KIR2DL3 and the KIR ligand groups HLA-A-Bw4 and HLA-C2 predict the outcome of hepatitis B virus infection.

Killer immunoglobulin-like receptors (KIRs) regulate the activation of natural killer cells through their interaction with human leucocyte antigens (HLA). KIR and HLA loci are highly polymorphic, and certain HLA-KIR combinations have been found to protect against viral infections. In this study, we analysed whether the KIR/HLA repertoire may influence the course of hepatitis B virus (HBV) infection. Fifty-seven subjects with chronic hepatitis B (CHB), 44 subjects with resolved HBV infection and 60 healthy uninfected controls (HC) were genotyped for KIR and their HLA ligands. The frequency of the HLA-A-Bw4 ligand group was higher in CHB (58%) than subjects with resolved infection (23%) (crude OR, 4.67; P<.001) and HC (10%) (crude OR, 12.38; P<.001). Similar results were obtained for the HLA-C2 ligand group, more frequent in CHB (84%), than subjects with resolved infection (70%) (crude OR, 2.24; P<.10) and HC (60%) (crude OR, 3.56; P<.01). Conversely, the frequency of KIR2DL3 was lower in CHB (81%) than in subjects with resolved infection (98%) (crude OR, 0.10; P<.05). These results suggest a detrimental role of HLA-A-Bw4 and HLA-C2 groups, which are associated with the development of CHB, and a protective role of KIR2DL3. A stepwise variable selection procedure, based on multiple logistic regression analysis, identified these three predictive variables as the most relevant, featuring high specificity (90.9%) and positive predictive value (87.5%) for the development of CHB. Our results suggest that a combination of KIR/HLA gene/alleles is able to predict the outcome of HBV infection.

Clinical course and management of acute and chronic viral hepatitis during pregnancy.

Pregnancy is a para-physiologic condition, which usually evolves without any complications in the majority of women, even if in some circumstances moderate or severe clinical problems can also occur. Among complications occurring during the second and the third trimester very important are those considered as concurrent to pregnancy such as hyperemesis gravidarum, intrahepatic cholestasis of pregnancy, HELLP syndrome and acute fatty liver of pregnancy. The liver diseases concurrent to pregnancy typically occur at specific times during the gestation and they may lead to significant maternal and foetal morbidity and mortality. Commonly, delivery of the foetus, even preterm, usually terminates the progression of these disorders. All chronic liver diseases, such as chronic viral hepatitis, autoimmune hepatitis, Wilson's disease, and cirrhosis of different aetiologies may cause liver damage, independently from pregnancy. In this review we will also comment the clinical implications of pregnancies occurring in women who received a orthotopic liver transplantation (OLT) Therefore, the management of immunosuppressive therapy before and after the delivery in women who received liver transplant is becoming a relevant clinical issue. Finally, we will focus on acute and chronic viral hepatitis occurring during pregnancy, on management of advanced liver disease and we will review the literature on the challenging issue regarding pregnancy and OLT.

Incisional hernia surgery: report on 283 cases.

BACKGROUND AND OBJECTIVES: Despite the improvement of the surgical technique and several experiences reported in literature about prosthetic incisional hernioplasty, the prevalence rate of recurrence and of the classic complications has not changed over the years. We analyze our caseload, establishing some technical cornerstones in order to reduce their occurrence. PATIENTS AND METHODS: 283 patients underwent incisional hernioplasty in our Department of Surgery in the decade 1999-2008. They were retrospectively divided into four groups (A-D) according to the surgical technique adopted for a comparative analysis: A, 37 primary direct closure; B, 207 Rives-Stoppa procedures; C, 9 Chevrel procedures; D, 30 intraperitoneal repairs. The outcomes were considered in terms of postoperative surgical complications. RESULTS: In total, we observed 11 cases of hernia recurrence (3.9%), 13 cases of infections (4.6%), 7 cases of seroma/hematoma (2.4%) and one case of acute respiratory insufficiency. DISCUSSION: The Rives-Stoppa procedure is, among all those practised, the treatment of choice in incisional hernioplasty. Thanks to the introduction of some simple modifications to this technique and preventing the postoperative infections, we obtained excellent results in terms of recurrence rate (only 1 case on 207 patients, 0.48%) and morbidity.

