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Related Concept Videos

Malaria01:29

Malaria

Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...
Toxoplasmosis01:28

Toxoplasmosis

Toxoplasmosis, a zoonotic disease caused by the protozoan Toxoplasma gondii, poses significant public health challenges globally due to its high seroprevalence and varied clinical manifestations. As an obligate intracellular parasite, T. gondii can infect all warm-blooded vertebrates, but felids are its only definitive hosts, shedding unsporulated oocysts into the environment. Humans typically acquire the infection through ingestion of tissue cysts in undercooked meat or oocysts from...
Leishmaniasis01:30

Leishmaniasis

Leishmaniasis is a protozoal disease caused by species of the genus Leishmania and transmitted through the bite of infected female sandflies. The parasite exists in two principal morphological forms during its life cycle. A sandfly acquires intracellular amastigotes from an infected reservoir host, such as a dog. Within the sandfly, these forms differentiate into motile, flagellated promastigotes. During a subsequent blood meal, promastigotes are injected into the human host, where they...
American Trypanosomiasis01:22

American Trypanosomiasis

Chagas disease, or American trypanosomiasis, is a vector-borne parasitic infection caused by Trypanosoma cruzi, a flagellated protozoan (kinetoplastid) of the family Trypanosomatidae. The disease is endemic in Latin America, although cases are increasingly reported worldwide due to human migration. Transmission most commonly occurs when feces of infected triatomine bugs contaminate bite wounds or mucosal surfaces; additional routes include congenital, transfusional, transplant-related, and oral...
Infectious Diseases and Their Occurrence01:28

Infectious Diseases and Their Occurrence

Infectious diseases appear in populations through various transmission patterns, influenced by pathogen characteristics, population immunity, environmental conditions, and social behavior. Understanding these patterns is essential for effective public health surveillance and intervention. These categories—sporadic, outbreak, epidemic, pandemic, and endemic—help frame the nature and scope of disease events.Sporadic diseases occur irregularly and infrequently, without a predictable temporal or...
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Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...

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Related Experiment Video

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Application of I TASSER, trRosetta, UCSF Chimera, HADDOCK server, and HEX loria for De Novo and In Silico Design of Proteins
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Amyloid goes global.

Ilya Bezprozvanny1

  • 1Department of Physiology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA. Ilya.Bezprozvanny@UTSouthwestern.edu

Science Signaling
|March 26, 2009
PubMed
Summary

Alzheimer's disease (AD) brain plaques composed of beta-amyloid (Abeta) cause localized and global brain function changes. New research reveals Abeta plaque accumulation disrupts neuronal activity and astrocyte signaling, impacting brain networks.

Area of Science:

  • Neuroscience
  • Pathology
  • Biochemistry

Background:

  • Alzheimer's disease (AD) brains exhibit abundant beta-amyloid (Abeta) plaques.
  • The precise mechanisms by which Abeta induces neuronal pathology in AD remain unclear.

Purpose of the Study:

  • To investigate the impact of Abeta plaque accumulation on brain structure and function in AD mouse models.
  • To elucidate the localized and global effects of amyloid plaques on neuronal and astrocyte signaling.

Main Methods:

  • In vivo calcium (Ca2+) imaging in AD mouse models.
  • Array tomography to study brain structure and function.
  • Analysis of neuronal activity, synaptic density, and astrocyte Ca2+ signaling.

Main Results:

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  • Amyloid plaques induce both localized and global alterations in brain function.
  • Observed short-range changes in neuronal Ca2+ concentrations.
  • Detected medium-range changes in neuronal activity and synaptic density.
  • Identified long-range effects on astrocyte Ca2+ signaling and intracellular Ca2+ waves.

Conclusions:

  • Amyloid plaque accumulation significantly disrupts brain function in AD.
  • Findings suggest a complex interplay between Abeta, neuronal activity, and astrocyte networks in AD pathogenesis.
  • Results offer potential insights into synaptic and neuronal network dysfunction in Alzheimer's disease.