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Chokeberries and red cabbage owe their colour to anthocyanins, i.e. natural pigments which, in addition to their colouring properties, also have pro-health effects, including being powerful antioxidants. Researchers at our Institute have shown that these compounds cross the blood-cerebrospinal fluid barrier. This means that they can act beneficially in the environment of nerve cells, inhibiting processes leading, for example, to neurodegenerative diseases.

– Brain is an organ particularly susceptible to oxidative damage, which in turn can lead to neurological disorders such as strokes and neurodegenerative diseases (dementia, Alzheimer’s and Parkinson’s diseases). Consumption of antioxidant compounds such as anthocyanins can be a preventive measure. We have shown for the first time that they cross the blood-cerebrospinal fluid barrier – points out Prof. Wiesław Wiczkowski, head of Metabolomics Laboratory.  

IMBALANCE

The starting point for his team’s research was the desire to expand our knowledge of the absorption, metabolism, distribution and excretion of anthocyanins present in food, including the possibility that these natural pigments and their metabolites – once ingested – reach the brain.

The second reason was the increasing number of scientific reports on the negative impact of modern society’s lifestyle – full of stress, lack of physical activity and poor diet. This contributes to increased levels of oxidative stress, which is characterised by an imbalance between oxidants (harmful free radicals when present in excess) and antioxidants (neutralising the former).

This state can lead to many diseases and a faster ageing of the body. The brain is also affected, as it is particularly sensitive to oxidative damage due to its high oxygen utilisation rate and high levels of unsaturated fatty acids.

As a preventive measure, scientists recommend the consumption of biologically active compounds with strong antioxidant properties. These include anthocyanins – natural pigments found in chokeberries and red cabbage.

However, in order for these compounds to have a chance to bring a beneficial effect to nerve cells, they must 'enter’ the nerve cell environment, e.g. the cerebrospinal fluid. For this to happen, they have to pass one of the barriers (blood-brain or blood-cerebrospinal fluid) that are designed to protect the central nervous system from toxic substances, among other things.

BREAK THROUGH

Researchers from the Institute have examined this and showed that anthocyanins from chokeberries and red cabbage can cross this barrier.

– We have shown that anthocyanins cross the cerebrospinal fluid and may therefore, theoretically, take part in all processes happening in the environment of nerve cells, especially those limiting oxidative processes – reports Prof. Wiczkowski.

Out of more than 600 anthocyanins present in the plant kingdom, the researchers investigated several forms of cyanidin – the most common form of anthocyanins. The cyanidin derivatives selected for the study had different structures (resulting from their combination with various sugars and phenolic acids; the more such combinations, the greater the structure of the compound).

– In addition to checking whether anthocyanins cross the barrier, we also wanted to see if and what role the molecular size and type of attached substituents (i.e. sugars and phenolic acids) play in this process. It turned out that the barrier crossing of anthocyanins is indeed determined by the molecular weight of these pigments and the type of substituents – explains the scientist.

The concentration of anthocyanins in the cerebrospinal fluid was detected at nanomol (10-9 mole) levels. – Therefore, further studies are needed to verify whether antioxidant mechanisms will occur at such low concentrations – he adds.

Wiesław Wiczkowski argues that, regardless of this last point, it is still a good idea to consume plenty of fresh fruits and vegetables, especially those rich in anthocyanins (i.e. those of blue, purple, red and orange colours).
– A regular intake of anthocyanins also benefits the composition of our microflora, the functioning of our eyesight and numerous organs. Importantly, no negative effects of these pigments have been demonstrated so far – concludes the scientist.

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The research work was carried out within the framework of the already completed project entitled 'Studies on the permeation of anthocyanins and their metabolites across brain barriers in the context of prevention strategies for neurodegenerative diseases’, funded by the National Science Centre, whose initiator and manager was Prof. Wiesław Wiczkowski. For more details, see the scientific publications available below:

The Blood−Cerebrospinal Fluid Barrier Is Selective for Red Cabbage Anthocyanins and Their Metabolites

The blood-cerebrospinal fluid barrier features different permeability to cyanidin-3-galactoside and cyanidin-3-diglucoside-5-glucoside and their metabolites circulating in blood

Chokeberry anthocyanins and their metabolites ability to cross the blood-cerebrospinal fluid barrier

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The research formed the core of Dr. Natalia Płatosz’s PhD thesis (under the supervision of Prof. Wiesław Wiczkowski), for which she was awarded the prestigious 'START’ scholarship for young scientists by the Foundation for Polish Science in 2023. Read more.

