistochemical staining and mucin histochemistry were performed. Clear cell change, hyalinised stroma and haemorrhage were observed significantly more frequently in the microcystic SPNs compared to the conventional SPNs. Immunohistochemically, the microcystic SPNs showed significantly lower frequencies of CD10 (0%) and CD56 expression (62%) compared to the conventional SPNs (87%; P<0.001, 90%; P<0.0085, respectively). There were no significant differences in other clinicopathological and immunohistochemical features between the two groups (i.e. the nuclear expression of β-catenin, E-cadherin, progesterone receptor (PgR), lack of forkhead box (Fox)L2 and occasional oestrogen receptor (ER), AE1/AE3 expression). Microcystic SCAs lack such a characteristic immunophenotype. The myxoid stroma of microcystic SPNs contained hyaluronan revealed by Alcian blue stain with hyaluronidase digestion. We thus conclude that the microcystic pattern should be recognised as a part of the morphological spectrum of SPNs. Our findings may contribute to the correct diagnosis of the pancreatic neoplasms with the microcystic pattern. In addition, we speculate that stromal change caused by an accumulation of hyaluronan may contribute to the microcystic pattern of SPN.

Histomorphological and mucin histochemical study of the alimentary canal of pangas catfish, Pangasius pangasius (Hamilton 1822)

The present study describes the histological and mucin histochemical properties of the alimentary canal (AC) of the pangas catfish, Pangasius pangasius . The results revealed that the mucosa of the oesophagus was lined by a stratified epithelium containing chloride cells and taste buds which suggested mechanic, gustatory and physiologic roles of the oesophagus in this species. The stomach mucosa was lined by a simple columnar epithelium. The lamina propria-submucosa in cardiac and fundic stomach contained gastric glands. The pyloric stomach had the thickest muscularis layer among all the parts of the AC. The villi showed the maximum height and width in the middle intestine. The tunica muscularis and serosa showed the thinnest thickness among all parts of AC. The mucin histochemistry showed that the goblet cells of oesophagus and intestine contained both neutral and acidic with carboxylated and sulfated mucins and there was not acidic mucins in epithelial cells of the stomach.

An analytical study of histological hazards estimation and comparison between cholecystitis and cholelithiasis by routine, mucin and lipid histochemistry procedures

An analytical study of histological hazards estimation and comparison between cholecystitis and cholelithiasis by routine, mucin and lipid histochemistry procedures

Anatomical and histological structure of the tongue and histochemical characteristics of the lingual salivary glands in the Persian squirrel (Sciurus anomalus).

This study was carried out to describe the anatomical, histological and mucinous histochemical characteristics of the tongue in the Persian squirrel. This species is a rodent distributed all over the Middle East and recently has been considered a companion animal. Anatomical observations showed the median sulcus on the apex and absence of a lingual prominence in the body. Light and scanning electron microscopy showed that the filiform papillae cover the entire dorsal surface of the tongue, and their sizes increased approaching the root. The fungiform papillae, which contained 1-4 taste buds, were scattered on the apex, margin, body and root of the tongue. Three vallate papillae were observed on the root, each one surrounded by a groove and crescent pad with taste buds on its lateral walls. The foliate papillae on both margins of the tongue contained several laminae with taste buds. The core of the tongue was composed of lingual glands, skeletal muscles and connective tissues. These glands were confined to the body and root, which were composed of serous cells located anteriorly and mucosal and seromucosal cells placed posteriorly. The mucin histochemistry using the periodic acid-Schiff (PAS), alcian blue (AB) (pH 1.0 and 2.5), PAS-AB (pH 2.5) and aldehyde fuchsin-AB (pH 2.5) techniques showed that the mucosal content included both carboxylated and sulfated acidic mucins with neutral mucins. The results of this study could contribute to the knowledge of the morphological characteristics of the wild animal tongue and provide data for comparison with other rodents.

Mucin Histochemistry in Chronic Calculous Cholecystitis and Its Correlation with Histomorphology

Mucin Histochemistry in Chronic Calculous Cholecystitis and Its Correlation with Histomorphology

Prognostic Role of Microvascular Density and Mucin Production in 56 Cases of Adenocarcinoma of Lung- An Experience from a Center in Lahore, Pakistan

Introduction: The relative incidence of adenocarcinoma of the lung is increasing, and it is now the most common primary lung malignancy. This study examines certain clinical and pathological factors which may affect patient survival in lung adenocarcinoma in the developing country of Pakistan. Methods: This is a descriptive study involving 56 patients with biopsy-proven primary adenocarcinoma of lung. Biopsy tissues were reviewed along with medical record case histories. Formalin-fixed, paraffin-embedded tissue specimens were used for mucin histochemistry with mucicarmine, periodic acid Schiff (PAS) and alcian blue stains. Immunohistochemistry (IHC) with monoclonal antibodies against CD34 was used for assessment of microvascular density. Mast cell density was measured on Toluidine blue stained sections. Results: Mean age of patients was 55.96 ± 1.67 years. Male to female ratio was 3:2. 51.8% of patients were smokers, and weight-loss was seen in 46.4% of the patients. A majority (66.1%) had stage III/IV tumors with positive lymph nodes, and 26.8% tumors were mucinous. High mast cell density was found in 32.1% and high microvessel density in 44.6% tumor specimens. Weight-loss, stage, nodal status, mucin production and microvessel density showed significant deleterious effect on patient survival. Conclusions: The current study illustrates that for this population, weight loss, advanced stage of tumor, nodal status, mucin production by the tumor, and increased angiogenesis are predictors of poor survival in patients with primary pulmonary adenocarcinoma. Further prospective work will need to be performed to determine if these factors can assist in prognostication or formulation of treatment plan in newly diagnosed individuals in the general population.

