Embryonic cuticle from artemia cyst shell displays amyloid-like characteristics and nontoxicity after oral consumption.

Artemia cysts are the essential food product for industrial larviculture of fishes. The cyst shell protects the artemia embryo from mechanical damage, ultraviolet light, excessive water loss, thermal variation and anoxia condition. However, the underlying mechanism of such environmental protection is largely unclear. The embryonic cuticle of cyst shell mainly constitutes chitin and proteins. Absence of cyst shell proteins compromises embryo survival. In literature, there are few examples of functional amyloids where proteins adapt amyloid-like structures and act as protective covering. We hypothesized that the proteins from the embryonic cuticle of artemia cyst shell may have amyloid-like properties. Using FTIR and CD analysis, we found that proteins in embryonic cuticle have high ß-sheet secondary structures. Embryonic cuticles displayed high Congo red binding affinity and stained samples showed apple-green birefringence under polarized light, confirming the presence of amyloid-like structures. Amyloid structures have a tendency to propagate and cause amyloidosis. However, feeding of amyloid rich embryonic cuticles to zebrafish did not show any signs of discomfort or morbidity and amyloid deposition. Taken together, the study reveals that amyloid-like structures are present in embryonic cuticle of artemia cyst and their consumption does not induce amyloidosis in zebrafish.

[Uterine serosal inclusion cysts in the dog - case report and literature review of canine uterine cysts]. / Serosazysten am Uterus der Hündin ­ Fallbericht und Literaturübersicht zu kaninen Uteruszysten.

In bitches, uterine cysts are usually associated with pathological conditions. Serosal inclusion cysts of the uterus represent an exception to this rule. These thin-walled cysts develop on the uterine surface and occur either as single or multiple cysts. The cysts lack endocrine activity and usually do not cause clinical symptoms. Their occurrence shows no association to the estrus cycle. Serosal inclusion cysts are mainly found in older multiparous bitches and large breeds are more often affected. Diagnosis of serosal inclusion cysts may be achieved by transabdominal sonography. Differentiation between uterine and ovarian serosal inclusion cysts is possibly challenging as serosal inclusion cysts are often located in the area of the tip of the uterine horn. This report presents the case of a breeding bitch with multiple uterine serosal inclusion cysts detected during caesarean section. The concentrations of estradiol 17ß and progesterone in the cyst fluid corresponded to the blood concentrations of these hormones in a bitch during parturition. The concentrations of total calcium, zinc, copper, and iron in the cyst fluid were below the reference values in canine blood whereas the concentrations of magnesium, phosphorus, sodium, and potassium in the cyst fluid were comparable to pertaining blood levels.

Structural basis for the dominant or recessive character of GLIALCAM mutations found in leukodystrophies.

Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a type of leukodystrophy characterized by white matter edema, and it is caused mainly by recessive mutations in MLC1 and GLIALCAM genes. These variants are called MLC1 and MLC2A with both types of patients sharing the same clinical phenotype. In addition, dominant mutations in GLIALCAM have also been identified in a subtype of MLC patients with a remitting phenotype. This variant has been named MLC2B. GLIALCAM encodes for an adhesion protein containing two immunoglobulin (Ig) domains and it is needed for MLC1 targeting to astrocyte-astrocyte junctions. Most mutations identified in GLIALCAM abolish GlialCAM targeting to junctions. However, it is unclear why some mutations behave as recessive or dominant. Here, we used a combination of biochemistry methods with a new developed anti-GlialCAM nanobody, double-mutants and cysteine cross-links experiments, together with computer docking, to create a structural model of GlialCAM homo-interactions. Using this model, we suggest that dominant mutations affect different GlialCAM-GlialCAM interacting surfaces in the first Ig domain, which can occur between GlialCAM molecules present in the same cell (cis) or present in neighbouring cells (trans). Our results provide a framework that can be used to understand the molecular basis of pathogenesis of all identified GLIALCAM mutations.

Cyst Fluid From Cystic, Malignant Brain Tumors: A Reservoir of Nutrients, Including Growth Factor-Like Nutrients, for Tumor Cells.