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On a macro scale, animal bodies are already well known to humans. However, when we descend to a lower level – to the micro scale – it becomes clear how many puzzles there still are. Dr Anna Majewska from the Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences in Olsztyn has contributed to the completion of this knowledge. She characterised a protein discovered a few years ago called SNAD1, which turned out to be a new important player in fish immunology.

– A new protein called SNAD1 from the AID/APOBEC group of proteins may revolutionise our knowledge of fish immunity, shedding new light on all previously known mechanisms that fish use to fight pathogens and adapt to their environment. It is also a potential tool for the rapid detection of diseases in fish and for monitoring their welfare – emphasises Dr Anna Majewska from the Department of Gamete and Embryo Biology of the IARFR PAS in Olsztyn.

The SNAD1 protein was discovered in 2018 (initially under a different name) by Dr Mariola Dietrich, also from the IARFR PAS. This discovery resulted in further research, led by Dr Anna Majewska, in collaboration with scientists from the Institute of Bioorganic Chemistry of the Polish Academy of Sciences in Poznań, and the University of Veterinary Medicine Hannover, Germany.

This protein belongs to an interesting group of proteins that mutate the genetic code. – During evolution, a whole range of different mechanisms have evolved that could repair errors (mutations) in our DNA or RNA. And this group of proteins does the opposite: it causes these mutations! But it alters the genetic information in the nucleic acids in such a way as to give rise to specific antibodies that are capable of attacking or inactivating viruses or bacteria – explains the researcher.

This occurs in the biochemical process of deamination of cytidine to uridine catalysed by SNAD1. Deaminases are enzymes, and cytidine and uridine are biological active substances involved in cellular metabolism. Everything takes place within the nucleic acids, which store the organism’s genetic information and mediate protein production.

This protein is found in a variety of fish species. Thirteen of its variants have been demonstrated in carp, indicating its multifunctional role.

– In our study, we found that the SNAD1 protein is sensitive to a change in temperature to cooler temperatures – in which case its expression increases by up to a thousand-fold. This also happens in response to exposure to a virus or bacteria. This indicates that the protein plays an important role in immune processes. Thus, if a fish becomes infected with a bacterium or virus, the protein is involved in the host defence process by encoding genes in the RNA in such way that they produce an antibody to the specific pathogen – says the researcher.

In a paper recently published in the journal Frontiers in Immunology, the researcher showed that the SNAD1 protein is involved in immune processes. However, it is necessary to understand it in more detail, among other biochemical aspects. Further research steps in this direction are already planned.

Once the SNAD1 protein has been further characterised, it could in future be used as a marker of fish welfare.
– If we know that the expression level of this protein increases in specific situations, we will be able to react immediately and stop the disease at an early stage. This could contribute to more efficient fish breeding and be a potential tool for treating various types of diseases through genetic engineering,” points out Anna Majewska.

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The research was conducted as part of a project from the NCN OPUS 22 competition entitled „In search of the role of carp cold acclimation protein 31 (Cap31) – a new player in fish immunity against microbes?”, led by Prof. Andrzej Ciereszko – head of the Department of Gamete and Embryo Biology of IARFR PAS in Olsztyn.

Dr Lucyna Budźko and Prof. Marek Figlerowicz from the Institute of Bioorganic Chemistry of the Polish Academy of Sciences and Dr Mikołaj Adamek from the University of Veterinary Medicine Hannover (Germany) participated in the described research on the SNAD1 protein.

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Partially defatted poppy seeds, a by-product of poppyseed oil cold pressing, are a source of health-promoting dietary components, indicates a scientist from the Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences in Olsztyn. Consuming them in the form of a dietary supplement (approximately 5.5 tablespoons per day) can beneficially alter lipid metabolism and support the treatment of obesity and its complications.

– In our research, we wanted to check to what extent this by-product of poppyseed oil pressing can still be useful for consumption and act as a valuable dietary component in the context of diet-related diseases. Such a form of poppy seeds is less calorific and may even be richer in some health-promoting compounds than native seeds – says dr. Adam Jurgoński, professor of IAR&FR PAS in Olsztyn.

A paper addressing this topic has been published in the prestigious journal Scientific Reports.

LIKE TWO PEAS IN A POD

Poppy seeds are a popular ingredient in Polish cuisine, especially added to bread, cakes and festive dishes. They are rich in nutrients – almost half of them consist of fatty acids present in the oil fraction (including polyunsaturated fatty acids, which are important components of our diet). They also contain dietary fibre, protein and various antioxidant compounds. 

