Search PubMed⌕ Search

Biomedical subjects

K Iijima

Publications and source records attributed to K Iijima.

At least 253 records · Page 14Linked to original sources
PubMed1988

A sensitive radioimmunoassay for circulating alpha-interferon in the plasma of healthy children and patients with measles virus infection.

The mean circulating alpha-interferon of healthy children aged 2 to 13.5 yrs as measured by a radioimmunoassay was 0.119 +/- 0.031 ng/ml, which was significantly lower than that of young adults. Circulating alpha-interferon of children with measles virus infection aged 1 to 11 yrs, on their first visit to the hospital when they were fully symptomatic, was 0.095 +/- 0.035 ng/ml (n = 39). It was 0.105 +/- 0.070 ng/ml (n = 21) on their second visit, 7 to 10 days after their first visit when the patients were convalescent. The difference was statistically insignificant. It is concluded that immunoreactive circulating alpha-interferon is low in children and reaches maximum level in young adults, subsequently declining gradually with age. Immunoreactive circulating alpha-interferon, a possible reflection of endogenous alpha-interferon, does not change significantly by the infection of measles virus.

Acute Disease↗
PubMed1988

Benign familial hematuria.

Fifty children had benign familial hematuria. They were from 43 families showing neither deafness, heavy proteinuria, nor chronic renal failure and had a nonprogressive course. Light microscopy of renal biopsy specimens showed little or no glomerular changes. Immunofluorescence showed no significant glomerular deposits of immunoglobulins or complement components, but deposition of C3 in the arteriolar walls was observed in 21 of the 39 patients examined. Electron microscopy demonstrated widespread attenuation of the glomerular basement membrane (GBM) in 19 patients, focal attenuation in 22, and normal GBM in nine. These observations suggest that patients with benign familial hematuria are heterogeneous and that the thin GBM may be related to hematuria.

Basement Membrane↗
PubMed1987

Mesangial changes in IgA nephropathy in children.

The mesangial changes in 92 renal biopsy specimens from 81 children with IgA nephropathy were correlated with the clinical and the other renal biopsy findings. Three types of mesangial changes were identified: mesangial hypercellularity was predominant compared with the increase in matrix in 34 biopsy specimens (type A), the degrees of mesangial hypercellularity and matrix increase were similar in 36 (type B) and matrix increase was predominant in 22 (type C). The interval between the onset of disease and biopsy was significantly shorter in biopsies with type A mesangial changes (P less than 0.01) and significantly longer in those with type C (P less than 0.01). Serial pathologic observations revealed that predominant mesangial hypercellularity was almost exclusively seen in the initial biopsy but predominant matrix increase was usually seen in the follow-up biopsy. The percentage of glomeruli showing sclerosis was significantly higher in biopsies with type C mesangial changes (P less than 0.05). At the latest follow-up, 58% of the patients showing type A and 57% showing type B lost their proteinuria, whereas only 9% showing type C lost their proteinuria (P less than 0.01). These findings suggest that predominant mesangial hypercellularity is characteristic of the early lesion of childhood IgA nephropathy, and progression of disease leads to gradual decrease of mesangial cellularity and increase of matrix with sclerosis.

Biopsy↗
PubMed1987

Immunohistochemical studies on GABAergic neurons in the rat locus coeruleus, with special reference to their relationship to astrocytes.

Purified antisera against GABA were prepared. A few small GABAergic neurons in the rat locus coeruleus were immunohistochemically demonstrated by both the unlabeled peroxidase-antiperoxidase method and the avidin-biotin peroxidase complex method using affinity-purified GABA antibodies. The glial fibrillary acidic protein immunoreactivity in this nucleus was localized by the latter method in the astrocytal framework encircling medium-sized and small neurons as well as in straight processes. Astrocytes may play a role as energy donors to these neurons.

Animals↗
PubMed1987

Paroxysmal kinesigenic choreoathetosis and paroxysmal dystonic choreoathetosis in a patient with familial idiopathic hypoparathyroidism.

A patient with familial idiopathic hypoparathyroidism whose major symptoms were paroxysmal kinesigenic choreoathetosis (PKC) and paroxysmal dystonic choreoathetosis (PDC) was reported. CT revealed marked calcification in the basal ganglia, the thalamus and the dentate nucleus of cerebellum. Positron emission tomographic (PET) study showed decreased glucose metabolism in the basal ganglia and thalamus. The paroxysms were eliminated by the normalization of serum calcium level. Thus the paroxysms seemed to be induced by hypocalcemia which stimulated the lesions in the basal ganglia and thalamus, on one occasion, as in PKC, and on the other occasion, as in PDC. Concomitant occurrence of both PKC and PDC in a patient is unique and is of interest in considering the pathomechanisms of these different but related disorders.

Adult↗
PubMed1987

Macroscopic hematuria in childhood IgA nephropathy.

