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Medizin-Nobelpreisträger des Jahres 2000 benannt

PRESSEMITTEILUNG Karolinska Institutet 9.10.2000

Die Nobelversammlung am Karolinska Institutet hat heute beschlossen, den Nobelpreis des Jahres 2000 in Physiologie oder Medizin

Arvid Carlsson, Paul Greengard und Eric Kandel

gemeinsam für ihre Entdeckungen betreffend "Signalübertragung im Nervensystem" zu verleihen

ZUSAMMENFASSUNG

Im Hirn des Menschen gibt es mehr als hundert Milliarden Nervenzellen. Sie stehen durch ein außer ordentlich kompliziertes Netzwerk von Nervenfasern miteinander in Verbindung. Botschaften von einer Nervenzelle zu einer anderen werden mit Hilfe verschiedener Signal substanzen übertragen. Diese Signalübertragung erfolgt in besonderen Kontaktpunkten, den Synapsen. Eine einzige Nervenzelle kann Tausende von Kontaktpunkten zu anderen Nervenzellen haben.

Die diesjährigen drei Nobelpreisträger in Physiologie oder Medizin haben bahnbrechende Entdeckungen betreffend eine bedeutungsvolle Art der Signalübertragung zwischen verschiedenen Nervenzellen gemacht, die sogenannte langsame synaptische Transmission. Diese Entdeckungen waren entscheidend für das Verständnis der normalen Hirnfunktionen und wie Störungen dieser Signal bertragung neurologische und psychische Krankheiten verursachen können. Diese Erkenntnisse haben dann zur Entwicklung neuer Arzneimittel geführt.

Arvid Carlsson, Farmakologiska institutionen, Göteborgs universitet, wird belohnt für seine Entdeckung des Dopamins als Signalsubstanz im Hirn und die große Bedeutung des Dopamins für die Kontrolle unserer Bewegungen. Seine Forschungsergebnisse führten dann weiter zu der Erkenntnis, daß die Parkinsonsche Krankheit durch Dopaminmangel in bestimmten Teilen des Hirns verursacht wird, und daß man ein effektives Arzneimittel (L-dopa) gegen diese Krankheit herstellen konnte. Arvid Carlsson hat eine Reihe von Folgeentdeckungen gemacht, die die Rolle des Dopamins im Hirn noch weiter charakterisiert.. Er hat u.a. Wirkungsmechanismen für Arzneimittel nachgewiesen, die bei der Behandlung von Schizophrenie verwendet werden.

Paul Greengard, Laboratory of Molecular and Cellular Neuroscience, Rockefeller University, New York, wird belohnt für seine Entdeckung der Einwirkungen von Dopamin und einer Reihe anderer Signalsubstanzen auf das Nervensystem. Die Signalsubstanzen beeinflussen zuerst einen Rezeptor auf der Nervenoberfläche. Dadurch wird eine Kaskade von Reaktionen ausgelöst, die gewisse „Schlüssel proteine" beeinflussen, die ihrerseits verschiedene Funktionen in der Zelle regulieren. Form und Funktion der Proteine verändern sich durch Hinzufügen oder Wegnahme von Phosphatgruppen (Phosphorylierung bzw. Dephosphorylierung). Durch diesen Mechanismus können die Signalsubstanzen ihre Botschaft zwischen den Nervenzellen übertragen.

Eric Kandel, Center for Neurobiology and Behavior, Columbia University, New York, wird belohnt für seine Entdeckung, wie die Effektivität der Synapsen verändert werden kann und mit welchen mole laren Mechanismen das erfolgt. Anhand des Nervensystems einer Meeresschnecke als Modell, hat er gezeigt, daß Veränderungen der Funktion der Synapsen zentral für Lern- und Erinnerungs vermögen sind. Für die Entstehung einer Form von Kurzzeitgedächtnis spielt die Phosphorylierung in der Synapse eine wichtige Rolle. Für die Entstehung eines Langzeit gedächtnisses ist außerdem die Neubildung von Proteinen erforderlich, die u.a. dazu führen, daß sich Form und Funktion der Synapse ändern.

Die PE auch hier zu lesen

Karolinska Institutet - Press Release October 9, 2000

Summary

In the human brain there are more than hundred billion nerve cells. They are connected to each other through an infinitely complex network of nerve processes. The message from one nerve cell to another is transmitted through different chemical transmitters. The signal transduction takes place in special points of contact, called synapses. A nerve cell can have thousands of such contacts with other nerve cells.

The three Nobel Laureates in Physiology or Medicine have made pioneering discoveries concerning one type of signal transduction between nerve cells, referred to as slow synaptic transmission. These discoveries have been crucial for an understanding of the normal function of the brain and how disturbances in this signal transduction can give rise to neurological and psychiatric diseases. These findings have resulted in the development of new drugs.

Arvid Carlsson, Department of Pharmacology, University of Gothenburg is rewarded for his discovery that dopamine is a transmitter in the brain and that it has great importance for our ability to control movements. His research has led to the realization that Parkinson's disease is caused by a lack of dopamine in certain parts of the brain and that an efficient remedy (L-dopa) for this disease could be developed. Arvid Carlsson has made a number of subsequent discoveries, which have further clarified the role of dopamine in the brain. He has thus demonstrated the mode of action of drugs used for the treatment of schizophrenia.

