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Biomedical subjects

T Oka

Publications and source records attributed to T Oka.

At least 1,207 records · Page 67Linked to original sources
PubMed1985

[A case of multiple carcinomas of the colon and rectum associated with ulcerative colitis].

The present paper describes a patient with four independent carcinomas associated with ulcerative colitis. Subtotal colectomy with lymph node dissection was done on June 28, 1978. The operative specimen revealed a carcinoma at the descending colon, two independent cancerous lesions and papillary polyps at the sigmoid colon and a scirrhous, flat elevated neoplasm at the rectum. These carcinomas were surrounded by lesions of various degrees of epithelial dysplasia, suggesting precancerous change. Carcinomas and precancerous lesions were stained for carcinoembryonic antigen (CEA) by the CEA peroxidase antiperoxidase method, which is considered to be useful to discriminate precancerous change from an inflamed mucous membrane.

Adenocarcinoma↗
PubMed1985

Placental transfer of lidocaine and elimination from newborns following obstetrical epidural and pudendal anesthesia.

Following local anesthetic use, maternal and umbilical serum levels of lidocaine were determined at delivery by means of a gas-chromatography-mass-spectrometry technique in 13 cases. In six cases, where delivery was performed by cesarean section, lidocaine was used for epidural analgesia. The dose given averaged 4.0 +/- 1.7 mg/kg, and the time between analgesia and delivery was 22.0 +/- 4.5 minutes. The mean umbilical serum level of lidocaine was 1.19 +/- 0.79 micrograms/ml and that of the maternal serum was 2.18 +/- 1.25 micrograms/ml. The fetal to maternal ratio was 0.52 +/- 0.18. Lidocaine levels of neonatal plasma were followed at 3, 6, 12, and 24 hours after delivery, and the mean half-life was found to be 6.7 +/- 1.3 hours. In the other seven cases, lidocaine was given in normal vaginal delivery for pudendal nerve block, and the dose was as small as 0.79 +/- 0.06 mg/kg. The mean umbilical and maternal serum concentrations of lidocaine were 0.064 +/- 0.039 micrograms/ml and 0.143 +/- 0.071 micrograms/ml, respectively, and the ratio was 0.45 +/- 0.16. Lidocaine given to the mothers crossed to the fetuses readily and resulted in neonatal plasma levels that were half those of the mothers'. The elimination of lidocaine from the newborn after birth was prolonged so that it might prevent the adaptation of the infant to postnatal circumstances. Viewed from the standpoint of infant care, anesthetics at delivery should be given to the mother only when the benefit obtained by their use outweighs any possible disadvantages.

Anesthesia, Epidural↗
PubMed1985

[A case of surgical correction of the inferior vena cava obstruction with Budd-Chiari syndrome].

A 37-year-old man is presented with Budd-Chiari syndrome associated with a membranous obstruction of the inferior vena cava. Clinical symptoms were ascites, leg edema and dilatation of the superficial abdominal veins. Aggressive surgery was carried out for this case. Midsternal incision and right subcostal oblique incision were made, and hepatic segment of the inferior vena cava was reconstructed using pericardial patch after endovenectomy and partial cardiopulmonary bypass was used without temporary interruption of liver circulation. Blood flow from the right hepatic vein was restored. Postoperative course was not eventful and this patient remains free of any evidence of ascites and liver dysfunction after operation. This procedure may be useful particularly for protecting the liver function which is damaged by hemostasis.

Adult↗
PubMed1985

[A study of allopurinol in the prevention of recurrent calcium oxalate stones].

