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Fertility and Sterility Jun 1975A systematic search was made for components specific to the female reproductive tract in golden hamsters. Antisera produced in rabbits against saline homogenates of...
A systematic search was made for components specific to the female reproductive tract in golden hamsters. Antisera produced in rabbits against saline homogenates of hamster uteri (collected on the night of estrus) cross-reacted extensively with extracts of 12 other tissues in agar gel double-diffusion assays. Absorption of the antisera with small intestine, lung, and liver rendered the immune sera specific for uterine and oviductal antigens (within the limits of the sensitivity of the precipitin assays). Immunoelectrophoretic analysis resolved 12 uterine antigens, many of which were similar to components in several other tissues. Absorbed antisera specific for reproductive tract antigens formed one postalbumin arc with uterine and oviductal extracts in immunoelectrophoretic studies. No reactions were detected between specific antisera and five other organ extracts or plasma. An indirect immunofluorescent antibody technique was used to detect changes in the distribution of specific antigens in reproductive tracts of cycling, pregnant, and ovariectomized hamsters. The gamma-globulin fraction of anti-uterus sera (absorbed with small intestine, lung, and liver), shown to be specific for reproductive tract tissues in precipitin tests, was used to localize antigens. Appropriate controls indicated that the fluorescence observed was due to antigen-antibody interactions. During the cycle, specific antigens were usually confined to the ampullary lamina propria, except during estrus, when they were prominent in the lamina propria and luminal epithelium of the ampula. Specific antigens were never abundant in the isthmus of nonpregnant hamsters. On day 1 postcoitum, the components were found throughout the ampullary and isthmic regions. By day 2 postcoitum, ampullary antigens were usually confined to the lamina propria. The specific components were not prominent in the oviduct on day 3 postcoitum, but were conspicuous in both ampulla and isthmus on day 4. Specific antigens in the uterus were confined to endometrial glands in nonpregnant animals during proestrus, estrus, and (occasionally) metestrus. Diestrous uteri contained no specific antigens. During the first 2 days of pregnancy, antigens were not abundant and were usually confined to the glands and stroma. On days 3 and 4 of pregnancy the specific antigens were prominent in the endometrial glands and stroma and along the apical borders of some luminal epithelial cells. By day 5, these components were less conspicuous in all areas of the endometrium. Uteri of spayed animals receiving no hormones or estradiol alone lacked the specific antigens. However, progesterone (after estrogen priming) promoted the appearance of these components, and the distribution resembled that seen in uteri of 3- and 4-day pregnant animals.
Topics: Animals; Antibodies; Antibody Formation; Antigens; Castration; Cricetinae; Electrophoresis, Polyacrylamide Gel; Epitopes; Estrus; Female; Fluorescent Antibody Technique; Immunoelectrophoresis; Ovary; Posture; Precipitin Tests; Pregnancy; Pregnancy, Animal; Reproduction; Sexual Behavior, Animal; Uterus
PubMed: 48484
DOI: 10.1016/s0015-0282(16)41178-7 -
Gastroenterology May 2021Peribiliary glands (PBGs), clusters of epithelial cells residing in the submucosal compartment of extrahepatic bile ducts, have been suggested as biliary epithelial...
BACKGROUND & AIMS
Peribiliary glands (PBGs), clusters of epithelial cells residing in the submucosal compartment of extrahepatic bile ducts, have been suggested as biliary epithelial stem/progenitor cell niche; however, evidence to support this claim is limited because of a lack of PBG-specific markers. We therefore sought to identify PBG-specific markers to investigate the potential role of PBGs as stem/progenitor cell niches, as well as an origin of cancer.
METHODS
We examined the expression pattern of the Wnt target gene Axin2 in extrahepatic bile ducts. We then applied lineage tracing to investigate whether Axin2-expressing cells from PBGs contribute to biliary regeneration and carcinogenesis using Axin2-Cre mice.