Poppyseed oil is usually cold-pressed. This process involves mechanically separating the oil from the seeds at a low temperature, allowing for additional protection of the nutritionally valuable components. Poppyseed oil is high in linoleic acid (omega-6 acid), which is essential for the proper functioning of our body, although its intake is usually excessive in relation to other essential fatty acids present in our diet (i.e. omega-3 acids).

A by-product of the cold-pressed oil is partially defatted poppy seeds, also known as oilcakes. – It turns out that reducing this dominant oil fraction increases the proportion of dietary fibre, protein and some biologically active compounds. Thus, these seeds remain a product that is still valuable from a nutritional point of view – points out Adam Jurgoński.

POPPY VERSUS BODY LIPIDS

Researchers investigated the effect of dietary supplementation with partially defatted poppy seeds on the development of obesity.

The study was conducted on a laboratory animal model characterised by increased body weight. Overweight and obesity cause disturbances in the metabolism of lipids and glucose, and this in turn can lead to diet-related diseases such as certain cardiovascular diseases, steatohepatitis or type 2 diabetes.

– We have shown that relatively small dietary supplementation with defatted poppy seeds (for humans, this is about 5.5 tablespoons of these seeds per day) improves lipid metabolism in the body by reducing triglycerides in the blood and liver, and preventing increased visceral fat accumulation. We have also tentatively identified the molecular mechanism underlying these beneficial changes – reports Adam Jurgoński.

Elevated triglyceride levels and excess visceral fat are associated with an increased risk of the previously mentioned diet-related diseases.

According to the researcher, the new knowledge may be useful to nutritionists as well as food and supplement manufacturers, as it points to new possibilities for the use of the by-product in question, e.g. in the form of a pro-health 'filling’ to poppy seed cake (the seeds are already ground and do not require additional milling, like the regular ones).

– Therefore, poppy seeds in their partially defatted form can be an interesting ingredient in our diet, which turns out to be beneficial for the functioning of the body affected by metabolic disorders related to obesity – concludes Adam Jurgoński.

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Cross-breeding, cryopreservation (freezing) of semen and creating a bank of reproductive cells and coral larvae are all examples of scientific strategies to enhance the resilience of coral reefs and protect these invaluable ecosystems from the negative effects of climate change.

– Due to climate change and other anthropological factors, we have already lost more than half of all coral reefs. Although corals have remarkable mechanisms of resilience, the rate of climate change (increasing water temperature and decreasing pH level) exceeds their natural ability to adapt – emphasises dr. Radosław Kowalski from the Department of Gamete and Embryo Biology of the Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences in Olsztyn.

The scientist investigates reefs near the Japanese island of Okinawa. He has been studying coral reproduction for more than a decade. – Back then, the topic of coral reef conservation was niche. Today, after a growing number of publications and projects, it is becoming clear that the problem is severe, and the need to find a strategy to protect these invaluable ecosystems supporting the diversity of marine life is indeed urgent – he adds.

The researcher points out that besides an increase in water temperature, a significant negative impact on coral reefs is also caused by a decrease in the ocean’s pH, i.e. its acidification. This is linked to an increase in carbon dioxide emissions into the atmosphere, which then dissolves in the oceans. – This is why, in recent decades, the natural pH level of the oceans has dropped from 8.2 to 8.1. However, this inconspicuous one-tenth means a one-third increase in ocean acidification! Corals build their skeletons from calcium carbonate, which is 'taken up’ from the water, but this mechanism stops at a pH of 7.9. In addition, water acidification reduces the reproductive capacity of corals – says Radosław Kowalski.

And although corals look more like plants, they are animals (invertebrates). They are found in equatorial regions.

INTERSPECIES BREEDING

Modern coral reefs, including the Great Barrier Reef in Australia, formed about 8-10,000 years ago. As the reefs are mainly found around the equator, where the annual temperature changes were not very pronounced, their biological cycle synchronised with the phases of the moon – depending on the species, they approach spawning on a specific full or new moon counting from the beginning of the year.

– This synchronisation allows these non-migratory animals to ensure contact with gametes (reproductive cells) of the same species by releasing them en masse into the ocean, usually during a single night. However, climate warming has resulted in temperatures during the coral spawning season that their physiology has not previously encountered. And while thermals did not previously play a major regulatory role in coral reproduction, we are now seeing a significant modulating effect. For this reason, unsynchronised coral spawning is now occurring annually on the reef – the researcher points out.

This is resulting in a noticeable increase in interspecies hybrids. An example is the crossing of species from deeper parts of the ocean, where there is cooler water, with those from shallower parts with warmer water. The result is a hybrid with mediated characteristics that is able to inhabit larger spaces. – This fascinating mechanism shows how corals try to adapt to change –  explains Radosław Kowalski.