The clinical presentation, initial laboratory and renal biopsy findings, and subsequent clinical course in 205 children with IgA nephropathy were studied retrospectively. The findings in the 119 patients with macroscopic hematuria and those in the 86 without macroscopic hematuria were compared. There were no differences with regard to sex distribution, age at onset, initial renal function, incidence of hypertension, degree of proteinuria and degree of mesangial proliferation. At the latest follow-up, 3% of the patients with macroscopic hematuria and 8% without macroscopic hematuria had developed chronic renal failure; 8% of the patients with macroscopic hematuria and 20% without had heavy proteinuria with or without hypertension (p less than 0.01); 41% of the patients with macroscopic hematuria and 24% without macroscopic hematuria had normal urine, blood pressure and GFR (p less than 0.05). The disease appears to follow a significantly more benign course in children with macroscopic hematuria than in those without macroscopic hematuria. These observations suggest some macroscopic hematuria-related differences in the natural history of childhood IgA nephropathy.

Child↗
PubMed1987

[An experimental study on the pathogenesis of congenital hand malformations--with reference to local disturbance in the limb bud and polydactyly].

Pathogenetic conditions for polydactyly and its pathogenesis were studied by inducing the condition at a high incidence by incubating fertilized ova of white leghorns and locally cauterizing the limb bud with a bipolar microcoagulator. Polydactyly commonly occurred in about 12 hours of the latter half of the third day after cauterization (5 watts) of the preaxial area of the limb bud. This suggests the involvement of space- and time-specificity under the appropriate strength of such stimulation in the pathogenesis of polydactyly. Most polydactyly involved the first toe. Disturbance in the primordium of the metatarsal bone was believed to be related to the pathogenesis. Many reductive complex malformations resembling polydactyly were seen, and the repairing mechanism of these malformations was similar to that of polydactyly. Thus, it seems that the repairing mechanism is oriented to acquiring the proper number of toes and that acquisition of the first toe becomes particularly dominant, resulting in a tendency for polydactyly in the first toe.

Animals↗
PubMed1986

Cell-stage dependence of mutagen-induced sister-chromatid exchanges in human lymphocyte cultures.

The induction of sister-chromatid exchanges (SCEs) was studied in phytohemagglutinin (PHA)-stimulated human lymphocytes exposed for 1 h to mitomycin C (MMC, 3 X 10(-6) M), ethyl methanesulphonate (EMS, 2 X 10(-2) M), or 4-nitroquinoline-1-oxide (4NQO, 3 X 10(-5) M) at various cell-cycle stages of 72-h cultures. The doses of the chemical were chosen to give about 20 SCEs per cell when treated at Go. The SCE frequency increased almost linearly with MMC or EMS treatments at later times after PHA stimulation, peaking with those at 36 h (at around the first G1/S boundary in the 2 consecutive cell cycles, which was revealed by concomitant experiments), and then decreased with subsequent treatment times. Cell-cycle kinetics and the cell stages at which the cells were treated were measured by autoradiography and sister-chromatid differential staining. The data show that MMC and EMS produce larger numbers of SCEs when treated at stages closer to the beginning of S, and that the most efficient time of treatment is the G1/S boundary in the first cell cycle of the two consecutive cycles before sampling. Pulse treatment with EMS caused about 3 times larger inductions of SCEs when done at late G1/early S(G1/S boundary) in the first cell cycle compared to that at G0/early G1, whereas identical exposure to MMC at the first G1/S boundary produced only 1.5 times larger numbers of SCEs than that at G0/early G1. EMS and MMC both, however, induced 30-40% larger numbers of SCEs when treated at the G1/S boundary in the first cell cycle than when treated at the second cell cycle before sampling. On the contrary, treatment with 4NQO led to the induction of about the same numbers of SCEs even when treated at different cell-cycle stages before the second G1/S boundary. The SCE frequency in 4NQO-treated cells then decreased with subsequent treatment times.

4-Nitroquinoline-1-oxide↗
PubMed1986

4-aminobutyrate: 2-oxoglutarate transaminase-containing neurons in the perinuclear zone of the rat supraoptic nucleus.

A pharmaco-histochemical method for demonstrating the enzyme 4-aminobutyrate: 2-oxoglutarate transaminase was applied to the sections of the rat supraoptic nucleus region. The reactions of GABAergic interneurons and their relationship to neurosecretory neurons were studied. Medium-sized neurons heavily stained for transaminase were detected in the perinuclear zone just dorsal to the supraoptic nucleus. Neurons within the supraoptic nucleus were not stained. However, the perikarya of some neurosecretory neurons in the dorsal region of the supraoptic nucleus, as well as in discrete groups scattered throughout the nucleus; were surrounded by the granular reaction products. The results strongly suggest that these strongly positive neurons in the perinuclear zone send axons to the supraoptic nucleus, where they richly divide into many branches, which synapse on the perikarya of some vasopressin and oxytocin cells.

4-Aminobutyrate Transaminase↗