RESULTS
Wnt signaling activation, marked by Axin2, was limited to PBGs located in the periampullary region. Lineage tracing showed that Axin2-expressing periampullary PBG cells are capable of self-renewal and supplying new biliary epithelial cells (BECs) to the luminal surface. Additionally, the expression pattern of Axin2 and the mature ductal cell marker CK19 were mutually exclusive in periampullary region, and fate tracing of CK19 luminal surface BECs showed gradual replacement by CK19 cells, further supporting the continuous replenishment of new BECs from PBGs to the luminal surface. We also found that Wnt signal enhancer R-spondin3 secreted from Myh11-expressing stromal cells, corresponding to human sphincter of Oddi, maintained the periampullary Wnt signal-activating niche. Notably, introduction of PTEN deletion into Axin2 PBG cells, but not CK19 luminal surface BECs, induced ampullary carcinoma whose development was suppressed by Wnt inhibitor.
CONCLUSION
A specific cell population receiving Wnt-activating signal in periampullary PBGs functions as biliary epithelial stem/progenitor cells and also the cellular origin of ampullary carcinoma.
Topics: Ampulla of Vater; Animals; Axin Protein; Bile Ducts, Extrahepatic; Carcinogenesis; Carcinoma; Cell Lineage; Cell Proliferation; Common Bile Duct Neoplasms; Epithelial Cells; Keratin-19; Mice; Mice, Inbred C57BL; Myosin Heavy Chains; PTEN Phosphohydrolase; Sphincter of Oddi; Stem Cells; Thrombospondins; Wnt Signaling Pathway
PubMed: 33465373
DOI: 10.1053/j.gastro.2021.01.028 -
Journal of Surgical Case Reports Feb 2011Benign pathologies demonstrated after a Whipple's resection (pancreatoduodenectomy) for pancreatic and peri-ampullary lesions are relatively uncommon. Here we report two...
Benign pathologies demonstrated after a Whipple's resection (pancreatoduodenectomy) for pancreatic and peri-ampullary lesions are relatively uncommon. Here we report two cases where a Whipple's procedure was undertaken for suspected pancreaticobiliary cancer and where the final histology revealed, in each case, a rare benign lesion. The first case confirmed a cholesterol polyp in the distal common bile duct whilst the second case revealed ampullary intramural ectopic gland hyperplasia. Although pre-operative imaging helps in differentiating some benign lesions from malignant lesions, rare benign pathology may still mimic malignant conditions leading to a Whipple's resection.
PubMed: 24950562
DOI: 10.1093/jscr/2011.2.7 -
Gut and Liver Sep 2010This is the Fourth Annual Meeting of the Society for Gastrointestinal Intervention, a multi-disciplinary group of practitioners committed to a minimally invasive...
This is the Fourth Annual Meeting of the Society for Gastrointestinal Intervention, a multi-disciplinary group of practitioners committed to a minimally invasive approach to both the diagnosis and treatment of digestive disorders. The key concepts are minimally invasive and multi-disciplinary which can be construed as practicing in parallel with occasional lines of procedural and clinical interaction or inter-disciplinary in which patients are acutely cared for by a team, with treatments tailored to the patient and not the discipline that touches the patient first. In reality, many of us exist in both worlds. Most universities and large clinics are structured in departments along traditional training lines. As such, Interventional Radiology is housed in the Radiology Department, Laparoscopic Surgery (and potentially NOTES), as a component of the General Surgery Division, and Therapeutic Endoscopy usually resides within a gastroenterology structural framework. These divisions have historically been kept separate by multiple forces: salaries and budgets usually reside in a larger division. As a group, the amount of practice devoted to GI disorders is variable (for instance, minimally invasive surgeons may approach the adrenal glands or lung lesions in some institutions and interventional radiologists often sample tissue in multiple areas outside the GI tract, and by virtue of access to the vascular tree, can stent, embolize, or TPA almost any area of the body), as well as inherent differences in our individual abilities to access organs. I have already mentioned that angiographic capabilities allow the interventional radiologist access to virtually every GI organ and those capabilities allow therapeutic options for bleeding, tumor embolization, stenting of stenotic lesions, and formation of intravascular shunts. As such, there is very limited interdisciplinary competition here although capsule endoscopy as well as double and single balloon enteroscopy have improved the endoscopist's diagnostic and potential therapeutic reach. However, many of these diagnostic triumphs for obscure or massive GI bleed are simply to tattoo lesions that require surgical removal by laparoscopic or traditional surgery. Cooperation. However, there are potential competitive areas in the treatment of GI vascular lesions also. Whereas endoscopic band ligation has supplanted EVS, splenic devascularization, and most shunting procedures for patients with esophageal varices, endoscopic techniques have had less long-term success with glue injection for gastric varices. Multiple randomized, prospective trials have suggested therapeutic primacy of TIPS with embolization of recalcitrant vessels as an option or back-up. Despite this, therapeutic endoscopists have learned valuable lesions from our IR colleagues and studies are underway