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Biomedical subjects

T Minami

Publications and source records attributed to T Minami.

At least 91 records · Page 5Linked to original sources
PubMed2000

Accumulation of calcium and phosphorus in the mitral valve in comparison with the abdominal aorta and the scaphoid bone.

To clarify why calcification of the mitral valve occurred, the authors chose the abdominal aorta and the scaphoid bone among many arteries and bones, and they studied both relationships in element contents between the mitral valve and the abdominal aorta and between the mitral valve and the scaphoid bone. The subjects consisted of 11 men and 8 women, ranging in age from 52 to 96 yr. The accumulation of calcium and phosphorus occurred progressively with aging in the mitral valve, whereas it became the highest in the sixties in the abdominal aorta and did not increase thereafter. The accumulation of calcium and phosphorus occurred in the abdominal aorta earlier than the thoracic aorta, in which it became remarkable in the seventies. It should be noted that in regard to the accumulation of calcium and phosphorus, no significant correlations were found between the mitral valve and the abdominal aorta. It is suggested that calcification of the abdominal aorta is not essentially accompanied by calcification of the mitral valve. The scaphoid bone was chosen among many bones consisting mainly of spongy bone and the relationship was examined between the calcium content in the mitral valve and the bone mineral density of the scaphoid bone. It was found that there was a low relationship between them. Therefore, it is suggested that a part of the surplus calcium released from bones is deposited in the mitral valve.

Aged↗
PubMed2000

Differences in accumulation of elements in human cardiac valves.

To elucidate changes of human cardiac valves with aging, the authors determined age-related changes of element contents in the four human cardiac valves by inductively coupled plasma-atomic emission spectrometry and attempted to examine the relationships in the element contents among the four cardiac valves. The subjects consisted of 10 men and 15 women, ranging in age from 65 to 102 yr. The accumulation of calcium and phosphorus was the highest in the aortic valve, and decreased in the order mitral, pulmonary, and tricuspid valves. The contents of calcium and phosphorus in the aortic valves corresponded to about 12 and 19 times the amounts of those in the tricuspid valves, in which the contents were very low. The contents of calcium and phosphorus in the aortic valves were about 2.5-fold the amounts of those in the mitral valves. An examination was attempted to determine whether or not there were relationships in element contents among the four cardiac valves. As for the aortic and mitral valves, there were no relationships in the contents of calcium and phosphorus between them, but there were relationships in the contents of sulfur and magnesium between them. Three out of 24 cases contained high contents of calcium and phosphorus in both the mitral and aortic valves, whereas 16 out of 24 cases contained high contents of calcium and phosphorus in the aortic valves alone, without the high contents in the mitral valves. Likewise, there were no relationships in the element contents, such as calcium, phosphorus, sulfur, and magnesium, between the mitral and pulmonary valves or between the mitral and tricuspid valves. It is suggested that the accumulation of calcium and phosphorus in the cardiac valve occurs independent of the other cardiac valves.

Aged↗
PubMed2000

Age-related variations of elements as compared among optic, radial, and sciatic nerves.

To elucidate changes of peripheral nerves with aging, the authors studied age-related changes of element contents in the optic, radial, and sciatic nerves by inductively coupled plasma-atomic emission spectrometry. The subjects consisted of seven men and seven women, ranging in age from 61 to 97 yr. The contents of phosphorus and sulfur remained constant through ages 61 to 97 yr in three nerves, the optic, radial, and sciatic nerves. It was found that there were age-related differences in calcium content among the optic, radial, and sciatic nerves: The calcium content of the optic nerve increased progressively with aging; in the radial nerve, it was hardly changed with aging; in contrast, the calcium content of the sciatic nerve decreased gradually with aging. In addition, it was found that in the radial nerve there were moderate correlations between age and zinc or sodium content, whereas significant correlations between age and the content of silicon or iron were found in the sciatic nerve. Furthermore, there was a correlation between the silicon and iron contents in the sciatic nerves.

Aged↗
PubMed2000

Age-dependent changes of elements in human trachea.

To elucidate compositional changes of human trachea by aging, element contents in tracheae were determined by inductively coupled plasma-atomic emission spectrometry. The subjects consisted of seven men and seven women, ranging in age from 61 to 97 yr. The sulfur content of the tracheae decreased gradually with aging. In regard to calcium and phosphorus, both the contents increased to about threefold amounts in their seventies compared with those in their sixties, and decreased thereafter. The contents of calcium and phosphorus were the highest in their seventies. Therefore, it is likely that surplus calcium released from bones is deposited temporally in the trachea, and the deposits are released from the trachea at older age. Based on our results of human cartilages, there are two types in regard to calcium accumulation: The first type is that calcium accumulation occurs progressively with aging; the second one is that calcium accumulation becomes the highest in the seventies or eighties, and decreases thereafter. Therefore, the trachea belongs to the second type. Furthermore, the magnesium content remained constant through the age range.

