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Biomedical subjects

M Fukase

Publications and source records attributed to M Fukase.

At least 163 records · Page 9Linked to original sources
PubMed1985

Additive effects of parathyroid hormone and calcitonin on adenosine 3',5'-monophosphate release in newly established perfusion system of rat femur.

A new perfusion system of isolated rat femora was established, and the effect of PTH or calcitonin (CT) on cAMP release from the adult bone was examined. Stimulation of cAMP release from the isolated perfused bone peaked rapidly between 5 and 10 min after human PTH (hPTH)-(1-34) or eel CT injection, respectively, and declined gradually toward the preinjection level. However CT exhibited a longer lived effect than PTH. Release of cAMP was still significantly greater than control at 60 min after a bolus injection of CT. The rate of cAMP release was directly related to the dose of PTH or CT. H2O2-oxidized PTH (biologically inactive) caused no increase in cAMP release. hPTH-(1-34) was markedly more potent than hPTH-(1-84) in stimulating cAMP release from the perfused bone on an equimolar basis. Simultaneous administration of 5 micrograms PTH and 5 micrograms CT at maximal stimulatory doses produced additive effects, indicating the presence of separate receptor sites for PTH and CT in the bone. In conclusion, this system provides us a means by which hormone actions on adult bone with integrity of the organ can be evaluated and therefore makes possible systemic investigation of the osteoblast-osteoclast function.

Animals↗
PubMed1985

Difference in arginine vasopressin responsive cAMP production between apical and basolateral membrane of cultured renal epithelial cells (MDCK).

It has been reported that vasopressin (AVP)-sensitive renal epithelial cell line (MDCK) forms morphologically polarized monolayers when cultured on plates. We studied whether the AVP-responsive cAMP production system would be located solely on the basolateral surface of these cells as has already been shown on the renal tubules. We used two methods to overcome the inaccessibility to the basolateral surface of the cultured cell layer and to study the apical and basolateral surfaces separately. One was culture on collagen sheet and the other was on Millipore filters. Our experiments showed that MDCK cell increased adenosine 3':5'-cyclic monophosphate (cAMP) content prominently only when vasopressin was accessible to the basolateral surface. Accordingly, MDCK cells were shown to have the AVP-responsive cAMP production system predominantly on the basolateral surface of the cell membrane.

Animals↗
PubMed1985

Calcitonin-responsive clonal cell line from porcine kidney (PK(15)) in serum-free medium.

PK(15), a homogeneous epithelial cell line from porcine kidney which was originally established through single cell cloning from PK-2a, was found to respond to [Asu1,7]eel calcitonin with an increase in adenosine 3':5'-cyclic monophosphate (cAMP) content, but do not respond to parathyroid hormone or arginine vasopressin. These cells were able to grow in a synthetic medium (a 1:1 mixture of Dulbecco's modified Eagle's MEM and Ham's F12 medium) without any supplementary factor. The medium supplemented with selenous acid, transferrin, and insulin permitted a growth rate equivalent to those in serum containing medium. When grown in the serum-free defined medium, these cells showed an increase in cAMP content in response to [Asu1,7]eel calcitonin to approximately the same degree as in the serum containing medium (10% fetal calf serum). Our present study first indicates that PK(15) cells are capable of growing in the serum-free defined medium retaining the calcitonin responsiveness of the original cells.

Alkaline Phosphatase↗
PubMed1985

Calcitonin stimulation of cyclic adenosine 3':5'-monophosphate production with growth inhibition in human renal adenocarcinoma cell lines.

Responsiveness of cyclic adenosine 3':5'-monophosphate (cAMP) to parathyroid hormone, calcitonin, and vasopressin was studied in six human renal adenocarcinoma cell lines. Four of six renal adenocarcinoma cell lines showed increased cAMP content in response to calcitonin while the other two did not. Neither parathyroid hormone nor vasopressin increased the concentration of cAMP in each of these cell lines. The growth rate of KU-2 cells, which responded to calcitonin with an increase of cAMP content, was inhibited by calcitonin. On the other hand the growth rate of calcitonin-nonsensitive KH-39 cells was unaltered. The growth inhibitory effect of the hormone on KU-2 cells could be considered to be mediated by the increased cAMP levels from the following results: (a) there was positive correlation between the cellular cAMP content and growth inhibition after various amounts of calcitonin addition; (b) KU-2 growth was also suppressed by N6,O2'-dibutyryl cAMP; and (c) a group of KU-2 cells which had become resistant to calcitonin-induced growth inhibition showed a diminished cAMP increase in response to calcitonin.

Adenocarcinoma↗
PubMed1984

[Standard procedure and the diagnostic criteria for the Ellsworth-Howard test using human PTH-(1-34)].

