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Biomedical subjects

H Doi

Publications and source records attributed to H Doi.

At least 271 records · Page 15Linked to original sources
PubMed1988

[Cerebral metastasis from malignant thymoma].

Thymoma with extrathoracic metastasis is very rare, especially to the central nervous system. As far as we know, this is the 15th reported case of cerebral metastasis from malignant thymoma. The prognosis is very poor and almost all of them die in one to one and half years. We have experienced such a case, who is 56 years old man, presenting Gerstmann's syndrome and right-hemiparesis 8 months later after thoracotomy for removal of thymoma. At the admission time in this hospital, CT findings proved the tumor in the left temporoparietal area, left ventricle deformity and slight midline shift to right side. The average of CT density in the low density area was 20. Peripheral region of the tumor was enhanced by contrast CT. Left carotid angiography showed the ACA shift to the right side and abnormal vascularity of peripheral branches of angular artery (arterial phase) and also tumor strain in late artery (arterial phase) and also tumor strain in late arterial phase. Brain scintigram revealed accumulation in the left parietal region. The rt-hemiparesis was rapidly going to be rt-hemiplegia. Therefore, we have performed needle puncture to prevent rt-hemiplegia at the first time. In the course of needle puncture, 90 ml of dark and red fluid was gained at 3.0 cm depth from the cerebral surface. Immediately, the above two symptoms have improved remarkably. Post operative CT showed the reduction of tumor and improvement of the midline shift. The radical operation have been done 2 days after the needle puncture. The tumor was elastic-soft and hemorrhagic and appeared dark-red.(ABSTRACT TRUNCATED AT 250 WORDS)

Brain Neoplasms↗
PubMed1987

Thymic stroma-derived T cell growth factor (TSTGF). I. Functional distinction of TSTGF from interleukins 2 and 4 and its preferential growth-promoting effect on helper T cell clones.

A recently established thymic stroma-derived cell line (TSCL) supported the growth of the interleukin (IL) 2-dependent, antigen-specific helper T cell (Th) clone, 9-16, without requirement for IL-2 and antigen, and such growth was substituted by a factor produced into cultures by this established TSCL. This substance, thymic stroma-derived T cell-growth factor (TSTGF), was capable of inducing the proliferation of various Th clones including 9-16 Th clone, but not of cytotoxic T cell clones. TSTGF-induced growth promotion was obtained in a dose-dependent fashion and in maintaining antigen specificity of Th clones. The culture supernatant from the TSCL did not contain detectable level of IL-1, IL-2, IL-3, IL-4, or interferon activity. The proliferation of 9-16 Th clone was stimulated by recombinant IL-2 and IL-4 as well as TSTGF, but not by IL-1, IL-3, or interferons. However, the proliferation of this Th clone by IL-2 or IL-4 was almost completely inhibited by anti-IL-2 receptor or anti-IL-4 monoclonal antibody, respectively, whereas TSTGF-induced growth of 9-16 Th clones was not affected by either type of antibody, demonstrating that TSTGF is functionally distinct from IL-2 and IL-4. In addition, TSTGF activity was also obtained from the culture supernatant of the primary thymic explant, which was freshly prepared. These results indicate that the primary thymic explant as well as an established TSCL produce factors capable of promoting the growth of helper but not cytotoxic type of T cells in the absence of T cell growth factors thus far defined.

Animals↗
PubMed1987

Milk-borne transmission of HTLV-I from carrier mothers to their children.

In order to clarify the natural transmission route of human T-cell leukemia virus type I (HTLV-I) from mother to child, we have followed two groups of children with ages of 1 to 3 years who were nourished either with HTLV-I-infected breast milk, or with non-infected milk from sero-positive, HTLV-I carrier mothers. Tests for the presence of antibody against HTLV-I revealed that 4 of 6 children in the former group developed HTLV-I infection, while only 1 of 14 children in the latter group became infected. The difference in HTLV-I infection rate for the children in the two groups was statistically significant (P less than 0.01 by chi-square). Furthermore, 2 of 4 elder siblings in the former group developed HTLV-I infection, whereas only one of 8 elder siblings in the latter group became infected. The overall rate of HTLV-I infection of breast-fed children born to HTLV-I-carrier mothers was 25% (8/32) by 3 years of age. Five of 6 mothers with HTLV-I-infected cells in the milk also possessed infected cells in their peripheral blood. Conversely 5 of 6 mothers without infected cells in the peripheral blood possessed no infected cells in their breast milk, suggesting that HTLV-I-infected cells in the peripheral blood can enter the breast milk. None of the 8 breast-fed children born to carrier mothers whose peripheral blood and breast milk-borne cells were negative, developed HTLV-I infection, suggesting that HTLV-I transmission from mother to child is dependent upon the number of HTLV-I-infected cells in carrier mothers.

