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  • 1.
    Johansson, Kjell
    Department of Zoology, University of Lund .
    Identification of different types of serotonin-like immunoreactive olfactory interneurons in four infraorders of decapod crustaceans1991In: Cell and Tissue Research, ISSN 0302-766X, E-ISSN 1432-0878, Vol. 264, no 2, p. 357-362Article in journal (Refereed)
    Abstract [en]

    An antiserum raised against serotonin (5HT) was applied to the brains of representatives of four different infraorders of decapod crustaceans, and revealed two morphological classes of olfactory interneurons. They were classified by the position and size of their cell bodies, and their connection pattern. One class consisted of giant olfactory interneurons and the other of globuli cells. They were regarded as input and intrinsic interneurons, respectively, because of their morphology. The two classes displayed a similar pattern in two of the infraorders, whereas only one class appeared in the other two infraorders. 

  • 2. Ohlsson, LG
    et al.
    Johansson, Kjell
    Department of Zoology, University of Lund.
    Nässel, D
    Postembryonic development of Arg-Phe-amide-like and cholecystokinin-like immunoreactive neurons in the blowfly optic lobe1989In: Cell and Tissue Research, ISSN 0302-766X, E-ISSN 1432-0878, Vol. 256, p. 199-211Article in journal (Refereed)
    Abstract [en]

    The adult optic lobes of the blowfly Calliphoraerythrocephala were found to be innervated by more than2000 neurons immunoreactive to antisera raised against theneuropeptides FMRFamide, its fragment RFamide, andgastrin/cholecystokinin (CCK). All of the CCK-like immunoreactive(CCK-IR) neurons also reacted with antisera toRFamide, FMRFamide and pancreatic polypeptide. A fewRFamide/FMRFamide-like immunoreactive (RF-IR) neuronsdid not react with CCK antisera; they reacted insteadwith antisera to Leu-enkephalin and Met-enkephalin-Arg 6-Phe 7. The RF-IR neurons are, thus, heterogeneous withrespect to their contents of immunoreactive peptides. Twoof the RF-IR neuron types innervating the adult optic lobescould be traced in their entirety only after following theirpostembryonic development, because of the complexity ofthe trajectories of the immunoreactive neuronal process inthe adult insect. The majority of the cell bodies of the RFIRand CCK-IR neurons lie within the optic lobes andare derived from imaginal neuroblasts of the inner and outeroptic anlagen. Six of the peptidergic neurons are, however,metamorphosing larval neurons with their cell bodiesin the central part of the protocerebrum. The full extentof immunoreactivitiy is not attained in some of the neuronsuntil the late pupal or early adult stage. The larval opticcenter was also found to be innervated by neurons immunoreactivewith both RFamide and CCK antisera. The cellbodies of these RF-IR/CCK-IR neurons are located nearthe developing lamina (one on each side). In the 24 h pupa,the cell bodies of these neurons are still immunoreactive,but thereafter they cannot be immunolabeled apparentlydue to cell death or a change in transmitter phenotype. 

  • 3.
    Tågerud, Sven
    et al.
    UNIV LUND, DEPT PHARMACOL, S-22362 LUND, SWEDEN .
    Libelius, Rolf
    Lysosomes in skeletal muscle following denervation. Time course of horseradish peroxidase uptake and increase of lysosomal enzymes1984In: Cell and Tissue Research, ISSN 0302-766X, E-ISSN 1432-0878, Vol. 236, no 1, p. 73-79Article in journal (Refereed)
    Abstract [en]

    The in-vivo uptake of exogenously applied horseradishperoxidase and the activities of the lysosomal enzymesacid phosphatase and cathepsin D were studied histochemicallyand/or biochemically in innervated and2-14 day-denervated tibialis anterior muscles of the mouse.The biochemically determined uptake of horseradish peroxidaseshowed a large increase already 4 days after denervation.The activities of the lysosomal enzymes increased ina more gradual fashion, and only cathepsin D showed anincrease in activity when expressed as total activity per muscle.Histochemically horseradish peroxidase was found tobe localized in muscle fibres in characteristic spindle-shapedsegments after denervation. The main increase in thenumber of such segments per transverse section of the muscleoccurred between 3 and 6 days after denervation. Inserial sections these segments frequently showed positivestaining also for acid phosphatase.It is concluded that exogenously applied horseradishperoxidase is taken up into the lysosomal system, whichafter denervation becomes organized into characteristicspindle-shaped segments in the muscle fibres. The endocyticactivity of muscle fibres increases early after denervation.This is followed by a more gradual increase in activity oflysosomal enzymes and finally by an organization of thelysosomal system into characteristic spindle-shaped segments.The results are compatible with the working hypothesisthat increased endocytosis may initiate lysosomal activationin denervated skeletal muscle. 

  • 4.
    Tågerud, Sven
    et al.
    Department of Pharmacology, University of Lund.
    Libelius, Rolf
    Shainberg, A
    High endocytotic and lysosomal activities in segments of rat myotubes differentiated in vitro1990In: Cell and Tissue Research, ISSN 0302-766X, E-ISSN 1432-0878, Vol. 259, p. 225-232Article in journal (Refereed)
    Abstract [en]

    Endocytosis and the lysosome system have beenstudied in rat myotubes differentiated in vitro. Horseradishperoxidase was used as marker for endocytosis and wasfound to accumulate unevenly in the myotubes. Small segmentsof myotubes display very high endocytotic activity.Similar segments contained numerous lysosomes, as seenby the accumulation of neutral red or histochemical stainingfor acid phosphatase. The segments also contained accumulationsof acetylcholine receptors as determined by bindingof tetramethyl rhodamine-labelled c~-bungarotoxin. Unstainedsegments in living cultures could be recognized byphase-contrast microscopy since they often appeared somewhatdilated and were not as well spread on the culturesurface as the main parts of the myotubes. Ultrastructurally,the segments contained an intensely proliferating tubularsystem in communication with the extracellular space,which therefore probably represents the developing transversetubular system. The segments also contained endocytosedmarker within large phagosomes. Contractile filamentsoccurred in the segments but were frequently lesswell-organized than in other parts of the myotubes. Thedescribed characteristics of the segments in rat myotubesdifferentiated in vitro bear resemblance to some of the characteristicsof the denervated endplate region of adult muscle. 

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