Knut the polar bear death riddle solved by researchers
Knut the polar bear death riddle solved by researchers

Knut the polar bear death riddle solved by researchers (Video)

Knut, the star polar bear who was hand-reared at Berlin zoo after his mother rejected him, had a type of auto-immune inflation of the brain that is found in humans, researchers said on Thursday.

Researchers said that the non-infectious condition probably had nothing to do with his captivity or the fact that he was hand-reared by a devoted zoo keeper, who himself tragically died of a heart attack at the age of 44. Wild polar bears may also suffer the same brain disorder as Knut but just never get diagnosed, the researchers said.

“Until now, this autoimmune disease has only been known in humans. In this illness, the body’s immune system overreacts and produces antibodies which damage nerve cells instead of fighting against pathogens,” said Harald Prüss of the German Centre for Neurodegenerative Diseases in Berlin.

A study, published in the journal Scientific Reports, found that the autoimmune disease attacked the anti-NMDA receptors within Knut’s brain, which are involved with the transmission of signals between nerve cells.

“Epileptic seizures, hallucinations and dementia are among the possible symptoms….In humans this disease is relatively responsive to medical treatment,” Dr Prüss said.

Knut’s life was a modern fairy tale, or horror story depending on your point of view. His first public appearances as a cute white cub saw attendance figures at Berlin Zoo soar by 30 per cent. He became so famous that celebrity photographer Annie Leibovitz was dispatched by Vanity Fair to take his picture, which was superimposed next to one of Hollywood legend and eco-warrior Leonardo DiCaprio standing on ice.

Knut’s fame spread far and wide, especially after an animal rights activist suggested that it was cruel to raise a polar bear in captivity and it would have been better to have allowed him to die – a suggestion that caused outrage among Knut’s many adoring fans.

Silver coins were minted in his honour in Germany and stamps bearing his image were printed in Azerbaijan. Plastic replicas, DVDs and assorted tat followed, and he was deemed such a commercial success that one zoo attempted to sue another over who owned the commercial rights to Knut, whose name was registered as a trade-mark.

However, it all ended tragically when Knut suffered a fit in full view of several hundred zoo visitors on 19 March 2011, causing him to slide under the water of a pool in the outdoor enclosure that he shared with a handful of other polar bears at Berlin Zoo.

Although encephalitis was suspected, it is not until now that scientists have been able to confirm the precise type of autoimmune disease that caused the seizure.

“We were quite intrigued by this result. The anti-NMDA receptor encephalitis has been described only very recently in humans. Clearly it is also of importance for other mammals. We are relieved to have finally solved the mystery of Knut’s disease,” said Professor Alex Greenwood of the Leibniz Institute for Zoo and Wildlife Research.

“He captured the public’s imagination by being abandoned by his mother and being hand-raised. Then you had the tragic death of the zoo keeper himself. Knut drew in 15 million visitors and then had a very spectacular death that was very public,” Professor Greenwood said.

“We’ve happened to end the story now by explaining how he died. There’s some closure now,” he said.


  • About News

    Web articles – via partners/network co-ordinators. This website and its contents are the exclusive property of ANGA Media Corporation . We appreciate your feedback and respond to every request. Please fill in the form or send us email to: [email protected]

    Check Also

    China: Organic molecule remnants found in dinosaur fossils

    China: Organic molecule remnants found in dinosaur fossils

    Organic molecule remnants found in nuclei of 125-million-year-old dinosaur cells. A team of scientists from …

    Leave a Reply