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Biomedical subjects

J Liniecki

Publications and source records attributed to J Liniecki.

At least 37 records · Page 2Linked to original sources
PubMed1983

Uptake of labelled tallysomycin by solid Ehrlich ascites tumors in mice.

Tumor and normal tissue uptake of 51Cr- or 57Co-labelled bleomycin (BLEO) and tallysomycin (TLM) was compared in female solid Ehrlich ascites tumor mice of Swiss strain. The complexes were administered intraperitoneally: 30-50 micrograms of each complex with an activity of 40-120 microCi. Activity distribution factors (ADF) and tumor/non-tumor ratios for blood, bone, skeletal muscles, kidneys and liver were determined. The ratios were generally higher for complexes labelled with 57Co than for the 51Cr-labelled ones; bleomycin appears equivalent or superior to tallysomycin.

Animals↗
PubMed1983

51Cr-bleomycin in the diagnosis of ocular melanoma.

51Cr-bleomycin was administered to 18 patients suspected of having an ocular melanoma with varying degree of development. The diagnosis was verified prior to surgical removal of the eye-ball by fluorescent angiography and computerized axial tomography. In operated patients histological diagnosis was also available. Scintigraphy after 51Cr-bleomycin administration appeared to be an effective diagnostic measure: sensitivity and specificity reached 90 and 87%, respectively. It is concluded that the method is useful in the preoperative diagnosis of ocular melanoma.

Adult↗
PubMed1983

Comparative evaluation of renoscintigraphic properties and plasma clearance of 99MTc-DADS (99mTc-N,N'-bis/mercaptoacetamido ethylenediamine), 99mTc-DTPA and 131I-o-hippuran.

Plasma clearance of 99mTc-N,N'-bis (1,2-mercaptoacetamido) ethylenediamine (DADS), 99mTc-DTPA and 131I-o-hippuran (OIH) was determined in rabbits from blood-concentration decay curves after single i.v. injection of the compounds. Dynamic scintigraphy was performed using the same three compounds, and "activity" curves were compared as observed over kidney ROIs. Both clearance values and renoscintigraphic curves were similar for 99mTc-DADS and 99mTc-DTPA but evidently different from those of OIH. Biliary excretion of 99mTc-DADS was also observed. It appears that, in contrast to other authors, 99mTc-DADS cannot serve as a substitute for 131I-o-hippuran.

Animals↗
PubMed1983

Plasma clearance of 99mTc-N/2,4-dimethyl-acetanilido/iminodiacetate complex as a measure of parenchymal liver damage.

Fifty-two patients were studied with various diseases affecting liver parenchyma. Any disorders of bile transport were excluded on the basis of dynamic liver scintigraphy using intravenously injected N/2,4-dimethyl acetanilido/iminodiacetate 99mTc complex (HEPIDA). The activity concentration of 99mTc-HEPIDA in plasma was measured from 5 through 60 min post injection. Clearance of the substance (ClB) was calculated from blood plasma disappearance curves and compared with results of 13 laboratory tests used conventionally for assessment of damage of the liver and its functional capacity; age and body weight was also included in the analysis. Statistical relations were studied using linear regression analysis of two variables, multiple regression analysis as well as multidimensional analysis of variance. It was demonstrated that 99mTc-HEPIDA clearance is a simple, accurate and repeatable measure of liver parenchyma damage. In males, values of ClB above 245 ml. min-1/1.73 m2 exclude hepatic damage with high probability; values below 195 ml.min-1/1.73 m2 indicate evident impairment of liver parenchyma function.

Adolescent↗
PubMed1982

51Cr-bleomycin, a new oncophilic radiopharmaceutical. I. Activity concentrations in transplantable tumours and organs-tissues of mice.

A method was developed for labeling bleomycin with 51Cr. The complex was administered to mice (Swiss and C57-B1/6) bearing 5 transplantable tumours: Ehrlich ascites tumour, NK/Ly lymphoma, Lewis lung carcinoma, melanoma B-16, and Sarcoma 180. Activity concentration in neoplasms, blood and numerous organs was determined 12, 24 and 48 hrs after injection. An identical procedure was applied using 58Co-bleomycin as a reference oncophilic substance. Tumour/non-tumor ratios exceeding substantially unity were found for blood, muscle and bone indicating preferential accumulation of both 58Co and 51Cr in all the neoplasms tested. The ratios were lower (by a factor 2-3) for 51Cr than for 58Co; however, it is postulated that the gamma-quantum energy of 51Cr which is higher than that of the commonly used 57Co, should offset to some degree this difference when scintigraphic tumour detection in a patient is to be attempted. In conclusion, clinical trials with 51Cr-bleomycin, which is cheaper than its 57Co-counterpart, appear warranted.

Animals↗
PubMed1982

51Cr-bleomycin, a new oncophilic radiopharmaceutical. II. Scintigraphic diagnosis of malignant neoplasms.

