Myeloma cells show prominent vacuoles containing acid phosphatase (AP) activity, indicating autophagy. Treatment reduces vacuolation and AP scores, suggesting Bence Jones proteins may cause toxicity.

Area of Science:

Biochemistry
Cell Biology
Oncology

Background:

Multiple myeloma is a cancer of plasma cells.
Autophagy plays a role in cancer cell survival and drug resistance.

Observation:

Myeloma cells exhibited prominent intracellular vacuoles.
Acid phosphatase (AP) reaction product was localized within and around these vacuoles, suggesting autophagic activity.

Findings:

A high AP score (3.86) and 100% of cells showing positive staining were observed pre-treatment.
In remission, AP scores decreased to 1.32, with only 72% of cells positive, and reduced vacuolation.
Intracellular Bence Jones proteins are implicated as a potential cause of vacuolation and lysosomal enzyme activation.

Implications:

Autophagic vacuoles and AP activity may serve as biomarkers for myeloma progression and treatment response.
Understanding the role of Bence Jones proteins in cellular toxicity could lead to novel therapeutic strategies.

Synchrotrons And Accelerators

Accelerators

Vacuolated Plasma Cells In Multiple Myeloma