The cDNA of mouse skeletal muscle transcribe for both isoforms 1 and 2 of acetylcholine receptor alpha subunit

The mRNA isolated from mouse ocular and limb muscle and human rabdomyosarcoma cell line TE671 was subjected to reverse transcriptase polymerase chain reaction (RT-PCR) using a specific primer pair for the extracellular domain of AChR-alpha subunit that transcribes both for P3A- (isoform 1) and P3A+ (isoform 2). The cDNA synthesized from mRNA by reverse transcription, transcribed both isoforms 1 and 2 from mRNA of mouse limb and ocular muscle and human rabdomyosarcoma cell line TE671 as evidenced by agarose gel electrophoresis of polymerase chain reaction products.

In vitro interferon and virus production at in vivo physiologic oxygen tensions

Rhabdomyosarcoma (TE) and cervical carcinoma (MS) cells 24 h previously brought from medium with a PO2 of 18 kilo Pascal (kPa) (ambient air) to PO2 of 6 or 3 Kpa (in vivo physiologic values) were infected with Sendai virus, and the interferon (IFN) and virus production was followed in the ensuing 24 h period. With TE cells the IFN production decreased when moving from 18 to 6 Kpa and ceased completely at 3 Kpa, while the virus production responded inversely. MS cells produced most IFN at the lowest oxygen tension, and virus production was only moderately affected. Growth for three months at the three different oxygen tensions prior to infection reduced the difference in IFN production at the different oxygen tensions. On the same target cells different human virus responded in different ways to the tested oxygen tensions. It is concluded that mimicking the in vivo situations might require primary cultures of virus and cells to be started and passaged at in vivo physiological oxygen tensions.

An improved Hedley method for preparation of paraffin-embedded tissues for flow cytometric analysis of ploidy and S-phase

A modification of the Hedley-method for flow cytometric DNA analysis of paraffin-embedded tissues is presented. Dewaxed and dehydrated tissue from paraffin blocks was incubated with subtilisin Carlsberg (pronase, Sigma protease XXIV) and then stained directly without washing and centrifugation. The loss of material was minimized, which was advantageous, for example, for the analysis of core-biopsies, and all measured samples showed extremely low frequencies of clumped cell nuclei. This made is easier to detect polyploid nuclei and even rare nuclei of high ploidy could be identified. S-phase analyses were more precise, since the background originating from clumped debris particles was very low. The improved method was applied to the estimation of frequencies of high-polyploid nuclei found in various diploid, tetraploid, and aneuploid human myosarcomas of the uterus.

Attempts to induce tubular deformations and subsequent mixed tumours from organotypic cultures of mouse renal mesenchyma

With the aim of expanding knowledge on the pathogenesis of nephroblastomata, an embryological organ culture system (Grobstein, 1956) was tested for its applicability to in vitro carcinogenesis experiments by using murine sarcoma virus (MSV-M) and 3-methylcholanthrene (MCA). Treatment of CBA/H-T6 mouse metanephrogenic mesenchyma with MSV-M at the pretubular stage neither disturbed the glomerulogenesis nor induced rapid malignant transformation. Treatment of the same tissues with MCA considerably inhibited the glomerulogenesis but failed to also reduce rapid malignant transformation. However, one MSV-M, one MCA and two untreated cultures showed malignant transformation after prolonged survival in vitro and produced different histological types of tumours upon transplantation into newborn CBA/H-T6 mice.

Primary mixed myosarcoma of the uterine tube: a case report and review of the literature

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