The present study was undertaken to establish a standard method to perform the Ellsworth-Howard test using human PTH-1-34). For this purpose we made a survey of literature concerning the Ellsworth-Howard test and then examined the data of the Ellsworth-Howard tests performed on 178 hypoparathyroid patients using human PTH-(1-34). The main items of investigation were: (i) to determine the appropriate dose of PTH for administration to adults and children; and (ii) to define the criteria of practical usefulness for the differential diagnosis of the types of hypoparathyroidism. From the analysis of the data, the following findings and conclusions were obtained. The dose of human PTH-(1-34) appropriate for diagnostic use is 100 U per person for adults and 100 U per body surface area of one square meter (100 U/m2) for children. The criteria of positive response in the Ellsworth-Howard test are defined as follows. a) phosphaturic response: (U4 + U5) - (U2 + U3) = more than 35 mg/2 h b) cyclic AMP response: U4 - U3 = more than 1 mumol/h, and U4/U3 = more than 10 times. In the above formula, U2 - U5 represent the urine samples collected hourly in order. PTH is injected at the time between U3 and U4. For the application of the criteria in children, one should use the values corrected for body surface area of one square meter. It is necessary to confirm the following conditions before the application of the criteria: the presence of hypocalcemia and hyperphosphatemia; the lack of phosphate deficiency (basal urinary phosphate excretion more than 10 mg/2 h); the accuracy of timed urine collections (ratio of creatinine excretion during 2 hours before PTH to that after PTH administration in the range from 0.8 to 1.2); and the absence of marked diurnal variation in phosphate excretion (difference in phosphate excretion between the two basal hourly urine less than 17.5 mg/h). To ensure the above conditions, medications such as phosphate-binding antacids should be withheld for at least 1 week before the test, and the test should be performed according to the standard procedure described in this paper. The diagnosis of pseudohypoparathyroidism Type II should be done cautiously. It is necessary to take account of the high basal urinary cyclic AMP excretion and the elevated serum PTH level along with the results of the Ellsworth-Howard test (positive cyclic AMP response and negative phosphaturic response) for a definite diagnosis of this entity.

Adolescent↗
PubMed1984

[Urinary phosphate and cyclic adenosine monophosphate response to intravenous administration of synthetic human parathyroid hormone-(1-34) in idiopathic hypoparathyroidism, pseudohypoparathyroidism, pseudopseudohypoparathyroidism and normal subjects].

The response to exogenous parathyroid hormone (PTH) with urinary excretion of phosphate and cyclic adenosine monophosphate (cAMP) was tested by the use of synthetic human parathyroid hormone (1-34) [hPTH-(1-34)] on 59 patients with hypocalcemia and normal or high serum inorganic phosphorus and normal renal function without a history of parathyroidectomy for differentiation between idiopathic hypoparathyroidism (IHP), pseudohypoparathyroidism (PHP) and related diseases along with 18 normal subjects. A positive phosphaturic response to exogenous PTH was defined as the increment of 2 hours phosphate excretion (delta P) of more than 35 mg. A positive urinary cAMP response to exogenous PTH was defined as the increment by more than 1 mumole per one hour (delta cAMP) and the increase of 1 hour excretion by more than 10 times. Increments of 2 hours urinary phosphate excretion in response to hPTH-(1-34) 100 units were 60.5 +/- 7.7 mg (mean +/- SEM) in 27 patients with IHP, 23.5 +/- 5.9 mg in 21 patients with PHP type I and 24.9 +/- 4.0 mg in 17 normal subjects. Increments of 1 hour urinary cAMP excretion in response to hPTH-(1-34) 100 units were 12.0 +/- 1.5 mumole in 27 patients with IHP, 0.33 +/- 0.10 mumole in patients with PHP type I and 23.6 +/- 5.8 mumole in 15 normal subjects. Ratios of 1 hour urinary cAMP excretion were 97 +/- 10 in 27 patients with IHP, 3.6 +/- 0.5 in 21 patients with PHP type I and 54 +/- 14 in 15 normal subjects. Positive phosphaturic and negative urinary cAMP response was encountered in 3 out of 21 patients with PHP type I in response to hPTH-(1-34). This exaggerated phosphaturic response should be considered as due to the influence of treatment with Ca or vitamin D derivatives.

Adolescent↗
PubMed1984

Vascular lesions in systemic lupus erythematosus (SLE) with pulmonary hypertension.

An autopsy case with SLE suffering from Raynaud's phenomenon and pulmonary hypertension was reported. Histological examinations revealed systemically marked fibrous intimal thickening of arteries and arterioles with or without thrombus throughout the whole body, especially of the pulmonary arteries and arterioles. Pulmonary arterial changes in the present case were compared with those in 52 autopsied cases with SLE without pulmonary hypertension, but there were no cases with such marked arterial changes as the present case. In addition, the incidence of pulmonary thrombosis was significantly higher in the cases with Raynaud's phenomenon than the cases without this phenomenon. However, the relation between pulmonary hypertension and Raynaud's phenomenon, pulmonary thrombosis, fibrous pericarditis, or type of lupus nephritis in SLE could not be clarified with a significant difference.