Paul Greengard, Laboratory of Molecular and Cellular Science, Rockefeller University, New York, is rewarded for his discovery of how dopamine and a number of other transmitters exert their action in the nervous system. The transmitter first acts on a receptor on the cell surface. This will trigger a cascade of reactions that will affect certain "key proteins" that in turn regulate a variety of functions in the nerve cell. The proteins become modified as phosphate groups are added (phosphorylation) or removed (dephosphorylation), which causes a change in the shape and function of the protein. Through this mechanism the transmitters can carry their message from one nerve cell to another.

Eric Kandel, Center for Neurobiology and Behavior, Columbia University, New York, is rewarded for his discoveries of how the efficiency of synapses can be modified, and which molecular mechanisms that take part. With the nervous system of a sea slug as experimental model he has demonstrated how changes of synaptic function are central for learning and memory. Protein phosphorylation in synapses plays an important role for the generation of a form of short term memory. For the development of a long term memory a change in protein synthesis is also required, which can lead to alterations in shape and function of the synapse.

ARVID CARLSSON

Dopamine - an important transmitter

Arvid Carlsson performed a series of pioneering studies during the late 1950's, which showed that dopamine is an important transmitter in the brain. It was previously believed that dopamine was only a precursor of another transmitter, noradrenaline. Arvid Carlsson developed an assay that made it possible to measure tissue levels of dopamine with high sensitivity. He found that dopamine was concentrated in other areas of the brain than noradrenaline, which led him to the conclusion that dopamine is a transmitter in itself. Dopamine existed in particularly high concentrations in those parts of the brain, called the basal ganglia, which are of particular importance for the control of motor behavior.

Figure 1.
Dopamine nerve pathways in the brain. Arvid Carlsson showed that there were particularly high levels of the chemical transmitter dopamine in the so called basal ganglia of the brain, which are of major importance for instance for the control of our muscle movements. In Parkinson's disease those dopamine producing nerve cells whose nerve fibers project to the basal ganglia die. This causes symptoms such as tremor, muscle rigidity and a decreased ability to move about.

In a series of experiments Arvid Carlsson used a naturally occurring substance, reserpine, which depletes the storage of several synaptic transmitters. When it was given to experimental animals they lost their ability to perform spontaneous movements. He then treated the animals with L-dopa, a precursor of dopamine, which is transformed to dopamine in the brain. The symptoms disappeared and the animals resumed their normal motor behavior. In contrast, animals that received a precursor of the transmitter serotonin did not improve the motor behavior. Arvid Carlsson also showed that the treatment with L-dopa normalized the levels of dopamine in the brain.

Drugs against Parkinson's disease
Arvid Carlsson realized that the symptoms caused by reserpine were similar to the syndrome of Parkinson's disease. This led, in turn, to the finding that Parkinson patients have abnormally low concentrations of dopamine in the basal ganglia. As a consequence L-dopa was developed as a drug against Parkinson's disease and today still is the most important treatment for the disease. During Parkinson's disease dopamine producing nerve cells in the basal ganglia degenerate, which causes tremor, rigidity and akinesia. L-dopa, which is converted to dopamine in the brain, compensates for the lack of dopamine and normalizes motor behavior.

Antipsychotic and antidepressive drugs
Apart from the successful treatment of Parkinson's disease Arvid Carlsson's research has increased our understanding of the mechanism of several other drugs. He showed that antipsychotic drugs, mostly used against schizophrenia, affect synaptic transmission by blocking dopamine receptors. The discoveries of Arvid Carlsson have had great importance for the treatment of depression, which is one of our most common diseases. He has contributed strongly to the development of selective serotonin uptake blockers, a new generation of antidepressive drugs.

PAUL GREENGARD

Slow synaptic transmission

Towards the end of the 1960's it was known that dopamine, noradrenaline and serotonin were transmitters in the central nervous system but knowledge about their mechanism of action was lacking. Paul Greengard receives the Nobel Prize for his discoveries of how they exert their effects at the synapse.

Transmitters such as dopamine, noradrenaline, serotonin and certain neuropeptides transmit their signals by what is referred to as slow synaptic transmission. The resulting change in the function of the nerve cell may last from seconds to hours. This type of signal transmission is responsible for a number of basal functions in the nervous system and is of importance for e.g. alertness and mood. Slow synaptic transmission can also control fast synaptic transmission, which in turn enables e.g. speech, movements and sensory perception.

Phosphorylation of proteins changes the function of nerve cells
Paul Greengard showed that slow synaptic transmission involves a chemical reaction called protein phosphorylation. It means that phosphate groups are coupled to a protein in such a way that the form and function of the protein is altered. Paul Greengard showed that when dopamine stimulates a receptor in the cell membrane this causes an elevation of a second messenger, cyclic AMP, in the cell. It activates a Protein Kinase A, which is able to add phosphate molecules to other proteins in the nerve cell.