A key role for abdominal ultrasound examination in "difficult" diagnoses of celiac disease.

PURPOSE: To evaluate the usefulness of abdominal ultrasound examination (US) for the diagnostic workup of cases of suspected CD involving negative serum antibodies and difficult diagnosis. MATERIALS AND METHODS: 524 consecutive patients with symptoms of suspected CD underwent an extensive diagnostic workup. 76 (14 %) were excluded since they were positive for serum anti-tTG and/or EmA antibodies. 377 were excluded since they were diagnosed with something other than CD or did not have the alleles encoding for HLA DQ 2 or DQ 8. A diagnosis of CD with negative serum antibodies was probable in 71 patients who underwent abdominal US and duodenal biopsy for histology evaluation. RESULTS: Intestinal histology and subsequent clinical and histological follow-up confirmed the CD diagnosis in 12 patients (GROUP 1) and excluded it in 59 subjects (GROUP 2). Abdominal US showed that the presence of dilated bowel loops and a thickened small bowel wall had a sensitivity of 83 % and a negative predictive value (NPV) of 95 % in CD diagnosis. Furthermore, in 11 of the 12 CD seronegative patients there was at least one of these two abdominal US signs. Therefore, considering the presence of one of these two signs, abdominal US sensitivity increased to 92 % and NPV to 98 %. CONCLUSION: Abdominal US is useful in the diagnostic workup of patients with a high clinical suspicion of CD but with negative serology.

Low-grade fever: how to distinguish organic from non-organic forms.

BACKGROUND AND AIM: Low-grade fever (LGF) is defined as a body temperature between 37.5 and 38.3 degrees C, which is below the classical value reported for fever of unknown origin (FUO). We attempted to characterise its epidemiology, aetiology and clinical aspects to improve the methodological approach to diagnosis. DESIGN AND METHODS: We reviewed and evaluated a survey of patients with LGF, followed as outpatients of our Department, a tertiary referral centre from 1997 to 2008. The same classifications were applied for classical FUO, and in the patients diagnosed with LGF, we also investigated for habitual hyperthermia (HH). RESULTS: Seventy-three patients were selected and divided into two groups: group A included 32 patients classified with organic fever and group B included 41 patients with HH. Aetiology of organic LGF was: infectious disease 59%; neoplasm 3.1%; inflammatory non-infectious disease 6.2%; miscellaneous 18.7%; undiagnosed 12.5%. Mean age was significantly higher in the organic fever than in the HH group (p < 0.02). Splenomegaly and loss of weight were significantly associated with organic fever (p < 0.05), while dizziness and general malaise were associated with HH. Lack of any pathological signs at physical examination was significantly more frequent in HH (p < 0.0001). Among the biochemical tests, white blood cells and C-reactive protein were more frequently above normal limits in group A than in group B (p < 0.05). CONCLUSIONS: In our experience, LGF requires the same methodological diagnostic approach as FUO, because there is no relationship between body temperature values and the severity of the underlying diseases, and the aetiological spectrum is also the same.

Early discontinuation of ribavirin in HCV-2 and HCV-3 patients responding to Peg-interferon alpha-2a and ribavirin.

Guidelines for the treatment of patients infected with hepatitis C virus of genotypes 2 and 3 (HCV-2 and HCV-3, respectively) recommend a 24-week course of Peg-interferon (Peg-IFN) alpha-2a combined with ribavirin, despite 50% of patients in registration trials attaining a sustained virologic response (SVR) following Peg-IFN alpha-2a monotherapy. The aim of this study was to delineate patient characteristics that might help to identify individuals likely to benefit from ribavirin discontinuation. One hundred and forty-four HCV-2- and HCV-3-infected patients initiated Peg-IFN alpha-2a (180 microg/week) and ribavirin (1000 or 1200 mg/day); those with viral clearance at week 4 were randomized to either Peg-IFN alpha-2a monotherapy (n = 59) or continuing combination therapy (n = 61) until week 12. Overall, all but one patient with a rapid virologic response (RVR) responded by the end of therapy and the overall SVR rates were lower after discontinuation of ribavirin (54%vs 82%; P < 0.001). In RVR patients who discontinued ribavirin, low baseline viraemia helped predict SVR (odds ratio 11.2, 95% CI 2.7-47.1). SVR rates were similar in patients receiving mono- or combination therapy with low (< or =300,000 IU/mL) and intermediate viraemia (86%vs 81% and 70%vs 71%, 86% refers to low viraemic patients receiving monotherapy and 81% to those receiving combination therapy. Similarly, 70% refers to patients with intermediate viraemic levels receiving monotherapy and 71% to those receiving combination therapy), but different in those with high (>700,000 IU/mL) viraemia (37%vs 88%; P = 0.004). Thus in HCV-2- and HCV-3-infected patients, withdrawal of ribavirin and continuation of Peg-IFN alpha-2a monotherapy may be appropriate to attain an SVR, providing viraemia is cleared early during therapy and associated with low baseline viral load. These results warrant future investigations, as discontinuing ribavirin could lead to considerable savings in cost and quality of life related to over-treatment.

