Progress of research in cell-in-cell phenomena

Understanding how cells interact within multicellular organisms remains a central challenge in biology. While phagocytosis is well-characterized, nonphagocytotic interactions are less clear. Researchers have long noted cells inside other cells but struggled to define their function. This uncertainty has driven investigations into the mechanisms and roles of such interactions. Prior studies have identified three distinct forms of cell-in-cell events. These include cannibalism, emperipolesis, and entosis. Each of these phenomena involves one cell entering another but differs in structure and function. The lack of consensus on their biological relevance has limited progress in the field. This gap motivated a comprehensive review of the current knowledge.

This review aims to clarify the morphological and functional distinctions among three types of cell-in-cell phenomena. The authors sought to synthesize existing evidence on their mechanisms and roles. By comparing cannibalism, emperipolesis, and entosis, they aimed to highlight their unique features. The study focused on how these processes differ in cell recognition and penetration. The goal was to provide a framework for future research on their biological significance. The authors also aimed to identify unresolved questions in the field. Their approach involved analyzing published literature on morphology and function. This synthesis provides a foundation for further experimental studies.

The authors conducted a literature review to examine the three types of cell-in-cell phenomena. They analyzed published studies on cannibalism, emperipolesis, and entosis. The review focused on morphology, cell recognition, and penetration mechanisms. The authors compared cytological and biological differences among the three phenomena. No experimental data was collected; instead, they synthesized existing findings. The literature was selected based on relevance to morphology and function. The authors organized findings thematically, focusing on each phenomenon’s unique traits. This approach allowed them to identify patterns and gaps in current understanding.

The three types of cell-in-cell phenomena differ in morphology and function. Cannibalism involves one cell engulfing another for digestion. Emperipolesis is a transient interaction where a cell moves through another. Entosis is a process where one cell invades another for destruction. Each phenomenon has distinct cell recognition mechanisms. Cannibalism relies on specific signaling pathways for engulfment. Emperipolesis occurs without engulfment and is often temporary. Entosis involves active invasion and subsequent cell death. These findings suggest diverse biological roles for each phenomenon.

The authors synthesized evidence to clarify the distinct features of cell-in-cell phenomena. They emphasized the importance of distinguishing cannibalism, emperipolesis, and entosis. Each phenomenon has unique morphological and functional characteristics. The review highlights the need for further studies on their biological roles. The authors propose that these phenomena may play roles in development or disease. They suggest that future research should focus on their mechanisms and functions. The study does not claim these processes are essential but proposes they may be significant. The findings provide a foundation for future experimental investigations.