The protein phosphorylation affects a series of proteins with different functions in the nerve cell. One important group of such proteins form ion channels in the membrane of the cell. They control the excitability of the nerve cell and make it possible for the nerve cell to send electrical impulses along its axons and terminals. Each nerve cell has different ion channels, which determine the reaction of the cell. When a particular type of ion channel is phosphorylated the function of the nerve cell may be altered by, for example, a change in its excitability.

DARPP-32 - a central regulatory protein
Paul Greengard has subsequently shown that even more complicated reactions occur in particular nerve cells. The effects of the transmitters are elicited by a cascade of phosphorylations and dephosphorylations (that is, phosphate molecules are added or removed from the proteins). Dopamine and several other transmitters can influence a regulatory protein, DARPP-32, which indirectly changes the function of a large number of other proteins. The DARPP-32 protein is like a conductor directing a series of other molecules. When DARPP-32 is activated it affects several ion channels altering the function of particular fast synapses.

Paul Greengard's discoveries concerning protein phosphorylation have increased our understanding of the mechanism of action of several drugs, which specifically affects the phosphorylation of proteins in different nerve cells.

ERIC KANDEL

Sea slug, a model system for learning

A phosphorylation of proteins has great importance also for the discoveries for which Eric Kandel is rewarded, that is for revealing molecular mechanisms, important for the formation of memories. Eric Kandel started to study learning and memory in mammals, but realized that the conditions were too complex to provide an understanding of basic memory processes. He therefore decided to investigate a simpler experimental model, the nervous system of a sea slug, Aplysia. It has comparatively few nerve cells (around 20.000), many of which are rather large. It has a simple protective reflex that protects the gills, which can be utilized to study basic learning mechanisms.

Figure 4. A sea slug, Aplysia, has a simple nervous system and a gill withdrawal reflex that Eric Kandel has utilized to study learning and memory.

Eric Kandel found that certain types of stimuli resulted in an amplification of the protective reflex of the sea slug. This strengthening of the reflex could remain for days and weeks and was thus a form of learning. He could then show that learning was due to an amplification of the synapse that connects the sensory nerve cells to the nerve cells that activate the muscle groups that give rise to the protective reflex.

Short and long term memory
Eric Kandel showed initially that weaker stimuli give rise to a form of short term memory, which lasts from minutes to hours. The mechanism for this "short term memory" is that particular ion channels are affected in such a manner that more calcium ions will enter the nerve terminal. This leads to an increased amount of transmitter release at the synapse, and thereby to an amplification of the reflex. This change is due to a phosphorylation of certain ion channel proteins, that is utilizing the molecular mechanism described by Paul Greengard.

A more powerful and long lasting stimulus will result in a form of long term memory that can remain for weeks. The stronger stimulus will give rise to increased levels of the messenger molecule cAMP and thereby protein kinase A. These signals will reach the cell nucleus and cause a change in a number of proteins in the synapse. The formation of certain proteins will increase, while others will decrease. The final result is that the shape of the synapse can increase and thereby create a long lasting increase of synaptic function. In contrast to short term memory, long term memory requires that new proteins are formed. If this synthesis of new proteins is prevented, the long term memory will be blocked but not the short term memory.

Synaptic plasticity, a precondition for memory
Eric Kandel thus demonstrated that short term memory, as well as long term memory in the sea slug is located at the synapse. During the 1990's he has also carried out studies in mice. He has been able to show that the same type of long term changes of synaptic function that can be seen during learning in the sea slug also applies to mammals.

The fundamental mechanisms that Eric Kandel has revealed are also applicable to humans. Our memory can be said to be "located in the synapses" and changes in synaptic function are central, when different types of memories are formed. Even if the road towards an understanding of complex memory functions still is long, the results of Eric Kandel has provided a critical building stone. It is now possible to continue and for instance study how complex memory images are stored in our nervous system, and how it is possible to recreate the memory of earlier events. Since we now understand important aspects of the cellular and molecular mechanisms which make us remember, the possibilities to develop new types of medication to improve memory function in patients with different types of dementia may be increased.

Quelle - mit weiteren Grafiken

Die Welt, 10.10.2000
Die Superhirne
Zwei Amerikaner und ein Schwede erhalten den Nobelpreis 2000 für Medizin. Die Arbeiten der Wissenschaftler liegen bis zu 40 Jahre zurück und haben die Grundlage für die moderne Neurobiologie geschaffen

Die Welt, 10.10.2000
Reine Nervensache
Eine nobelpreiswürdige Erkenntnis: Wie die Abermilliarden Neuronen im Gehirn miteinander sprechen

Der Tagesspiegel, 10.10.2000
Medizin-Nobelpreis : Ein Trio mit wunderbarem Gedächtnis
Arvid Carlsson, Paul Greengard und Eric Kandel bekommen die Auszeichnung

Die weiteren Nobelpreisträger 2000

Homepage des Nobelpreises

Homepage Greengard

Uni Göteborg

Homepage Kandel

MN-366

Autor: Manfred Ronzheimer

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