Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0027651 (tumor)
 685,946 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Dialysis-related amyloidosis (DRA), characterized by its association with beta 2-microglobulin (beta 2m), has become a major concern in long-term hemodialysis patients. Hitherto the diagnosis was based on histological examinations of tissue obtained by biopsy or during surgery. In this preliminary study a new noninvasive diagnostic method was developed using the affinity of beta 2m for its derived fibrils. 3 patients on long-term hemodialysis for 10-16 years with biopsy-proven DRA and 1 patient on chronic hemodialysis for only 6 months were examined after intravenous injection of 131I-labelled beta 2m. Specific local accumulation of radioactivity was noted in the DRA patients after 48 h, persisting for further 96 h and corresponding to clinically or radiologically evident sites of amyloid deposition and to several other hitherto unsuspected sites. Examination of an excised amyloid tumor subsequent to in vivo labelling confirmed a highly specific accumulation of radioactivity in the amyloid tissue but not in control tissue. In the patient on chronic hemodialysis for only 6 months, no specific local accumulation was detected even after 1 week. These findings provide in vivo evidence in man that a specific uptake of circulating amyloid precursor molecules into deposits occurs and that this uptake may be used to radiolabel even small tissue infiltrates of amyloid. This method therefore may not only allow an objective, noninvasive detection of DRA but may also be used to obtain new pathophysiologic insights into amyloid formation in man, as well as permitting the evaluation of preventive therapeutic strategies in prospective studies on new patients.
Nephron 1989
PMID:Specific imaging of dialysis-related amyloid deposits using 131I-beta-2-microglobulin. 264 37

We describe the occurrence of a nephrotic syndrome in association with transitional cell carcinoma of the bladder. The proteinuria disappeared several weeks after removal of the tumor. Light and electron microscopy were compatible with a minimal-change lesion, but immunofluorescence showed linear immunoglobulin deposition. Immunoglobulins eluted from the tumor reacted specifically with the kidney and vice versa. We conclude that antibody formation against a specific component of basement membrane common to both kidney and tumor gave rise to the nephropathy in this case.
Nephron 1989
PMID:Nephrotic syndrome associated with transitional cell carcinoma of the bladder. 265 48

beta 2-Microglobulin (beta 2M)-derived amyloidosis has become a major concern in long-term hemodialysis patients. Clinical symptomatology is largely restricted to the articular and periarticular sites and in rare cases systemic manifestations have been described. We present a long-term hemodialysis patient, who after 16 years of hemodialysis with regenerated cellulosic membranes not only had a bilateral carpal tunnel syndrome, cystic bone translucencies and humeroscapular periarthritis but also developed two subcutaneous tumors in both gluteal regions, causing discomfort when sitting. Histology, immunohistology and electron microscopy of the tumor from the right side showed that it consisted of beta 2M-derived amyloid with concurrent scattered amyloid infiltration of the overlying skin. This report therefore adds a new clinical manifestation to the symptomatology of this type of amyloid.
Nephron 1989
PMID:Subcutaneous amyloid-tumor of beta-2-microglobulin origin in a long-term hemodialysis patient. 267 45

Chemotherapy of liver metastases is dependent on adequacy of tumor microcirculation. Attempts have been made, experimentally, to improve tumor blood flow with appropriate vasoactive agents. Capillary blood flow within intrahepatic Walker carcinosarcomas and normal liver were measured with a laser doppler needle probe. Tumor capillary blood flow increased briefly but significantly with intraportally administered epinephrine. This effect was blocked by phenoxybenzamine but not by propranolol. The response of capillary flow in normal liver to epinephrine was dose related, with decreased flow with higher doses, and slight increase with lower doses. Norepinephrine and phenylephrine produced brief increases in capillary flow in tumor and liver, and isoproterenol caused a decreased flow. In studies with injected silicone rubber (Microfil, Canton Bio-Medical Products, Boulder, CO) performed previously, and on electron microscopic examination, there was evidence of increased vascular filling within central areas of tumors after epinephrine. These studies suggest that the brief but potent effect of epinephrine on tumor capillary flow could be useful in improving delivery of chemotherapeutic agents to liver tumors.
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PMID:Increased capillary flow in intrahepatic tumors due to alpha-adrenergic effects of catecholamines. 283 47

