Navigation Links
Generation of a severe memory-deficit mutant mouse by exclusively eliminating the kinase activity of CaMKIIalpha

Ca2+/calmodulin-dependent protein kinase II alpha (CaMKII alpha) is an enzyme that adds phosphates to a variety of protein substrates to modify their functions. CaMKII alpha is enriched in the hippocampus, the memory center of the brain, and is believed to be an essential mediator of activity-dependent synaptic plasticity and memory functions. However, the causative role of the enzymatic activity of CaMKII alpha in such processes has not been demonstrated yet, because this enzyme has multiple protein functions other than the kinase activity. A Japanese research group, led by Dr Yoko Yamagata of the National Institute for Physiological Sciences, Japan, has successfully generated a novel kinase-dead mutant mouse of the CaMKII alpha gene that completely and exclusively lacks its kinase activity. They examined hippocampal synaptic plasticity and behavioral learning of the mouse, and found a severe deficit in both processes. They reported their findings in the Journal of Neuroscience, published on June 10, 2009.

The research group successfully generated a novel CaMKII alpha (K42R) knock-in mouse that completely lacks the kinase activity of CaMKII alpha, and examined the effects on structural, functional, and behavioral expression of synaptic memory. In the K42R brain, tetanus-induced long-term potentiation (LTP), a proposed cellular mechanism of memory, and sustained postsynaptic spine enlargement, a structural basis for LTP, were both impaired, whereas dynamic postsynaptic movement of CaMKII alpha protein was preserved. In addition, the K42R mouse showed a severe deficit in inhibitory avoidance learning, a form of memory dependent on the hippocampus. The research group concluded that the mutant mouse could not form memories and did not remember the events that had just happened.

"We demonstrated that the mutant mouse has a severe memory deficit because of the lack of the kinase activity of CaMKII alpha. This finding supports the idea that the kinase activity of CaMKII alpha is essential to memory functions. Such a memory-deficit mutant mouse could serve as an animal model to study the molecular mechanisms of memory, and be a useful tool for the development and screening of therapeutic reagents for memory-deficit disorders. It may also help open a new therapeutic approach to memory dysfunctions in patients.", said Dr Yamagata.


Contact: Dr. Yoko Yamagata
National Institute for Physiological Sciences

Related medicine news :

1. Next Generation Waters - Nuu
2. Abbott Initiates Trial of Next-Generation XIENCE PRIME(TM) Drug Eluting Stent, Building Upon Superior Outcomes from SPIRIT Family of Trials
3. Abbott Announces Launch of Next-Generation Embolic Protection System
4. Purity Products Partners with Leading Vitamin D Expert to Create Next-Generation D3 Complex
5. San Francisco Symposium Provides Training for Communities Looking to Develop Arts Programs That Unite Generations
6. RainEarth Applies for Patent for Second Generation Blood Dialysis Equipment
7. Nonin Medical Introduces Next-Generation Regional Oximeter at Euroanaesthesia 2009
8. ZigBee Selected by Continua Health Alliance for Next Generation Guidelines
9. Compressus Delivers Imaging Productivity & Efficiency Improvements in Next Generation MEDxConnect(TM) Workflow Management Solution
10. First heart patients implanted with next-generation mechanical heart pump
11. AARP to Host Cross-Generational Life Festival in Chicago, June 5-6
Post Your Comments:
(Date:11/26/2015)... ... 26, 2015 , ... Somu Sivaramakrishnan announced today that he ... now offers travelers, value and care based Travel Services, including exclusive pricing on ... as, cabin upgrades and special amenities such as, shore excursions, discounted fares, travel ...
(Date:11/26/2015)... ... , ... PRMA Plastic Surgery is updating their record books yet again with ... flap breast reconstruction surgery! , “What an accomplishment for the PRMA team, says ... it’s an honor to have served all of these women.” , PRMA is one ...
(Date:11/26/2015)... Karnataka (PRWEB) , ... November ... ... innovative online platform for mental health and wellness consultation, has collaborated with ... to holistically address their reader’s queries on topics on mental and emotional ...
(Date:11/25/2015)... Indianapolis, IN (PRWEB) , ... November 25, 2015 ... ... clean water accessible for all, Water For Empowerment ™ attracts volunteers together ... on clean water by empowering women as key stakeholders in the process. The ...
(Date:11/25/2015)... ... November 25, 2015 , ... ... recognized once again for its stellar workplace culture with the company’s Cincinnati office ... , Medical Solutions’ Cincinnati office was named a finalist in Cincinnati Business Courier’s ...
Breaking Medicine News(10 mins):
(Date:11/26/2015)... 26, 2015 Research and Markets ( ) ... Pacemaker Market Outlook to 2019 - Rise in Cardiac Disorders ... report to their offering. Boston ... Boston scientific and others. --> ... Biotronik, Boston scientific and others. ...
(Date:11/26/2015)... November 26, 2015 ... the "2016 Future Horizons and Growth ... Testing Market: Supplier Shares, Country Segment Forecasts, ... their offering. --> ) ... "2016 Future Horizons and Growth Strategies in ...
(Date:11/26/2015)... November 26, 2015 ... "Self Administration of High Viscosity Drugs" report ... has announced the addition of the "Self ... their offering. --> Research and Markets ... the "Self Administration of High Viscosity Drugs" ...
Breaking Medicine Technology: