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Biomedical subjects

C A Rubio

Publications and source records attributed to C A Rubio.

At least 19 recordsLinked to original sources
PubMed1992

Normal colon of Sprague-Dawley rats. An immunohistochemical study.

The patterns of expression of the human-tumor-associated antigens, CO17-1A, GA73-3, BR55-2, GICA19-9, CA50 and carcino-embryonic antigen (CEA) were studied in the normal colonic mucosa (the last three also in the serum) of Sprague-Dawley rats. Four immunohistochemically different segments were identified: caecum, ascending colon, transverse colon and descending colon. The immunohistochemical reactions of the cells at the lower part of the crypt were essential for the distinction of the four segments. In the caecum, the MAbs 17-1A, 73-3 and 19-9 stained the glycocalyx of the cells of the lower part of the crypts and the Golgi apparatus of the intercalated cells (IC). MAb55-2 stained very weakly the goblet-like cells (GLC) of the lower part of the crypt of transverse colon, in addition to a nearly complete lack of reaction in the upper part of the crypts. In the ascending colon, the lower part of the crypts showed a characteristic diffuse staining of the intercalated cells with MAb55-2. The perinuclear and mucosal staining observed in the GLC of the transverse colon with MAbs 17-1A, 73-3 and 19-9 as against the supranuclear and Golgi zone staining observed in the GLC/goblet cells (GC)/columnar cells (CC) of the lower part of crypts of the descending colon with the same MAbs, distinguished the former segment from the latter. The IC demonstrated by immunohistochemistry in the lower parts of the crypts of caecum and ascending colon appear to correspond to the replicating cells of the colonic crypts.

Animals↗
PubMed1992

Five types of pyloric cells in the antral mucosa of the stomach.

Only one type of pyloric cells in the exocrine antral glands is usually described in the literature. The review of 100 gastrectomy specimens revealed 5 types of pyloric cells: one composed of "ordinary" pyloric cells (i.e. cuboidal cells with ill-defined borders, pale, bubbly cytoplasm with an inconspicuous cytoplasmic network). The second type was characterized by pyloric cells with a small, regular vacuole, usually in a subnuclear position. The vacuole in such cells was negative for mucous stains. The third type of pyloric cells had a large intracytoplasmatic vacuole. Cells with this characteristic were found in cystically dilated pyloric glands. The vacuoles in such cells were usually negative for mucous stains although a rim of PAS or alcian blue positive substance was found in some vacuoles. The fourth type of pyloric cells had eosinophilic granules in the cytoplasm. These granules were proven to contain lysozyme. The fifth type had a non-vacuolated, homogeneous ("glassy") cytoplasm which was weakly positive for PAS but negative for acid mucins or mannosides. While the significance of the various types of pyloric cells herein described remains unclear, their easy identification in H & E stained preparations would permit more elaborated studies with histochemistry, immunohistochemistry and/or transmission electron microscopy in the future.

Cytoplasm↗
PubMed1992

The characteristics of mitotic figures in jejunal mucosa of patients with celiac disease.

The morphologic characteristics of the mitotic figures present in the jejunal mucosa of 23 pediatric patients having gluten enteropathy were recorded. Of the 851 mitoses found, 4.9% were in prophase, 39.9% in prometaphase, 29.5% in metaphase, 22.3% in anaphase, and 3.3% in telophase. Of the 851 mitoses found, 98.8% were considered to be morphologically normal and the remaining 1.2% were considered atypical. The occurrence of atypical mitoses in the jejunal mucosa of pediatric patients was unexpected. However, because jejunal adenocarcinomas in celiac patients are known to be rare, the plausible explanation for the present findings is that the occurrence of atypical mitoses may mirror morphologic variations from the normal mitotic pattern occurring in a rapidly proliferating mucosa, such as that of patients with gluten enteropathy.

Celiac Disease↗
PubMed1992

Low frequency of intestinal metaplasia in gastric biopsies from Mexican patients: a comparison with Japanese and Swedish patients.

