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Related Concept Videos

Respiration Pathways01:26

Respiration Pathways

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Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
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In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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How many pathways to pheochromocytoma?

Hartmut P H Neumann1, Stefan Hoegerle, Tanja Manz

  • 1Nephrology Section, Department of Medicine, Albert-Ludwigs University, Freiburg, Germany. neumann@mm41.ukl.uni-freiburg.de

Seminars in Nephrology
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Summary

Recent advances in understanding pheochromocytoma reveal genetic links to familial syndromes like MEN-2, VHL, and NF-1. Genetic screening and advanced diagnostics enable early detection and familial risk assessment for this rare tumor.

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Area of Science:

  • Endocrinology and Oncology
  • Molecular Genetics and Tumor Biology

Background:

  • Pheochromocytomas can arise sporadically or as part of hereditary cancer syndromes.
  • Familial pheochromocytoma is associated with Multiple Endocrine Neoplasia type 2 (MEN-2), von Hippel-Lindau (VHL) disease, and Neurofibromatosis-1 (NF-1).

Purpose of the Study:

  • To review recent clinical and molecular advancements in pheochromocytoma.
  • To highlight the role of genetic discoveries in diagnosis and management.

Main Methods:

  • Review of current clinical data and molecular mechanisms.
  • Integration of genetic findings with diagnostic modalities (biochemical and imaging).

Main Results:

  • Identification of tumor-suppressor genes implicated in familial pheochromocytoma and paraganglioma.
  • Development of sensitive and specific biochemical and imaging tests for disease detection.

Conclusions:

  • Genetic information facilitates early diagnosis of pheochromocytoma.
  • Genetic screening is now feasible for at-risk relatives, enabling proactive management.