Aged↗
PubMed2000

Possible contaminant origins of the red cosmetics decorating ancient burial sites in Japan.

Marker elements were estimated from the red cosmetics collected from different ancient burials and mine ruins in three separate districts of Japan. Element levels were displayed in reference to the relative amount to sulfur (RA/S), by which the cosmetics were divided into five types: I--a low Hg/S with a low Fe/S; II--both moderate Hg/S and Fe/S; III--a moderate Hg/S with a high Fe/S; III 2--a high Hg/S with a moderate Fe/S; IV--a high Hg/S with a high Fe/S. The cosmetics can be further characterized by referring to other contaminants such as Zn, Cu, and Mn. These combined analyses with contaminant metals were capable of characterizing the origins of the cosmetics; it is useful to compare them to each other. The cosmetics were identified as being due to several groups of contaminants from ancient mines in Japan, and also with this system analysis of the markers it is possible to identify them from neighboring countries.

Archaeology↗
PubMed2000

Differences in the mineral contents between falx cerebri and tentorium cerebelli.

To elucidate age-related changes of the dura mater, the authors investigated age-related changes of mineral contents in the falx cerebri and the tentorium cerebelli by inductively coupled plasma-atomic emission spectrometry. The subjects consisted of 10 men and 15 women, ranging in age from 65 to 102 yr. The contents of calcium, phosphorus, and magnesium increased progressively with aging in the falx cerebri, whereas the contents of sulfur, iron, and zinc remained constant, being independent of age. In regard to the tentorium cerebelli, the contents of calcium, phosphorus, and magnesium seemed to increase progressively with aging, but the contents of sulfur, iron, and zinc hardly changed with aging. It was noteworthy that there were no significant relationships between the falx cerebri and the tentorium cerebelli in such element contents as calcium, phosphorus, magnesium, sulfur, iron, and zinc.

Aged↗
PubMed2000

Collaborative work to evaluate toxicity on male reproductive organs by repeated dose studies in rats 13). Effects of a single oral dose of cyclophosphamide.

As part of a collaborative effort to evaluate whether effects on male reproductive organs of chemicals can be detected within two-week in toxicity studies, eight-week-old male Sprague-Dawley rats were given a single oral administration of 100 mg/kg of Cyclophosphamide (Cp), and sacrificed at 1, 3, 7 and 14 days thereafter. The numbers of seminiferous epithelial cells were counted in the seminiferous tubules of stages II-III, V, VII and XII of the spermatogenic cycle. Animals showed decreased spermatogonia at Day 3, decreased spermatogonia and preleptotene spermatocytes at Day 7, and decreased spermatogonia and zygotene spermatocytes at Day 14. We also detected decrease of zygotene spermatocytes on careful routine/traditional histopathological examination at Day 14. These results suggest that the testicular toxicity of Cp can be detected within two weeks after treatment with a sufficient dose in rats.

Administration, Oral↗
PubMed2000

Effect of intrathecal nocistatin on the formalin-induced pain in mice versus that of nociceptin/orphanin FQ.

The effect of intrathecal nocistatin on formalin-induced pain in mice was investigated and compared with that of nociceptin/orphanin FQ (Noc/OFQ) to get information on the functional relationship between nocistatin and Noc/OFQ in the spinal cord. Subcutaneous injection of formalin into the hindpaw induced biphasic pain behaviors. Nocistatin, 1 pg, given intrathecally 1 min before 2% formalin injection, significantly attenuated the first phase of the formalin-induced pain. Also, 10 to 1000 pg of nocistatin, given 10 min after formalin injection, significantly inhibited the second phase of the formalin test. Naloxone, 5 mg/kg i.p., failed to antagonize inhibitory effects of nocistatin on either phase of the formalin-induced pain, indicating that analgesic effects of nocistatin were unrelated to the classic opioid system. At 1 to 100 pg, Noc/OFQ exerted no influence on either phase of the 2% formalin-induced pain. However, at 1% formalin, Noc/OFQ significantly aggravated the second phase at 10 pg but not the first phase at 1 to 1000 pg. This aggravating effect of Noc/OFQ was completely reversed by 10 pg of nocistatin. At 0.3 and 1 microg, Noc/OFQ, but not nocistatin, significantly inhibited both phases of the 2% formalin-induced pain. Suppressive effects of 1 microg of Noc/OFQ on the formalin-induced pain were not affected by 1 microg of nocistatin. These results suggest that Noc/OFQ might be involved in the second phase of the mouse formalin test and that, under such pathophysiological conditions, nocistatin could exhibit antagonism against Noc/OFQ at the spinal level.