BACKGROUND: Brain tumors may have cysts, whose content of nutrients could influence tumor cell microenvironment and growth. OBJECTIVE: To measure nutrients in cyst fluid from glioblastoma multiforme (GBM) and metastatic brain tumors. METHODS: Quantification of nutrients in cyst fluid from 12 to 18 GBMs and 4 to 10 metastatic brain tumors. RESULTS: GBM cysts contained glucose at 2.2 mmol/L (median value; range <0.8-3.5) and glutamine at 1.04 mmol/L (0.17-4.2). Lactate was 7.1 mmol/L (2.4-12.5) and correlated inversely with glucose level (r = -0.77; P < .001). Amino acids, including glutamate, varied greatly, but median values were similar to previously published serum values. Ammonia was 75 µmol/L (11-241). B vitamins were present at previously published serum values, and riboflavin, nicotinamide, pyridoxal 5΄-phosphate, and cobalamin were higher in cyst fluid than in cerebrospinal fluid. Inorganic phosphate was 1.25 mmol/L (0.34-3.44), which was >3 times higher than in ventricular cerebrospinal fluid: 0.35 mmol/L (0.22-0.66; P < .001). Tricarboxylic acid cycle intermediates were in the low micromolar range, except for citrate, which was 240 µmol/L (140-590). In cystic metastatic malignant melanomas and lung tumors values were similar to those in GBMs. CONCLUSION: Tumor cysts may be a nutrient reservoir for brain tumors, securing tumor energy metabolism and synthesis of cell constituents. Serum is one likely source of cyst fluid nutrients. Nutrient levels in tumor cyst fluid are highly variable, which could differentially stimulate tumor growth. Cyst fluid glutamate, lactate, and phosphate may act as tumor growth factors; these compounds have previously been shown to stimulate tumor growth at concentrations found in tumor cyst fluid.

Differentiating Simple Hepatic Cysts from Mucinous Cystic Neoplasms: Radiological Features, Cyst Fluid Tumour Marker Analysis and Multidisciplinary Team Outcomes.

BACKGROUND: Differentiating hepatic mucinous cystic neoplasms (MCNs) from simple hepatic cysts (SCs) preoperatively is a challenging task. Our aim was to determine whether radiological features on ultrasound scan (USS), CT or MRI, cyst fluid tumour markers, or multidisciplinary team (MDT) outcomes could differentiate MCN from SC. METHODS: A retrospective review of radiological features, cyst fluid tumour marker levels and MDT outcomes in 52 patients was performed. RESULTS: There were 13 patients with MCN, 38 with SC and one ciliated foregut cyst. MCNs were more often solitary (p = 0.006). Although no other individual radiological characteristic on USS, CT or MRI was predictive of MCN, MDT outcomes stating that a cyst was complex in nature were highly predictive (p = 0.0007). Cyst fluid carbohydrate antigen 19-9, carcino-embryonic antigen and cancer antigen 125 were unable to differentiate MCN from SC (p = 0.45, p = 0.49, and p = 0.73, respectively). CONCLUSIONS: MDT outcomes are of greatest value when trying to differentiate MCN from SC, as well as having a solitary cyst on imaging. Conventional cyst fluid tumour markers are unhelpful. All suspicious cystic liver lesions should be discussed pre-operatively by a hepatobiliary MDT to determine the most appropriate surgical approach.

[Clear cell papillary renal cell carcinoma: a distinct low-grade renal tumour].

OBJECTIVE: To study the clinicopathologic features of clear cell papillary renal cell carcinoma (CCPRCC). METHODS: The clinical, morphologic and immunohistochemical characteristics of 6 cases of CCPRCC were reviewed, with analysis of follow-up data. RESULTS: There were altogether 3 men and 3 women. The mean age of patients was 56 years. The size of tumors ranged from 1.0 to 4.5 cm in greatest dimension. They had solid or solid-cystic cut surface. Histologically, the tumors were encapsulated and showed several morphologic patterns, with tubules, papillae, acini, interconnecting ribbons and macro/microcysts lined by single layer of cells with clear or small amount of eosinophilic cytoplasm and low-grade nuclei (corresponding to Fuhrman grade 1 or 2). Mitotic figures were rarely seen. Characteristically, there was linear arrangement of the nuclei away from the basement membrane, conferring an appearance similar to that of endometrial glands in early secretory phase. Tubules and cysts contained serosanguineous fluid or colloid-like secretion were identified. No foamy histiocytes, psammomatous calcifications or hemosiderin was present in the papillary areas. Two of the tumors showed focal or extensive angioleiomyoma/leiomyoma-like components. No coagulative necrosis, sarcomatoid dedifferentiation, nor microscopic vascular invasion was observed. Immunohistochemically, all tumors showed strong co-expression of CK7 and CA9 (with characteristic "goblet" staining pattern). The staining for EMA, CK (AE1/AE3), vimentin, CK8, CK18, CK19 and PAX-8 were also positive in all cases. Ki-67 was expressed in less than or about 5% of the tumor cell nuclei. The staining for CD10, P504S, CD117, TFE3 and TFEB was negative. Follow-up data were available in all patients, with mean duration of 14 months (range = 7 to 27 months). All of the patients were disease-free after operation. CONCLUSION: CCPRCC is a special type of low-grade renal neoplasm with characteristic histopathologic and immunohistochemical features. It needs to be distinguished from clear cell renal cell carcinoma or papillary renal cell carcinoma.

