Angiotensin II up-regulates angiotensin I-converting enzyme (ACE), but down-regulates ACE2 via the AT1-ERK/p38 MAP kinase pathway.

The recent discovery of the angiotensin II (Ang II)-breakdown enzyme, angiotensin I converting enzyme (ACE) 2, suggests the importance of Ang II degradation in hypertension. The present study explored the signaling mechanism by which ACE2 is regulated under hypertensive conditions. Real-time PCR and immunohistochemistry showed that ACE2 mRNA and protein expression levels were high, whereas ACE expression levels were moderate in both normal kidney and heart.

Advanced glycation end products activate a chymase-dependent angiotensin II-generating pathway in diabetic complications.

Background: Angiotensin II is a key mediator of diabetes-related vascular disease. It is now recognized that in addition to angiotensin-converting enzyme, chymase is an important alternative angiotensin II-generating enzyme in hypertension and diabetes. However, the mechanism of induction of chymase in diabetes remains unknown.

HER-2/neu and CD117 (c-kit) overexpression in patients with pesticide exposure and extensive stage small cell lung carcinoma (ESSCLC).

Background: The rate of detection of HER-2/neu and CD117 (c-kit) overexpression in small cell lung cancer (SCLC) has varied widely; between 5-35% and 21-70% respectively.

Methods: To evaluate the relationship between pesticide exposure and HER-2/neu and CD117 overexpression in extensive stage SCLC (ESSCLC), we identified patients with ESSCLC and assessed pesticide exposure using a predetermined questionnaire. An exposure index (hours/day x days/year x years) > or = 2400 hours was considered as 'exposed.

Transforming growth factor-beta and Smad signalling in kidney diseases.

Extensive studies have demonstrated that transforming growth factor-beta (TGF-beta) plays an important role in the progression of renal diseases. TGF-beta exerts its biological functions mainly through its downstream signalling molecules, Smad2 and Smad3. It is now clear that Smad3 is critical for TGF-beta's pro-fibrotic effect, whereas the functions of Smad2 in fibrosis in response to TGF-beta still need to be determined.

Determination of HER-2/neu overexpression and clinical predictors of survival in a cohort of 347 patients with primary malignant brain tumors.

Introduction: HER-2/neu overexpression has been associated with poor prognosis in a variety of malignancies. The extent and relevance of HER-2/neu overexpression in human central nervous system (CNS) malignancies is unclear. We retrospectively analyzed a large cohort of patients with primary malignant brain tumors to evaluate the role of HER-2/neu overexpression, clinical characteristics at presentation, and other predisposing factors as predictors of survival.

Effect of pesticide exposure on HER-2/neu overexpression seen in patients with extensive stage small cell lung carcinoma.

Purpose: The aim of this study was to evaluate the relationship, if any, between pesticide exposure and overexpression of the HER-2/neu oncoprotein in extensive stage small cell lung cancer (ESSCLC).

Experimental Design: The records of all patients with a diagnosis of ESSCLC from January 1991 through April 2001 were reviewed in our retrospective study. Pesticide risk (herbicide and insecticide) was assessed by telephone interviews using a predetermined questionnaire with emphasis on type of exposure, use of protective measures, and duration of exposure.

Role of Her-2/neu overexpression and clinical determinants of early mortality in glioblastoma multiforme.

Her-2/neu or c-erbB-2, a 185-kD protein is an important prognostic indicator/target for therapy in metastatic breast carcinoma. Recent reports have also identified a role for Her-2/neu overexpression in other solid tumors. We performed a retrospective analysis to evaluate the prevalence and prognostic role of Her-2/neu overexpression in patients with glioblastoma multiforme (GBM).

Myeloproliferative syndromes and the associated risk of coronary artery disease.

Introduction: Of the major myeloproliferative syndromes (MPS) [polycythemia vera (PV), essential thrombocythemia (ET), chronic myeloid leukemia (CML) and myelofibrosis (MF)], PV and ET are reported to be associated with increased thrombotic complications. However, the relationship between these myeloproliferative syndromes and coronary artery disease (CAD) is unclear.

Methods: We performed a retrospective chart review to evaluate the prevalence of CAD in patients with diagnosed with MPS between 1991 and 2001.

Predictive value of clinical features at initial presentation in pancreatic adenocarcinoma: a series of 308 cases.

Pancreatic cancer is the fourth leading cause of cancer death in both men and women with a mortality incidence ratio of 0.99. In an effort to describe the role of clinical features at initial presentation, we conducted a retrospective observational study in patients with a biopsy-proven diagnosis of adenocarcinoma of the pancreas.

Effect of low-molecular-weight heparin on potassium homeostasis.

Background: Low-molecular-weight heparins (LMWHs) are being preferred to unfractionated heparin (UFH) because of their superior convenience and a comparable or slightly better toxicity profile. Whether LMWH has an inhibitory effect on aldosterone that causes hyperkalemia is yet uncertain.

Methods: Twenty-eight patients (all male; mean age: 70 years, range 52-87 years) placed on LMWH therapy (40 mg subcutaneously every 12 h) for deep venous thrombosis prophylaxis after an operation were included in the study.

An epidemiological study evaluating the relationship of distance from a tertiary care cancer center to early detection of colorectal carcinoma.

Objective: AJCC stage at diagnosis determines the treatment approach and indirectly predicts outcome in patients with colorectal carcinoma. The purpose of our study was to investigate whether there was a delay in diagnosis leading to a more advanced stage at diagnosis (which affects outcome) of patients with colorectal cancers because of distance from a referral center, after positive fecal occult blood testing (FOBT).

Design: Our retrospective observational study involved all cases of colonic and rectosigmoid cancers that were referred for an endoscopic procedure after an initial positive FOBT done as a part of routine screening in asymptomatic patients.

Identification and relationship of HER-2/neu overexpression to short-term mortality in primary malignant brain tumors.

Introduction: HER-2/neu overexpression has been associated with poor prognosis in solid tumors. The extent to which HER-2/neu is overexpressed in human central nervous system malignancies is unclear. We retrospectively analyzed a large cohort of patients with primary brain tumors to evaluate the prognostic role of HER-2/neu overexpression and clinical characteristics at presentation in patients with shortened survival (< 6 months).

Role of immunohistochemical identification of Her-2/neu and detection of variability in overexpression in pancreatic carcinoma.

Introduction: Her-2/neu overexpression has been recently shown to be a poor prognostic factor in breast carcinoma. Overexpression has also been demonstrated in adenocarcinoma of the pancreas but the significance is unclear. We attempted to study the role of Her-2/neu overexpression, detected by immunohistochemistry, in pancreatic carcinoma and also examined for variability of overexpression across different tissue sections on individual tumor specimen.

Spinal epidural abscess after corticosteroid injections.

Although spinal epidural abscess is uncommon, its incidence is likely to rise with increasing use of epidural injections for the control of lower back pain. We report a case of spinal epidural abscess after epidural steroid injection. The abscess resolved with conservative medical management.

Hyperhomocysteinemia and the risk of thromboembolic phenomenon in patients with chronic renal failure.

Thromboembolic phenomena are a major cause of morbidity and mortality in patients with end-stage renal disease. Studies in patients with chronic renal failure (CRF) have demonstrated an increased relative risk of coronary artery disease (CAD) in association with hyperhomocysteinemia (HHe). However, very little data exist about the causal relationship between HHe and cerebrovascular diseases (CVA) in patients with CRF.