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Related Concept Videos

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and...
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Gastric Motility01:16

Gastric Motility

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Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
Peristaltic Waves and Chyme Formation
Upon food entry, the stomach initiates...
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Gastrointestinal Motility Disorders01:20

Gastrointestinal Motility Disorders

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Gastrointestinal or GI motility disorders are characterized by irregular gastrointestinal tract movements, disrupting food transit from the mouth to the anus. They are caused by damage or dysfunction in gut muscles or nerves. These disorders can cause symptoms such as severe constipation, diarrhea, abdominal pain, and swallowing difficulties. Disorders can affect any segment of the GI tract and range widely in severity, from common conditions like GERD to life-threatening conditions like...
547
Physiology of the Gastrointestinal System I: Ingestion and Propulsion01:22

Physiology of the Gastrointestinal System I: Ingestion and Propulsion

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The physiology of the gastrointestinal system begins with ingestion as food enters the mouth.
621
Physiology of the Gastrointestinal System II: Digestion and Absorption01:22

Physiology of the Gastrointestinal System II: Digestion and Absorption

740
The gastrointestinal (GI) tract, extending from the mouth to the anus, plays a pivotal role in the digestion and absorption of nutrients. This process involves both mechanical and chemical actions facilitated by various enzymes.
Digestion begins in the mouth, where food undergoes mechanical breakdown by chewing and combines with saliva. Salivary amylase, an enzyme in saliva, starts the breakdown of starches into maltose. The food then travels down the esophagus to the stomach.
In the stomach, a...
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Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

344
Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
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Physins in digestive system neoplasms.

Lei Liu1, Xue Yao2, Yanrong Wang3

  • 1Medical Research Center, The Affiliated Hospital of Southwest Jiaotong University, The Third People's Hospital of Chengdu, The Second Chengdu Hospital Affiliated to Chongqing Medical University, Chengdu, Sichuan, China.

Advances in Clinical Chemistry
|November 25, 2022
PubMed
Summary
This summary is machine-generated.

Physin proteins, including synaptophysin (SYP), are vital for identifying neuroendocrine neoplasms (NENs) in the digestive system. Bloodstream SYP and serum SYPL1 show promise as biomarkers for diagnosing and predicting outcomes in digestive tract cancers.

Keywords:
Colorectal neoplasmsNeuroendocrine neoplasmsSynaptophysinSynaptophysin like 1Synaptophysin like 2Synaptoporin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • The physin protein family, comprising synaptophysin (SYP), synaptophysin like 1 (SYPL1), synaptophysin like 2 (SYPL2), and synaptoporin (SYNRP), are integral tetratransmembrane proteins involved in transport vesicle function.
  • SYP is a critical diagnostic marker for neuroendocrine neoplasms (NENs), particularly in the gastroenteropancreatic (GEP) NENs, essential for histopathologic identification.
  • Emerging research indicates that SYP found in the bloodstream, on platelets and circulating tumor cells, correlates with clinicopathologic features of GEP-NENs and may possess prognostic value.
  • Serum SYPL1 is also emerging as a potential biomarker for colorectal cancer, highlighting the broader clinical relevance of the physin family.

Purpose of the Study:

  • To provide a comprehensive overview of the physin protein family's structure and function.
  • To explore the diagnostic and prognostic potential of physin proteins in digestive tract neoplasms.
  • To discuss the therapeutic implications of targeting physin proteins for digestive system cancers.

Main Methods:

  • Literature review and synthesis of existing research on physin proteins.
  • Analysis of studies investigating SYP as a histopathologic marker for NENs.
  • Examination of research correlating bloodstream SYP and serum SYPL1 levels with GEP-NENs and colorectal cancer.

Main Results:

  • Synaptophysin (SYP) is established as a key marker for diagnosing NENs, especially in the gastrointestinal tract.
  • Circulating SYP levels in the bloodstream are associated with clinical characteristics and prognosis of GEP-NENs.
  • Serum SYPL1 shows potential as a biomarker for detecting and monitoring colorectal cancer.

Conclusions:

  • Physin proteins, particularly SYP and SYPL1, represent significant advancements in the diagnosis and prognosis of digestive tract neoplasms.
  • Further research into physin proteins could lead to novel diagnostic, prognostic, and therapeutic strategies for NENs and other digestive cancers.
  • The physin family's role extends beyond diagnostics, offering potential avenues for targeted cancer therapies.