Reliability of the bright liver echo pattern in diagnosing steatosis in patients with cryptogenic and HCV-related hypertransaminasaemia.

AIM: To evaluate the reliability of the bright liver (BL) echo pattern on ultrasound to detect histological steatosis in chronic cryptogenic hypertransaminasaemia (CCH) and hepatitis C virus (HCV)-related forms of hypertransaminasaemia. MATERIALS AND METHODS: One hundred and fifty patients, 54 with CCH and 96 with HCV hypertransaminasaemia (76 genotype 1/2 and 20 genotype 3), were enrolled. Histological steatosis was measured as the percentage of hepatocytes involved. The reliability of the BL sign was estimated using the sensitivity, specificity, positive and negative predictive values. RESULTS: Histological steatosis was present in 102/150 patients (68%) divided into 59/96 (62%) in the HCV group and 43/54 (79.6%) in the CCH group (chi(2)=4.4; p=0.035). In a multivariate analysis, the variable associated with the BL echo pattern was steatosis percentage (p=0.0018). Steatosis percentage was higher in CCH group than in the HCV genotype 1/2 and 3 groups (p=0.02). The sensitivity of the BL echo pattern was 88% in the CCH group [confidence interval (CI) 95% 74-95] versus 61% (CI 95% 44-73) in the HCV genotype 1/2 group. The CI indicates that ultrasound can provide evidence for steatosis in a statistically significant way in the CCH versus HCV genotype 1/2 patients. In the genotype 3 group, the sensitivity was high (90%), but the limited number of cases limited the statistical significance due to the high CI. CONCLUSION: In CCH the BL echo pattern has excellent reliability in diagnosing steatosis, better than in HCV hypertransaminasaemia because of the higher prevalence and extent of steatosis.

[Abnormal liver function in brucellosis]. / Alterazioni della funzione epatica in corso di brucellosi.

We assessed the prevalence of impaired liver function in 47 patients suffering from brucellosis consecutively admitted to our department over the last five years. Parameters of liver function and ultrasound of the upper abdomen were performed at entry and at the end of treatment. On admission, mean transaminase values were elevated and significantly higher than at recovery (p 0.001): 38 percent and 53 percent of patients had elevated baseline values of GOT and GPT vs 13 and 19% at the end of treatment, respectively. Mean serum values of alkaline phosphatase (AP) were within normal limits on admission, although in 12 of them serum values were elevated. The same proportion was seen for gamma-glutamyltranspeptidase. Both transaminases and AP were elevated in 8 patients (17 percent). There were no significant differences in serum values of albumin and bilirubin before and after therapy. The platelet count slightly decreased, but not significantly, during the acute phase of disease. At ultrasound one third of the patients showed hepatomegaly with a hepatitis-like pattern and 40 percent of patients had splenomegaly. In conclusion, this study confirms data in the literature showing a high frequency of liver impairment during the course of brucellosis, which is usually mild-moderate.

Hepatitis C virus infection in hemodialyzed patients.

