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Mark Horowitz, PhD

Professor Emeritus of Orthopaedics & Rehabilitation, Senior Research Scientist

About

Titles

Professor Emeritus of Orthopaedics & Rehabilitation, Senior Research Scientist

Appointments

Other Departments & Organizations

Education & Training

PhD
SUNY Upstate Med Center (1977)
BS
Syracuse University, Biology/Biology (1972)
MS
Yale University
Fellow
Yale University School of Medicine

Research

Overview

The laboratory is focused on two areas. The first, is osteoimmunology and the second is the relationship of adipose tissue to bone. To this end we are examining a number of transgenic animal models many of which have specific transcription factors deleted, one result being bone alterations. As an example the loss of GATA-1, a transcription factor required for megakaryocyte differentiation, have a phenotype characterized by an increase in the number of megakaryocytes, no functional platelets and a massive increase in both trabecular and cortical bone. We are in the process of characterizing both the bone phenotype and the underlying mechanism responsible for the increased bone mass. In addition, we are looking at mice deficient in transcription factors required for B cell differentiation. Ebf1 deficient mice lack B cells but also have increased bone formation and increased marrow fat. Increased fat usually occurs at the expense of osteoblastogenesis. Because of the lipodystrophic phenotype of Ebf1 deficient mice, we are developing models for increased marrow fat. Marrow fat increases with age. However, is function as well as its origin are unknown. In a separate project, we are isolating cells from inside, rather than on bone surfaces. These cells are heterogeneous and have some characteristics of osteocytes.
  • Analysis of the bone and fat phenotype of mice lacking the B cell transcription factors Ebf1 and Pax5
  • Analysis of the bone phenotype of mice lacking GATA1
  • Isolation and characterization of bone cells from inside bone (osteocytes).
  • Develop mouse models for marrow fat.

Medical Subject Headings (MeSH)

Adipocytes; Bone and Bones; Bone Remodeling; Mesenchymal Stem Cell Transplantation; Orthopedics; Osteoblasts; Osteoclasts

Research at a Glance

Yale Co-Authors

Frequent collaborators of Mark Horowitz's published research.

Publications

2024

2008

2004

Academic Achievements & Community Involvement

  • activity

    NIH

  • honor

    Co-Director, Yale Core Center for Musculoskeletal Disorders

  • activity

    School of medicine

Get In Touch

Contacts

Academic Office Number
Mailing Address

Orthopaedics & Rehabilitation

P.O. Box 208071

New Haven, CT 06520-8071

United States