Biosketch / Results /

Michael Weiden

Associate Professor, Department of Medicine;Associate Professor, Department of Environmental Medicine

Contact Info

462 First Avenue
New York, NY 10016



— Resident, Internal Medicine, Presbyterian Hospital, New York (1985-87), Residency Training
— Fellow, Pulmonary and Critical Care, Presbyterian Hospital, New York, NY (1987-90), Clinical Fellowships
— SUNY Stony Brook, New York (1984), Medical Education
— Intern, Internal Medicine, Presbyterian Hospital, New York (1984-85), Internship

Research Summary

We have investigated the mechanism for the deterioration in immune status produced by tuberculosis in AIDS patients. We have observed that tuberculosis accelerates AIDS by enhancing viral replication and mutation in the lung. Tuberculosis also alters chemokine co-receptor expression on macrophages creating a permissive environment for production of pathogenic viral phenotypes. In the absence of inflammation, alveolar macrophages do not support HIV-1 replication. This suggests that without pneumonia, cellular factors actively inhibit viral replication in the lung. We searched for transcription factors that repress the HIV-1 LTR promoter in the absence of inflammation and found that alveolar macrophages normally express dominant negative transcription factors that represses the HIV-1 LTR. Production of these transcriptional repressors is a novel interferon response. Monocytes are unable to produce the repressors and so investigation of blood monocytes did not reveal this pathway that controls HIV-1 replication in the lung. Differentiation of monocytes to macrophages is required for production of the transcriptional repressors and antiviral effect of interferon or IL-10. During tuberculosis, expression of this repressor is lost. Lymphocyte/macrophage or PMN/macrophage contact is required for loss of the dominate-negative transcription factors. Signaling through both CD40 and CD80/86 is required for de-repression; this in combination proinflammatory cytokines or reactive oxygen intermediates are necessary and sufficient for the high level of HIV-1 replication observed during tuberculosis. De-repression of macrophages mediated through co-stimulatory molecule signaling is a novel mechanism of immune activation leading to enhanced HIV replication in the innate and cellular immune response.

Research Interests

Lung infection and inflammation

Research Documents

Chitotriosidase in the Pathogenesis of Inflammation, Interstitial Lung Diseases and COPD
Cho, Soo Jung; Weiden, Michael D; Lee, Chun Geun
2015-01-04; 2092-7355,Allergy, asthma & immunology research - id: 1420122, year: 2015 Journal Article; Review

The Duration of an Exposure Response Gradient between Incident Obstructive Airways Disease and Work at the World Trade Center Site: 2001-2011
Hall, Charles B; Liu, Xiaoxue; Zeig-Owens, Rachel; Webber, Mayris P; Aldrich, Thomas K; Weakley, Jessica; Schwartz, Theresa; Cohen, Hillel W; Glaser, Michelle S; Olivieri, Brianne L; Weiden, Michael D; Nolan, Anna; Kelly, Kerry J; Prezant, David J
2015-06-15; 2157-3999,PLoS currents - id: 1626532, year: 2015 Journal Article

Refractory sarcoid arthritis in world trade center-exposed new york city firefighters: a case series
Loupasakis, Konstantinos; Berman, Jessica; Jaber, Nadia; Zeig-Owens, Rachel; Webber, Mayris P; Glaser, Michelle S; Moir, William; Qayyum, Basit; Weiden, Michael D; Nolan, Anna; Aldrich, Thomas K; Kelly, Kerry J; Prezant, David J
2015-01-04; 1076-1608,Journal of clinical rheumatology. JCR - id: 1419602, year: 2015 Journal Article

Trends in sepsis and infection sources in the United States. A population-based study
Nolan, Anna; Weiden, Michael D
2015-05-13; 2325-6621,Annals of the American Thoracic Society - id: 1570262, year: 2015 Journal Article

Segal, Leopoldo N; Weiden, Michael D; Horowitz, Harold W
2015-07-29; , - id: 1686882, year: 2015