Interspecies breeding also has considerable potential as a tool for scientifically assisted evolution, as combining the gametes of different coral species offers the possibility of obtaining a hybrid, e.g. with increased thermal tolerance (to changes in water temperature) or with specific desirable adaptive traits to changing environmental conditions.

Dr. Radoslaw Kowalski is conducting such research with a team of Japanese scientists from the University of the Ryukyus in Okinawa.

Recently, the researcher has been focusing on the cross-breeding possibilities of aquarium-reared species.
– From my observations, I have noticed that corals bred in aquaria are subject to enormous environmental pressure, so that there is a lot of natural selection, and only the strongest individuals survive. We want to cross naturally occurring species with those bred in aquaria and see if their hybrid will be more adaptable – he says.

GENETIC INSURANCE POLICY

Another strategy to protect coral reefs is the cryopreservation of coral sperm, i.e. their storage at ultra-low temperatures. This method enables the preservation of genetic material, acting as a genetic insurance policy that can be used in the future to restore and rebuild coral reefs.

– Creating a bank of gametes and coral larvae is one of the biggest challenges for scientists working on this topic. We are already able to cryopreserve sperm, but after thawing, the eggs are still needed for fertilisation. With larvae, there would not be such a problem, but here we still need to improve the method of freezing them – Radosław Kowalski points out.

The semen cryopreservation method can also be helpful in the process of crossbreeding between species, for example, by allowing semen taken from resistant individuals to be transported from aquaria to coral reefs, where it can be used to create more resistant individuals of a particular species.

ACTION NEEDED

– The state of coral reefs around the world is critical; these ecosystems are on the brink of collapse. Research into strategies to protect reefs is therefore needed as never before. However, I always stress that even the most cutting-edge scientific solutions are no substitute for our everyday actions, such as saving energy or water, which can make a real difference in protecting our planet – Radosław Kowalski concludes.

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The composition and structure of scars vary depending on gender, scientists from the Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences in Olsztyn have shown. Tissues in men are characterised by a higher content of type 1 collagen and elastin. Women, on the other hand, showed a higher accumulation of type 3 collagen, characteristic of scarless wound healing.

– Our work is the first publication to demonstrate differences between men and women over 50 in the structure of cutaneous scars. The obtained results may contribute to the development of research on new pharmaceuticals taking into account gender differences in patients – emphasises Professor Barbara Gawrońska-Kozak, leader of the Regenerative Biology Team at the Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences in Olsztyn.

Her team’s research focuses on understanding the molecular basis of the repair mechanisms controlling the healing process of skin wounds with scar formation (reparative healing), but also in terms of regenerative (scarless), healing.

SCARS ARE NECESSARY

Scars are 'mementos’ left on the skin after various types of injury, such as cuts (e.g. post-operative wounds), lacerations, or burns. The rate of wound healing can be affected by many factors including age, gender, body area, and wound size.

– Scar healing is beneficial for the organism, as it restores, relatively quickly, the protective function of the skin, preventing the penetration of pathogenic microorganisms into the injured area. Unfortunately, disorders in the healing process may result in numerous complications, such as non-healing wounds or hypertrophic scars, explains Prof. Barbara Gawrońska-Kozak.

In the animal world, there is also scarless wound healing, called regenerative or ideal wound healing. – This is the process of regaining the appearance and functionality of uninjured skin. This type of wound healing rarely occurs in mammals. One example of regeneration observed in humans is the healing of skin wounds during the first two trimesters of fetal life. When an injury occurs during this time (e.g. during surgery in the womb), the skin heals scarlessly, with no trace of the injury. Interestingly, research by scientists from the UK has shown that in elderly people, healing of skin injuries lasts longer, but with the formation of a smaller, more delicate scar, with a macroscopic and microscopic appearance resembling uninjured skin – says Dr. Marta Kopcewicz of the Regenerative Biology Team at the IAR&FR PAS.

COLLAGEN TYPE MAKES A DIFFERENCE

To better understand the molecular basis of scar formation and to see what is the role of gender in this process, researchers from Prof. Barbara Gawrońska-Kozak’s team decided to analyse samples of uninjured and scarred skin, collected from men and women over 50. The tissues were taken from the patient’s abdominal areas (with their written consent and under the supervision of the local ethics committee). Doctors from the Voivodal Specialistic Hospital in Olsztyn were involved in the research.

