• Keine Ergebnisse gefunden

Histamine Methyltransferase in

N/A
N/A
Protected

Academic year: 2022

Aktie "Histamine Methyltransferase in "

Copied!
2
0
0

Wird geladen.... (Jetzt Volltext ansehen)

Volltext

(1)

l~eferate der elften Frfihjahrstagnng 395 Verst/~rkung der brfisken Bewegungen. Nach Vorbehandlung mit 3 mg/kg i.p. bzw. 2mal 3 mg/kg i.p. BOL-148 (27 und 3 Std vor LSD-25) zeigt sieh nach LSD-25 keine VerzSgerung des Eintritts des Erregten Schlafes mehr, die Intensit/~t der briisken Bewegungcn blcibt jedoch crhSht.

Die Resultate zeigen, dab BOL die ffir die erste Phase. typischen LSD- Wirkungen nicht besitzt. Das kann in Zusammenhang mit dem nach LSD, jedoch nicht nach BOL gesenktcn Umsatz yon Serotonin gebracht werden [1]. DaB diese erste Wirkungsphase yon LSD durch die Vorbe- handiung mit BOL weitgehend abgeschw/~cht werden kann, wird als Antagonismus auf der Ebene des Receptors intcrpretiert. Die fiir LSD und BOL gleichsinnigen Effekte sind schwieriger zu intcrpre$ieren, kSnnten jedoch mSglieherweise mit einer Beeinflussung zentral choli- nerger Regulationen zusammenh/~ngen.

Literatur

1. Lin, R. C., Ngai, S. H., Costa, E.: Science 166, 237 (1969).

2. Loew, D. M., Vigouret, J. M.: Un. Schweiz. Ges. exp. Biol., Mai 1969.

3. Michel, F., Klein, M., Jouvet, D., Valatx, J. L.: C. R. Soc. Biol. (Paris) 155, 2389 (1961).

Dr. D. M. Loew, Medizinisch-Biologische Forschung, Sandoz AG CH-4000 Basel

Histamine Methyltransferase in

Salivary Glands and Gastric Mueosa of Man, Dog,

Pig and Cow

Histaminmethyltransferase in Speicheldriisen nnd Magensehleimhaut yon Menseh, Hund, Sehwein und Rind

LOrEnZ, W., BA~T~, H., F~IF~L, G., W~RLw, E.

I n salivary glands and gastric mucosa high activities of histamine methyltranferase could be demonstrated (Table). The acitvity of the Table. Activities o/histamine methyltrans/erase in salivary glands and gastric mucosa Species Enzyme activities in p-moles of histamine metabolized per rain and

mg protein

Submaxillary Parotid Gastric mucosa

gland gland Fundus Corpus Antrum

Man 55.0 38,3:~ 1 2 , 7 171• 61:~ 30 209~ 51

Dog 159,7~45,8 29,3• 122 73~22 236•

Pig 120,3 ~ 68,8 65,3 ~: 14,0 242 • 83 216 ~ 15 465• 110

Cow 323,0 266,0 42 23 52

Mean values ~ S. D. from 2--7 determinations. In cows only the rennet-bag was investigated.

(2)

396 Referate der elften l~riihjahrstagung

enzyme was determined b y the disappearence of histamine in the incu- bation mixtures in the presence of S-adenosylmethionine according to Lorenz

et al.

[1]. Histamine was measured speetrofluorometrically after isolation by ion exchange chromatography on Dowex 50 WX-8 and the specificity of the method was proved as described in [1].

Histamine methyltransferase from pig antrum was purified 6-fold by ultracentrifugation and fractional precipitation b y ammonium sulfate (45--700/0 saturation). The enzyme showed the following properties:

Km

for histamine 2,3 9 10 -5 M,

Km

for S-adenosylmethionine 4,3 9 10 -5 M, pH-optimum 7,4. The occurrence of histamine methyltransferase in salivary glands and gastric mucosa supports the hypothesis t h a t his- tamine is a physiological chemostimulator of parasympathetic salivary and gastric secretion [2, 3].

t~e/erences

1. Lorenz, W, Barth, H., Werle, E.: 5[aunyn-Schmiedebergs Arch. Pharmak.

(in press) (1970).

2. Lorenz, W., Haubensak, G., Hutzel, M., Werle, E.: Naunyn-Schmiedebergs Arch. Pharmak. exp. Path. 260, 416 (1968).

3. -- Pfleger, K. : Klin. Wschr. 46, 57 (1968).

Priv.-Doz. Dr. W. Lorenz, Institut s Klinische Chemic und Klinische Biochemie der Universit~t Mfinchen D-8000 Miinchen 15, NuBbaumstraBe 20

Histamine Release in Man by Propanidid (Epontol| Gelatine (Haem- accel| Histalog, Pentagastrin and Insulin

Histamlnfreisetzung beim Menschen durch Epontol| Haemaecel|

Histalog, Pentagastrin und Insulin

LORENZ, W., ])OENICK~, A., Fv.~EL, G., Mv, SSM~R, K.,

~LEI]~R, 1~.,

B~N~ESCH, L., BARTH, H., KUSCHE, J., HUTZEL, 1VI.,

WERLE,

E.

I n the blood plasma and gastric juice of 9 healthy, male students, his- tamine concentrations of 0.8 • 0.3 ng[ml and of 24.0 • 9.1 ng/ml (basal secretion) were determined. Histamine was measured spectrofluoro- metrically after isolation b y ion exchange chromatography on Dowex 50 WX-8 followed b y extraction into alkaline butanol [2]. The speeifity of the method was proved by thinlayer chromatography, degradation b y diamine oxidase (pig kidney) and histamine methyltransferase (guinea-pig brain), and by bioassay (guinea-pig ileum and cat blood pressure) [2].

2, 5, 10 and 15 rain after the injection of Epontol| the histamine concen- tration of the venous plasma increased s i g l ~ c a n t l y by 100, 230, 160

Referenzen

ÄHNLICHE DOKUMENTE

In contrast, in mouse and due to the low number of circulating monocytes, macrophage differentiation starts from bone marrow cells to generate bone marrow-derived

For the examination of individual impacts of the studied substrates into the biosensor output signal, multivariate correlation analysis was used to construct a model enabling

However, compounds reported to release histamine from cells and thereby leading to arrhythmias in humans, namely morphine, ketamine, and fentanyl, failed to induce a more

examples of material stained with toluidine blue (Fig. Images of auditory nerve fibres for analysis were 2A), material labelled by bulk HRP injection into the

To demonstrate that the increased concentration of plasma histamine was actually free, pharmacologically active histamine, gastric acid secretion, heart or pulse rate

Histamine concentration in whole blood and plasma, basophils, gastric acid secretion, blood pressure and heart rate after intravenous injection of propanidid.. Mean

Summary. High histamine concentrations and histamine methyl transferase activity were demonstrated in the gastric mueosa of man, dog, pig and cow. Modified methods for

The speeifity of the method was proved by thinlayer chromatography, degradation b y diamine oxidase (pig kidney) and histamine methyltransferase (guinea-pig brain),