Isoelectric focusing patterns of urinary kallikrein in Dahl salt-hypertension susceptible and resistant rats.

Dahl salt-sensitive (S) rats which are susceptible to hypertension have lower urinary kallikrein excretion than salt-resistant (R) rats which are not susceptible. Some physicochemical characteristics of partially purified urinary kallikrein were compared between the S and R strains. The isoelectric focusing pattern of S kallikrein was shifted so that a higher proportion of enzyme was present in isoelectric forms that had higher pI values compared to the pattern for R kallikrein.

Hormonal effects on kallikrein, esterase A2, and their inhibitors in rat urine.

The effects of various hormones on the urinary excretion of kallikrein and esterase A2 were studied in rats. Chronic treatment with antidiuretic hormone had no effect on the excretion of either enzyme. Deoxycorticosterone treatment or a low sodium diet stimulated urinary kallikrein excretion (as is well known), but had no effect on urinary esterase A2.

Isolation and partial characterization of rat urinary esterase A2.

An enzyme, esterase A2, which hydrolyzes tosyl-arginine methyl ester was isolated from the urine of female, inbred, Dahl-salt-resistant rats using DEAE-Sephadex ion-exchange, aprotinin-agarose affinity and molecular sieve column chromatography. The purest preparation obtained showed four closely migrating bands on polyacrylamide gel electrophoresis. All four bands of the esterase A2 preparation had enzyme activity since all were stainable on zymograms using N-acetyl-L-methionine alpha-naphthyl ester as substrate.

Proteins binding to kallikrein and esterase A2 in the urine of salt-sensitive and salt-resistant rats.

Iodine-labeled ([125I]) rat urinary kallikrein and rat urinary TAME esterase A2 were used as probes to look for urinary and plasma proteins that bind to these enzymes. Such proteins are presumptive enzyme inhibitors. Complexes formed with labeled enzymes were identified by polyacrylamide gel electrophoresis followed by autoradiography.

Anomalous response of urinary kallikrein to deoxycorticosterone in Dahl salt-sensitive rats.

Previous evidence shows that salt-sensitive (S) rats have a net increase in plasma mineralocorticoid activity due to 18-hydroxy-11-deoxycorticosterone and decreased urinary kallikrein excretion compared to salt-resistant (R) rats. Since mineralocorticoids stimulate urinary kallikrein excretion, these results are inconsistent. This inconsistency was explained by the fact that, while R rats responded normally to treatment with deoxycorticosterone (DOC) by an increase in urinary kallikrein excretion, S rats showed no change in urinary kallikrein even when treated with 10 mg of DOC/day for 24 days.

(Na+,K+)-activated adenosinetriphosphatase and hypertension in DAHL salt- sensitive and -resistant rats.

(Na+,K+)-ATPase activity was compared in Dahl salt-sensitive (S) and salt-resistant (R) rats. When S and R rats were maintained on 1% NaCl diet their blood pressures at 5 weeks of age were similar and their renal microsomal (Na+,K+)-ATPase activities were also similar. At 6 months of age, on 1% NaCl diet, S rats have markedly elevated blood pressure compared to R and renal microsomal (Na+,K+)-ATPase activity was suppressed in S compared to R.

Developmental patterns of blood pressure and urinary protein, kallikrein, and prostaglandin E2 in Dahl salt-hypertension-susceptible rats.

S and R female rats were raised on a 1% NaCl diet, and excretion rates of urinary protein, kallikrein esterase activity, and PGE2 were measured (1) at 1 1/2 months of age, when both S and R rats were normotensive, (2) at 3 months of age, when S rats were mildly hypertensive and R controls remained normotensive, and (3) at 6 months of age, when S rats were markedly hypertensive relative to the still normotensive R rats. Urinary protein excretion rate in S compared to R rats was slightly elevated at 1 1/2 months of age and greatly elevated at 3 and 6 months of age. Urinary kallikrein was measured by hydrolysis of TAME after separation of kallikrein from nonkallikrein TAME esterases on DEAE-Sephadex minicolumns.

Evidence for an androgen-dependent urinary arginine esterase in the rat: separation from other urinary arginine esterases including kallikrein.

DEAE-Sephadex chromatography of male rat urine resolved three peaks of arginine esterase activity using the synthetic substrate alpha-N-p-tosyl-L-arginine methyl ester . HCl (Tos-Arg-O-Me). Esterase activity in peak 1 (esterase A1 fraction) was present in sexually mature males, but it was not found in mature females, castrated mature males, or sexually immature males.

Effects of rat urinary arginine esterases on rat kidney to release renin.

Urinary kallikrein has been reported to activate human plasma inactive renin. Our previous report suggests that rat urinary kallikrein releases active renin from rat renal cortical slices. Recently, McPartland et al.

Effects of dexamethasone on excretion of urinary kallikrein and urinary protein in Dahl salt-sensitive and salt-resistant rats.

