Comparison between primary lysosomes and secondary lysosomes

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

Let me share with you a comparison between primary lysosomes and secondary lysosomes.

AspectPrimary LysosomesSecondary Lysosomes
FormationFormed by the Golgi apparatusFormed by the fusion of primary lysosomes with endocytic vesicles or other cellular components
SizeRelatively smaller as compared to secondary lysosomesLarger and more mature compared to primary lysosomes
Enzymatic ActivityEnzymes are present but not yet activatedEnzymes are activated and functional for degradation
ContentContains hydrolytic enzymes (hydrolases) in an inactive stateContains activated hydrolytic enzymes for breaking down macromolecules
FunctionPrimarily involved in the synthesis and packaging of hydrolytic enzymesResponsible for the degradation of cellular material, including macromolecules and cellular organelles
pH LevelLess acidic as compared to secondary lysosomesMaintains an acidic pH for optimal enzymatic activity
Role in DegradationDoes not participate directly in cellular degradation until fused with other vesiclesActively involved in the breakdown of materials
Status in Healthy CellsPresent in a quiescent state until neededActively involved in ongoing cellular degradation processes