In spite of our present improved knowledge of the epidemiology and pathways of contamination of the hepatitis C virus (HCV), infection still remains a public health problem. One category of patients who have suffered greatly from the consequences of HCV infection is certainly that of hemodialysis patients. In the past, in fact, their need for transfusions exposed these patients to infection and, as a result, subjects on dialysis for over 15 years are today paying the price for those inevitable transfusions, as the virus and its pathways of contagion were unknown then. However, still today, albeit at a much lower prevalence, even subjects with a shorter dialysis age present a higher prevalence of anti-HCV than the general population, suggesting that other factors of contamination than the classical ones contribute to keeping this prevalence high. Its clinical course is generally asymptomatic and the biological and virological progression of the disease is quite particular and apparently benign. The mortality rate of infected patients is higher than in noninfected subjects and this is not only due to the liver disease itself but also to cardiovascular disorders. Even anti-viral therapy, after its first timid steps, is now routinely used in patients with a certain degree of liver damage and kidney transplant candidates. The appropriate use of pegylated interferons is expected to improve the percentage of eradication and limit side effects, in parallel with what has been observed in non-dialysis patients. Ribavirin, however, is at present contraindicated due to its toxic effects on red blood cells as hemoglobin content could be dangerously reduced in these patients.

[Patient satisfaction in hemodialysis: a pilot cross-sectional analysis and a review]. / Valutazione del grado di soddisfazione da trattamento nel paziente in emodialisi: metologia di ricerca, strumenti, limiti e studio pilota trasversale.

BACKGROUND: Assessment of patient satisfaction is not performed routinely in many healthcare institutions. In this review, we discuss methodological aspects of assessment of patient satisfaction in hemodialysis. We also present a pilot study conducted in the Gambro Healthcare Italy dialysis clinics network. METHODS: Patient satisfaction was assessed in a network of hemodialysis units by using an internally validated Italian translation of the Choices for Healthy Outcomes in Caring for ESRD (CHOICE) questionnaire. A cross-sectional analytic study design was used and data analysed with univariate and multivariate hierarchical logistic regression to explore correlates of the risk of being unsatisfied with dialysis treatment. Covariates which were considered include a series of over 20 clinical, demographic, organizational and structural aspects. In addition, unexplained inter-centre residual variability due to 'case-mix' was explored and plotted. RESULTS: Seventeen dialysis units participated in this cross-sectional analysis and 758/1001 (75.7%) provided answers to the questionnaires. There was a statistically significant association on multivariate hierarchical analysis between the risk of being unsatisfied with dialysis treatment and interdialysis body weight gain (unit of increase: 1 kg, p=0.004). On the contrary, the risk of unsatisfaction with dialysis treatment was significantly lower in patients with higher dry weight (unit of increase: 1 kg, p=0.002). Our multivariate hierarchical analysis identified some residual variability between dialysis units (n=6 outliers) which may not be explained by any of over 20 potential confounding covariates which were explored. CONCLUSIONS: Assessment of ''customer satisfaction'' is standard practice in private for profit product companies in general but needs to be increasingly recognized as a standard in both public and private providers of healthcare services. Social research methods, which are used for this type of analysis, need to be fine tuned and actively implemented in order to better understand how we may influence the quality of service we provide to our patients and the level at which they rate it.

Sex hormones and risk of liver tumor.

The liver is morphologically and functionally modulated by sex hormones. Long-term use of oral contraceptives (OCs) and anabolic androgenic steroids (AASs) can induce both benign (hemangioma, adenoma, and focal nodular hyperplasia [FNH]) and malignant (hepatocellular carcinoma [HCC]) hepatocellular tumors. Hepatic adenomas (HAs) are rare, benign neoplasms usually occurring in young women, the development and the complications of which have been related to the strength of OCs and the duration of their use. HA incidence has fallen since the introduction of pills containing smaller amounts of estrogens. FNH is a benign lesion, most commonly seen in young women, which is thought to represent a local hyperplastic response of hepatocytes to a vascular abnormality. Because of the female predominance and the young age at onset, a role of female hormones has been suggested. Furthermore, a large proportion of women with FNH (50-75%) are OC users. Liver hemangiomas (LHs) are the most common benign liver tumors and are seen more commonly in young adult females. The female predilection and clinical observations of LH growth under conditions of estrogenic exposure suggest a possible role for estrogen in the pathogenesis of LHs. HCC has become one of the most widespread tumors in the world in recent years, representing the sixth leading cancer and the third most common cause of death from cancer. Apart from liver cirrhosis, numerous other factors responsible for its onset have been proposed: hepatitis infections from virus B (HBV) and C (HCV), alcohol, smoking, and aflatoxin. However, regardless of etiology, chronic liver diseases progress at unequal rates in the two sexes, with the major sequelae, such as cirrhosis and HCC, being more frequent in men than in women. These epidemiological data have prompted researchers to investigate the relationship between sex hormones and liver tumors. The human liver expresses estrogen and androgen receptors and experimentally both androgens and estrogens have been implicated in stimulating hepatocyte proliferation and may act as liver tumor inducers or promoters.

Multiple Organ Failure Associated With Coxsackie Virus in a Kidney Transplant Patient: Case Report.

INTRODUCTION: Viral myocarditis can emerge with various symptoms, including fatal arrhythmia and cardiogenic shock, potentially evolving in chronic myocarditis or dilatative cardiomyopathy. We report a case of a kidney transplant patient affected by coxsackie viral myocarditis. METHODS: A 49-year-old man was admitted to our hospital with dyspnea and fever in August 2014. He underwent living donor kidney transplantation in 1986 and polar graft resection for papillary carcinoma in 2012. RESULTS: The initial investigation showed pulmonary congestion, pancreatitis, increased serum troponin I, and increased liver enzyme levels. Echocardiogram revealed an ejection fraction (EF) of 20% and PAPS 45 mm Hg. He underwent coronary stent implantation, started hemodialysis, and continued on low-dose steroid immunosuppressive therapy. The clinical course improved rapidly, but endomyocardial biopsy showed acute myocarditis. Further investigation revealed a high antibody titer against coxsackievirus B4 and B5. Pancreatic enzyme levels normalized 2 months after patient admission; his cardiac condition improved after 6 months. The patient has been followed for 1 year, and his left ventricular EF is stable (45%). CONCLUSIONS: Viral myocarditis represents a serious clinical condition requiring a fast therapeutic intervention. This patient's clinical course suggests that changes in his immunosuppressive therapy were associated with progressive amelioration of his viral myocarditis.

NUPR1, a new target in liver cancer: implication in controlling cell growth, migration, invasion and sorafenib resistance.

Sorafenib, an oral multikinase inhibitor, is the only approved agent for the treatment of advanced hepatocellular carcinoma (HCC). However, its benefits are modest, and as its mechanisms of action remain elusive, a better understanding of its anticancer effects is needed. Based on our previous study results, we investigated here the implication of the nuclear protein 1 (NUPR1) in HCC and its role in sorafenib treatment. NUPR1 is a stress-inducible protein that is overexpressed in various malignancies, but its role in HCC is not yet fully understood. We found that NUPR1 expression was significantly higher in primary human HCC samples than in the normal liver. Knockdown of NUPR1 significantly increased cell sensitivity to sorafenib and inhibited the cell growth, migration and invasion of HCC cells, both in vitro and in vivo. Moreover, NUPR1 silencing influenced the expression of RELB and IER3 genes. Unsurprisingly, RELB and IER3 knockdown also inhibited HCC cell viability, growth and migration. Using gene expression profiling of HCC cells following stable NUPR1 knockdown, we found that genes functionally involved in cell death and survival, cellular response to therapies, lipid metabolism, cell growth and proliferation, molecular transport and cellular movement were mostly suppressed. Network analysis of dynamic gene expression identified NF-κB and ERK as downregulated gene nodes, and several HCC-related oncogenes were also suppressed. We identified Runt-related transcription factor 2 (RUNX2) gene as a NUPR1-regulated gene and demonstrated that RUNX2 gene silencing inhibits HCC cell viability, growth, migration and increased cell sensitivity to sorafenib. We propose that the NUPR1/RELB/IER3/RUNX2 pathway has a pivotal role in hepatocarcinogenesis. The identification of the NUPR1/RELB/IER3/RUNX2 pathway as a potential therapeutic target may contribute to the development of new treatment strategies for HCC management.

Spontaneous Bilateral Adrenal Haemorrhage after Duodenopancreatectomy: a case report.

it is difficult to diagnose because of its nonspecific presentation. This condition frequently occurs in association with an extreme physical stress and may lead to acute adrenal insufficiency or death if not promptly and properly treated. We report a rare case of acute bilateral adrenal hemorrhage with adrenal insufficiency following duodenopancreatectomy for ampulloma in absence of surgical complications. Early diagnosis and corticosteroid replacement with aggressive management of the precipitating pathology are essential to enable a successful outcome.