Evaluation of mucin histochemistry in benign and malignant prostatic lesion and their correlationPSA level

Background: The major causes of prostatic enlargement are nodular hyperplasia, prostatitis and neoplasm including prostatic intraepithelial neoplasm. Acidic mucin is absent in benign prostatic glands and is present in some prostatic adenocarcinomas. Mucin stain may be an adjunctive aid in the diagnosis of prostatic adenocarcinoma. This study aims to find out role of acidic mucin in differentiating benign and malignant lesion together with the aid of PSA level.Materials and Methods: A study was done from August 2006 to August 2008. Serum PSA level was performed. Biopsy specimen were processed and stained with Hematoxylin and Eosin as well as Alcian Blue and Periodic Acid Schiff. Data was coded and entered into SPSS v. 11 and Chi-square test and scatter plot was done to analyze the findings.Results: Out of 207 prostatic specimens studied, 78.3% showed BPH with or without prostatitis whereas 12% showed PIN and 8.7% malignancy. PSA density showed statistical significance with p= 0.02, in favor of malignancy. Alcian blue positivity was in 77.8% of malignant cases and 18.5 % in benign cases (p = 0.000003). Acid mucin was more in well differentiating tumours decreasing significantly in high grade malignancies. Combined diagnostic value of PSA&gt;10 ng/ml and Alcian blue positivity showed increase in specificity to 96.8% for diagnosing a malignant lesion, with positive predictive value of 57.1%.Conclusion: PSA density can be used to identify and pick up malignant cases where intermediate levels of PSA values are common. Alcian blue stain can help in assessing the degree of differentiation in malignant cases. DOI: http://dx.doi.org/10.3126/jpn.v4i8.11611 Journal of Pathology of Nepal; Vol.4,No8(2014) 612-616

Chemopreventive effects of garlic and mugwort mixture extract on Helicobacter pylori-associated mouse gastric carcinogenesis

Garlic and mugwort have long been used in traditional medicine to prevent various diseases. Several in vitro studies have reported protective efficacies of garlic and mugwort in cases of gastric cancer. In the present study, we investigated the cancer preventive effects of garlic and mugwort mixture extract (GME) in a Helicobacter (H.) pylori-associated gastric carcinogenesis mouse model. To induce gastric cancer, C57BL/6 mice were treated with N-methyl-N-nitrosourea and H. pylori. Various concentrations of GME (0, 100, 500, and 1,000 ppm) were then fed to the mice for 38 weeks, after which the tumor tissues were examined for histopathology, mucin histochemistry and -catenin. The incidence of gastric tumors was significantly lower in the highest dose GME-treated mice (46.7%) than control mice (85.7%) (p

Urachal Tumor: Mucinous Cystadenoma of Undetermined Malignant Potential

Urachal malignancy is a rare and represents less than one percent of bladder neoplasms. Urachal mucinous neoplasms are still rare and include both villous adenomas and invasive adenoma carcinomas and they have insidious course and variable clinical presentation. We present a case report of 58 year old male who presented with lower abdominal mass since 6-8 months with no lower urinary tract symptoms, significant history of loss of weight and appetite. On examination the infra-umbilical midline mobile mass of 10×10 cms was palpable. CT showed lobulated cystic mass with internal septations and calcifications superior to bladder with indentation and without any local or distant metastasis. Mass was excised in toto with partial/ segmental cystectomy. Histology revealed mucinous cystadenoma of undetermined malignant potential, rarest histological variety and difficult to diagnose on basis of mucin histochemistry and immunohistology. Two-year follow-up did not show any local tumor recurrence.

A histopathological and histochemical study of cholecystitis

Aims: the present study mainly aimed to assess the qualitative and quantitative assessment of gallbladder mucins in chronic calculous cholecystitis, correlating the mucin histochemistry and morphology of the gallbladder in chronic calculus cholecystitis with each other and with chemical composition of gallstones. Methods: Hematoxylin and Eosin stained sections of the selected specimens were screened and one to two sections with adequate amount of well-preserved mucosa with lining epithelium were chosen. the corresponding paraffin blocks were selected and isolated. Four sections were cut on each of the selected blocks for special stains. results: comparison of inflammation and mucin histochemistry, inflammation and metaplasia, composition of calculi and grade of inflammation, composition of stones and mucin