Клетка и жизнь - Коллектив авторов -- Биографии и мемуары

migrating non-muscle cell, where its next front is?» Thus, they replaced the familiar question about the energy spent on locomotion with the novel question about the spatial information guiding it.

It was not an academic question. Yuri Vasiliev answered it in very practical terms. The beautiful flower of Col-chicum autumnale had protected itself for millions of years from grazing animals by spiking its leaves and fruits with a poisonous alkaloid, called colchicine. Since the drug inhibits cell division, it had become an important component of cancer chemotherapy. Yuri Vasiliev, since 1963 a Professor of Biology at the Cancer Institute at the State University of Moscow, had seen its use in medicine many times. However, he wanted to understand its function better. In 1970 he found that animal cells exposed to colchicine not only stopped dividing, they also stopped directed locomotion, even though all parts of their bodies continued to move quite well in the presence of the drug.

Until that point, nobody had proposed a link between cell division and locomotion. To solve the riddle, scientific minds were needed, who ignored the conventional wisdom, which tried to explain animal cell movement with muscle proteins, and cell division with chromosome behavior. Together with Israel Gelfand, Yuri Vasiliev found the common denominator. Colchicine disassembled the microtubules, one of the three major components of the «cytoskeleton».

The discovery explained the inhibition of cell division, because the mitotic spindle consisted predominantly of microtubules. What was entirely new was the finding that microtubules also played a central role during the long time in a cells life between one division and the next. During this so-called «interphase» microtubules were indispensible for designating a part of a non-muscle cells body as its front. More generally speaking, the «polarity» of non-muscle cells depended on their intact microtubules. Correspondingly, the disassembly of their microtubules prevented fibroblast from expressing directed locomotion, and epithelial cells from differentiating between their apical and basal faces.

In 1970, Yuri Vasiliev and Israel Gelfand published their finding that microtubules linked the deployment of biochemical energy by animal cells to their ability to handle spatial information. It was one of those rare discoveries that points future research into entirely novel directions. At the same time it needed not fear that the more sophisticated concepts and advanced experimental methods of that very future would ever overturn it. Arguably, Yuri Vasiliev s finding shares this exceptional quality with Ivan Pavlovs (1849–1936) discovery of classical conditioning.

What may be equally impressive as the discovery itself, may be the atrocious conditions under which Yuri Vasiliev and his students had to work. I saw them first hand in October 1986, when Israel Gelfand invited me to speak at a Workshop organized by the Academy of Science, USSR. At that time I also gave a lecture to the joint group of Yuri Vasiliev and Israel Gelfand at Moscow State University. They showed me their totally antiquated labs. They showed me the single ancient microscope that all of them had to share, and the small film camera that they used for their timelapse observations of cell movements.

On the other hand, only once in my life did I have the privilege of lecturing to a group of such power and life of intellect. That, too, reminded me of Pavlov. All the equipment he had available to make one of the most momentous discoveries of neurobiology were a few dogs, a few feeding bowls, and a handheld bell.

Come to think of it, Galileos telescope had pathetic lenses. Mendel had only a small flower bed of pea plants. Henrietta Leavitt showed the way to measure the true size of the universe with a magnifying glass and a stack of old photographs of the sky. Barbara McClintock had an old microscope, a knife, and a small plot of land for her maize plants to prove the genomes life and creativity. Rosalind Franklin had only a self-build X-ray tube with no radiation protection. Watson and Crick had no equipment at all. I wonder whether it is always like that.

Meeting Jury Vasiliev, Moscow, June 1984

Benny GEIGER. Professor, Department of Immunology Weizmann Institute of Science, Rehovot, Israel.

About 17 years ago, towards a celebration of Jury Vasiliev s 75th birthday, I have sent a personal letter to Jury Vasiliev, describing my reflections on our meeting in Moscow, about 20 years earlier, during and a bit after the 16th FEBS Congress. This was one, out of many scientific meetings that I attended throughout my academic career, but it is, for sure, the one which is the most memorable and dear to my heart: Meeting Jury Vasiliev.

November 16, 2003

Dear Jury,

Our personal acquaintance dates back to nearly 20 years ago. We met on the occasion of the 16th Congress of the Federation of the European Biochemical Societies, taking place in Moscow, to which I was invited. I still wonder how many and what kind of strings you had to pull in the not-so-friendly Soviet Academy in order to bring me, a young boy from a problematic country, to Moscow. We shared a scientific session (see below), had similar scientific passions, but beyond all these, this was the start of a very special friendship.

I am not sure I have ever told you — but this visit was truly one of the strongest, most moving and memorable events of my life. Moscow, for me, was a remote and mysterious place, unacces-sible, hidden behind an iron curtain, almost unreal. At the same time, the place and the culture were something very close, almost familiar,