Cold pressor test raises serum concentrations of ICAM-1, VCAM-1, and E-selectin in normotensive and hypertensive patients.

In patients with essential hypertension, elevated soluble E-selectin (sE-selectin) levels may indicate endothelial cell injury or activation. We therefore sought to ascertain whether arterial blood pressure increased by the cold pressor test can modify serum concentrations of sE-selectin and other soluble forms of adhesion molecules, such as soluble intercellular adhesion molecule-1 (sICAM-1) and soluble vascular cell adhesion molecule-1 (sVCAM-1), or the expression of any adhesion molecules in circulating monocytes and lymphocytes. Our findings show that levels of sE-selectin, sVCAM-1, and sICAM-1 are higher in patients with essential hypertension than in normotensive subjects (sICAM-1, 380 +/- 52 versus 262 +/- 96 ng/mL, P<.05; sVCAM-1, 720 +/- 52 versus 625 +/- 38 ng/mL, P<.05; and sE-selectin, 75 +/- 21 versus 61 +/- 22 ng/mL, P<.05). Furthermore, in normotensive and hypertensive patients, the cold pressor test caused an increase in serum concentrations of sICAM-1, sVCAM-1, and sE-selectin, but it did not cause changes in the expression of adhesion molecules in circulating monocytes and lymphocytes. High arterial blood pressure may therefore increase the production of serum adhesion molecules, probably through endothelial activation.

Thyroid carcinoma usually occurs in patients with familial adenomatous polyposis in the absence of biallelic inactivation of the adenomatous polyposis coli gene.

Papillary thyroid carcinoma (PTC) is a rare extracolonic manifestation of familial adenomatous polyposis, determined by germline mutations of the adenomatous polyposis coli (APC) gene. The aim of this study was to assess the presence of loss of heterozygosity of APC in the thyroid tumoral tissue. Specimens from six female patients, aged 20-36, were analyzed for germline and somatic mutations of the APC gene by restriction enzyme analysis and sequence analysis. Five of the six also had analysis for ret/PTC, a chimeric gene, the activation of which is restricted to papillary TC. Because a previous study showed that germline mutations in familial adenomatous polyposis-associated thyroid carcinoma were located between codons 140 and 1513, the search for somatic mutations of the APC gene was restricted to this genomic area. Three of the six patients, belonging to the same kindred, had a germline mutation at codon 1061. The remaining three, one per kindred, had germline mutations at codons 1061, 1061, and 1309, respectively. None of the six patients had loss of heterozygosity for APC or somatic mutation in the explored genomic area (codon 545 and codons 1061-1678). Four of five had activation of ret/PTC in the thyroid tumoral tissue, as ret/PTC1 isoform. Either APC has a tissue-specific dominant effect in the thyroid gland or the germline mutation confers a generic susceptibility to cancer development, but other factors (sex-related factors, environmental radiation, modifier genes) are also required for TC development. This usually involves ret/PTC activation, suggesting a possible cooperation between altered function of APC and gain of function of ret.

Germline mutations of the APC gene in patients with familial adenomatous polyposis-associated thyroid carcinoma: results from a European cooperative study.

Papillary thyroid carcinoma (PTC) is one extracolonic manifestation affecting about 1-2% of patients with familial adenomatous polyposis (FAP). Ninety-seven patients with FAP-associated PTC have previously been reported, including 6 pairs of siblings. During a European collaborative study, 15 patients with FAP-associated PTC were collected. All 15 patients were females. The mean age at thyroidectomy was 24.9 yr (range, 19-39 yr). In 13 subjects, APC germline mutations had been detected; they were at codons 140, 593, 778, 976, 993, 1061 (n = 5), 1105 (n = 1), and 1309 (n = 2), respectively. A review of the literature added 11 other patients with FAP-associated PTC and detection of germline APC mutations; they were at codons 313 (n = 2), 698 (n = 3), 848 (n = 2), 1209 (n = 2), 1061 (n = 1), and 1105 (n = 1), respectively. The latter led to formation of the same stop codon (TAA) at 1125-1126 as the mutation at codon 1061. Therefore, 21 of 24 mutations were in exon 15 in the genomic area usually associated with congenital hypertrophy of the retinal pigment epithelium (CHRPE), i.e. codons 463-1387. Typical CHRPE was found in 17 of 18 affected patients who had specific screening. Interestingly, 22 of the 24 patients had their mutation out of the mutation cluster region (codons 1286-1513), which is currently considered the hot spot mutation area, in particular for extracolonic manifestations of FAP. The difference in the incidence of germline mutations before and after codon 1220 between PTC and non-PTC FAP patients was statistically significant (P<0.05) for both patients and kindreds (P = 0.005 and P = 0.049, respectively). Even if most mutations were scattered throughout the entire 5'-portion of exon 15, 8 of 23 patients (6 with mutation at 1061 and 2 with mutation at 1105; i.e. more than one third) had the same truncated protein product. The awareness that patients with PTC usually have APC mutations that cluster in a well defined genomic area, in addition to giving a deeper insight into gene function, could facilitate both earlier diagnosis and better treatment. In particular, intensive screening for thyroid nodules after age 15 yr is recommended when a single patient or an entire kindred have CHRPE and/or mutations in the 5'-portion of exon 15.

