News archive

After the egg has been fertilized by a sperm, the surrounding egg coat tightens, mechanically preventing the entry of additional sperm and the ensuing death of the embryo. This is according to a new study led by researchers at Karolinska Institutet and published in the journal Cell. The work also explains how mutations in egg coat proteins can cause female infertility and may eventually lead to new contraceptive methods.

Regular erections could be important for maintaining erectile function, according to a new study on mice published in Science by researchers at Karolinska Institutet. “We discovered that an increased frequency of erections leads to more fibroblasts that enable erection and vice versa, that a decreased frequency results in fewer of these cells,” says principal investigator Christian Göritz.

A new method, developed at Karolinska Institutet, KTH Royal Institute of Technology and SciLifeLab, can identify unique immune cell receptors and their location in tissue, a study published in the journal Science reports. The researchers predict that the method will improve the ability to identify which immune cells contribute to disease processes and open up opportunities to develop novel therapies for numerous diseases.

Alexandra Argyriou, doctoral student at the Department of Medicine, Solna and Mireia Cruz De los Santos, doctoral student at the Department of Oncology and Pathology, have been awarded the Cilla Weigelt Scholarship for outstanding research in molecular mechanisms related to rare and under-treated diseases. The scholarships, 50,000 SEK each, will be awarded on November 13.

Although a simple molecule, nitric oxide is an important signal substance that helps to reduce blood pressure by relaxing the blood vessels. But how it goes about doing this has long been unclear. Researchers at Karolinska Institutet in Sweden now present an entirely novel principle that challenges the Nobel Prize-winning hypothesis that the substance signals in its gaseous form. Their findings are presented in the journal Nature Chemical Biology.

Cardiogenic growth factors play important roles in heart development and in a new study published in the scientific paper Nature Communications from researchers at Karolinska Institutet shows how stem cell therapeutics and mRNA technology are beginning to converge offering major improvements in vascularization, survival, expansion, differentiation, and ultimately the function of human stem cell grafts.

A new study led by researchers at Karolinska Institutet has examined how T cells of the immune system are affected by weightlessness. The results, which are published in the journal Science Advances, could explain why astronauts’ T cells become less active and less effective at fighting infection.

Researchers at Karolinska Institutet have identified a group of nerve cells in the mouse brain that are involved in creating negative emotional states and chronic stress. The neurons, which have been mapped with a combination of advanced techniques, also have receptors for oestrogen, which could explain why women as a group are more sensitive to stress than men. The study is published in Nature Neuroscience.

Solving the logic of life. This may seem like an overwhelming task. But for Professor Rickard Sandberg, this is the objective.

Our skin contains specialised long-lived killer cells that protect against intruders. Researchers at Karolinska Institutet and the University of Copenhagen have now identified how these cells are formed, and shown that high levels of memory killer cells in cancer tissue correlate with a better survival rate in people with melanoma. The study is published in the journal Immunity.

The 5D Heart Patch Project, led by Prof Kenneth Chien, has identified human ventricular progenitor (HVP) cells that can create self-assembling heart grafts in vivo. The research has the potential to offer hope to millions of people suffering from heart failure.

A hitherto unknown mechanism for DNA folding is described in a study in Nature published by researchers from Karolinska Institutet and the Max Planck Institute for Biophysics. Their findings provide new insights into chromosomal processes that are vital to both normal development and to prevent disease.

In a recently published article published in Nature Reviews Drug Discovery, Professor Yihai Cao’s research group at the Department of Microbiology, Tumor and Cell Biology, charts the information about drug development for the treatment of a number of human diseases by targeting new blood vessel formation.

Three professors at Karolinska Institutet – Gonçalo Castelo-Branco, Maria Eriksson and Björn Högberg – have been awarded ERC Advanced Grants, one of the most prestigious and competitive EU funding schemes. The funds, totaling more than 8 million euros, will support the use of innovative basic research methods to further our understanding of disease mechanisms and the tiniest building blocks of DNA.

A new study published in Nature reports that a technology known as spatial omics can be used to map simultaneously how genes are switched on and off and how they are expressed in different areas of tissues and organs. This improved technology, developed by researchers at Yale University and Karolinska Institutet, could shed light on the development of tissues, as well as on certain diseases and how to treat them.

KI Professor Rickard Sandberg has been awarded the Torsten Söderberg Academy Professorship in Medicine by the Royal Swedish Academy of Sciences, a donation of 10 million Swedish kronor for a five-year period. Rickard Sandberg has developed methods that make it possible to deeply penetrate the human genome by studying genes in individual cells.

Two KI researchers – Simon Elsässer and Magda Bienko – have been awarded 2022 European Research Council (ERC) Consolidator Grants totaling four million euro (nearly 45 million Swedish kronor). The funds will support two ambitious basic research projects that aim to further our understanding of the complex nature of our cells.

Nano-sized membrane bubbles known as extracellular vesicles activate the immune system in mice and seem to render their tumours sensitive to a type of immunotherapy drug called a checkpoint inhibitor. This is according to a new study published in Cancer Immunology Research by researchers at Karolinska Institutet.

