Journal Article

Malnutrition suppresses cell cycle progression of hematopoietic progenitor cells in mice via cyclin D1 down-regulation

Fock, Ricardo A., Crisma, Amanda R., Borelli, Primavera, Rogero, Marcelo M., Nakajima, Karina, Silva, Graziela B.

2014

Overview

Protein malnutrition (PM) often is associated with changes in bone marrow (BM) microenvironment leading to an impaired hematopoiesis; however, the mechanism involved is poorly understood. The aim of this study was to compare the cell cycle progression of hematopoietic stem cells (HSC) and hematopoietic progenitor cells (HPC) and evaluate the cell cycle signaling in malnourished mice to assess the mechanism of cell cycle arrest. C57Bl/6J mice were randomly assigned in control and malnourished groups receiving normoproteic and hypoproteic diets (12% and 2% protein, respectively) over a 5-wk period. Nutritional and hematologic parameters were assessed and BM immunophenotypic analysis was performed. Cell cycle of HPC (Lin–) and HSC (Lin–Sca-1+c-Kit+) were evaluated after 6 h of in vivo 5-bromo-2'-deoxyuridine (BrDU) incorporation. Cell cycle regulatory protein expression of HPC was assessed by Western blot. Malnourished mice showed lower levels of serum protein, albumin, glucose, insulin-like growth factor-1, insulin, and higher levels of serum corticosterone. PM also caused a reduction of BM myeloid compartment resulting in anemia and leukopenia. After 6 h of BrDU incorporation, malnourished mice showed G0-G1 arrest of HPC without changes of HSC proliferation kinetics. HPC of malnourished mice showed reduced expression of proteins that induce cell cycle (cyclin D1, cyclin E, pRb, PCNA, Cdc25a, Cdk2, and Cdk4) and increased expression of inhibitory proteins (p21 and p27) with no significant difference in p53 expression. PM suppressed cell cycle progression mainly of HPC. This occurred via cyclin D1 down-regulation and p21/p27 overexpression attesting that BM microenvironment commitment observed in PM is affecting cell interactions compromising cell proliferation.

• Publisher: Elsevier Inc,Elsevier,Elsevier Limited
• Subject: albumins / anemia / Animals / Biological and medical sciences / blood proteins / blood serum / Bone marrow / cdc25 Phosphatases - genetics / cdc25 Phosphatases - metabolism / Cell cycle / Cell Cycle Checkpoints - physiology / Cell Proliferation / Colleges & universities / corticosterone / Cyclin D1 / Cyclin D1 - genetics / Cyclin D1 - metabolism / Cyclin E - genetics / Cyclin E - metabolism / cyclin-dependent kinase / Cyclin-Dependent Kinase 2 - genetics / Cyclin-Dependent Kinase 2 - metabolism / Cyclin-Dependent Kinase 4 - genetics / Cyclin-Dependent Kinase 4 - metabolism / Cyclin-Dependent Kinase Inhibitor p21 - metabolism / Cyclin-Dependent Kinase Inhibitor p27 - genetics / Cyclin-Dependent Kinase Inhibitor p27 - metabolism / Cyclin-dependent kinases / cyclins / diet / Down-Regulation / Energy Intake / Feeding. Feeding behavior / Fundamental and applied biological sciences. Psychology / Gastroenterology and Hepatology / glucose / hematologic tests / hematopoiesis / Hematopoietic progenitor cells / Hematopoietic stem cells / Hematopoietic Stem Cells - cytology / Hematopoietic Stem Cells - metabolism / insulin / insulin-like growth factor I / Insulin-like growth factors / Kinases / kwashiorkor / leukopenia / Lymphocytes / Male / Malnutrition / Medical sciences / Metabolic diseases / Mice / Mice, Inbred C57BL / Nutrition / Nutritional Status / Other nutritional diseases (malnutrition, nutritional and vitamin deficiencies...) / Pharmaceutical sciences / Phosphorylation / proliferating cell nuclear antigen / protein content / protein synthesis / Protein-Energy Malnutrition - metabolism / Proteins / Rodents / Signal Transduction / Stem cells / Values / Vertebrates: anatomy and physiology, studies on body, several organs or systems