Emeriti

  • Prof. Avri Ben-Ze'ev

    Adhesion-mediated signaling during cancer progression

    We study the changes in the mechanisms that regulate the coordination between cell-cell adhesion and signaling during cancer invasion and metastasis.  Special emphasis is devoted to the following topics:

    1. The dual role of beta-catenin in WNT signaling (as co-transcription activator) and as a key mediator of cell-cell adhesion linking adhesion receptors to the cytoskeleton.
    2. Identification and role of WNT/beta catenin target genes in regulating cell motility, epithelial to mesenchymal transition (EMT), and cancer cell invasion and metastasis.
    3. Investigation of genes induced by adhesion-mediated (WNT and others) signaling that are also expressed at increased levels in normal stem cells and during cancer progression.  We are studying the role of such genes in both tissue homeostasis and cancer progression.
  • Prof. Alexander D. Bershadsky

    Studies the basic processes of self-organization of the most abundant cellular protein, actin, into filamentous structures that comprise the cytoskeleton, an intracellular network determining cell shape, generating cell motility, and strengthening adhesion of cells to each other and to extracellular matrix. These processes depend on the assembly of the actin filaments mediated by special proteins known as formins, filament movement mediated by molecular motors, myosins, and filament anchorage at the cell adhesion sites. Actin self-organization in the cell is coordinated by diverse signaling molecules, among which small G proteins from the Rho and Arf families and protein tyrosine kinases are also within sphere of interest of the laboratory. The main direction of the recent research focuses on understanding actin cytoskeleton- and adhesion-dependent mechanisms of cell mechanosensitivity, and the establishment of left-right cell asymmetry.

    Currently working in collaboration with Mechanobiology Institute, Singapore

  • Prof. Eli Canaani

    Investigates the MLL gene and its protein products, in order to understand their biochemical activities and the mechanism by which they trigger leukemia. Leukemias associated with rearrangement of the MLL gene account for the majority of acute lymphocytic and myelocytic leukemias in infants, and in therapy-related leukemias.

  • Prof. Zvi Kam

    We develop and apply methodologies of Light Microscope Image Acquisition and of Quantitative Analysis to cell biology. Studies with collaborators, to which these methodologies are applied include:

    • Dynamic behavior of osteoclasts sealing zone (Left Figure: sealing zone quantification for drug screening, work of Dr. Sarit Batsir).
    • Individual and collective cell migration in 2D and 3D environments (Middle Figure: computer analysis of wound-healing essay, work of Yair Elisha and Prof. Benny Geiger)
    • Platelets spreading and activation.
    • Lamelapodia dynamics.
    • Robust algorithm for tracking cells (Right Figure: the NetFlow graph optimization for tracking cells in time-lapse movies, proposed by Prof. Adi Shamir)
  • Prof. Varda Rotter

    The role of p53 in maintaining genomic plasticity
    • Mutant p53 gain of function
    • p53 Loss of Heterozygosity (LOH)
    • Role of p53in the life of stem cells
    • Role of p53 in the life of cancer stem cells
    • p53 in inflammation metabolism
    • p53  regulating endocrine loops
    • p53 based therapy
    website of Prof. Varda Rotter varda.rotter@weizmann.ac.il
  • Prof. Yehiel Zick

    Cross talk between insulin resistance, animal lectins and bone remodeling

    We combine mouse models, cell biology and analysis of signaling pathways to focus on:

    • Role of animal lectins (particularly galectin-8) as regulators of bone remodeling and insulin action
    • Novel elements (Ndfip1; Otub2, TM7SF3) that modulate survival of pancreatic beta cells
    • IRS (insulin receptor substrate) proteins, insulin resistance, and beta cell function
    website of Prof. Yehiel Zick yehiel.zick@weizmann.ac.il

In Memorium

  • Prof. Abraham Amsterdam
    1940 - 2021

    Prof. Avraham Amsterdam, known to his friends and colleagues as Avrumi, passed away on 1.1.2021, at the age of 81 years.

    Avrumi was born in Haifa. Already as a young child he excelled in music and particularly in playing the piano, and for a number of years he deliberated whether to continue on the track of becoming a professional musician. However, he eventually decided to become a scientist, leaving music as a hobby.