Adult↗
PubMed1984

Abnormal regulation of 25-hydroxyvitamin D3-1 alpha-hydroxylase activity by calcium and calcitonin in renal cortex from hypophosphatemic (Hyp) mice.

25-Hydroxyvitamin D3-1 alpha-hydroxylase activity was assayed in primary serum-free monolayer tissue culture of renal cortical cells from hypophosphatemic (Hyp) mice and normal litter mates. Morphological and growth characteristics of cells from the two genotypes were indistinguishable. Basal enzyme activity was not significantly different in either type of cell over a wide range of substrate concentration. The enzyme from both genotypes was stimulated by PTH and suppressed by increased phosphate concentration in the culture medium. Whereas 1 alpha-hydroxylase activity in cells from normal mice was increased in low calcium medium and suppressed in high calcium medium, the enzyme in cells from Hyp mice was not altered by similar changes in the medium calcium concentration. Salmon calcitonin caused a significant increase in 1 alpha-hydroxylase in cells from normal mice, but did not stimulate enzyme activity in cells from Hyp mice. These studies indicate that control of 1 alpha-hydroxylase activity is abnormal in renal cortical cells from Hyp mice. Impaired control of this enzyme could result in the inappropriately low circulating concentrations of 1,25-dihydroxyvitamin D3 that have been observed in humans with hypophosphatemic rickets and in the relatively low activity of 1 alpha-hydroxylase in renal cortical homogenates of Hyp mice compared to that in normal mice on a low phosphate diet.

25-Hydroxyvitamin D3 1-alpha-Hydroxylase↗
PubMed1983

Basic and clinical evaluation of the measurement of bone resonant frequency.

A new computerized apparatus was constructed to measure the resonant frequency of human ulna in vivo with high sensitivity and reproducibility. Experimental studies using aluminum bar and dried human bone revealed the importance of the ulna being positioned parallel to the radius, approximately 90 degree flexion of the elbow joint, and minimal muscle activity in order to demonstrate maximum resonant frequency of ulna. Measurement of bone resonance in monkeys in vivo and after removal of the bone in vitro showed good agreement. Product of F (maximum resonant frequency in Hz) and L (ulnar length in cm), FL, indicating the speed of propagation of sound wave through the ulna, showed a significant positive correlation with bone mineral content/bone width (BM/BW) measured by Norland-Cameron apparatus and age-bound decline in both sexes. Patients with osteomalacia and primary hyperparathyroid bone disease tended to have higher FL values than expected from BM/BW. Two-dimensional display of FL and BM/BW thus appears to be useful in distinguishing osteoporosis from osteomalacia better than the use of BM/BW alone.

Adolescent↗
PubMed1982

Renal failure caused by retroperitoneal involvement of Hodgkin's disease of the lymphocyte-depletion type.

The paper presents the case of a man with non-functioning unilateral kidney due to retroperitoneal and renal lymph node involvement of Hodgkin's disease, which we interpreted as unilateral renal pelvic tumor. The disease had progressed rapidly to its termination and renal failure in addition to cachexia developed. Nephrostomy on the tumor-uninvolved side had failed to restore renal function and the patient died 3 days after surgery. The study concerns the lack of clinical entity of the nephrotic syndrome even in the absence of glomerulonephropathy often described in the literature dealing with Hodgkin's disease.

Acute Kidney Injury↗
PubMed1982

Studies of immune functions of patients with systemic lupus erythematosus: antibodies to desialized, rather than intact, T cells preferentially bind to and eliminate suppressor effector T cells.

Patients with systemic lupus erythematosus (SLE) were found to have in their plasma antibodies specific for desialized T cells. Adsorption studies with intact or desialized T cells indicated that SLE anti-T cell antibodies consisted of two populations with different target cell specificities, one capable of recognizing unique determinants on desialized T cells and another able to bind to both intact and desialized T cells. Normal T cells did not remove the antibodies specific for desialized T cells. moreover, the antibodies to desialized T cells were not removed by adsorption with either desialized non-T cells or desialized erythrocytes. Thus, the antibodies to desialized T cells recognize a determinant that is unique to a T cell subset and also includes a sugar. Inhibition studies with various sugars indicated that lactose was the most potent inhibitor of antibody binding. The anti-desialized T cell antibody appears to recognize a T cell determinant which includes lactose, probably in the form of a beta-galactosyl residue, but which also includes additional T cell determinants. The antibodies to desialized T cells were found to bind preferentially to concanavalin A-induced autorosetting T cells, which had been already demonstrated to contain suppressor effector cells. Indeed, such antibodies were effective in eliminating suppressor effector function without interfering with T cells necessary for such activation (such as precursor or inducer cells). Finally, studies of patients with SLE yielded a highly significant correlation (r = 0.92) between impaired suppressor effector function of their cells and the presence of antibodies to desialized T cells in their plasma.

Antibody Specificity↗