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Biomedical subjects

L Terenius

Publications and source records attributed to L Terenius.

At least 271 records · Page 15Linked to original sources
PubMed1983

Polypeptide YY (PYY) and pancreatic polypeptide (PP) in rectal carcinoids. An immunocytochemical study.

The frequency and distribution of polypeptide YY (PYY) and pancreatic polypeptide (PP) immunoreactive tumour cells of 14 small intestinal and of 27 rectal carcinoids were studied. All small intestinal and 14 rectal tumours were unreactive to both hormones. However, 13 rectal carcinoids contained a variable number of PP-immunoreactive cells. In four of these cases both PYY- and PP-immunoreactive cells were seen. The PP-immunoreactive cells greatly exceeded the number of PYY-immunoreactive cells. Two rectal carcinoids with PYY and PP immunoreactivities, but not the rest of the tumours, reacted also with an antiserum specific to the C-terminus of PP. This indicates that most PP immunoreactive rectal carcinoids lack the C-terminus sequence of the PP molecule.

Carcinoid Tumor↗
PubMed1983

Opioid activity released from cat spinal cord by sciatic nerve stimulation.

Spinal superfusion was performed in anesthetized cats before and during sciatic nerve stimulation. The superfusates were fractionated on Sephadex G-10 columns and thereafter on electrophoresis and HPLC. The endorphin activity was monitored by radioreceptor and radioimmunoassays. In additional experiments, chromatographic fractions were subjected to enzymatic digestion prior to radioimmunoassay. Nerve stimulation caused a release of at least three different endorphins which separated on electrophoresis, one of which comigrated with [Met]enkephalin-Lys6. The identity of this peptide was further supported by HPLC analysis and radioimmunoassay. Furthermore, enzymatic degradation experiments provided evidence for the presence of enkephalin sequences in all three components released by stimulation. There were also increased dynorphin concentrations during stimulation. These findings suggest that at least two different endorphin systems (enkephalin and dynorphin) are functionally present in spinal cord and may be activated by somatic stimulation.

Animals↗
PubMed1983

Fluorescent probes for opioid receptors.

Naloxone, naltrexone and oxymorphone were labeled in position 6 with fluorescein by coupling their hydrazone analogs with fluorescein isothiocyanate. Naloxone was also coupled in a similar way with rhodamine-B. The compounds thus obtained were: "6-FN", [1-(N)-fluoresceinyl naloxone thiosemicarbazone]; "6-FNX", [1-(N)-fluoresceinyl naltrexone thiosemicarbazone]; "6-FO", [1-(N)-fluoresceinyl oxymorphone thiosemicarbazone]; "6-RN", [1-(N)-tetramethylrhodaminyl-B naloxone thiosemicarbazone]. These compounds were tested for opioid receptor binding in rat brain synaptosomal plasma membranes and for biological activity on the guinea pig ileum. All compounds retained activity, showing some changes in affinity and binding profile compared to their parent compounds. "6-FN", for example, showed decreased (approximately 10x) affinity compared to naloxone in opiate displacement analysis but retained potency in displacement of opioid peptides. Antagonist activity of "6-FN" in the guinea pig ileum bioassay was about ten-fold less than that of naloxone.

Animals↗
PubMed1983

Functional studies with the opioid peptide dynorphin: acute effects of injections into the substantia nigra reticulata of naive rats.

When injected into the substantia nigra reticulata of naive rats, dynorphin-(1-17) caused a dose dependent contralateral rotation which was inhibited by naloxone in a dose dependent manner. Met-enkephalin injected in the same coordinates as the ones used with dynorphin also induced rotation but of lower intensity, while Leu-enkephalin did not elicit any significant response at the doses tested. D-amphetamine, injected subcutaneously 60 min after dynorphin, significantly enhanced the contralateral rotation induced by the intranigral administration of dynorphin. Experiments with dynorphin injections combined with D-amphetamine suggest that the dynorphin effects are mediated by neuronal loops involving dynorphin dopamine interactions.

Animals↗
PubMed1983

Depression and CSF endorphin fraction I: seasonal variation and higher levels in unipolar than bipolar patients.

Radioreceptor assay of endorphin Fraction I in the cerebrospinal fluid (CSF) of 92 inpatients suffering from major depression revealed the following: (1) clearly elevated levels as compared to normal control subjects, (2) higher level in unipolar than in bipolar patients, and (3) seasonal rhythms showing peaks in early fall for unipolar patients and late fall for bipolar patients. The annual pattern observed bears some resemblance to the known seasonal variations in the incidence of affective disorders and suicide.

Adult↗
PubMed1983

Capsaicin-induced depletion of substance P-like immunoreactivity in guinea pig sympathetic ganglia.

The distribution of substance P immunoreactive nerve fibers in guinea pig sympathetic ganglia was studied in normal and capsaicin-treated animals. A marked depletion of substance P-like immunoreactivity was observed in both pre- and paravertebral ganglia after capsaicin treatment. In the inferior mesenteric and pelvic ganglia, however, intensely fluorescent fibers surrounding some of the principal ganglion cells remain after capsaicin treatment. Ligation experiments on the inferior mesenteric ganglion indicate that the capsaicin-insensitive substance P immunoreactive fibers in this ganglion are of lumbar splanchnic origin. Whether or not they represent capsaicin-resistant primary afferent neurons is not known. The enkephalin, vasoactive intestinal polypeptide, cholecystokinin and bombesin immunoreactive fiber networks in the inferior mesenteric ganglion were also studied, and no differences were observed between normal and capsaicin-treated animals.