    After completing his PhD at the Hebrew University in Jerusalem in 1971, Avrumi went to New York for a post-doc at the Rockefeller University. There, he worked with Prof. James Jamieson and Prof. George Palade, who has been described as "the most influential cell biologist ever", and who in 1974 was awarded the Nobel Prize in Physiology and Medicine. Palade was particularly known for the innovative use of electron microscopy in cell biology. Avrumi was able to acquire great expertise in this methodology and applied it extensively in the course of his career as an independent researcher.

    Avrumi started his lab at the Weizmann Institute at the end of 1973. While he worked initially on acetylcholine receptors, he rapidly turned his interest to the ovary and particularly to ovarian granulosa cells, an area in which he became a world leader. Among his many achievements, he was the first to establish immortalized granulosa cell lines that retained their differentiated features and have become a key tool in the study of this important class of ovarian cells.

    Even after he formally retired and became a professor emeritus, Avrumi continued his research with great passion and dedication, taking his microscopy expertise to a new area: identification of distinct populations of putative cancer-initiating cells in sections from tumors of ovarian cancer and pancreatic cancer.

    In parallel with his rich scientific career, Avrumi continued to cultivate his love for music, mainly through voluntary performances to audiences of hospitalized sick children and residents of old people’s homes. Volunteering was always important to him, and he did it with passion that was second only to his passion for science.

    During the last years of his life, Avrumi’s health deteriorated seriously. Nevertheless, almost until his last months, he remained enthusiastic about science and cultivated hopes for writing an influential review that would challenge the dogma and introduce new approaches to cancer diagnosis.

    His departure is a great loss to his family and friends, to the members of the Department of Molecular Cell Biology and to the scientific community.

  • Prof. David Yaffe
    1929 - 2020

    Prof. David Yaffe started his independent career as a researcher at the Weizmann Institute of Science in 1961 , his focus was on the differentiation mechanisms of muscle cells. David quickly became one of the leading scientists in the muscle researchers’ community, especially because of the knowledge he obtained and developed in growing undifferentiated muscle cells (myoblasts), in rat muscle culture, and then mouse muscle culture.

    David developed the first model of mammalian cellular differentiation which has permitted many dramatic quantum-jump and paradigm-shift discoveries

    The cell line that David and his colleagues developed (C2 cells), that had myogenic capabilities, became the classic research model in the field of muscle cells differentiation (myogenesis) to this day, and contributed to the discovery of molecules involved in this process. David showed that the myoblasts go through a classification process which is irreversible, during which they fuse together, to make muscle fibers.

    David, as will attest many of the researchers in the field, has become one of the forefathers of the modern myogenesis field, which held many interfacing characteristics with the field of stem cells, which have many biomedical implications. David also organized a series of conventions in Israel, which turned into EMBO conventions of the developing muscle field, that most of the senior ‘muscle community’ remembers and cherished to this day.

    On top of his esteemed scientific work, David was a pioneer, a humble, straight, and generous person, always passionate and inquisitive. His modesty and his love of the kibbutz life and his family, David also loved nature and plants very much, and especially strawberry and fig trees, which he nurtured in his garden at the kibbutz.

    He leaves a lasting legacy that flows from his specific science contributions and also from his force of personality.

  • Prof. Givol David
    1929 - 2012

    He devoted his career at Weizmann to investigating the tumor suppressor gene p53, the most frequently mutated gene in all cancers, and focused on mechanisms that activate p53 and the way p53 activates target genes, using microarrays. He also studied the effect of p53 on different chemotherapies and the connection between stem cells and cancer, exploring the properties of "cancer stem cells" that are responsible for the propagation of malignant tumors. He isolated such stem cells from leukemia and glioblastoma and compares gene expression profiles of stem and non-stem tumor cells and test differential drug response in these cells.
    Prof. Givol passed away on 22/12/2012, and is greatly missed.

  • Prof. Gad Yagil
    1929 - 2009

    Prof. Gad Yagil was a physical chemist interested in biology, who combined theory and experimental work. He developed the theoretical concepts underlying enzyme induction and repression and explored the relation between DNA sequences and their unwinding properties. He also applied tools from information theory to analyze the complexity of DNA sequences and other biological systems. He was a kind and collegial scientist who is greatly missed.