Animals↗
PubMed2000

Lack of involvement of metallothionein expression in pancreatic carcinogenesis by N-nitrosobis (2-oxopropyl) amine in Syrian hamsters.

The possible involvement of metallothionein (MT) in pancreatic ductal carcinogenesis by N-nitrosobis(2-oxopropyl) amine (BOP) in hamsters was investigated. Hamsters received subcutaneous (s.c.) injections with dissolved BOP to 70 mg/kg body weight (BW) followed 7 days later by 20 mg/kg BW BOP and they were sacrificed at 4, 11, 16 and 27 weeks after the beginning of the experiment. MT expression was studied by immunohistochemistry and MT contents were assayed biochemically. Pancreatic ductal hyperplasias were developed from 11 weeks on and carcinomas from 16 weeks on, the incidence of the latter reaching 73% at the end of experiment. However, while normal appearing proliferating duct cells were sometimes positive, MT expression was not evident in hyperplasia (H), atypical hyperplasia (AH) or carcinoma (C), and MT contents did not significantly differ in pancreas of hamsters receiving saline or BOP at any time point. The results suggest that MT is not involved in pancreatic duct carcinogenesis. However, the presence of MT in proliferating ducts not related to carcinogenesis may suggest some unknown role for MT in cellular homeostasis.

Animals↗
PubMed2000

[Key issues in death at home].

After our facility was first opened, we provided terminal care for one patient with terminal stomach cancer. In this case palliative care, so important in terminal care, and care for the family was insufficient, and in the end we had to abandon the process assuring the kind of death the patient wished for at home. Learning from this experience, we have provided terminal care to about 150 patients based on each patient's outlook on life and view of life and death. These patients have included terminal cancer patients and patients informed of their cancer who chose to coexist with the cancer and live together with their families. At home, the words and facial expressions of the patients and their families are clear expressions of their humanity. At times, such, feelings are also directed frankly and unaffectedly toward us, the visiting nursing staff. When considering the early case in which we were unable to continue home care, we could see various problems: on the part of the medical staff including primary physician and nurses, the welfare service, the patient and family, and neighboring informal social resources. These included problems in informing the patient of his cancer and his remaining days. In home treatment of patients with terminal cancer, death at home assisted by a physician from the same medical facility is not emotionally all it might appear to be. Nurses, for example, do not provide religious comfort; therefore, they can not provide home hospice services. Or so it is said. However, in supporting community home care, there is an exchange between humans and the communication of genuine feelings; thus, the nurturing of warm care makes possible the kind of death the person wishes. In fact, we can not deny that that is the path we are taking. In the present report, we explore the issues that make home terminal care possible from the viewpoint of visiting nurses.

Attitude to Death↗
PubMed2000

[Right ureteral stenosis due to endometriosis occurring in the residual appendix: report of a case].

A 48-year-old female was found to have right flank pain at another hospital and transabdominal ultrasonography showed right hydronephrosis. She was referred to our department for further examination. She had undergone right oophorectomy and total hysterectomy 3 years before. Intravenous pyelography showed right hydronephrosis and retrograde pyelography revealed ureteral stenosis at the lower portion of the right ureter. Endometriosis had developed at the site of previous surgery on the appendix. A mass was formed in an extensive area including the endometriotic lesion, due to adhesion following previous surgery or other reasons, and extended to the retroperitoneum, thereby inducing right ureteral stenosis. The postoperative course was uneventful. The pathological diagnosis was endometriosis of the residual appendix.

Appendectomy↗
PubMed1999

Identification of metallothionein isoforms on capillary zone electrophoresis by adding anti-metallothionein antibody.

The aim of this study was to identify metallothionein (MT) isoforms in mouse liver by using capillary zone electrophoresis (CZE). Purified MT-1 and MT-2 isoforms were completely separated by CZE using a polyacrylamide-coated tube at physiologic pH. There were two peaks in the cytosol fraction prepared from zinc-injected mouse liver, in which the migration times corresponded with those of purified MT-1 and MT-2 isoforms. When anti-MT monoclonal antibody was added with the purified MT-1 or MT-2 solution, the peaks decreased. Furthermore, the two peaks in the cytosol prepared from Zn-injected mouse liver decreased in a time-dependent manner from the electropherogram after the addition of the antibody. Therefore, those peaks were identified as MT-1 and MT-2 isoforms, respectively. In conclusion, the addition of anti-MT monoclonal antibody to the cytosol fraction of tissues is an effective method for identification of MT isoforms after separation using CZE.

Animals↗
PubMed1999

Re-evaluation of sexual dimorphism in human corpus callosum.

