The effects of cytotropic compounds on the resialylation of human asialotransferrin type 3 in the rat

Effects of chloroquine, colchicine, leupeptin, taxol and vinblastine on the resialylation and degradation of human [125I]asialotransferrin type 3 were studied in rats. An improved experimental technique was applied that permitted the quantification of resialylated ligand produced by individual animals over 3 h by using deconvolution. All three microtubule inhibitors increased the proportion of the dose undergoing resialylation by 35-39%. In addition, colchicine, and, especially, vinblastine enhanced the overall recovery of the dose as protein-bound 125I. The dose recovery was also augmented by leupeptin without any concomitant change in resialylation. Chloroquine suppressed resialylation and this effect could only be partially lifted by the administration of colchicine. The blood of colchicine-treated rats possessed no resialylating activity toward the ligand even when supplemented with additional alkaloid in vitro. The observations support the view that the respective fractions of the ligand destined for resialylation and degradation can, to a certain extent, be varied independently of each other. The effects of short-term starvation (20 h) and refeeding (4 h) on these processes are also presented.     

Locus determining the human sperm-specific lactate dehydrogenase,LDHC, is syntenic with LDHC

From the data presented in this report, the human LDHC gene locus is assigned to chromosome 11. Three genes determine lactate dehydrogenase (LDH) in man. LDHA and LDHB are expressed in most somatic tissues, while expression of LDHC is confined to the germinal epithelium of the testes. A human LDHC cDNA clone was used as a probe to analyze genomic DNA from rodent/human somatic cell hybrids. The pattern of bands with LDHC hybridization is easily distinguished from the pattern detected by LDHA hybridization, and the LDHC probe is specific for testis mRNA. The structural gene LDHA has been previously assigned to human chromosome 11, while LDHB maps to chromosome 12. Studies of pigeon LDH have shown tight linkage between LDHB and LDHC leading to the expectation that these genes would be syntenic in man. However, the data presented in this paper show conclusively that LDHC is syntenic with LDHA on human chromosome 11. The terminology for LDH genes LDHA, LDHB, and LDHC is equivalent to Ldhl, Ldh2, and Ldh3, respectively.     

Requirement of cell nucleus for Sindbis virus replication in cultured Aedes albopictus cells.

The ability of Sindbis virus to grow in enucleated BHK-21 (vertebrate) and Aedes albopictus (invertebrate) cells was tested to determine the dependence of this virus upon nuclear function in these two phylogenetically unrelated hosts. Although both cell types could be demonstrated to produce viable cytoplasts (enucleated cells) which produced virus-specific antigen subsequent to infection. BHK cytoplasts produced a significant number of progeny virions, whereas mosquito cytoplasts did not. The production of vesicular stomatitis virus in mosquito cells was not significantly reduced by enucleation. That such a host function was not essential for vesicular stomatitis virus growth in insect cells is supported by the observation that the production of this virus by mosquito cells is not actinomycin D sensitive. This result agrees with a previously published report in which it was shown that Sindbis virus maturation in invertebrate cells is inhibited by actinomycin D, indicating a possible requirement for host cell nuclear function (Scheefers-Borchel et al., Virology, 110:292-301, 1981).     

Brain acyl-coenzyme A hydrolase: distribution, purification and properties

Rat brain acyl-CoA hydrolase enzymes which hydrolyse C₂, C₄, C₈ and C₁₆ derivatives were localized primarily in the soluble, 144,000 g, supernatant fluid. With octanoyl-CoA as substrate, long-chain acyl-CoA hydrolase activity was greater in the pons, medulla and midbrain than in the cerebral cortex and caudate nucleus. The long-chain acyl-CoA hydrolase enzyme was purified from bovine brain stems to a specific activity of 4-61 n mol of palmitoyl-CoA hydrolysed per min per mg protein. The K_m values for palmitoyl-CoA and octanoyl-CoA were 5 μm and 14 μ/m , respectively. Activity of the enzyme was inhibited by bovine serum albumin and ρ-chloromercuribenzoate. The partially purified enzyme protein was found to have approximately eight titratable sulphydryl residues per 10⁵ g of protein. Studies of the molecular weight of the enzyme indicated the presence of associated and dissociated forms with molecular weights of approximately 96,000 and 46,000 respectively.     