A systematic analysis of the cellular and structural components of intestinal metaplasia (IM) was carried out in 691 consecutive endoscopic gastric biopsies from Mexicans patients. Two-thirds of the patients (461 or 66.7%) had chronic gastritis, 27.6% (or 191 patients) had gastric ulcers and 5.6% (39 patients) gastric carcinomas. IM was found in 17.4% of the gastric biopsies. While IM was present in 27.7% of patients with gastric peptic ulcer, patients with gastric malignancy had only 18.7%, and the lowest rate (13.4%) was found in 461 biopsies from patients with chronic gastritis. IM was influenced by the age but not by the sex of the patients. Only one of 120 biopsies with IM (0.8%) had incomplete IM (a lesion claimed to be a precursor of gastric carcinoma). In a previous study it was found that 32.3% of 359 Swedish patients and 59.2% of 625 Japanese patients with chronic gastritis had IM, the proportion of incomplete IM being 23.3% and 25.1%, respectively. The low frequency of IM among Mexicans (a population with a low incidence of gastric carcinoma), contrasts with the moderate frequency of IM among Swedes (who have a moderate gastric cancer incidence) and with the high frequency of IM among Japanese (with a high incidence of gastric carcinoma). These findings recorded in disparate geographical regions strongly support the view that IM is a lesion evoked by environmental factors and associated with gastric carcinogenesis.

Adult↗
PubMed1992

Quantitation of gastric intestinal metaplasia by morphometry in Japanese patients.

With the aid of an image processor, the length of the intestinal metaplasia (IM) was recorded in 33 gastrectomy specimens (23 with early gastric cancer and 10 with gastric peptic ulcer). A total of 1917 sections were analyzed. The length of the areas with IM and the total length of the muscularis mucosa were measured in individual sections. The resulting ratio (length of IM/length of muscularis mucosa) was noted as the intestinal metaplasia index (IMI), as an expression of the extension of IM in the specimens. The IMI was influenced by the age of the patient and by the histologic type of the tumor: a higher IMI was found among older patients and among patients with adenocarcinoma of intestinal type. A comparison with a similar study done in gastrectomy specimens from Swedish patients indicates that despite the latter group being older, and the tumors being more advanced, the IM was much more extended in the gastric mucosa of the Japanese patients with gastric adenocarcinomas of intestinal type. From the results it is suggested that extended IM in the gastric mucosa may have some bearing on the histogenesis of gastric carcinomas, particularly adenocarcinomas of intestinal type.

Adenocarcinoma↗
PubMed1992

Eosinophilic bodies in pyloric and Brunner's gland cells.

A previously unreported cell phenotype occurred in the pyloric and Brunner glands in two gastrectomy specimens. The cells were characterised by homogeneous, eosinophilic material in the cytoplasm. The eosinophilic material had an abnormally strong reactivity for Cystatin C, a protein found recently in the normal secretion of pyloric and Brunner's gland cells. The reason for the apparent cytoplasmic accumulation of cystatin C in the two patients described remains unclear.

Brunner Glands↗
PubMed1991

Intraepithelial bodies in colorectal adenomas: Leuchtenberger bodies revisited.

The presence of intraepithelial inclusion bodies (Leuchtenberger bodies) was recorded in rectal or colonic specimens from 130 patients. Large to moderate number of intraepithelial bodies were recorded in 81.8 percent of 55 colorectal adenomas from patients with familial adenomatous polyposis (FAP). Conversely, none of the 55 non-FAP adenomas or of the 20 specimens with ulcerative colitis (10 with dysplasia) had similar amounts of intraepithelial granules. Feulgen studies demonstrated that the granules contain DNA and are probably nuclear fragments of destroyed lymphocytes. Although the pathogenesis of this phenomenon remains obscure, it appears that the presence of large to moderate number of intraepithelial bodies in colorectal adenomas should strongly raise the suspicion of FAP.

Adenoma↗
PubMed1991

Atypical mitoses in colorectal adenomas.