– It has long been known that intact skin varies by gender: in men, among other things, it is thicker, with higher amounts of type 1 collagen, and with more sebaceous glands secreting  sebum. Our research indicates that there are also gender-dependent differences in scars – points out Prof. Barbara Gawrońska-Kozak.

Thus: men have more type 1 collagen and elastin in abdominal skin scars than women, which is in line with what is known about differences in uninjured skin. Women, on the other hand, showed higher expression levels of genes specific to the adipose tissue present in the skin.

Interestingly, we observed a higher accumulation of type 3 collagen in women’s scars – a type of collagen that is associated with regenerative wound healing. – These are only the first indications which require further research, but we have presented for the first time that women may have a greater potential for regenerative healing than men – says Dr. Marta Kopcewicz.

The researchers also histologically assessed the structure of scars. Their analyses showed that the arrangement of collagen fibres and their thickness also depended on gender: they are finer in women.

CHANCE FOR NEW MEDICINES

Earlier studies by Dr. Marta Kopcewicz, conducted on animals, showed that age and gender have the greatest impact on the wound healing process. – Our latest research, already conducted on human tissues, has confirmed this – emphasizes the researcher.

According to Prof. Barbara Gawrońska-Kozak, the results may contribute to further research into potential pharmacological products that take gender differences into account. – In addition, our study contributes to important knowledge about scarring in people over 50, when the skin is different from that of young people, who are usually the research group in studies in this area – concludes the scientist.

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An article presenting the results of the described study was published in the journal Biomedicines and is available here.

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Linking the body’s individual response to vitamin D with immunocompetence, or generally speaking: potent immunity, may be the key to explaining the mechanism of how vitamin D protects against the most common diseases and at the same time promotes healthy aging.

– The results of our research suggest that immunocompetence describes not only an individual’s ability to resist pathogens and parasites, but also to fight non-communicable diseases and the aging process itself – emphasizes Prof. Carsten Carlberg from the Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences in Olsztyn, a world-famous biochemist specializing in research on vitamin D.

The publication with the research results was published in the journal „Nutrients” . The co-author of the article is Dr. Eunike Velleuer from the University of Düsseldorf (Germany).

AN IMPORTANT REGULATOR

Vitamin D affects the functioning of the entire body via its modulatory actions on the immune system. In contrast, vitamin D deficiency causes malfunctions of the immune system, leading to, among others increased susceptibility to infectious diseases or autoimmune diseases.

Based on the results of his previous research, prof. Carlberg proposed dividing the population into three groups according to the level of the body’s response to vitamin D: high, mid and low responders. A high level of responsiveness means that the body is able to make a maximum use of the effects of vitamin D (it has a high molecular response to vitamin D), and that in such group of people the need for supplementation is lower than in people from the low responder group.

This division is a starting point for understanding the scientist’s subsequent research. This time he looked at the relationship between the above-mentioned grouping and the processes occurring at the molecular level in cells sensitive to changes in vitamin D – in the context of the aging process.

VITAMIN D IN THE AGING PROCESS

Aging is a natural and inevitable process of accumulation of molecular and cellular damage, which leads to defective functions of cells, tissues and organs that weaken the entire human body. Some profound changes in the immune system at the molecular level contribute to a decline in immunocompetence, i.e. the ability of the human body to respond appropriately to an exposure to an antigen.

As overall immunocompetence declines during aging, the relative number of immune cells decreases.

– However, there are differences between people in this population group, i.e. some people have a higher percentage of immune cells than average, and some have a lower percentage. Therefore, in the same age group there are people with higher immunological resistance and others with lower ones. Therefore, it can be assumed that in the first group the rate of aging is slower and the incidence of diseases is lower, while in the second group accelerated aging and a higher rate of disease should be observed – explains Prof. Carlberg.

On this basis, it can be assumed that the relationship between the level of the body’s individual response to vitamin D and its immunocompetence plays a significant role in the aging process.

Prof. Carlberg and his team use this relationship to develop a mechanism explaining how vitamin D affects the epigenetic programming of immune cells, in particular monocytes and their derived cells. Details can be found in the source publication.

– Our study results suggest that vitamin D is an important element of healthy aging, not only for maintaining bones and skeletal muscles in good condition, but also for the homeostasis of the immune system. We also believe that a sufficient amount of vitamin D, adapted to the individual needs of the body, should stabilize immune resistance, protect against many diseases and maintain a low rate of aging – concludes the scientist.

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Prof. Carlberg is the leader of the scientific group dealing with nutrigenomics at the Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences in Olsztyn.

More information about the Nutrigenomics Laboratory of IARFR PAS in Olsztyn and the latest research of the ERA Chair WELCOME2 team can be found here.

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