Losing too much weight when infected with COVID-19 has been linked to worse outcomes. Now, researchers at Karolinska Institutet have discovered that SARS-CoV-2 infection fuels blood vessel formation in fat tissues, thus revving up the body’s thermogenic metabolism. Blocking this process by using an existing drug curbed weight loss in mice and hamsters that were infected with the virus, according to the study published in the journal Nature Metabolism.

Among patients with kidney cancer, the activity of four specific genes in the cancer cells seems to be able to predict the risk of the tumour spreading and the patient’s chances of survival. This is shown by researchers from Karolinska Institutet in a preclinical study published in Nature Communications.

Researchers at Karolinska Institutet present new insights into the role of small molecules, microRNAs, in skin wound healing. The study, published in the journal eLife, highlights possible future approaches for treating venous ulcers, a common type of chronic non-healing wounds.

A study from Karolinska Institutet, among others, presents the theory that egg-sperm fusion, a crucial feature of sexual reproduction in plants and animals, may have originated from an ancient form of genetic exchange that involved the fusion of bacteria-like microorganisms called archaea. The results, published in Nature Communications, may open an entirely new perspective on the evolution of sex.

Researchers at Karolinska Institutet in Sweden show how a molecule that they have identified stimulates the formation of new insulin-producing cells in zebrafish and mammalian tissue, through a newly described mechanism for regulating protein synthesis. The results are published in Nature Chemical Biology.

New findings reveal an advanced, unexpected two-way communication between the function and organization of chromosomes in the cell nucleus. Previous research shows that the organization of chromosomal DNA into loops regulates gene reading (transcription) and chromosome copying (replication). The new results show that, in turn, transcription and replication control chromosome looping, thus revealing a new interplay known to be important in avoiding diseases, such as cancer.

Measuring the full complement of small molecules (the metabolome) can provide important insight into the health status of an individual. The measurement of metabolites is also the main theme of the recently established KI core facility for small molecule mass spectrometry (KI-SMMS). We talk with Craig Wheelock, Head of the newly founded Unit of Integrative Metabolomics in the Institute of Environmental Medicine (IMM), about the role of metabolomics in personalized health care.

Using advanced microscopy techniques, researchers at Karolinska Institutet and Stockholm University have visualized in unprecedented detail the machinery that the cells’ powerhouses, the mitochondria, use to form their proteins. The results, which are published in Nature, raise hopes of more specific antibiotics and new cancer drugs in the future.

Researchers at Karolinska Institutet, Germany’s Technical University of Munich (TUM) and AstraZeneca, among others, have identified a unique therapeutic approach with the potential to restore heart function following a heart attack. The new findings rely on so-called human ventricular progenitor (HVP) cells to promote novel heart tissue and reduce scarring after injury. This pre-clinical study is published in the journal Nature Cell Biology.

Congratulations to Christine Delisle Nyström, who has been appointed Assistant Professor and docent in Nutrition, and to Rongrong Fan, who has been appointed docent in Cell- and Molecular Biology!

Researchers at Karolinska Institutet have identified key signalling pathways that when blocked by existing drug candidates limit reproduction of the Crimean-Congo haemorrhagic fever (CCHF) virus. The findings, published in the journal eLife, offer hope for patients affected by this potentially deadly disease.

A research group at Karolinska Institutet in Sweden has analysed how certain immune cells known as innate lymphoid cells (ILCs) develop into mature cells that play a part in inflammatory bowel disease (IBD). The findings could pave the way for more effective treatments against IBD, a disease that causes considerable suffering and that is linked to an increased risk of colorectal cancer. The results are published today in the journal Science Immunology.

High blood glucose is responsible for several complications in type 1 and type 2 diabetes. Researchers at Karolinska Institutet have identified a new antidiabetic substance that preserves the activity of insulin-producing beta cells and prevents high blood glucose in mice. The study is published in the journal Science Translational Medicine.

Researchers at Karolinska Institutet have identified a protein that protects against breast tumour growth and that can be linked to a better prognosis in breast cancer patients. The results, which are published in the journal Nature Communications, may contribute to the development of new therapies for difficult-to-treat forms of breast cancer.

The causes of complex diseases can be identified by representing them in the form of mathematically produced networks. This method was used to find bacteria that drive atopic dermatitis, for example.

While the large proportion of our genome that does not instruct our cells to form proteins has been harder to study than protein-coding genes, it has been shown to have vital physiological functions. Scientists at Karolinska Institutet have now developed new high-precision tools able to identify what these noncoding sequences do. The study, which is published in the journal Nature Genetics, may eventually contribute to the development of new, targeted drugs.

A new study from Karolinska Institutet in Sweden shows how certain RNA molecules control the repair of damaged DNA in cancer cells, a discovery that could eventually give rise to better cancer treatments. The study is published today in the journal Nature Communications.