We studied the effect of allopurinol on the prevention of stone recurrence in 134 patients with recurrent, idiopathic calcium nephrolithiasis. They consisted of 113 male patients and 21 female, between 16 and 72 years with an average age of 42.7. The patients were divided into two groups according to the type of stone occurrence; those with multiple stones without previous stone episodes (multiple stone group), and the those with recurrent stones (stone episode group). Twenty three patients belonged to the multiple stone group and 111 patients belonged to the stone episode group. The stones in 19 of the 23 patients in the multiple stone group remained stable throughout the study, while stones in 4 grew. Fifty-nine of the 111 patients in the stone episode group were free from recurrence, but the others showed recurrence. Statistical analyses was done on the stone episode group. The stone recurrence rate of all of the 111 cases showed significant decrease during prophylactic treatment with allopurinol (p less than 0.01), although the observation period before treatment was 73.0 +/- 65.8 months and that during and after treatment was 28.2 +/- 12.1 months. During the two years before and after prophylaxis 79 patients also showed a significantly decreased recurrence rate. Moreover, regarding 37 cases without any stones at the start of treatment, stone recurrence rate decreased significantly after the administration of allopurinol. Throughout this study, we used a new method for evaluating reasonable stone recurrence. It did not calculate the number of stones recurred, but the stone-forming circumstance in each kidney.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1984

T cell growth factors from adult T cell leukemia virus-transformed cell lines.

Some characteristics of T cell growth factors derived from adult T cell leukemia virus (ATLV)-transformed cell lines, MT 1 and MT 2 were analyzed. MT 1 cells release significant interleukin 2 (IL 2) activity into the culture medium, which showed the same elution pattern of gel filtration and isoelectric focusing of IL 2 from lectin-stimulated normal human lymphocytes. This activity was also detected in the cell extract of MT 1. In contrast, MT 2 cell line did not produce IL 2 activity, but non-IL 2 type growth factor was observed. The significance of these factors from MT cell lines is discussed from the viewpoint of 'autokine' in ATLV-transformed cells.

Adult↗
PubMed1984

Serum pancreatic secretory trypsin inhibitor in pancreatic disease.

The clinical usefulness of serum pancreatic secretory trypsin inhibitor (PSTI) in pancreatic diseases was evaluated. The mean serum PSTI level of 41 healthy normal persons was 9.4 ng/ml (ranging from 5.2 to 16.7 ng/ml). Serum PSTI levels were abnormally raised in all patients with acute pancreatitis ranging from 35.0 to 4500 ng/ml, but were almost within normal range in patients with chronic pancreatitis, pancreatic cyst, acute abdominal emergencies such as perforated ulcer and intestinal obstruction, and macroamylasemia. There was no correlation between serum PSTI levels and total or pancreatic-type isoamylase activity. Patients with acute pancreatitis in whom the elevation of serum PSTI was transient and occurred after that of serum amylase activity had relatively mild symptoms and recovered along with normalization of serum PSTI levels. On the other hand, patients whose serum PSTI values became increased coincidentally with serum amylase activity and remained elevated, had severe clinical symptoms and unfavorable clinical outcome. Of 2 patients who underwent partial pancreatectomy, the serum PSTI level increased markedly in one who developed postoperative pancreatitis but not in the other without pancreatitis. In contrast to patients with acute pancreatitis, the serum response to the secretin stimulation in patients with chronic pancreatitis, was only small and transient, reaching the maximum at 10 min after administration of secretin. These results suggest that measurement of serum PSTI concentration may be useful in the diagnosis of acute pancreatitis and that the degree of rise and the duration of the elevated levels of serum PSTI are closely related to the severity of acute pancreatitis.

Acute Disease↗
PubMed1984

Functional expression of the genes of Escherichia coli in gram-positive Corynebacterium glutamicum.

Hybrid plasmids were constructed by combining in vitro the Escherichia coli plasmid pGA22, which carries the genes determining resistance to kanamycin, tetracycline, chloramphenicol and ampicillin, with the cryptic plasmids, pCG1 and pCG2, of Corynebacterium glutamicum. The hybrid plasmids were introduced into C. glutamicum and E. coli and replicated in both hosts. They expressed all the E. coli resistance phenotypes except ampicillin resistance in C. glutamicum. The levels of antibiotic inactivating enzymes encoded on these plasmids were about four to ten times lower in C. glutamicum than in E. coli. Despite the lack of expression of ampicillin resistance, beta-lactamase activity was detected in C. glutamicum carrying hybrid plasmids.

Corynebacterium↗
PubMed1984

The role of the spleen in tumor bearing host: I. Characterization of spleen cells in tumor-bearing mice.

