Testing genotoxicity and cytotoxicity strategies for the evaluation of commercial radiosterilized fetal calf sera.

Effects of 18 commercial lots of fetal calf serum (FCS) after gamma-irradiation and their non-irradiated counterparts were comparatively analyzed on CHO-K1 and MDBK MDL1 cells for genotoxicity [sister chromatid exchange (SCE), micronuclei (MNi), and single cell gel electrophoresis (SCGE)], cytotoxicity [cell-cycle progression (CCP), proliferative replication index (PRI), mitotic index (MI), growth promotion (GP), and plating efficiency (PE)], and microbiological properties (mycoplasma and bovine viral diarrhea virus contamination). SCE and SCGE were the most informative end-points for genotoxicity since significant differences were found in 44.4% (P<0.05-0.001, Student's t-test) and 61.1% (P<0.05-0.001, chi(2) test) samples, respectively. MI was the cytotoxicity assay revealing the greatest variation, showing differences in 66.7% (P<0.05-0.001, chi(2) test) samples. Thus, these three end-points for screening bioproducts such as FCS were found most suitable for detecting potential geno-cytotoxicants in biological samples; their simultaneous use could be strongly recommended.

Determinaciòn de TSH para el diagnòstico precoz de hipotiroidismo neonatal: estudios previos a la implementaciòn de un programa de Tsh / Annual reports 1993 / Determination of TSH for early diagnosis of neonatal hipothyroidism: neonatal preliminary studies for the implementation of a neonatal Tsh program

En este trabajo estandarizò la toma de muestra en sangre de cordòn de recièn nacidos por goteo en papel de filtro y se adecuo la tècnica de dosaje de TSH neonatal por el mètodo IRMA, en base a la producciòn local de estandaresw y trazadores, complementados con reactivos NETRIA. Se analizaron 2500 muestras del Centro de Salud N§ 5 y de la Maternidad del Hospital de Clìnicas. El rango de TSH neonatal (Confianza del 95 por ciento), es de 13.6 +/-15.7 microUI/ml, siendo el punto de corte de 30 microUI/ml