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Biomedical subjects

L R Mills

Publications and source records attributed to L R Mills.

At least 55 records · Page 3Linked to original sources
PubMed1988

Histopathologic features of liver biopsy specimens in sickle cell disease.

Liver biopsy results and clinical records from 13 patients with sickle cell anemia were reviewed to assess the relative importance of local ischemia or of factors unrelated to sickling as a cause of their liver disease. Two of the biopsy specimens were normal and one showed cirrhosis. Nine patients had received multiple blood transfusions and nine had cholelithiasis, of whom two also had choledocholithiasis. Seven had both risk factors. Five had lobular cholestasis and four had acute or chronic hepatitis. One biopsy specimen showed changes of the Budd-Chiari syndrome. Another showed clear portal tract changes of large bile duct obstruction but no mechanical blockage of the biliary system; this suggests the thickened bile as postulated by Muirhead. Otherwise the changes observed were those to be expected in a heavily transfused population with a high prevalence of gallstones.

Adolescent↗
PubMed1987

Multiple squamous papillomas of the esophagus associated with Goltz syndrome.

A 30-yr-old white female with a history of focal dermal hypoplasia (Goltz syndrome), chronic gastroesophageal reflux, and dysphagia was found to have, by barium esophagram and esophagogastroduodenoscopy, multiple 2- to 3-mm papillary projections in the distal esophagus and an esophageal stricture. Biopsy of these lesions revealed squamous papillomas and a benign stricture. Although chronic irritation from gastroesophageal reflux has been suggested as a possible etiology of acquired esophageal papillomas, the previous association of congenital papillomas of the oral mucosa in Goltz syndrome suggests that the multiple papillomas in this patient are congenital in origin.

Adult↗
PubMed1985

Hepatic sinusoidal macrophages in alcoholic liver disease.

Lysozyme is a bacteriocidal enzyme which is a major stable secretory product of mononuclear phagocytes, including hepatic sinusoidal macrophages (HSM), and serves as a good marker for these cells. Patients with alcoholic liver disease (ALD) have decreased HSM function which is reflected in reduced clearance of microorganisms and endotoxin derived from the gut. The HSM population in 54 liver biopsies from patients with ALD was studied using immunoperoxidase staining of lysozyme and was compared with 15 histologically normal controls. In both groups lysozyme positive HSM were more numerous in periportal than perivenous parenchyma. In each zone there were significantly fewer positive HSM in cases of ALD than in controls, in alcoholic hepatitis than in ALD without hepatitis, and in cirrhosis than in ALD without cirrhosis. These findings suggest a decreased population of functionally active HSM in ALD which correlates with severity of liver damage. This might be due to decreased lysozyme content of the entire HSM population or to the existence of two populations, one positive and one negative for lysozyme. The observed decrease in HSM function explains many of the phenomena observed in ALD.

Hepatitis, Alcoholic↗
PubMed1984

Effect of ethanol on the uptake of pyridoxine X HCl in the rat jejunum.

The effects of acute ethanol exposure and chronic ethanol ingestion on jejunal mucosal uptake of 2 microM pyridoxine X HCl (PN) was studied in rats. Experimental models included in vitro everted sacs and in vivo perfused segments. The presence of 4% w/v but not 1% w/v ethanol (mucosal side) acutely enhanced PN uptake by 30 to 76%. Ethanol removal rapidly returned uptake rates to base-line. Histological evidence of mucosal injury in perfused segments paralleled observed changes in PN uptake. After chronic ethanol ingestion (1 yr), PN uptake from media without added ethanol was not statistically different from control values. Conclusions are: 1) acutely, enhancement of PN mucosal uptake by ethanol in rat jejunum is associated with the presence of a high ethanol concentration, is rapidly reversible, and correlates with histological evidence of mucosal injury; and 2) chronic ingestion of ethanol appears to have no further effect on PN uptake in the rat.

Animals↗
PubMed1984

Adenomyoma of the stomach.

We have described three cases of adenomyoma of the stomach. These benign lesions are found almost exclusively in the antrum or pylorus and are composed of combinations of ducts, glands, pancreatic tissue, and smooth muscle. Malignancy arising in adenomyomas is rare.