In a new study published in Science, researchers at Yale University, in collaboration with researchers at Karolinska Institutet, have developed a technique that gives very precise information about the location of activated and inactivated genes in a specific tissue. This can provide important knowledge about how different tissues develop and how epigenetic regulation contributes to the development of disease.

Three research group leaders at Karolinska Institutet receive European Research Council Proof of Concept (ERC PoC) 2022 grants, which are awarded to researchers who already have funding from the ERC and now wish to develop the innovative potential of their discoveries. Projects funded at KI include working towards commercialisation of a new sequencing method and scaling up production of artificial spider-silk textiles.

An international team of scientists, including from Karolinska Institutet, has discovered a means of identifying the risk of breast and ovarian cancer by analysing cell samples from the cervix. By measuring epigenetic changes in cervical samples from over a thousand women, the researchers have found two unique signatures for breast and ovarian cancer. The results are presented in two papers in the journal Nature Communications.

An international team of researchers led by Karolinska Institutet in Sweden have discovered that a cell type in the central nervous system known as oligodendrocytes might have a different role in the development of multiple sclerosis (MS) than previously thought. The findings, published in the journal Neuron, could open for new therapeutical approaches to MS.

An international metastudy led by researchers at Karolinska Institutet has identified a specific gene variant that protects against severe COVID-19 infection. The researchers managed to pinpoint the variant by studying people of different ancestries, a feat they say highlights the importance of conducting clinical trials that include people of diverse descents. The results are published in the journal Nature Genetics.

From our first breath, our lungs are exposed to microorganisms, such as bacteria and viruses. Thanks to immune cells in the lungs, so-called macrophages, we are protected from most infections at an early age. In a new study published in the Journal of Experimental Medicine, researchers from Karolinska Institutet show how lung macrophages develop; new findings that can help to reduce organ damage and that are significant for the continued development of important lung disease treatments.

In a new study, researchers at Karolinska Institutet have identified the presence of a specific connection between a protein and an lncRNA molecule in liver cancer. By increasing the presence of the lncRNA molecule, the fat depots of the tumor cell decrease, which causes the division of tumor cells to cease, and they eventually die. The study, published in the journal Gut, contributes to increased knowledge that can add to a better diagnosis and future cancer treatments.

A protein that protects cells from DNA damage, p53, is activated during gene editing using the CRISPR technique. Consequently, cells with mutated p53 have a survival advantage, which can cause cancer. Researchers at Karolinska Institutet have found new links between CRISPR, p53 and other cancer genes that could prevent the accumulation of mutated cells without compromising the gene scissors’ effectiveness. The study, published in Cancer Research, can contribute to tomorrow’s precision medicine.

Muscle cells in patients with type 2 diabetes have a disrupted biological clock discover researchers at the University of Copenhagen and Karolinska Institutet. The findings, published in the journal Science Advances, suggest that treatments for type 2 diabetes may be more or less effective depending on the time of day they are given.

During the pandemic, it has become evident that people with cardiovascular disease and obesity are at much higher risk of developing very severe, even fatal COVID-19 disease. Researchers at Karolinska Institutet have identified some metabolic processes that SARS-CoV-2 uses to attack lung tissue. The results, which are published in Molecular & Cellular Proteomics, could one day be used to treat COVID-19, and potentially for other viruses like the Crimean-Congo hemorrhagic fever virus and HIV-1.

Researchers at Karolinska Institutet have participated in a large international research project that has identified all cell types in the motor cortex, the part of the brain that controls movement. The research has resulted in a detailed cell atlas presented in a large special package of scientific articles in Nature today. The long-term goal of the collaboration is to create a cell atlas of the whole brain in order to increase knowledge of brain diseases and contribute to better treatments.

It is well known that obesity affects the body's insulin production and over time risks leading to type 2 diabetes and several other metabolic diseases. Now researchers at Karolinska Institutet in Sweden have found further explanation for why fat cells cause metabolic morbidity. The study, published in Nature Medicine, may have an impact on the treatment of comorbidity in obesity with already available drugs.

Our bodies can fine-tune the immune response to an infection and make it proportional to the threat at hand. New research from Karolinska Institutet describes how B lymphocytes, the immune cells that make antibodies, choose between different cell fates to balance the magnitude of the acute immune response and the memory response that protects against future threats. The study, published in Immunity, may contribute to the optimisation of vaccines to fight viruses or other pathogens.

It is well known that fat cells can influence our sensitivity to insulin. Now, researchers at Karolinska Institutet in Sweden have discovered that there are three different subtypes of mature fat cells in white adipose tissue and that it is only one of these, called AdipoPLIN, that responds to insulin. The findings may be relevant for future treatments of metabolic diseases such as Type 2 diabetes.

Researchers at Karolinska Institutet have developed a detailed molecular atlas of the fetal development of the brain. The study published in the top journal Nature is based on so-called single-cell technology and has been done on mice. In this way, researchers have identified almost 800 different cells that are active during fetal development – many times more than previously known.