To study the sexual dimorphism of human corpus cauosum (CC), we analyzed the midsaggital magnetic resonance imaging (MRI) morphometry in 67 adults aged (mean+/-s.d.) 36.82+/-9.35 years. Four specific angles of the CC were determined. All four angles in 34 females and 33 age-matched males showed a significant difference between females and males. These morphometric findings confirm a gender difference in the orientation of corpus callosum.

Adult↗
PubMed1999

Lack of tactile pain (allodynia) in lipocalin-type prostaglandin D synthase-deficient mice.

Prostaglandin (PG) D2 is the most abundant prostanoid produced in the central nervous system of mammals and has been implicated in the modulation of neural functions such as sleep induction, nociception, regulation of body temperature, and odor responses. We generated gene-knockout mice for lipocalin-type PGD2 synthase (L-PGDS) and found that the intrathecal administration of PGE2, an endogenous pain-producing substance, failed to elicit allodynia (touch-evoked pain), which is one typical phenomenon of neuropathic pain, whereas it evoked thermal hyperalgesia, in L-PGDS-/- mice. We also found that the allodynic response induced by the gamma-aminobutyric acid (GABA)A receptor antagonist bicuculline was selectively abolished in the L-PGDS-/- mice, among excitatory and inhibitory agents that induced allodynia in wild-type mice. Interestingly, simultaneous injection of a femtogram amount of PGD2 with PGE2 or bicuculline induced allodynia in L-PGDS-/- mice to the same extent as in wild-type mice. The PGE2- or bicuculline-evoked allodynia in wild-type and in PGD2-supplemented L-PGDS-/- mice was blocked by a PGD2 receptor antagonist given in a femtogram amount. These results reveal that endogenous PGD2 is essential for both PGE2- and bicuculline-induced allodynia.

Anesthesia↗
PubMed1999

Metallothionein does not protect mouse endocrine cells from damage induced by alloxan injection.

Effects of metallothionein (MT) on pancreatic endocrine cells of mice, injected with alloxan and at different zinc status were studied. Mice were given drinking water containing four different concentrations of zinc (0, 0.05, 0.1 or 0.5%) for 18 days, and alloxan was injected once on the 14th day. When zinc was added to the drinking water, pancreatic zinc and MT contents increased after injection of alloxan, but did not change with injection of vehicle alone, except in the group of mice drinking 0.5% zinc in water. However, plasma glucose level was increased in all the alloxan injected groups, and was independent of their zinc status. In mice given water with 0.5% of zinc, both pancreatic zinc and MT contents were higher than control mice given water alone. There was no difference in zinc and MT contents of the pancreas in mice drinking 0.5% zinc in groups injected with either alloxan or vehicle. The increase in plasma alpha-amylase activity, an indicator of pancreatic exocrine toxicity, was observed only in mice drinking water with 0.5% zinc after injection of both alloxan and vehicle. Histochemically, degranulation of zymogen and duct-like structures of exocrine cells and atrophy and disappearance of islet cells were observed in alloxan-injected mice drinking 0.5% zinc in water. The zymogen degranulation was observed on the vehicle-injected mice drinking 0.5% zinc in water. MT was immunohistochemically detected in the exocrine cells of both alloxan- and vehicle-injected mice given 0.5% zinc in water. No MT was detected in islet cells of mice in any group. The results show that an increase of zinc content may be followed by induction of MT synthesis in the pancreas of mice given increasing amounts of zinc in drinking water. However, MT dose not provide any protection against damage caused by alloxan to endocrine cells of the pancreas.

Alloxan↗
PubMed1999

A possible balance of magnesium accumulations among bone, cartilage, artery, and vein in single human individuals.

It is known that a large quantity of magnesium contains bones, and the magnesium contents in spongy bones decrease gradually with advancing age. To elucidate the relationships between a decrease of mineral contents in human bones and an accumulation of minerals in the other human tissues, the content of magnesium was analyzed by inductively coupled plasma-atomic emission spectrometry among human bones, arteries, veins, and cartilages in 27 subjects (17 men and 10 women). These were resected from the subjects who died in the age range 40-98 yr. Calcanei were chosen for analysis of magnesium contents in contrast with femoral, popliteal, and common carotid arteries, internal jugular and femoral veins, superior and inferior venae cavae, and pubic symphyses. The magnesium contents in the calcanei decreased gradually with aging, whereas they increased progressively in the arteries, veins, and pubic symphyses with aging. It was found that as the magnesium contents decreased in the calcanei, they increased in the arteries, such as the femoral, popliteal, and common carotid arteries, whereas they decreased inversely in the veins, such as the internal jugular and femoral veins and superior and inferior venae cavae. Furthermore, as the magnesium contents decreased in the calcanei, they hardly changed in the pubic symphyses. These suggest that magnesium released from bones is accompanied by accumulation of magnesium in the arteries.

Adult↗