Differential antigenic protein recovery from Taenia solium cyst tissues using several detergents.

Human and porcine cysticercosis is caused by the larval stage of the flatworm Taenia solium (Cestoda). The protein extracts of T. solium cysts are complex mixtures including cyst's and host proteins. Little is known about the influence of using different detergents in the efficiency of solubilization-extraction of these proteins, including relevant antigens. Here, we describe the use of CHAPS, ASB-14 and Triton X-100, alone or in combination in the extraction buffers, as a strategy to notably increase the recovery of proteins that are usually left aside in insoluble fractions of cysts. Using buffer with CHAPS alone, 315 protein spots were detected through 2D-PAGE. A total of 255 and 258 spots were detected using buffers with Triton X-100 or ASB-14, respectively. More protein spots were detected when detergents were combined, i.e., 2% CHAPS, 1% Triton X-100 and 1% ASB-14 allowed detection of up to 368 spots. Our results indicated that insoluble fractions of T. solium cysts were rich in antigens, including several glycoproteins that were sensitive to metaperiodate treatment. Host proteins, a common component in protein extracts of cysts, were present in larger amounts in soluble than insoluble fractions of cysts proteins. Finally, antigens present in the insoluble fraction were more appropriate as a source of antigens for diagnostic procedures.

Ciliated hepatic foregut cyst: a report of 6 cases and a review of the English literature.

BACKGROUND: Ciliated hepatic foregut cyst (CHFC) is a rare cystic lesion most commonly identified in segment 4 of the liver that arises from the embryonic foregut. The classic histologic pattern is comprised of 4 distinct layers (inner ciliated epithelial lining, smooth muscle, loose connective tissue, fibrous capsule). Although rare, cases of metaplastic and malignant epithelial lining have been described in CHFC. METHODS: We report 6 additional cases of CHFC, one of which had gastric metaplasia of the cyst lining, and review all reported cases of CHFC in the English literature. We describe the clinicopathologic analysis of 6 cases, with selective immunohistochemical analysis on 1 case with gastric metaplasia. RESULTS: Cases occurred in 4 women and 2 men (average age 55 years, range 42 to 67 years). Cysts ranged in size from 0.7 to 17 cm (average 7.2 cm) and were grossly tan-pink to white with blood-filled contents. The majority were located in segment 4 of the liver, however 2 were located in the porta hepatis. Tumor serologies (CA19-9 and/or CEA) were performed in 3 cases; 1 case demonstrated elevated CA19-9, and 2 cases had laboratory values within normal limits. All cases showed the classic histologic findings, however one case additionally had extensive gastric metaplasia. CONCLUSIONS: In conclusion, CHFC is a rare diagnostic entity that should be considered in the differential diagnosis for cystic hepatic lesions, particularly those located in segment 4 of the liver. Metaplasia and squamous carcinoma can occur, therefore complete surgical excision is the recommended treatment.

Collagenous nodule mixed simple cyst and hemangioma coexistence in the liver.

A 20-year-old female patient presented with two masses located in the left liver. In this patient, a computed tomography (CT) scan revealed a hypodense mass and a second well-defined mass with a calcified nodule in the left hepatic lobe. No enhancements were apparent in or around the masses. A laparotomy was performed due to the patient's symptoms, namely, the atypical CT findings and a risk of rupture of the subcapsular lesion. The operation revealed two masses in the left hepatic lobe and a left liver resection was subsequently performed. One of the masses involved segment III and the other mass was located in segment IV. The histopathologic findings supported a diagnosis of collagenous nodule mixed simple cyst and hemangioma. A diagnosis of collagenous nodule mixed simple hepatic cyst is extremely rare and radiologically mimics a teratoma, hepatolithiasis, parasitic cyst, or hemangioma. Although hepatic hemangiomas are the most common benign tumors found in the liver, the present case showed atypical radiographic features.

Fluorescence decay of dyed protozoa: differences between stressed and non-stressed cysts.