The frequency of spontaneously occurring mitotic figures, the proportion atypical mitoses and spatial position (vertical, oblique or horizontal) of metaphasial plates were studied in 62 specimens: 47 with colorectal adenomas, and 15 with chronic ulcerative colitis (control cases). The characteristics of the atypical mitoses at pro-phase, pro-metaphase, metaphase, anaphase and telophase were defined and illustrated. The results indicated that atypical mitoses occurred in 8.9% in control patients, in 37.2% of the specimens tubular adenomas having low-grade dysplasia, in 80.8% in tubular adenomas with high-grade dysplasia, in 68.5% of villous adenomas with low-grade dysplasia and in 65.5% of villous adenomas with high-grade dysplasia. For villous adenomas with high-grade dysplasia having invasive growth, 81.3% of atypical mitoses was recorded. Oblique or horizontal metaphasial plates were present in 8% of the metaphases in control cases but in as much as 25% in tubular adenomas with low-grade dysplasia, in 37% of those with high-grade dysplasia, in 42% for villous adenomas with low-grade dysplasia, in 56% for those with high-grade dysplasia and in 53% for villous adenomas with invasive growth. The classification of the various degrees of dysplasia is at present done by the characteristic of the dysplastic cells at interphase. This paper demonstrates that qualitative and quantitative morphological alterations of the mitotic apparatus takes place in the various histological types of colorectal adenomas. Perhaps both the number of atypical mitoses and the spatial position of the mitoses should be registered in attempts to shed more light on the biological behaviour of adenomatous lesions of the colorectal mucosa.

Adenoma↗
PubMed1991

Further studies on the musculo-fibrous anomaly of the Barrett's mucosa in esophageal carcinomas.

A total of 50 esophagi with carcinoma were reviewed for the presence of histological changes in the subepithelial tissues of the Barrett's mucosa. Those changes consisted in the thickening of the muscularis mucosae, the presence of muscle fibres in the lamina propria mucosae, fibrosis of the submucosa and sometimes total obliteration of the subepithelial tissues by collagen-rich sclerosis. Those changes have been connoted as "musculo-fibrous anomaly". Barrett's mucosa was present in all 18 specimens with adenocarcinoma and in 13 of the remaining 32 specimens with squamous cell carcinoma. Musculo-fibrous anomaly of the Barrett's mucosa occurred in all 18 specimens with adenocarcinoma and in 10 of the 13 specimens with a concomitantly growing squamous cell carcinoma. Esophageal and metaplastic glands were surrounded, compressed and deformed by the fibrotic tissue. The histological changes described explain the difficulties in the differential diagnosis--in biopsy specimens--between normal glands or glands with dysplastic changes "trapped" in the collagen-rich fibrotic tissue and true invasive adenocarcinoma of the Barrett's esophagus.

Adenocarcinoma↗
PubMed1991

Geographic variations in the histologic characteristics of the gastric mucosa.

Histologic sections of 205 gastrectomy specimens, which were obtained for benign and malignant diseases, were reviewed. All patients were Mexican nationals. The following histologic features were recorded: intestinal metaplasia, intramucosal cysts, ciliated gastric cells, and different types of pyloric cells ("ordinary"; with granular cytoplasm; with small cytoplasmic vacuoles; with large cytoplasmic vacuoles; or with homogeneous "glassy" cytoplasm). The percentage of specimens showing intestinal metaplasia was similar in those containing gastric ulcers (42.7%) or adenocarcinomas (50.0%). Intestinal metaplasia was decreased in men 59 years of age or older and in women 69 years of age or older. Diffuse-type adenocarcinoma accounted for 90% of the gastric tumors. Only 3 of the 205 specimens (1.9%) contained intramucosal cysts, and only 1 (0.4%) showed ciliated cells. Pyloric cells with granular cytoplasm were observed in 21.2% of the specimens, and pyloric cells with small cytoplasmic vacuoles were seen in 1.9%. Pyloric cells with large vacuoles or "glassy" cytoplasm were not found in any case. These results indicate differences in the proportions of several histopathologic findings in the gastric mucosa, between Mexicans and other ethnic groups that have been investigated in previous surveys. The authors' findings support the hypothesis that different environmental factors, acting in disparate geographic regions, may account for dissimilarities in the histologic appearance of "normal gastric mucosa."