Recent evidence indicates that stress can suppress immune responses and thus increase the severity of viral and neoplastic diseases. Although, the mechanisms for stress-induced modulation of immunologic competence are unclear, neuroendocrine hormones are thought to be involved. A direct suppressive effect could result from the action of neuroendocrine hormones on lymphokine and monokine release. The central role of interleukin-1 (IL-1) in regulating cellular immune responses to infection and neoplasms stimulated the present study evaluating the effects of neuroendocrine hormones on IL-1 production. Norepinephrine and epinephrine inhibited the capacity of gamma interferon and lipopolysaccharide to stimulate IL-1 production from mouse peritoneal macrophages. Moreover, when intracellular and extracellular levels of IL-1 were quantitated, the studies demonstrated a catecholamine-mediated block in IL-1 synthesis without effect on its release. We also observed that exogenous cyclic AMP (cAMP) administered to mouse macrophages suppressed IL-1 production. This, coupled with the capacity of norepinephrine and epinephrine to enhance intracellular cAMP levels in macrophages, strongly suggested that the catecholamine-induced suppression of IL-1 production may be mediated by elevated intracellular cAMP levels. These findings demonstrate that selected stress-related neuroendocrine hormones can modulate IL-1 production by macrophages and further support the hypothesis that alteration of macrophage function by neuropeptides and neurohormones is a significant feature of stress-induced enhancement of viral and neoplastic disease.
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PMID:Catecholamine-induced suppression of interleukin-1 production. 302 61

We performed a study of hyperthermia while injecting 0.05% of Noradrenaline following MMC for 10 minutes into the feeding artery of Walker-256 carcinosarcomas implanted 6 days earlier into the s.c. dorsum side of hindpaw of Wistar rats. The tumor growth rates on the 6th day after treatment by warning tumor in hot water (40 degrees C, 44 degrees C) for 10 minutes with or without Noradrenaline, were 0.7 +/- 0.6, 2.1 +/- 0.9 (40 degrees C) and 0.2 +/- 0.3, 0.0 +/- 0.0 (44 degrees C), respectively. The data suggested that tumor ischemia induced by a vasoconstrictive drug may enhance the antitumor effect in low grade warning therapy (40 degrees C). An injection of warmed physiological saline (50 degrees C) may heat the tumor vessels on the tumor surface and showed enhanced antitumor effects as a from of hyperthermia. The target area of the tumor for hyperthermia can be considered to be the tumor vessels on the tumor surface.
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PMID:[Enhancement of antitumor effect of MMC on Walker 256 by intra-arterial administration of noradrenaline in hyperthermia]. 313 74

In 4 patients (2 males, 2 females), aged between 16 and 62 years, who had surgery for pheochromocytoma, the effects of Falipamil, a compound with selective negative chronotropic action, was tested. This drug, which is a slow calcium channel blocking agent, was administered during the period of massive endogenous catecholamine output caused by tumor mobilisation; the influence on mean arterial pressure, pulmonary artery pressure, central venous pressure and cardiac index as well as catecholamines was investigated. When the pulse rate exceeded 100 beats per minute in the course of surgical preparation, 2 mg/kg BW Falipamil were administered as in i.v. bolus dose. Epinephrine and norepinephrine were determined before and 5 minutes after Falipamil administration in one patient. The effect of this bolus dose was a significant decrease in heart rate. There was also a moderate decrease in mean arterial pressure and cardiac index, with was probably caused by pretreatment with alpha- and beta-blockers prior to surgery, whereas central venous pressure and pulmonary artery pressure remained unchanged. Norepinephrine increased, epinephrine decreased. These findings lead us to conclude that Falipamil is a valuable adjunct to control circulation in patients with high catecholamines.
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PMID:[Falipamil for decreasing intraoperative heart rate in pheochromocytoma]. 321 76

