Research Directions and labs
Cancer research

A. Zajakinas labs

Anna Zajakina , Dr. biol.

Senior researcher
Phone: +371 67808200


The Cancer Gene therapy group specializes in development of clinically translatable methods for cancer treatment based on gene therapy vectors and combination of different strategies including chemotherapy and immunotherapy. The group uses a wide variety of alphaviral vectors as promising candidates for transient intratumoral delivery of therapeutic genes. Being recently established the group has generated a strong collaborative network with experts in complementary fields: chemists, bioinformatics, immunologists. Currently, the group leads two collaborative projects focused on delivery of alphaviral RNA into tumor, using classical way through infection with recombinant virus (i) and alternative way through viral RNA delivery by magnetic nanoparticles and polyfunctional pyridinium amphiphiles (ii). Moreover, the group has a strong interest in unraveling fine mechanisms of alphavirus infection and identification of factors of tumor microenvironment for efficient targeting of cancer cells.

 Selection of therapeutic genes

Tumor-associate macrophages (TAM) constitute a key regulatory component of tumor microenvironment. The most advanced approach to instruct macrophages to stop supporting tumor progression and to act against tumor is their functional reprogramming. Therefore, we are focusing our efforts on delivery of cytokine genes to induce polarization of TAM into pro-inflammatory tumour suppressive M1 phenotype.

Combination with advanced chemotherapeutics

Combined therapy is a good platform for clinical application. In that context, alphaviral vectors possess a significant potential to be translated into clinics as adjuvant/neoadjuvant treatment to block tumor recovery after chemotherapy. We continue pre-clinical evaluation of alphaviral vectors in combination with standard and advanced chemotherapeutics in order to find the optimal treatment strategy (i), to overcome drug resistance (ii) and to understand the mechanism of possible synergistic effects (iii).

Tumor targeting

The mechanism of alphavirus infection and possible regulation of entry, which is important for tumor targeting, is currently controversial. We have analysed the full proteome of mouse melanoma cells susceptible and unsusceptible to alphavirus infection. The identified genes and pathways potentially could serve as a platform for regulation of tumor environment to facilitate virus tumor targeting. On the other hand, to enhance the efficiency of the delivery and transgene production in tumor, we propose to apply re-administration strategy using non-viral delivery of alphaviral RNA. This approach will help to overcome the anti-vector immune response caused by virus administration. To deliver alphaviral RNA we use targeted liposomes and magnetic nano-particles with attached oligonucleotides complementary to RNA. Fluorescent dyes will be used to track particle distribution in vivo. Moreover, magnetic nanoparticles adsorbed on the surface of the virus will be tested for the ability to address virus to tumor sites with higher efficiency by magnetic field.

Scientific Staff

Dace Skrastiņa , Dr. biol.,

Dace Skrastiņa , Dr. biol.

Leading expert in Laboratory animal science, senior researcher
Phone: +371 25137484

Jeļena Vasiļevska , MSc. biol.,

Jeļena Vasiļevska , MSc. biol.

Research assistants
Phone: +371 67808200

Baiba Ķūrēna ,

Baiba Ķūrēna

Laboratory assistant
Phone: +371 67808200

Olga Trofimova ,

Olga Trofimova

Laboratory assistant
Phone: +371 67808200

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Mājas lapas izstrādi finansēja ERAF aktivitātes projekts Nr. 2010/0196/2DP/ "Latvijas biomedicīnas pētījumu integrācija Eiropas zinātnes telpā".