using endoscopically injected coils in addition to cyanoacrylate in an attempt to improve acute and long-term bleeding control. Nor is there any major competition in the treatment of primary or metastatic liver tumors by chemoembolization, RF current, or other thermal modalities, although selected patients with single lesions or multiple lesions isolated to a single lobe may be better handled surgically if there is curative intent. Finally, there is little IR, and progressively less, surgical competition for the treatment of high-grade dysplasia or superficial malignancies in the setting of Barrett's esophagus which are adequately treated in most patients by mucosectomy, RF ablation, or cryotherapy but require direct mucosal visualization to direct this therapy. The same has proven true for many years for colorectal polyps, superficial gastric cancers, and ampullary adenomas that had historically all been treated with major surgical resections. Still, there are many patients with advanced lesions who are good operative candidates who should be approached with conventional or minimally invasive surgery with the intent of operative cure. Cooperative, not competitive. The potential for competition between disciplines comes in mundane situations and clinical settings that have historically been "owned" by a single discipline. On the one hand, placement of PEGS and PEJs, initially done endoscopically, can be done with equal facility and occasional failure, by endoscopists and interventional radiologists, reserving failed attempts for minimally invasive surgery. What resources are utilized with these three methods? Are there advantages to defining the mucosa of the gut lumen in all, or even a subset of patients? By way of contrast, acute cholecystectomy tubes in high surgical risk patients have usually been the domain of the radiologist, although I described transcystic duct gallbladder decompression endoscopically 2½ decades ago. With the advent of new devices delivered under EUS control, the gallbladder will now be readily accessible endoscopically. What does this mean both for the acutely ill patient without a window to approach their gallbladder radiologically? Will this play a bit part and a cooperative technique to expand our therapeutic armamentarium or will it become competitive therapeutically not only for IR but for minimally invasive surgeons? The same may be said for EUS's ability to inject genes, caustics, or chemo-therapeutic agents into organs adjacent to the lumen. What is the role of TNFerade injection into unresectable pancreatic cancers and the role of absolute alcohol or Taxitol to treat cystic neoplasms of the pancreas? The real issue of competition or cooperation between the disciplines comes when treating patients with unresectable and obstructing GI neoplasms, from my perspective. The latter may occur almost anywhere in the GI tract but, of course, are more commonly noted proximally (esophagus, stomach, duodenum) and distally (left colon) as well as proximal and distal biliary obstructions. Recognizing that the occasional mid-small bowel and many proximal colon lesions are better handled with an endoscopic approach because of loss of vector force and difficulty pushing a catheter through large diameter, acutely angulated lumens, all others are fair game from my perspective. To my knowledge, although there are studies demonstrating the superiority of SEMS over open or laparoscopic bypass for malignant gastric outlet obstruction insofar as return of gut function, hospitalization time, and resource utilization, there are no studies demonstrating the superiority of one discipline or another in the placement of SEMS. Nor have cost data emerged suggesting the superiority of one technique over another from a cost standpoint. Unless or until we have such studies, this suggests to me that institutional interest and expertise should play a major role in how these unfortunate patients have continuity of their GI tract re-established. The situation is a bit more complex in pancreaticobiliary malignancy. There are 2 prospective randomized trials (level 1 evidence) that suggest that patients with proximal strictures (Bismuth II-IV) in conjunction with bile duct and gallbladder cancer, respectively, may be more successfully stented percutaneously and certainly it is easier to deliver brachytherapy or PDT under protocol to these patients who have indwelling external drains. In contrast, there are no data, positive or negative, to suggest that PTBD is a preferable treatment for distal biliary malignant obstruction, and in most parts of the world, the endoscopic approach has supplanted the percutaneous one just as metal stents have replaced plastic prostheses to preclude recurrent bouts of stent dysfunction and need for additional ERCP. The question posed at the beginning of this syllabus contribution: Are we competitive or cooperative? The answer is obviously both but, hopefully, our choice of treatment should depend less on who touches the patient first and more on skill sets within an institution and what is the best treatment for this particular individual. The importance of the SGI is technical and informational cross-fertilization. If your university or clinic will not allow blurring of training barriers to put therapeutic endoscopists, minimally invasive surgeons, and interventional radiologists together as a department or institute, you can nevertheless work together as a team in the best interest of your patients.