Die Mauser der Schopfkuckucke(Clamator)

Zusammenfassung Alle Arten der GattungClamator erneuern die 6 äußeren Handschwingen in der Reihenfolge 6 — 9 — Pause — 7 — 10 — Pause — 8 — 5 (oder 5 — 8). Die 10 oder 11 Armschwingen werden regellos transilient gemausert. Für den Wechsel der 5 Steuerfedern gilt nur die Regel, daß eine der drei langen Federn S 1, S 2 und S 3 an beiden Schwanzhälften so lange stehen bleibt, bis mindestens eine der übrigen ausgewachsen ist. Infolge dieser Regelung hatClamator während der Vollmauser ständig einen langen Schwanz.Alle Flugfedern und die Körperfedern werden bei den Adulten im gleichen Zeitraum erneuert. BeiClamator glandarius läßt sich die Dauer der Vollmauser auf etwa 100 Tage schätzen.Die Jungen beginnen alle Federn zu erneuern, bevor sie 6 Monate alt sind. Nach dem Ende der Jugendmauser tritt die Geschlechtsreife ein.DieClamator- Sequenz der 6 äußeren Handschwingen unterscheidet sich fundamental von derCuculus-Sequenz, die von allen übrigen, geregelt mausernden Schmarotzerkuckucken der Alten Welt (Cuculinae) mehr oder weniger streng befolgt wird. Beide Sequenzen sind offenbar unmittelbar aus der ungeregelt transilienten Mauserweise der nicht-parasitischen und einiger parasitischer Kuckucke (z. B.Caliecbtbrus) hervorgegangen.

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Summary In all species of the cuculine genusClamator, the 6 outer primaries are moulted in the sequence 6–9 — pause — 7–10 — pause — 8–5 (or 5–8). The secondaries, 10 or 11 in number, are replaced in an irregular transilient way. There is only one rule governing the moult of the rectrices. One of the prolonged ones (S 1, S 2, and S 3) on each side is retained until at least one of the others has been renewed to its full length. In this way,Clamator retains a long tail all through the period of complete moult.All flight-feathers and the body plumage are replaced in the adults in the same span of time. The complete moult may last about 100 days inClamator glandarius. The young birds begin to moult all juvenal feathers before being about 6 months old. After this moult they are sexually mature.TheClamator sequence of the 6 outer primaries differs fundamentally from theCuculus sequence. The latter is followed (more or less strictly) by all other parasitic cuckoos of the Old World which have developed a regulation of the primary moult. Both sequences sprung obviously from the irregularly transilient mode which is to be found in all non-parasitic and a few parasitic genera of Cuckoos. This confirms the isolated position ofClamator.

     

IDIOPATHIC PULMONARY HEMOSIDEROSIS

Idiopathic pulmonary hemosiderosis is a rare condition manifested by recurrent pulmonary hemorrhage of unknown cause, diffuse radiologic abnormalities, cough, hemoptysis and moderate to severe hypochromic anemia. Diagnosis can be confirmed by iron stains of the sputum or lung aspiration or by biopsy. Prolonged spontaneous remission may occur without the use of corticosteroid therapy. Studies here reported indicated that the anemia is hypochromic and microcytic anemia of blood loss and iron deficiency, in spite of the presence of large amounts of iron in the pulmonary tissue. Correction of the anemia by intensive iron therapy and transfusion is considered an important part of therapy.     

Fatty acid uptake and catecholamine-stimulated phospholipid metabolism in immortalized airway epithelial cells established from primary cultures

The incorporation of [14C]oleic and [14C]linoleic acid into phospholipids and neutral lipids was compared in two recently immortalized airway epithelial cell lines. In addition, the effects of adrenergic stimulation on phospholipid turnover was examined. Both cell lines readily incorporated the fatty acids into all phospholipid and neutral lipid fractions. Isoproterenol (1 microM) induced Ca2+ transients in both cell lines, indicating a functional beta-adrenergic response. Epinephrine (10 microM; 15 min) stimulation of cells prelabeled with [14C]linoleic acid increased the percentage of label in phosphatidylcholine in one cell line. Lipid metabolism can now be extensively studied in human airway epithelia.     

Spontanvegetation Nordgriechischer Bergdörfer

The synanthropic vegetation in seven villages of Northern Greece (N Pindhos and Olympus massif)—situated either in theQuercion confertae or in theFagetalia zone—is analyzed on the basis of about 100 phytosociological relevés. The most important vascular plant species of ruderal sites have also been mapped floristically. Nineteen plant communities are discernible, some of which are mentioned for the first time here. Nevertheless, the author refrains from hastily describing new associations, unless a more detailed phytosociological data basis on ruderal vegetation in the Southern Balkans is available. A table refers to differences and similarities between the recognized plant communities in Greek villages and those which correspond to them in Central Europe. Non-industrial methods of agriculture and animal husbandry are among the most important conditions for the remarkable rich vegetation in Greek mountain villages.