Adolescent↗
PubMed1991

Ciliated gastric cells among Japanese living in Hawaii.

A total of 129 consecutive gastrectomy specimens from Japanese (99), Philippinos (11), Hawaiians (8), Koreans (5), Chinese (4) and Caucasians born in Hawaii (2) were examined under high-power light microscopy (1000 x) for the presence of ciliated gastric cells. Fifty-two of the 129 gastrectomy specimens (40.3%) contained ciliated cells. Ciliated cells were found in the basal segments of antral glands (usually cystically dilated) whose superficial segments had undergone intestinal metaplasia. The presence of ciliated cells in the gastric mucosa was influenced by the age of the patient and by the degree of intestinal metaplasia: the older the patient, the greater the degree of intestinal metaplasia and the greater the frequency of specimens with ciliated cells. The presence of ciliated cells was also influenced by the type of lesion in the specimen. Although the highest frequency (47.2%) was found in stomachs removed for adenocarcinoma, a substantial number of stomachs removed for gastric ulcer also showed that change (36%). The data suggest that increasing age and advanced atrophic gastritis, especially of the antrum, provide the necessary conditions that lead to the development of cilia, not only in Japanese subjects, but in other Hawaiian ethnic groups as well.

Adult↗
PubMed1991

The topographic distribution of lymphocytic gastritis in gastrectomy specimens.

Forty-eight entire gastrectomy specimens received consecutively at this Department were cut into blocks for histologic examination. Focal or more extended areas of chronic gastritis (i.e. superficial or atrophic with or without intestinal metaplasia) were present in all 48 specimens. In addition, two of the 48 specimens had a large number of lymphocytes in the surface and foveolar epithelium of the mucosa. In the literature the latter is regarded as "lymphocytic gastritis". Lymphocytic gastritis was found in all 156 sections obtained from the two specimens. This lympho-epithelial phenomenon was present even in areas lacking chronic inflammation in the subjacent lamina propria mucosae. From our results it would appear that while chronic gastritis has a focal or a regional topographic distribution, lymphocytic gastritis includes the entire surface-foveolar epithelium of the gastric mucosa.

Adenocarcinoma↗
PubMed1991

Quantification of acid mucins in the descending colon of rats having simultaneously growing colonic tumors.

The acid mucins contained in goblet cells of the descending colon of 34 male Sprague-Dawley rats were histochemically labeled by Alcian blue pH 2.5 and quantified in an image analyzer (Cortex Controller). Twenty-two of these 34 rats were treated with 1,2-dimethylhydrazine (DMH) suspended in EDTA solution as a stabilizing agent and the remaining 12 rats with EDTA only. Of the 22 DMH-treated rats, 11 had concomitantly an adenocarcinoma elsewhere in the colon and the remaining 11 rats had no colonic tumors despite DMH treatment. The results indicated that Alcian blue-positive areas occupied 34.5% of the mucosa of the descending colon in tumor-bearing rats, and 35.2% in non-tumor-bearing DMH-treated rats. For EDTA-treated rats the percentage of mucosa occupied by Alcian blue-positive cells was 48.1%. The difference between DMH-treated rats (with or without tumors) and EDTA-treated rats was significant (p less than 0.001). These results suggest that the decrease of Alcian blue areas is related to the protracted treatment with DMH. Whether the decrease in acid mucins is induced by the carcinogen per se or whether it represents a true biochemical premalignant change at the cytoplasmic level remains to be elucidated.

1,2-Dimethylhydrazine↗
PubMed1991

A method to quantitate the relative nuclear area of colorectal polyps by image analysis.