Several series of tests have shown that fresh, intact samples of Giardia duodenalis and Cryptosporidium parvum (oo)cysts are not marked by fluorescent probes such as carboxyfluorcein-succinimidyl-diacetate-ester (CFDA-SE), C12-resazurin and SYTOX® Green, probably because of their robust cell walls. These dyes fail to indicate the viability of such protozoa and allow negative responses to be recorded from living and infectious samples. Cryptosporidium parvum showed stronger isolation from chemicals, with living oocysts remaining unstained by the probe for up to 90 days after extraction. However, in further fluorescence decay (FD) experiments run with G. duodenalis samples stained using CFDA-SE (comprising living, non-stressed but aged cysts, heat-killed samples and UV-C-stressed samples) each showed a different FD decay profile, here studied in seven series of tests of five replicates each. The FD profiles were fitted by double-exponential decay kinetics, with the decay constant k2 being five times higher than k1. This FD procedure is fast and can be easily reproduced in 10 steps, taking ~ 1 h of laboratory work for already purified samples.

Non-Tumor Cystic Lesions of the Adrenal Gland.

UNLABELLED: Adrenal cystic lesions are uncommon but due to the improved radiologic imaging techniques their appearance seems to increase. MATERIAL AND METHODS: We analyzed the clinical and radiological findings of 10 patients with adrenal cysts and the pathological features of the operative material. Standard dissection procedure and paraffin embedded tissue sections were made, stained by HE and immunohistochemically with CD34, CD 31, Factor 8, Podoplanin, CKWS and AE1/AE3 RESULTS: The mean age of the patients was 40.6 years; female to male ratio was 2.3:1. All the cysts were diagnosed as cystic lesions radiologically except one. The most present clinical symptom was abdominal pain. The diameter of the cysts measured from 2 to 7 cm. Four of the cysts were diagnosed as pseudocysts and six as endothelial. Six cysts were lined by CD34(+) and CD31(+) cells, four were lined by Factor 8(+) and podoplanin(+) cells and four had no lining. CONCLUSION: Endothelial cysts were more common cysts in our study and the immunohistochemical results suggested common vascular origin to all endothelial cysts and supported additional separation of angiomatous and lymphangiomathous adrenal vascular cysts.

Cutaneous ciliated cyst of the scalp: a case report of a cutaneous ciliated eccrine cyst and a brief review of the literature.

Cutaneous ciliated cysts (CCC) are rare benign cysts known to occur in the lower extremities of females of reproductive age. Currently, there are 2 theories that attempt to explain the histogenesis of this rare entity. The theory of Mullerian heterotopia provides a plausible histogenetic explanation for the vast majority of CCC. A proposed alternative theory is the ciliated metaplasia of eccrine glands. We believe that previously reported cases of CCC include 2 distinct entities. We report, herein, the first case reported in the literature of a cutaneous ciliated eccrine cyst occurring on the scalp.

Rare adult gastric duplication cyst mimicking a gastrointestinal stromal tumor.

Gastric duplication cyst is a very rare gastrointestinal tract malformation that accounts for 2%-4% of alimentary tract duplications. Most cases are diagnosed within the first year of life, following presentation of abdominal pain, vomiting, and weight loss and clinical discovery of an abdominal palpable mass. This case report describes a very uncommon symptomatic gastric duplication cyst diagnosed for the first time in adulthood. Only a few other case reports of similar condition exist, and all were identified by endosonography. The current case involves a 52-year-old male who presented with a one-month history of progressive iron deficiency anemia without overt gastrointestinal bleeding. The patient underwent esophagogastroduodenoscopy, which revealed a 2.0 cm pinkish subepithelial lesion, suspected to be a gastrointestinal stromal tumor (GIST) and source of gastrointestinal bleeding. The endosonography showed inhomogeneous hypoechoic lesions with focal anechoic areas arising from a second and third layer of the gastric wall. Differential diagnoses of GIST, neuroendocrine tumor, or pancreatic heterotopia were made. The lesion was removed using an endoscopic submucosal resection technique. Histopathology revealed an erosive gastric mass composed of a complex structure of dilated gastric glands surrounded by fibro-muscular tissue, fibroblasts, and smooth muscle bundles, which led to the diagnosis of gastric duplication.

Lactate dehydrogenase isoenzyme patterns in auricular pseudocyst fluid.