The effect of glucocorticoid treatment on urinary kallikrein excretion was assessed in Dahl salt-hypertension susceptible (S) and salt-hypertension resistant (R) rats. A single dose of dexamethasone (100 micrograms) caused a marked water diuresis and a slight decrease in urinary kallikrein excretion in both S and R rats. A single dose of dexamethasone also caused the S rat to excrete massive amounts of protein into the urine, almost 3-fold higher than S rats treated with oil; the effect on R rat urinary protein was similar, but less severe.

A qualitative difference in plasma renin activity in Dahl rats susceptible or resistant to salt-induced hypertension.

Plasma renin activity (PRA) was studied in the rats bred by Dahl for susceptibility (S-strain) or resistance (R-strain) to salt (NaCl) induced hypertension. The pH curves for PRA had different shapes. The difference in shape of the pH curves was reflected in the ratio of PRA pH 8/PRA pH 6.

Total and kallikrein arginine esterase activities in the urine of salt-hypertensive susceptible and resistant rats.

Urinary enzymes that hydrolyze the artificial substrate alpha-N-p-tosyl-L-arginine methyl ester (TAME) were studied in Dahl salt-sensitive (S) and salt-resistant (R) rats. Total urinary TAME esterase activity (kallikrein and non-kallikrein) showed a marked increase with dialysis against water, but only in hypertensive S rats with proteinuria. This phenomenon suggests the presence of dialyzable TAME esterase inhibitor(s) in urine following renal damage, but these data do not define what urinary esterases might be affected.

Cooperative effects of CTP on calf liver CTP synthetase.

In all previous kinetics studies of calf liver CTP synthetase, simple Michaelis-Menten hyperbolic plots were obtained. In this study it was shown that calf liver CTP synthetase could generate sigmoidal kinetic plots as a function of the substrate UTP when in the presence of the product of the reaction, CTP. The Hill number was estimated to be 2.

An automated analysis of REM sleep in primary depression.

The REM sleep of 23 nonpsychotic patients with primary depression was studied by means of an automated REM analyzer during a drug-free period and again during amitriptyline administration. Initial drug administration (50 mg) was associated with an immediate reduction in the number, average frequency, and average size of the rapid eye movements. The average REM size remained suppressed with continued drug administration while the average REM frequency showed a rebound which was responsible for a partial recovery of the number of REMs and total REM intensity to predrug levels.

Albumin-like proteins from the pituitary glands of Dahl salt-resistant rats.

Dahl selectively bred rats for susceptibility (S strain) or resistance (R strain) to the hypertensive effect of high salt (NaCl) diet. Pituitary glands of R rats accumulate large amounts of four unique proteins not seen in S rats. These proteins were called R1, R2, R3, and R4 in order of decreasing electrophoretic mobility.

The relationship between wrist-monitored motor activity and serum CPK activity in psychiatric in-patients.

Motor activity, monitored by a wrist motion transducer, was related to serum CPK activity the following morning in a group of psychiatric in-patients. In 4 of 10 patients, studied for periods exceeding one week, total 24-hour activity was significantly correlated with morning serum CPK activity. Motor activity during the night was unrelated to serum CPK activity.

EEG sleep in primary depression. A longitudinal placebo study.

Characteristic EEG sleep changes in depression are highlighted by a sleep continuity disturbance, delta sleep reduction, and a shortened REM latency. Since these findings have been derived primarily from only a few baseline recordings, questions regarding their persistence and/or variability have not been previously addressed. As part of an extensive set of investigations of EEG sleep in depression, we examined nightly the sleep of 12 hospitalized, non-delusional, primary depressives who were involved in a program of active psychosocial treatment intervention and received only placebo during a 5-week study period.

An objective measure of physical activity for epidemiologic research.

The development of a device is reported called the Large-scale integrated Motor Activity Monitor to examine physical activity during individuals' normal daily lives. The unit which is slightly larger than a wrist watch records body movement when worn at various body locations. Two population studies were conducted to evaluate the units.

Computerised measures of electro-oculographic activity during sleep.

Since electro-oculographic (EOG) activity during human sleep appears to be of medical diagnostic and prognostic value, the vast amount of EOG data representative of even a single night's sleep warrants the development of automated pattern recognition and information extraction techniques. Such a technique for the analysis of sleep EOG rapid eye movement (REM) is presented in which the time of occurrence, area, height, duration and binocular symphrony for each REM are measured. This automated technique for sleep EOG analysis is currently used in the investigation of periodicities and values of REM parameters for normal subjects and in the differential diagnosis of affective disorders.

Rapid eye movement sleep cycle, clock time and sleep onset.

The phase of the REM sleep rhythm was studied in 10 normal subjects each of whom was sleep studied for 4 consecutive nights. For analysis, each night of sleep was aligned according to clock time and each minute was scored as REM or non-REM. With these data, REM probability was found as a function of clock time.

REM sleep in primary depression: a computerized analysis.

REM sleep in 35 inpatients with primary depression was automatically analyzed for 7 consecutive nights during placebo administration. For the total night of sleep, as well as each individual REM period, the number of REMs, their total voltage integral over time, the sum of their durations and the average REM size were automatically calculated. Validity of these automated REM measures was established by significant correlations with manually scored REM measures.