51Cr-bleomycin was used for the scintigraphic detection of tumours and the assessment of the spread of the disease in 20 patients with various malignancies: 7 with Hodgkin's lymphoma, 5 with other malignant lymphomas, 4 cases of cervix carcinoma and 4 other tumours. The scintigraphy was performed using a Toshiba GC 401 gamma camera coupled to an MDSI computer Trinary. Active foci were scored using a semiquantitative scale of 0 to 5. Results of these studies were compared with those of tests similarly carried out with 57Co-bleomycin (in 9 of the cases) and 67Ga-citrate (11 cases); they demonstrated that the properties of 51Cr-bleomycin for scintigraphic detection of neoplastic foci are similar to those of 57Co-bleomycin.

Bleomycin↗
PubMed1981

Direct assessment of effective renal plasma flow from renoscintigraphy with a gamma camera and an on-line computer.

A concept of a kidney uptake coefficient (UC) of 131I-o-hippurate was developed by analogy from the corresponding kidney clearance of blood plasma in the early period after injection of the hippurate. The UC for each kidney was defined as the count-rate over its ROI at a time shorter than the peak in the renoscintigraphic curve divided by the integral of the count-rate curve over the "blood"-ROI. A procedure for normalization of both curves against each other was also developed. The total kidney clearance of the hippurate was determined from the function of plasma activity concentration vs. time after a single injection; the determinations were made at 5, 10, 15, 20, 30, 45, 60, 75 and 90 min after intravenous administration of 131I-o-hippurate and the best-fit curve was obtained by means of the least-square method. When the UC was related to the absolute value of the clearance a positive linear correlation was found (r = 0.922, p greater than 0.99). Using this regression equation the clearance could be estimated in reverse from the uptake coefficient calculated solely on the basis of the renoscintigraphic curves without blood sampling. The errors of the estimate are compatible with the requirement of a fast appraisal of renal function for purpose of clinical diagnosis.

Computers↗
PubMed1980

The yield of radiation-induced chromosomal aberrations in lymphocytes as related to the time of arrival at first post-stimulation mitosis.

Blood from 3 donors of each species, man, rabbit and pig, were irradiated with a dose of 2.5 Gy 60Co gamma-rays. Micro-cultures of lymphocytes, established in presence of BrdUrd, were harvested at 6 different times after stimulation by PHA. The preparations containing metaphase figures were stained according to Perry and Wolff to permit differentiation of the cells in first and later mitoses. In all individuals and species studied there was a highly significant negative correlation between dicentric yield and time from stimulation to harvest. The decline of the yield with time of harvest varied in 3 species between 1.0 and 3.6% per hour. Implications for biological dosimetry are discussed.

Adult↗
PubMed1979

A method for subtraction of the extrarenal "background" in dynamic 131I-hippurate renoscintigraphy.

Using a Toshiba GC-401 gamma camera with MDS computer Trinary a new method was developed for subtracting the extrarenal (extracanalicular) "background" from the count rate recorded over the kidneys after intravenous administration of 131I-hippurate. Mean subtraction factors of the "blood" activity curve were calculated from a study of 27 patients who were given 51Cr-HSA for purposes of conventional renography with "background" subtraction. The values of the mean subtraction factors FR,L for the right and left kidney, by which a blood count rate should be multiplied amounted to 0.86 +/- 0.12 and 0.79 +/- 0.13, respectively. A comparison of the coefficients of variation of the pure renal signal when mean vs. individually determined subtraction factors were used, and the verification of the method in unilaterally nephrectomized patients have demonstrated that determination of the factors, FR,L, for each patient individually is not required and sufficient precision can be obtained by using the method and factors reported in this study.

Chromium Radioisotopes↗
PubMed1977

Gamma-radiation-induced chromosomal aberrations in human lymphocytes: dose-rate effects in stimulated and non-stimulated cells.

Stimulated and non-stimulated human peripheral blood lymphocytes were irradiated acutely and chronically, over 24 h. Dose-effect relationships for dicentric chromosomes were established and various models were fitted to the data. At prolonged irradiations the yield decreased in basic agreement with the linear-quadratic model of abberration induction. Dose-protraction experiments of PHA+ and PHA- lymphocytes, irradiated under various conditions of oxygenation and suspension (culture medium, whole blood) showed that the rejoining time increased from about 3 h in non-stimulated cells to about 10 h after PHA stimulation, and that this retarded rejoining was most likely due to blastic transformation itself and not to other conditions of irradiation.

Adult↗
PubMed1975

The yield of chromosomal aberrations in rabbit lymphocytes after irradiation in vitro and in vivo.

The culture time of rabbit lymphocytes (41-42h) that provides cells in their first post-stimulation mitosis, was estimated on the basis of the mitotic index, dicentric yield and presence of the cells with these aberrations unaccompanied by acentric fragments, studied as a function of culture duration. The cells obtained in metaphase from cultures terminated at this time displayed no donor-to-donor variation where induction of dicentrics by x-rays was concerned. Rabbit venous blood was irradiated in vitro with a range of X-and gamma-ray doses, and dose-effect curves were obtained by regression analysis. Sixteen rabbits were irradiated in vivo (uniform whole-body irradiation), and blood was sampled 10 min, 6, 24, and 48 h after exposure. The frequency of dicentrics in the lymphocytes cultured did not change significantly over the first 24 h after irradiation. Dose-effect relationships in vivo fell within one standard error confidence limits of the respective curves in vitro. The authors conclude that the latter may be used for estimation of dose in vivo under conditions of homogeneous whole-body irradiation.

Animals↗