OBJECTIVE: We investigated lactate dehydrogenase isoenzyme patterns in the cyst fluid of auricular pseudocysts and autogenous blood, to assist the diagnosis of auricular pseudocyst. METHODS: Twenty patients with auricular pseudocysts participated in this study conducted in Kaohsiung Medical University Hospital between February 2007 and June 2010. Patterns of lactate dehydrogenase in cyst fluid and autogenous blood were analysed. RESULTS: Levels of lactate dehydrogenase 1 and 2 were lower in auricular pseudocysts than in autogenous blood, whereas levels of lactate dehydrogenase 4 and 5 were higher; this difference was statistically significant (p < 0.001). CONCLUSION: Lactate dehydrogenase isoenzyme patterns in auricular pseudocyst fluid indicated higher percentage distributions of lactate dehydrogenase 4 and 5 and lower percentage distributions of lactate dehydrogenase 1 and 2. An effective laboratory method of evaluating the different lactate dehydrogenase isoenzyme components was developed; this method may improve the accuracy of auricular pseudocyst diagnosis.

Impact of protein content on proton diffusibility in intracranial cysts.

PURPOSE: The physical background of diffusion phenomena in intracranial cysts is unclear in some cases. To evaluate a potential dependency of proton diffusion on the concentration of proteins in cystic lesions we investigated the correlation of diffusion weighted imaging (DWI) and magnetization transfer ratio imaging (MTR) in intracranial cystic pathologies in vivo and in vitro with protein solutions. MATERIALS AND METHODS: 21 patients (14 male/7 female) with intracranial cystic lesions underwent preoperative MRI (1.5T) including MTR and DWI sequences. For comparison a series of samples with declining concentration of albumin was investigated in vitro with a 7T animal scanner. RESULTS: In the patients examination mean ADC values were 1.93×10-3mm2/sec and mean MTR values were 0.2. Mean ADC value of the albumin solutions was 0.22× 0-3mm2/sec and mean MTR was 0.12. ADC and MTR values showed a strong negative correlation in the patients (Spearman's rank correlation rs=-0.80, p<0.01) and a very strong negative correlation in the in vitro examinations (rs=-1.0, p<0.01). CONCLUSION: The strong negative correlation of ADC and MTR values suggest a strong influence of proteins on proton diffusion in intracranial cysts. The phenomena can be explained by macromolecules that bind nearby protons in their vicinity.

Clinicopathological features and surgical treatment of intratarsal keratinous cysts.

PURPOSE: To explore the clinical and histopathologic features and surgical outcome of intratarsal keratinous cyst (IKC). METHODS: The clinical findings, histopathologic evaluations, and immunohistochemical studies in 15 cases of IKC were investigated, retrospectively. RESULTS: Fifteen patients with an average age of 44.7 years had noninflamed eyelid cysts sized 1-6 mm in diameter. The cysts appeared as solid, whitish opalescent or yellow-white, mildly elevated lesions beneath the palpebral conjunctiva. The cysts embedded in the tarsus were completely excised with a portion of the adjacent tarsus by a surgical procedure through palpebral conjunctival approach. Histopathologic evaluations revealed stratified squamous epithelium linings and keratin contents, which were not identical to the common epidermal or epidermoid cysts. The results were negative for Alcian blue and periodic acid-Schiff staining and showed positive correlation to the immunoreaction for epithelial membrane antigen. No recurrence occurred in all patients who had their lesions removed completely. CONCLUSIONS: Our study revealed the clinical and pathological characteristics of IKC, including the absence of inflammatory sign, lesion partially embedded in the tarsus and protruding beneath the conjunctiva with the intracystic keratinous contents, stratified squamous epithelium linings, string-like keratin contents from the histopathology sections, and strongly immunoreactivity to antibodies against epithelial membrane antigen. A complete excision of cysts with adjacent tarsectomy by transconjunctival approach was proved to be an effective treatment for prevention of recurrence.

Ciliated hepatic foregut cyst: two further cases with an immunohistochemical analysis.

The objective of the present study is to report two cases of a rare entity, which is being increasingly recognized in recent years. A 35-year-old woman and a 33-year old man were incidentally discovered to have bilocular cystic hepatic masses affecting segment IV. In both cases the cystic mass was excised and the histopathological analysis revealed an inner lining of the cyst wall with a pseudostratified epithelium showing prominent cilia. The cyst wall contained some muscular fibers but no cartilage or other tissue types and diagnosis was ciliated hepatic cyst. Both patients recovered uneventfully after surgery and are well and disease free. Ciliated hepatic cysts are rare cystic hepatic masses derived from remnants of the embryonal foregut that are embedded inside the hepatic bud during embryological development. Fewer than 100 cases of this tumor have been reported in the world literature, many of them in Japan, and most cases have behaved in a benign fashion, although there are at least three reported cases of malignancy within the cyst wall to a squamous cell carcinoma. We herein report two further cases of this entity, highlight the diagnostic usefulness of immunohistochemistry and comment on the possible therapeutic alternatives.