Aged↗
PubMed1983

Pulmonary endothelial dysfunction in the presence or absence of interstitial injury induced by intratracheally injected bleomycin in rabbits.

Previously, we reported that repeated subcutaneous administration of bleomycin (BLM) to rabbits produced functional and structural endothelial damage with no evidence of interstitial fibrosis. In the present study, rabbits received intratracheally a single injection of BLM (6 units/kg, n = 6: "low dose" or 11 units/kg, n = 4: "high dose"); 6 additional animals received intratracheally an injection of saline and served as controls. Four weeks after BLM administration, the low-dose group demonstrated significant reduction in the single-pass pulmonary removal of 14C-5-hydroxytryptamine (5-HT) (p less than 0.05; n = 4), whereas 3H-norepinephrine (NE) removal and 3H-benzoyl-phe-ala-pro (BPAP) substrate for lung angiotensin converting enzyme (ACE) metabolism in vivo, as well as lung and serum ACE activity in vitro remained at control levels. No morphologic or biochemical evidence of fibrosis was observed. In contrast, the high-dose BLM group exhibited significant reductions in 14C-5-HT and 3H-NE removal and 3H-BPAP metabolism in vivo, but no significant changes in lung or serum ACE activity in vitro. Furthermore, there was evidence of fibrosis, as revealed by a 59% increase in lung hydroxyproline content and by light microscopic examination of lung tissue. We conclude that intratracheal administration of BLM to rabbits can produce endothelial dysfunction in the presence or absence of interstitial injury.

Animals↗
PubMed1982

Diminutive polyps: histopathology, spatial distribution, and clinical significance.

This retrospective study of 329 diminutive colon polyps revealed that 49.2% of the polyps were neoplastic, whereas 49.9% were nonneoplastic. 36.8% of the polyps were metaplastic, and 0.9% had mixed metaplastic and adenomatous components. The metaplastic polyps had a predominance in the distal portion of the large bowel, with 76.9% being located distal from the splenic flexure and 52.9% being located in the rectosigmoid area. Neoplastic polyps were distributed throughout the colon, with 65.4% located from the splenic flexure distally and 34.5% located proximal to the splenic flexure. These findings suggest that a much larger proportion of diminutive polyps are neoplastic and therefore at risk to progress to carcinoma than previously considered.

Adult↗
PubMed1982

Behcet's disease with multiple sites of gastrointestinal involvement.

A 40-year-old man with Behcet's disease had esophageal, ileal, and colonic ulcerations complicated by gastrointestinal bleeding and perforation. Ileocolonic resection was followed by recurrence of intestinal ulcerations with peritonitis and death. Gastrointestinal Behcet's disease shows a wide range of sites of involvement and types of lesions. Specific therapy is lacking, and surgical resection of involved organs is complicated by a high recurrence rate.

Adult↗
PubMed1981

Recurrent purulent triaditis in a patient with congenital x-linked agammaglobulinemia.

A patient with congenital x-linked agammaglobulinemia, who had two separate episodes of an apparent bacterial purulent hepatic triaditis in the absence of any known local predisposing factors, is presented. These episodes may reflect the increased susceptibility of an immunodeficient patient to bacterial infections. This case demonstrates the need to consider hepatic involvement in the work-up of fevers of undetermined origin in immunodeficient patients, even in the absence of any radiologic or sonographic evidence of mechanical biliary tract obstruction.

Agammaglobulinemia↗
PubMed1978

Urine cytology findings in analgesic nephropathy.

Urine cytology screening for neoplasm led to the detection of 3 urothelial carcinomas and 1 severe urothelial dysplasia in 98 patients with analgesic-induced papillary necrosis. A further 18 patients had changes suggesting that they were at risk of incurring malignancy in the near future. Routine urine cytology is recommended in all cases of analgesic nephropathy.

Analgesics↗
PubMed1978

Origin of tubular complexes developing during induction of pancreatic adenocarcinoma by 7,12-dimethylbenz(a)anthracene.