Morphologic changes of the spleen and dynamic changes of biologic activity of spleen cells from C3H/HeJ mice bearing methylcholanthrene induced fibrosarcoma (MCA-F) were investigated in different stages of tumor growth, using local adoptive transfer assay (LATA). The spleen size, weight and the number of spleen cells increased with the tumor growth. In early and late stages of tumor growth, tumor-bearing mice possessed non-specific tumor-enhancing cells which were radioresistant (700 rads), phagocytic and adherent, suggesting that they were macrophages. On the other hand, in middle stages of tumorgenesis, tumor-bearing mice possessed specific cytotoxic cells which were radiosensitive (700 rads) and anti-Thy 1.2 serum positive, suggesting that they were T-cells. Thus, the appearance of tumor-enhancing cells was earlier than cytotoxic cells in MCA-F bearing host, and the balance of tumor-enhancing and cytotoxic cells may influence the tumor outgrowth in different stages of tumorgenesis. The spleen serves as a reservoir of factors which either abrogate cell mediated resistance or stimulate neoplastic growth, or as the source of cytotoxic cells, at certain times of tumor burden.

Animals↗
PubMed1984

The role of the spleen in tumor bearing host: II. The influence of splenectomy in mice.

The effect of splenectomy on neoplastic outgrowth was examined prior to and after implantation of methylcholanthrene-induced C3H/He murine tumors. Splenectomy performed 12 days before tumor inoculation did not affect the tumor outgrowth, however, both splenectomy and sham operation performed shortly before tumor inoculation resulted in significant tumor facilitation compared with the non-operated group, suggesting that this accelerated tumor was not related to the presence or absence of splenic tissue, but rather to systemically-induced immunosuppression. While splenectomy performed 6, 9, 12 days after tumor inoculation did not alter the tumor growth, splenectomy performed early (3 days) or late stage (20 days) after tumor cell challenge revealed a retarded neoplastic outgrowth, compared with the sham operated group. These results suggest that splenectomy in very early and late stages of tumor-bearing host may be effective for tumor treatment.

Animals↗
PubMed1984

The study of differentiative potential of the lactating mouse mammary gland in organ culture.

The organ culture of the mammary gland of lactating mice was used to examine the response of the differentiated gland to lactogenic stimuli, insulin, cortisol, and prolactin. Time course studies showed that casein synthesis in cultured tissue decreased rapidly during the first 2 d despite the presence of the three hormones, but on the 3rd d tissue cultured with either insulin and prolactin or all three hormones regained the ability to synthesize milk proteins, casein, and alpha-lactalbumin: a greater increase occurred in the three hormone system. The delayed addition of prolactin on Day 2 to the culture system containing insulin and cortisol also stimulated casein synthesis. The addition of cytarabine, which inhibited insulin-dependent cell proliferation in cultured explants, did not block the rebound of milk protein synthesis. These results indicate that in the presence of insulin, cortisol, and prolactin mammary epithelial cells in culture first lose and then regain the ability of synthesizing milk protein without requiring the formation of new daughter cells.

Animals↗
PubMed1984

Amylase inhibitor from wheat: its action and clinical application.

The electrophoretic and column chromatographic characteristics of an amylase inhibitor of wheat origin were investigated. Further, the clinical usefulness of this inhibitor for determining the ratio of pancreatic to salivary isoamylase activity in serum was evaluated. Amylase inhibitor inhibits the action of salivary alpha-amylase by making an amylase-inhibitor complex, which is easily separated into its individual component during electrophoresis with full recovery of amylase activity. Using the specific inhibitory effect of this inhibitor on salivary alpha-amylase activity, the ratio of pancreatic to salivary isoamylase activity (P/S) in serum was determined. There was a good correlation in P/S ratio in serum between the results obtained with the inhibitor method and those with electrophoretic method. The P/S ratio in sera from patients with acute pancreatitis was over 8.0, whereas that in sera from patients with salivary-type hyperamylasemia such as mumps, pulmonary diseases and following surgery was less than 0.1. However, hyperamylasemia due to macroamylase or renal failure could not be identified by the inhibitor method.

Amylases↗