Description of Research Expertise

Area of Expertise:
stem cell biology, bone and cartilage metabolism, fracture healing, skeletal adipose tissue, meniscus injury and repair, osteoporosis, and osteoarthritis

Area of Special Interest:
The Qin lab studies the cellular and molecular basis for skeletal development, homeostasis, aging, and diseases. Osteoporosis and osteoarthritis are two common skeletal diseases that cause huge economic and social burdens to our society. We utilize cutting edge techniques, including single-cell transcriptome analysis, 3D fluorescent imaging, and genetically modified animal models, to identify mesenchymal stem and progenitor cells at various musculoskeletal sites and investigate the function of progenitors and their descendants under normal and disease conditions. In collaborating with a team of multidisciplinary scientists and clinicians, our ultimate goal is to translate the studies on fundamental mechanisms of skeletal cell function into future clinical applications.

Ongoing projects in our group include:
• Delineating mesenchymal stem and progenitor cells in bone marrow, periosteum, joint, and muscle. We apply advanced single-cell transcriptomics approach to identify stem cell and progenitor subpopulations responsible for skeletal tissue homeostasis and regeneration.
• Investigating a novel adipose cell type (MALP) in bone marrow and its multifaceted actions in regulating bone metabolism. Our recent work discovered a unique cell type that expresses adipocyte markers but contains no lipid droplets. As adipocyte precursors, they exist abundantly as pericytes and stromal cells that form a ubiquitous 3D network inside the bone marrow cavity to regulate bone formation, resorption, angiogenesis, and hematopoiesis.
• Understanding the mechanism of radiation-induced osteoporosis and delayed fracture healing. Focal radiotherapy for cancer patients is frequently associated with skeletal damage within the radiation field. Our research on focal radiation animal models reveals the mechanism of radiation damage on bone structure and fracture repair. More importantly, we have proposed new therapeutic interventions for radiation-induced bone loss.
• Targeting epidermal growth factor receptor (EGFR) signaling for osteoarthritis treatment. We are the first group to demonstrate that EGFR signaling is critical for maintaining the superficial layer of articular cartilage and preventing osteoarthritis initiation. In collaboration with bioengineers, we develop a nanoparticle-based drug delivery system that targets EGFR in joint cartilage for osteoarthritis therapy.
• Exploring the molecular pathways governing meniscus homeostasis and injury repair. Meniscus tears are the most common injury to the knee. Our research on mesenchymal progenitors in meniscus discovers the Hedgehog signaling as a novel therapeutic target for treating meniscus injury and preventing osteoarthritis. This finding shed light on designing an advanced bioengineering approach to improve healing of tears that are otherwise considered irreparable.

Rotation Projects
Please contact Dr. Ling Qin if you are interested in discussing a rotation project in the lab.

Qin’s lab is accepting applications from creative and motivated students and postdoc trainees who can empower the lab’s work through rigorous learning and dedication.

Selected Publications

Tang, S. #, Yao, L. #, Ruan, J., Kang, J., Cao, Y., Nie, X., Lan, W., Zhu, Z., Han, W., Liu, Y., Tian, J., Seale, P., Qin, L. *, Ding, C*. #: these authors contributed equally to this work. *: co-corresponding authors.: Single-cell atlas of human infrapatellar fat pad and synovium unravels mechanisms of osteoarthritis-induced joint pathology. Sci Transl Med. 16 : eadf4590,2024.

Chowdhury, P., Velalopoulou A., Verginadis, I., Morcos, G., Loo, P., Kim, M., Motlagh, S.Z.O., Shoniyozov, Kl, Diffenderfer, E., Ocampo, E., Putt, M., Assenmacher, C., Radaellli, E., Lu, J., Qin, L., Liu, H., Leli, N.M., Girdhani, S., Denef, N., Sappen, F., Cengel, K., Busch, T., Metz, J., Dong, L., Lin, A., and Koumenis, C.: Proton FLASH radiotherapy ameliorates radiation-induced salivary gland dysfunction and oral mucositis and increases survival in a mouse model of head and neck cancer. Mol. Cancer Ther. 23 : 877-889,2024.

Bandyopadhyay, S., Duffy, M., Ahn, K.J., Pang, M., Smith, D., Duncan, G., Sussman, J., Zhang, I., Huang, J., Lin, Y., Xiong, B., Imtiaz, T., Chen, C., Thadi, A., Chen, C., Xu, J., Reichart, M., Pillai, V., Snaith, O., Oldridge, D., Bhattacharyya, S., Maillard, I., Carroll, M., Nelson, C., Qin, L.*, and Tan, K*. *: co-corresponding authors.: Mapping the cellular biogeography of human bone marrow niches using single-cell transcriptomics and proteomic Imaging. Cell 187 : 3120-3140,2024.

Chen, K., Tian, Z., Wang, H., Qin, L., Enomoto-Iwamoto, M., and Zhang, Y.: Gene Expression Profiles Perturbed by Injury to the Mouse Intervertebral Disc. Am. J. Phys. Med. 104 : 45-50,2024.

Zhang, C., Zhong, L., Lau, Y.K., Wu, M., Schaer, T.P., Mauck, R.L., Malhotra, N.R., Qin, L. and Smith, L.J.: Single cell RNA sequencing reveals emergent Notochord-derived cell subpopulations in the postnatal nucleus pulposus. FASEB J. 38 : e23363,2024.

Collins, J.M., Lang, A., Parisi, C., Moharrer, Y., Nijsure, M.P., Kim, J.H., Szeto, G.L., Qin, L., Gottardi, R.L., Dyment, N.A., Nowlan, N.C., and Boerckel, J.D.: YAP and TAZ couple osteoblast precursor mobilization to angiogenesis and mechanoregulated bone development. Dev. Cell. 59 : 211-227,2024.

Li, J.#, Gui, T.#, Yao, L., Guo, H., Lin, Y., Lu, J., Fang, J., Duffy, M., Zgonis, M., Mauck, R., Dyment, N., Zhang, Y., Scanzello, C., Seale, P., and Qin, L. #: these authors contributed equally to this work.: Synovium and infrapatellar fat pad share common mesenchymal progenitors and undergo coordinated changes in osteoarthritis. J Bone Miner Res. 39 : 161-176,2024.

Tian, Z., Shofer F.S., Fan, M., Sandroni, A.Z., Yao, L., Han, L., Qin, L., Enomoto-Iwamoto, M., and Zhang, Y.: ADAM8 inactivation retards intervertebral disc degeneration in mice. Genes Dis. 11 : 101059,2024.

Bautista, C.A., Srikumar, A., Tichy, E.D., Qian, G., Jiang, J.X., Qin, L., Mourkioti, F., Dyment, N.A.: CD206+ tendon resident macrophages and their crosstalk with fibroblasts and the ECM during tendon growth and maturation. Front Physiol. 14 : 1122348,2023.

Dillard, L.J., Rosenow, W., Calabrese, G., Mesner, L.D., Al-Barghouthi, B.M., Abood, A., Farber, E.A., Onengut-Gumuscu, S., Tommasini, S.M., Horowitz, M.A., Rosen, C.J., Yao, L., Qin, L., and Farber, C.R.: Single-cell transcriptomics of bone marrow stromal cells in diversity outbred mice: a model for population-level scRNA-Seq studies. J Bone Miner Res. 38 : 1350-1363,2023.

Academic Contact Information

McKay Orthopaedic Research Laboratory
311A Stemmler Hall
3450 Hamilton Walk
Philadelphia, PA 19104
Phone: 215-898-6697