An 11-year-old boy developed Kaposi's sarcoma and progressive T lymphocyte deficiency 5 years after cadaveric kidney transplantation for end-stage renal disease. He had received 17 individual red blood cell transfusions prior to and during transplantation in 1980. Human immunodeficiency virus (HIV) was cultured from blood in cerebrospinal fluid and HIV antibodies were detected with enzyme immunoassay and immunoblot techniques. The recipient of the donor's other kidney was well and HIV antibody-negative. The patient was treated with etoposide with excellent although transient regression of tumor. Allograft function has remained stable despite minimal immunosuppressive therapy and the need for high-dose anticonvulsant therapy. This case represents the first pediatric patient with acquired immune deficiency syndrome (AIDS) and Kaposi's sarcoma following kidney transplantation.
Nephron 1987
PMID:Human immunodeficiency virus-associated Kaposi's sarcoma in a pediatric renal transplant recipient. 330 30

A 23-year-old white male was referred for hypertension resistant to triple antihypertensive treatment, with hypokalemia, hyperaldosteronism and elevated levels of circulating plasma renin activity (PRA). Renal angiography and echoscans put in evidence an avascular solid mass at the midlower level of the right kidney. Renal vein catheterization with sampling of blood from the lower branches of the right renal vein showed lateralization of renin secretion from that side. After surgical exeresis, the mass (1.0 cm) was diagnosed as a renal hemangiopericytoma on the basis of light and electron microscopy. Tumor exeresis was followed by a prompt normalization of blood pressure and plasma potassium, with a decrease in PRA and aldosterone. Two months after surgery the patient was still normotensive. Circulating levels of inactive (trypsin-activable) renin were around 60% of the total pool of plasma renin, i.e. much lower than those reported in other cases of renin-secreting tumors. After surgery, inactive and active renin fell in parallel, implying that both were secreted by the tumor. Tumoral PRA responded to postural stimulation, but was unresponsive to acute converting enzyme inhibition, suggesting that sympathetic stimuli were still operative, but the negative feedback inhibition by angiotensin II on renin secretion was lost. Acute converting enzyme inhibition by captopril dropped blood pressure; however, during long-term treatment, the drug (3 X 50 mg/day) was ineffective in terms of either blood pressure normalization or relief of secondary hyperaldosteronism. Acute calcium entry blockade by nifedipine (10 mg p.o.) caused an evident blood pressure drop.
Nephron 1987
PMID:A renin-secreting tumor. 330 96

A clinical study was performed in 2 groups of patients with solitary kidneys, followed for 11-146 months. Group 1 had 9 patients (7 males and 2 females, aged between 23 and 68 years) with unilateral renal agenesis. Group 2 had 13 patients (9 females and 4 males, aged between 27 and 70 years) who underwent unilateral nephrectomy for the following reasons: hydronephrosis secondary to ureteropelvic junction stenosis, 7 patients; renal trauma, 4 patients; benign neoplasia, 2 patients. During the follow up, urinary protein excretion of more than 300 mg/day was observed in 9 patients, 3 in group 1 and 6 in group 2. Eleven patients, 8 in group 1 and 3 in group 2, were hypertensive (diastolic blood pressure higher than 95 mm Hg). Hyperuricemia was observed in 14 patients, 10 in group 1 and 4 in group 2. Seven patients, 4 in group 1 and 3 in group 2, had a significant deterioration of renal function. Neither proteinuria nor renal failure were observed before at least 10 years had elapsed since the anatomic condition of solitary kidney had been established. A surgical renal biopsy was performed in 1 patient with unilateral renal agenesis and showed focal glomerular sclerosis. This study adds support to the view that the reduction of 50% of the renal tissue may be a risky situation in humans as well as in animals.
Nephron 1986
PMID:Clinical features of patients with solitary kidneys. 351 62


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