Animals↗
PubMed1983

Origin of peptide-containing fibers in the inferior mesenteric ganglion of the guinea-pig: immunohistochemical studies with antisera to substance P, enkephalin, vasoactive intestinal polypeptide, cholecystokinin and bombesin.

After different denervation procedures the guinea-pig inferior mesenteric ganglion was analysed by immunohistochemistry using antisera to substance P, enkephalin, vasoactive intestinal polypeptide, cholecystokinin and bombesin. The results demonstrate that each of the nerve trunks connected to the ganglion carries specific peptidergic pathways. Thus, the lumbar nerves contain substance P-immunoreactive primary afferent neurons, which to a large extent traverse the ganglion, and enkephalin-immunoreactive preganglionic neurons; the colonic nerves carry vasoactive intestinal polypeptide-, cholecystokinin- and bombesin-immunoreactive fibers from the distal colon to the ganglion; the hypogastric nerves contain vasoactive intestinal polypeptide-positive fibers from the pelvic plexus; and the intermesenteric nerve contains vasoactive intestinal polypeptide, cholecystokinin, substance P and enkephalin from divergent sources. By studying accumulations of peptides in ligated lumbar splanchnic, intermesenteric, hypogastric and colonic nerves the existence of these major peptidergic pathways was confirmed and evidence was obtained for additional, not so prominent, peptidergic projections. The results arae discussed in view of earlier morphological and physiological studies.

Animals↗
PubMed1983

Dynorphin is contained within hippocampal mossy fibers: immunochemical alterations after kainic acid administration and colchicine-induced neurotoxicity.

Antisera raised against synthetic dynorphin or [Leu5]enkephalin demonstrate immunostaining in hippocampal mossy fibers and in dentate granule cells. However, dynorphin immunoreactivity (ir) appears to be denser in immunocytochemical preparations and is quantitatively greater by radioimmunoassay than enkephalin-ir. Immunostaining with dynorphin antisera is eliminated by adsorption with 1-100 microM dynorphin-17 whereas immunostaining with enkephalin antisera is eliminated by adsorption with 1-100 microM [Leu5]enkephalin, dynorphin-17, dynorphin-(1-13), or alpha-neo-endorphin. Intrahippocampal colchicine injections, which selectively destroy dentate granule cells, significantly decrease the dynorphin-ir and enkephalin-ir levels in rat hippocampus. Intraventricularly administered kainic acid, which selectively destroys CA3-4 pyramidal cells, results in an increase of enkephalin immunostaining in mossy fibers and a significant increase in enkephalin-ir by radioimmunoassay in whole hippocampus. The enkephalin-ir cells and fibers in entorhinal/perirhinal cortex, which innervate rat hippocampus and dentate gyrus, do not contain dynorphin-ir.

Animals↗
PubMed1983

The PHI (PHI-27)/corticotropin-releasing factor/enkephalin immunoreactive hypothalamic neuron: possible morphological basis for integrated control of prolactin, corticotropin, and growth hormone secretion.

By using the indirect immunofluorescence technique, one and the same neuron in the parvocellular part of the paraventricular nucleus has been shown to stain with antisera against three different peptides: PHI (PHI-27), corticotropin-releasing factor (CRF), and enkephalin. This could explain the well-known parallel increase in plasma prolactin, corticotropin, and growth hormone levels--for example, under certain types of stress--as being due to a concomitant release of PHI-like, CRF-like, and enkephalin-like peptides from the same nerve endings in the median eminence. A hypothetical mechanism for the co-ordinated release of these three anterior pituitary hormones is discussed.

Adrenocorticotropic Hormone↗
PubMed1982

Glucocorticoid receptors, clinical characteristics, and implications for prognosis in chronic lymphocytic leukemia.

The cytoplasmic glucocorticoid-receptor (GR) content was analyzed in peripheral leukocytes from 52 nonselected patients with chronic lymphocytic leukemia (CLL). Forty-six patients had measurable GR levels. Six patients lacking measurable GR and seven of eight patients with a low GR content had inactive disease. However, there was no significant difference in average GR content between patients with progressive or nonprogressive disease. Twelve GR-positive patients were treated with prednisolone as the sole medication. Seven patients responded, some in several treatment sessions. There was no correlation between GR-content and clinical response. Thus, in our experience, cytoplasmic GR measurement has only limited predictive value.

Humans↗
PubMed1982

Endorphin levels in human cerebrospinal fluid during alcohol intoxication and withdrawal.

Levels of endorphins were determined in CSF from alcoholics while intoxicated or after 1 day, 1 week, and 3 weeks of abstinence, respectively, and from healthy volunteers. The level of endorphins was determined by a radioreceptor assay and two fractions were analyzed. With fraction 1, there were no significant differences between the groups, but the level was negatively correlated with the blood-alcohol level. The mean level of endorphin fraction 2 during the early withdrawal phase was significantly lower than those of the other groups. With respect to clinical conditions and monoamine metabolites, fraction 2 in early withdrawal correlated significantly to duration of abuse and age. During late withdrawal, fraction 1 level correlated to depressive symptoms and, after 3 weeks of abstinence, fraction 2 correlated to MOPEG levels. This study suggests that endorphin systems are affected during alcohol intoxication and withdrawal in alcoholics.

Adult↗