Adult↗
PubMed1987

HTLV-I carrier mothers with high-titer antibody are at high risk as a source of infection.

High-titer antibody against HTLV-I in carrier mothers is proposed as a secondary parameter for risk of viral transmission to the children via milk. For titration of antibodies, a less expensive modified gelatin particle agglutination assay (approximately 40% of the standard cost) was developed. None of 11 carrier mothers with antibody titers of less than 4000 had carrier children, whereas 11 out of 17 mothers with titers of 256,000 or higher had carrier children. The antibody titer was correlated with antigen-bearing cells detectable in cultures of peripheral blood T-lymphocytes, which was previously described as a marker of risk for transferring HTLV-I to children.

Antibodies, Viral↗
PubMed1986

Significance of postnatal mother-to-child transmission of human T-lymphotropic virus type-I on the development of adult T-cell leukemia/lymphoma.

In order to shed light on the mode of HTLV-I infection by mother-to-child transmission, we examined sera of school children in a highly endemic town on two separate occasions at a 6-year interval. The carrier rates in ages 15-17, 8.7 and 2.1%, were significantly higher than that in ages 6-8, 1.7 and 0.4%, in studies. The latter survey showed a significantly lower carrier rate in each age group. Moreover, the carrier rates of those students born in 1965-1967 and 1968-1970 were stable in the interval. The data suggested that carrier rates of children at certain ages are reflected by the date of birth rather than by age. A prospective survey of children born of carrier mothers found the overall carrier rate to be approximately 25%, which did not increase with their age. There was no sexual difference in the carrier rate of children: 5/25 in male and 9/34 in females (X2 = 0.3). Carrier mothers could be separated into two groups: HTLV-I antigen-positive mothers and negative mothers. Nine out of 19 antigen-positive mothers (47%) and 2 of 19 antigen-negative mothers (11%) had carrier children (X2 = 6.3). Twelve of 30 children born of antigen-positive carrier mothers (40%) were carriers, in contrast to 2 of 24 children (8%) of antigen-negative mothers (X2 = 7.8). Furthermore, 12 of 14 carrier children (86%) were of antigen-positive mothers. This suggests that postnatal but early transmission of HTLV-I plays a significant role in the maintenance of HTLV-I endemy and the development of adult T-cell leukemia/lymphoma.

Adolescent↗
PubMed1986

Effect of feeding peptic digest of soy protein isolate on rat serum cholesterol.

Growing rats were fed ad libitum soy protein isolate (SPI) or its peptic (SPI-P) or tryptic digest (SPI-T) for a month and their sera were examined for cholesterol and triglyceride levels and enzyme activities such as cholinesterase, glutamate-pyruvate transaminase (GPT) and alkaline phosphatase. The rats fed SPI-P or SPI-T were inferior in growth to those fed SPI. Similarly, the serum glyceride level was lower in the SPI-P and SPI-T groups than in the SPI group. On the other hand, a significant difference was found in the serum cholesterol level between the SPI-P and SPI or SPI-T groups but not between the SPI and SPI-T groups. A similar tendency was observed for serum GPT and alkaline phosphatase activities, although there were no significant differences among dietary groups in small intestinal enzyme activities. As for the atherogenic index being a risk factor inducing atherosclerosis, the order of its value was SPI-P less than SPI less than SPI-T.

Alanine Transaminase↗
PubMed1986

[X-ray diagnosis of scirrhous carcinoma of the stomach].

To find a scirrhous carcinoma in its early stage, X-ray examination should pay more effort to detect a small erosion or II c like depressed lesion located in the fundic gland mucosa. In addition, radiographic signs of a malignant relief and a localized resistance to the gastric expansion at double contrast technique are also important. Three typical cases are illustrated.

Adenocarcinoma, Scirrhous↗