PubMed: 21103287
DOI: 10.5009/gnl.2010.4.S1.S1 -
Fukuoka Igaku Zasshi = Hukuoka Acta... Jul 2003A 49-year-old man was hospitalized because of a 2-month history of purpura in his extremities and for back pain. Laboratory findings showed alkaline phosphatase to be...
A 49-year-old man was hospitalized because of a 2-month history of purpura in his extremities and for back pain. Laboratory findings showed alkaline phosphatase to be greatly elevated, and platelet counts and coagulation factor showed that the patient had disseminated intravascular coagulation (DIC). Compression fractures of the thoracic vertebrae were found on radiological examination. The histological findings from bone marrow showed metastasis of adenocarcinoma with signet-ring cells, although the primary site was unknown. To reduce tumor cells in number and improve DIC, 11 cycles of 5-Fluorouracil and leucovorin therapy were done, and the patient survived for 12 months. Autopsy showed a 0.8 cm diameter, poorly differentiated adenocarcinoma with the signet-ring cell type in the lamina propria of the Vater's ampulla. Many metastatic foci and micro tumor emboli were found in the lung and in bone marrow. The sections of the stomach, the gallbladder, urinary bladder, prostate, and thyroid gland showed no malignant cells. These findings suggest that the origin of the cancer may have been located in the Vater's ampulla. This is a rare case of an ampullary tumor of poorly differentiated adenocarcinoma with the signet-ring cell type, without jaundice but with multiple metastasis. 5-Fluorouracil and leucovorin were effective for increasing survival time and improving quality of life.
Topics: Ampulla of Vater; Antineoplastic Combined Chemotherapy Protocols; Bone Marrow Neoplasms; Carcinoma, Signet Ring Cell; Common Bile Duct Neoplasms; Disseminated Intravascular Coagulation; Fatal Outcome; Fluorouracil; Humans; Jaundice; Leucovorin; Lung Neoplasms; Male; Middle Aged; Neoplastic Cells, Circulating; Quality of Life
PubMed: 14509231
DOI: No ID Found -
Journal of Andrology 2003Recently, we reported that male accessory sex gland (ASG) secretions protect sperm genomic integrity by demonstrating that DNA damage was more extensive in sperm not...
Recently, we reported that male accessory sex gland (ASG) secretions protect sperm genomic integrity by demonstrating that DNA damage was more extensive in sperm not exposed to the secretions. The present study was conducted to find out if ASGs secrete the main antioxidant enzymes superoxide dismutase (SOD), glutathione peroxidase (GPx or GSH-Px), and catalase (CAT) and if the most abundant one, SOD, can protect those sperm that were not exposed to ASG secretions against NADPH-induced oxidative stress. Four experimental groups of male golden hamsters were used: intact animals with proven fertility, animals with all major ASGs removed (TX), animals that were bilaterally vasectomized, and sham-operated controls. SOD, CAT, and GPx activities were measured in secretions from all 5 ASGs and sperm-free uterine flushing from virgin females and those mated with the experimental males. The alkaline comet assay was used to analyze DNA integrity of the TX group sperm after incubation in a medium containing 50 U/mL of SOD along with 0 to 20 mmol/L NADPH. The main antioxidant enzyme in ASGs was SOD from coagulating glands (P <.05) and GPx together with CAT from ampullary glands (P <.05). Uterine flushing of ejaculates that contained ASG secretions had more SOD and CAT activities than those with epididymal secretions alone (P <.05 and P <.001, respectively), whereas activity of GPx was the same (P >.05). Addition of SOD in vitro dose dependently decreased the incidence of single-strand DNA damage in sperm not exposed to ASG secretions incubated in the presence of 0 to 20 mmol/L NADPH (P <.001). These results indicated that, in terms of abundance, SOD was the main antioxidant enzyme secreted by male ASGs, whereas CAT was the second one. The GPx activity came from both epididymis and ASGs. We conclude that ASG secretions play a significant role in protecting sperm against oxidative stress.
