Related Experiment Video
Updated: Jul 9, 2026
08:04
A Mouse Model of Vascularized Heterotopic Spleen Transplantation for Studying Spleen Cell Biology and Transplant Immunity
Published on: June 11, 2019
Studies on splenic population size feedback control regulatory mechanisms
Clara M Ambrus1, Donald E Sykes, Mahmoudn N Kulaylat
1Department of Pediatrics, State University of New York at Buffalo School of Medicine and Biomedical Sciences, USA.
Journal of Medicine
|December 19, 2007
Summary
Splenic regeneration is regulated by feedback mechanisms. This study found that administering normal plasma did not inhibit splenosis, suggesting circulating regulators may not be the primary control in splenic growth.
Area of Science:
- Immunology
- Regenerative Medicine
- Surgical Pathology
Background:
- Splenosis, the ectopic splenic tissue, can occur after splenectomy or trauma.
- Previous studies showed increased splenosis in splenectomized animals compared to normal controls.
- The mechanisms regulating splenic growth and regeneration remain incompletely understood.
Purpose of the Study:
- To investigate the role of potential circulating regulatory mechanisms in controlling splenosis.
- To test the hypothesis that population size feedback controls splenic growth and regeneration.
Main Methods:
- Subcutaneous implantation of splenic fragments in rodents.
- Comparison of peritoneal splenic growth areas between splenectomized and normal animals.
- Administration of normal plasma to assess its effect on splenosis.
Main Results:
- Animals with subcutaneous splenic implants showed reduced peritoneal splenic growth compared to controls.
- Administration of normal plasma did not inhibit splenosis in the experimental models.
- Findings suggest that circulating factors may not be the primary regulators of splenic growth.
Conclusions:
- The results do not support the hypothesis of circulating population size feedback regulators inhibiting splenosis.
- Further research is needed to elucidate the precise mechanisms governing splenic regeneration and growth control.
More Related Videos
Related Concept Videos
01:18Positive and Negative Feedback Loops
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires maintaining an internal dynamic equilibrium:
01:17Autoregulation of Blood Flow
Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
01:01Regulation of Hematopoietic Stem Cells
All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
01:07Cell Signaling Feedback Loops
Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
01:26Feedback control systems
Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
01:01Feedback Loops
In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.