A putative second cell-derived oncogene of the avian leukaemia retrovirus E26

The acute avian leukaemia retroviruses AMV and E26 both induce myeloblastosis in vivo and transform myeloblasts in vitro. Both viruses contain the oncogene v-myb first described for AMV. Unlike AMV, E26 has the additional capacity to induce erythroblastosis in vivo and to transform erythroblasts. Previous analyses indicated that the genome of E26 also contained nucleotide sequences distinct from v-myb and unrelated to viral replicative genes. Using a molecularly cloned E26 provirus, we have now identified a novel nucleotide sequence designated v-ets (for E-twenty-six specific) of approximately 1.5 kilobase pairs (kbp) located next to v-myb. v-ets possesses all the structural characteristics of a putative new oncogene: it has a conserved cellular counterpart c-ets which is transcribed in some normal chicken cells as a major 7.5-kb polyadenylated RNA. Although our results now await elucidation of their biological significance, we propose that v-ets could be a new oncogene accounting for the additional transforming properties of E26, or potentiating the transforming properties of the v-myb oncogene.     

Synthetic peptides related to caerulein1. Note 1

Riassunto Vengono descritte le proprietà di una serie di peptidi sintetici affini alla ceruleina e si discutono brevemente i rapporti fra attività e struttura.

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A. Anastasi, V. Erspamer andR. Endean, Experientia23, 699 (1967).

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This work was in part supported by grants from the Consiglio Nazionale delle Ricerche, Roma.     

Synthetic peptides related to eledoisin. Physalaemin-like peptides

Riassunto Vengono riportate le proprietà di una serie di peptidi sintetici affini per struttura alla fisalemina.     

Differential loss of cellular constituents in cytocentrifuge preparations

Zusammenfassung Eine quantitative mikroskopische Analyse von Zellen, die man bei 1000 U/min zytozentrifugiert hatte, zeigte, dass die Zellen Proteinbestandteile des Zytoplasmas verlieren, während der DNS-Gehalt des Kerns unverändert bleibt. Untersuchungen von 8 verschiedenen Zellarten ergaben, dass die beobachteten Verluste spezifisch von der Zellart abhängen und mit der Struktur der Zellmembran zusammenhängen könnten.

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These studies were supported in part by research grants No. C-6516 from the National Cancer Institute, and No. FR-05526 from the Division of Research Facilities and Resources, National Institutes of Health.     

MethylTrans-monocyclofarnesate from the spongeHalichondria panicea

Riassunto L'estere metilico dell'acidotrans-monociclofarnesico (5) è stato ora isolato dalla spugnaHalichondria panicea. Il suo rinvenimento nello stesso organismo, dal quale erano state isolate precedentemente le paniceine. (1–3), supporta l'ipotesi che la parte sesquiterpenoidica di quest'ultime si origini biogeneticamente da un precursore monociclofarnesilico.