The ret/ptc1 oncogene is activated in familial adenomatous polyposis-associated thyroid papillary carcinomas.

Familial adenomatous polyposis (FAP) is caused by germ-line mutations of the apc gene, and it is associated with an increased risk of developing papillary thyroid carcinomas. We have previously reported that a significant fraction of sporadic human papillary thyroid carcinomas is characterized by gene rearrangements affecting the ret protooncogene. These rearrangements generate chimeric transforming oncogenes designated ret/ptc. By a combined immunohistochemical and RT-PCR approach, we analyzed, for ret/ptc oncogene activation, papillary thyroid carcinomas occurred in two FAP kindreds, both showing typical apc gene mutations. Kindred 1 had seven members affected by FAP, and among these, three patients showed papillary thyroid carcinomas. Kindred 2 had two patients, mother and daughter, affected by colonic polyposis; the 20-yr-old daughter showed also a papillary carcinoma. Here we report that ret/ptc1 oncogene was activated in two of the three papillary carcinomas of FAP kindred 1 and in the papillary carcinoma of FAP kindred 2. These findings document that loss of function of apc coexists with gain of function of ret in some papillary thyroid carcinomas, suggesting that ret/ptc1 oncogene activation could be a progression step in the development of FAP-associated thyroid tumors.

Downregulation of wild-type beta-catenin expression by interleukin 6 in human hepatocarcinoma HepG2 cells: a possible role in the growth-regulatory effects of the cytokine?

We investigated the antitumour effects of interleukin 6 (IL-6) on hepatocarcinoma HepG2 cells, endowed with high levels of a mutated, non-degradable, beta-catenin. IL-6 produced minimal growth-inhibitory effects and no apoptosis or gross changes in cell adhesion. Interestingly, however, it caused a consistent decrease in the cytoplasmic levels of wild-type, but not of mutated, beta-catenin protein. There was no effect on E-cadherin or gamma-catenin and a reduction in alpha-catenin occurred only at high concentrations. IL-4, a non-related cytokine, did not modify the content of beta-catenin. IL-6 did not influence beta-catenin mRNA levels. LiCl, a potent inhibitor of Glycogen Synthase Kinase 3beta (GSK3beta) activity, abrogated the IL-6-induced inhibition of wild-type beta-catenin. This indicates that IL-6 can affect wild-type beta-catenin through a post-transcriptional mechanism, probably involving degradation of the protein. This effect might be related to the growth-regulatory activities of IL-6 in other situations, but can not counteract the oncogenic expression of mutated beta-catenin in HepG2 cells or possibly in other tumour cells with similar gene mutations.

Monoclonal antibodies to pancreatic stone protein. Radioimmunoassay and immunological comparison with trypsin 1.

Monoclonal antibodies were prepared against pancreatic stone protein, a protein which inhibits calcium carbonate precipitation. Two monoclonal antibodies designated D4 and 2E7 were characterized. Immunoadsorbant columns, obtained by linkage of these monoclonal antibodies to Affigel 10, have been used to isolate immunoreactive forms of pancreatic stone protein from nonactivated human pancreatic juice. These monoclonal antibodies permitted us to test the possible immunological relationship between pancreatic stone protein and human trypsin 1. No immunological similarity was found, in agreement with our previous results, and it was established that pancreatic stone protein is a novel protein and not a degradation product of human trypsin(ogen) 1.