Image analysis of the nuclear area was performed on Feulgen-stained sections from 94 colorectal polyps: 57 colorectal adenomas with or without invasive growth, 28 hyperplastic polyps and 9 Peutz-Jeghers hamartomas (without dysplasia or carcinoma). The lowest mean values of nuclear area were recorded in control cases: in hyperplastic polyps (27.3%), followed by hamartomatous polyps (34.7%). The nuclear area was significantly increased in tubular adenomas with low-grade dysplasia (37.9%), in villous adenomas with low-grade dysplasia (41.16%) and in tubular and villous adenomas with high-grade dysplasia (47.0% and 46.0%, respectively). The nuclear area in villous adenomas with invasive growth was significantly higher than in all other adenomas without invasive growth (56.0%). The present data suggest that the nuclear area in colorectal polyps (as deduced by image analysis studies) correlates well with the degree of nuclear atypia. Thus, measurements of nuclear area appear to be an important parameter in studies aiming to elucidate the malignant potential of these lesions.

Adenoma↗
PubMed1990

Control cells for image cytometric DNA analysis of esophageal tissue and the influence of preoperative treatment.

The nuclear DNA content of 4,960 normal cells in 30 esophagectomy specimens was assessed by image cytometry. In relation to intermediate squamous epithelial cells, the mean transmission values were 25.6% higher for basal squamous epithelial cells, 10.1% higher for fibroblasts and 16.2% lower for lymphocytes. The interslide coefficient of variation (CV) was similar for intermediate and basal squamous epithelial cells, 20.2% and 18.9%, respectively, while fibroblasts and lymphocytes displayed lower interslide CVs, 10.5% and 8.8%, respectively. In spite of their high interslide CVs, the mean DNA values of intermediate and basal squamous epithelial cells had the highest intraslide correlation. This correlation indicates that the preparative and analytical differences between slides that result in alterations in mean DNA values affect squamous epithelial cells of similar origin, size and shape in an analogous manner. Basal squamous epithelial cells replicate their DNA and contain more than the diploid amount; therefore, normal intermediate squamous epithelial cells are suggested as control cells to define the 2c reference value for further DNA studies on squamous epithelial lesions of the esophagus. Preoperative irradiation, with or without chemotherapy, did not alter the DNA values of the investigated control cells.

Adenocarcinoma↗
PubMed1979

The basement membrane in experimentally induced atypias and carcinoma of the uterine cervix in mice. An immunofluorescence study.

Basement membrane-specific antigens of the squamous epithelium of the uterine cervix were investigated in 19 normal mice, in 7 mice with cervical atypia and in 3 mice with invasive carcinoma. Cervical atypia and carcinoma were induced by local application of benzo(a)pyrene. Basement membrane-specific antigens were demonstrated by immunofluorescence with sera from patients with bullous pemphigoid. Both normal squamous cervical epithelium and atypical cervical epithelium showed the presence of a continuous, clearly delineated basement membrane. Clusters of invasive squamous carcinoma were also surrounded by a fluorescent basement membrane which, however, appear fragmented or discontinuous. The results suggest that the ability of cervical squamous cells to secrete basement membrane antigens is not completely lost during carcinogenesis, thus substantiating our previous observations in the cervix of human subjects.

Animals↗
PubMed1979

Behavior of cervical epithelium during carcinogenesis: autoradiography of tritiated cytidine in the C57BL mouse.

The autoradiographic patterns of the cervical epithelia of 39 virgin C57BL mice after in vivo injection of [3H]cytidine was investigated. Of the 22 animals painted with benzo[a]pyrene for 5 months, 8 developed intraepithelial atypias and 2 had invasive carcinoma. The mean number of silver grains in individual cells increased from histologically normal cervical epithelium through atypical epithelium to invasive carcinoma. It is apparent that the autoradiographic patterns in normal, atypical, and invasive carcinoma cells reflected quantitative differences in cytidine incorporation. These differences may denote increased demand for RNA precursors in the cervical epithelium during carcinogenesis.

Animals↗