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System of Memory01:23

System of Memory

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Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
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Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
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Long-Term Memory01:18

Long-Term Memory

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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual...
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Repressed Memory01:16

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Repressed memories are a psychological phenomenon where memories of traumatic events are unconsciously blocked from a person's awareness. This process occurs as a defense mechanism, protecting the mind from the emotional impact of distressing or painful experiences. For example, a person who has experienced childhood trauma may grow up with no conscious recollection of the event. In such cases, the memories are thought to be buried deep within the subconscious, inaccessible to the conscious...
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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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Measuring Deformability and Red Cell Heterogeneity in Blood by Ektacytometry
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Heterogeneity of memory B cells.

Anita S Chong1,2, M Javeed Ansari1,2

  • 1Department of Surgery, Section of Transplantation, University of Chicago, Chicago, IL, USA.

American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons
|January 24, 2018
PubMed
Summary
This summary is machine-generated.

Highly sensitized transplant candidates may have undetectable donor-specific antibodies due to memory B cells. Quantifying these cells is crucial for understanding sensitization and detecting antibody-mediated rejection (AMR).

Keywords:
B cell biologyalloantibodybasic (laboratory) research/scienceeditorial/personal viewpointimmunobiologyplasma cellsrejection: antibody-mediated (ABMR)

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Area of Science:

  • Immunology
  • Transplant Science
  • Medical Research

Background:

  • Highly sensitized potential solid organ transplant recipients face long wait times, low transplant rates, and poor outcomes.
  • While new kidney allocation systems have improved access for highly sensitized individuals, their long-term outcomes remain unknown.
  • Emerging data indicate that memory B cell repertoires are broader than plasma cell repertoires, suggesting the presence of donor-specific HLA-specific memory B cells even without detectable donor-specific antibodies.

Purpose of the Study:

  • To highlight the potential presence of donor-specific HLA-specific memory B cells in highly sensitized transplant recipients.
  • To underscore the heterogeneity in memory B cell generation and differentiation, which may impact immunomodulation efficacy.
  • To propose the urgent need for quantifying donor-specific B cells in transplant recipients.

Main Methods:

  • Review of emerging data on B cell repertoire and differentiation.
  • Analysis of the implications of memory B cell heterogeneity in immune responses.
  • Conceptual proposal for a new diagnostic approach.

Main Results:

  • Memory B cells may harbor donor-specific HLA-specificities not detected by current antibody assays.
  • Heterogeneity in memory B cell generation and recall responses can influence transplant outcomes.
  • Current methods may underestimate the immunological risk in highly sensitized recipients.

Conclusions:

  • Quantifying donor-specific B cells is essential for understanding sensitization mechanisms and recall responses.
  • This quantification could enable early detection of acute and chronic antibody-mediated rejection (AMR).
  • Addressing memory B cell presence may improve long-term outcomes for highly sensitized transplant recipients.