Topics: Alkalies; Animals; Antioxidants; Catalase; Copulation; Cricetinae; DNA Damage; DNA, Single-Stranded; Female; Genitalia, Male; Glutathione Peroxidase; Hydrogen-Ion Concentration; Male; Mesocricetus; Oxidative Stress; Semen; Spermatozoa; Superoxide Dismutase; Therapeutic Irrigation; Uterus
PubMed: 12954661
DOI: 10.1002/j.1939-4640.2003.tb02730.x -
The Turkish Journal of Gastroenterology... Sep 2008As with most endocrine tumors, the malignant potential depends on evidence of local or distant invasion (metastasis), so it is important to differentiate...
As with most endocrine tumors, the malignant potential depends on evidence of local or distant invasion (metastasis), so it is important to differentiate synchronous/metachronous endocrine tumors from their metastases. A 90-year-old man was operated due to tumor of the ampulla of Vater. As the surgical specimen was examined macroscopically, a second tumor focus, measuring 1 cm in diameter, was detected at the duodenum. There were no clinical syndromes due to hormone hypersecretion. Microscopically, the ampullary tumor had trabecular and rosette-like patterns, with many necrotic areas. It had invaded the muscularis mucosa at the duodenal wall. The latter duodenal tumor was located in the submucosa and had distinct borders. This tumor consisted of trabecular structures with stroma rich in lymphoid aggregates. Immunohistochemistry revealed positivity for synaptophysin and gastrin and negativity for somatostatin. In addition, the whole antral portion of the Whipple resection material showed diffuse parietal cell hyperplasia. The tumors were diagnosed as well-differentiated endocrine carcinoma in the ampulla of Vater according to the WHO classification 2000, a gastrin-producing well-differentiated endocrine tumor in the first portion of the duodenum without regional lymph node metastases, and a diffuse parietal cell hyperplasia at the antral portion of the stomach. In conclusion, clinical findings and the postoperative diagnosis suggest that this patient had primary synchronous neuroendocrine tumors of the small intestine.
Topics: Aged, 80 and over; Ampulla of Vater; Diagnosis, Differential; Endocrine Gland Neoplasms; Fatal Outcome; Humans; Intestinal Neoplasms; Intestine, Small; Male; Neoplasms, Multiple Primary
PubMed: 19115157
DOI: No ID Found -
Journal of Anatomy May 2003The urethra is the main place of entry for sexually transmitted pathogens. However, there is little literature on the morphology of the urogenital system, principally...
The urethra is the main place of entry for sexually transmitted pathogens. However, there is little literature on the morphology of the urogenital system, principally the urethra and ducts of the sex accessory glands. The Mongolian gerbil is an insectivorous, herbivorous and monogamous rodent with nocturnal habits; it has been used successfully as a laboratory animal since the 1960s. Therefore, the objective of the present paper was to describe the structure and ultrastructure of the urethra and its relations to the ducts of the accessory sex glands of the Mongolian gerbil (Meriones unguiculatus), contributing to the understanding of the reproductive biology of the rodent and aiming to provide data for future experimental studies. Conventional techniques of light and scanning electron microscopy were utilized. The urethra and ducts of the accessory sex glands are similar to those of the albino rat and the mouse. However, there is variation in drainage type among accessory sex glands for the inner urethra. The ducts of the seminal vesicle, the ductus deferens, drain their contents independently into the ampullary duct that opens in the urethra. The ducts of the prostate, coagulating and bulbourethral glands drain their contents independently into the urethra.
Topics: Animals; Bulbourethral Glands; Genitalia, Male; Gerbillinae; Male; Microscopy, Electron, Scanning; Penis; Prostate; Urethra; Vas Deferens
PubMed: 12739620
DOI: 10.1046/j.1469-7580.2003.00181.x -
Archives of Histology and Cytology Oct 2001The three-dimensional distribution of the biliary tract in the rat was studied by scanning electron microscopy of biliary casts. The casts were prepared by a retrograde...
The three-dimensional distribution of the biliary tract in the rat was studied by scanning electron microscopy of biliary casts. The casts were prepared by a retrograde infusion of a low viscosity or monomeric methacrylate resin mixture into the common bile duct. No resin flow from the bile canaliculi to sinusoidal capillaries was ever noted. Bile canaliculi formed intricate meshworks and drained via the Hering's canals into the bile ductules. The bile canalicular meshworks of adjacent lobules intercommunicated with each other. The bile ductules formed a marked periportal plexus around the portal vein branch, and drained into the intrahepatic bile duct running along the portal vein branch. The junctional zone of the Hering's canal and bile ductule usually showed an ampullary dilation. When the Hering's canal directly drained into a thick bile ductule or into a periportal plexus of bile ductules, such an ampullary dilation at the origin of the bile ductule was never replicated. The extrahepatic bile duct protruded many crypt-like projections which presumably corresponded to parietal glands. It is suggested that the periportal plexus of bile ductules may store the bile as a substitute for the gallbladder.
Topics: Animals; Bile Canaliculi; Bile Ducts, Extrahepatic; Bile Ducts, Intrahepatic; Biliary Tract; Male; Methylmethacrylate; Microscopy, Electron, Scanning; Rats; Rats, Wistar
PubMed: 11757912
DOI: 10.1679/aohc.64.439 -
Japanese Journal of Cancer Research :... Dec 1988A monoclonal antibody, KM10 (IgG1) was produced by fusing spleen cells from a human gastric cancer cell (MKN45)-primed BALB/c mouse with the murine myeloma cell line...
A monoclonal antibody, KM10 (IgG1) was produced by fusing spleen cells from a human gastric cancer cell (MKN45)-primed BALB/c mouse with the murine myeloma cell line X63-Ag8-653. The antibody reacted strongly with the plasma membrane of human gastrointestinal carcinoma. Sections of the malignant and benign tissues were tested with immunoperoxidase. All of 10 (100%) large intestinal cancers, 26 of 31 (84%) gastric cancers, 5 of 7 (71%) pancreatic cancers and all of 3 (100%) ampullary cancers reacted positively. Moderate or weak reactivity was observed with normal human tissues, hepatoma and carcinomas of mammary, thyroid and adrenal glands. According to a study of the distribution of 125I-labeled KM10 in nude mice bearing human gastric cancer, KM10 selectively localized in tumor tissue rather than normal tissue. Whole body autoradiography also supported such a selective distribution. Destruction of antigenic properties by pronase digestion demonstrated its protein nature and by Western blot analysis, it was identified as a protein with an Mr of 180-200 kd. KM10-adriamycin (ADM) conjugate was prepared via an oxidized dextran bridge and this immunoconjugate retained the binding activity against human gastric cancer. MKN45 cells were inoculated subcutaneously into athymic mice and intravenous treatment was begun when the tumor became measurable. A dose-dependent antitumor activity was observed in vivo with KM10-ADM conjugate, while this conjugate was less toxic than free ADM.
Topics: Animals; Antibodies, Monoclonal; Antigens, Neoplasm; Blotting, Western; Carcinoembryonic Antigen; Doxorubicin; Electrophoresis, Polyacrylamide Gel; Gastrointestinal Neoplasms; Humans; Immunohistochemistry; Immunotoxins; Iodine Radioisotopes; Mice; Mice, Inbred BALB C
PubMed: 3148606
DOI: 10.1111/j.1349-7006.1988.tb01566.x