Implantation of 7,12-dimethylbenz(a)anthracene (DMBA) into the pancreas of rats has been shown to induce adenocarcinoma. Complexes of tubules, which have the appearance of proliferated intralobular ducts, frequently appear during tumor development. These complexes were studied by light and electron microscopy to determine their method of formation. In addition, a tubular complex was reconstructed from serial sections to determine its three-dimensional configuration. Although tubular complexes have been thought by others to result from ductal proliferation, the following observation indicate that they originate from zymogen-granule-containing cells: a) there is a continuum of transitional stages between acini and tubules, b) most tubules decrease in size and are replaced by connective tissue (evidence of regression rather than proliferation), c) few mitotic figures are seen in tubular complexes, d) the tubules comprise many cells which have an abundance of rough endoplasmic reticulum, an organelle which is sparce in ducts, and e) the three-dimensional arrangement of tubules appears identical to the branching, anastomosing arrangement of zymogen-granule-containing cells of the normal rat pancreas. Control animals in which only sutures were placed in the pancreas showed minimal reaction. It is concluded that "acini" become recognized as tubules when loss of zymogen granules accompanies tumor induction by DMBA. Transformation of these cells could be erroneously interpreted as transformation from proliferating ducts.

9,10-Dimethyl-1,2-benzanthracene↗
PubMed1977

Immune complex glomerulonephritis associated with Klebsiella pneumoniae infection.

The kidneys of three patients who died of pneumonia due to Klebsiella pneumoniae were studied at autopsy by light and immunofluoerescent microscopy. One had no clinical evidence of renal disease; two had only microscopic hematuria and mild proteinuria. Light microscopy revealed focal proliferative glomerulonephritis in all three cases. Also in all three, immunofluorescent microscopy revealed a granular deposition of capsular polysaccharide antigens of Klebsiella pneumoniae in association with immunoglobulins and complement components in the mesangium and along the glomerular basement membrane. Furthermore, the glomerular bound immunoglobulins were eluted and demonstrated to contain antibodies specific to a capsular polysaccharide antigen of Klebsiella pneumoniae isolated from each patient. These findings may illustrate that the capsular polysaccharides of Klebsiella pneumoniae are antigenic, and that the immune complex deposition in the kidney during infection with this agent can be associated with renal morphological changes. Whether or not clinical evidence of nephritis occurs may depend on the characteristics of the infection and the host factors.

Aged↗
PubMed1976

Fine structure of pancreatic adenocarcinoma induced in rats by 7,12-dimethylbenz(a)anthracene.

We induced pancreatic adenocarcinomas in Long-Evans rats by placing crystals, 2-3 mg, of 7,12-dimethylbenz[a]anthracene (DMBA) in a 2- to 3-mm incision in the "head" of the pancreas approximately 1 cm from the duodenum. The incisions were closed with one or two silk sutures. The animals were killed 4-10 months after DMBA implantation, and nodules were removed and routinely prepared for light and/or electron microscopic study. Histologic organization varied from normal, through areas of tubule-like structures, to sheets of pleomorphic tumor cells. Electron microscopic study of tumor cells revealed large electron-lucent nuclei that frequently had irregular outlines and prominent nucleoli. The predominant feature of the cytoplasm was abundant rough endoplasmic reticulum. Zymogen granules were rare. Adjacent cells sometimes were jointed by an apical junctional complex to form a lumen into which projected irregular microvilli. A basal lamina sometimes occurred at the bases of the tumor cells. The fine structural similarity of these tumor cells to acinar cells was noted.

9,10-Dimethyl-1,2-benzanthracene↗
PubMed1975

Experimental induction of pancreatic adenocarcinoma in rats.

Adenocarcinomas of the pancreas were experimentally induced in rats after the implantation of 7,12-dimethylbenz[alpha]anthracene (DMBA). Rats were anesthetized with Nembutal, the pancreas was exposed, and a 2- to 3-mm incision was made in the "head" of the pancreas approximately 1 cm from the duodenum. Crystalline DMBA (2-3 mg) was implanted and the incision was closed with silk suture. Eight % of animals developed tumors in the pancreas from 119 to 363 days after implantation (mean, 194 days). Ten animals developed tumors in less than 180 days. The adenocarcinomas were invasive, metastasized, and had pronounced ductal cell characteristics. The light-microscopic morphology of these pancreatic tumors was presented.

9,10-Dimethyl-1,2-benzanthracene↗